The Ukrainian Climate

The Ukrainian Climate

The great uniformity of Eastern Europe, in respect to its morphology, we find repeated in its climatic conditions. But, to the same extent that the attentive investigator, upon close observation, finds several independent mor- phological individualities within the Eastern European low country, he will also observe important climatic differences in this great half-continent.

The Central European climatic zone stops at the western borders of the Ukraine. Similarly, the cool Eastern European continental climate, which rules over all of White and Great Russia, embraces only insignificant borderlands in the north of Ukrainian territory. The Ukrainian climate assumes an entirely independent posi- tion. It is more continental than that of Central Europe and differs from that of Great Russia in its greater mildness. The Ukraine shares with France the advantage that in its territory the direct transition from the temperate climate of Eastern Europe to the Mediterranean climate of Southern Europe takes place.

The thermal conditions of the Ukraine, despite its great size, are very uniform. The yearly averages fluctuate between +6° and +9° C. Ternopil, in Podolia, and Vov- chansk, in the Kharkov country, have the same yearly temperature of +6.3°, Pinsk +6.7°, Kiev and Kharkiv +6.8°, Lviv (Lemberg) and Poltava +6.9°. The differences are confined within a space of 1° C. Chernivtzi (Czernowitz) in the Bukowina, Yelisavet in the Kherson region, and Luhan in the Donetz region have an annual temperature of 7.6° or 7.7°, Katerinoslav on the Dnieper, Tahanroh on the Sea of Azof, and Stavropil in the sub-Caucasus country 8.3° or 8.2°. This great coincidence of yearly averages in so widely separated places is all the more surprising, since the mean temperature falls considerably directly behind the borders of the Ukraine. Thus, Kursk has only +5.2°, Voroniz +5.4°.

Not until we reach the southern borders of the Ukraine does the mean temperature rise considerably. Odessa and Kishinivhave +9.8°, Mikolaiv +9.7°,Simferopil +10.1°, Sevastopil +12.2°, Katerinodar +12.1°, Novorossiysk +12°, Yalta +13.4° mean annual temperature. The last-named place actually lies in the narrow belt of the Mediterranean climate, on the southern slope of the Yaila Mountains.

Comparing the annual averages of the Ukraine with those of different places in Western and Central Europe, the latter appear relatively much higher. London, situated in the same geographical latitude as Kursk has an annual temperature almost twice as high (+10.3°). London is on the average even a little warmer than Sim- feropil, which actually lies 650 km. nearer the equator. Brussels lies a little more north than Kiev, yet it is in the mean warmer than Odessa.

The cause of this unfavorable relation is the severe winter of the Ukraine. The mean temperature of January is +3.5° in London, +2° in Brussels, +1.2° in Frankfort a m., — 1.2° in Prague, — 3.3° in Cracow. In the Ukraine the January means are much lower. Lemberg has — 4.6°, Kiev has —6.2°, Kharkiv —8.3°, Luhan —8°, Vovchansk — 7.7°, Katerinoslav — 7.4°, etc. To be sure this is not re- markable when compared with the January temperatures of even the south of Great Russia, where the winter suggests polar conditions, but the antithesis to the winter climate of Western and Central Europe is striking. Hammerfest, the northernmost city of the. earth, is one degree warmer than Kiev in January and even a little warmer than Lemberg.

On the other hand, the summer of the Ukraine is even warmer than that of Western and Central Europe. The July mean of London is +17.9° C.,of Brussels 18°, Lemberg the same, but Kiev has as much as 19.2°, Kharkiv 20.9°. The differences in the summer temperatures are much smaller, however, than the differences in the winter tem- peratures — hence the comparatively low annual mean in the Ukraine.

These figures clearly show the continental character of the Ukrainian climate. The influences of the Atlantic Ocean, which still strongly dominate the climate of Central Europe, become slight in the Ukraine. Particularly, the southern part of the Ukraine is almost unaffected by the mitigating influence of a nearby ocean, and the necessary result is the low winter-temperatures. But the continental character of the Ukrainian climate is, nevertheless, not so strongly marked as that of the Russian or Siberian climate. Kamishin, Semipalatinsk, Blagovieshchensk, situated on the same degree of latitude as Kiev, have a January mean of —11.6°, 17.5° and —25.4°, and a July mean of +24.1°, +22.2° and +21.3°, respectively. The influences of the Black Sea, altho in general not great, are at least unmis- takable in the coastal region of the Ukraine.

The difference between the mean of the coldest and that of the warmest month is slighter in the Ukraine than in Russia or Siberia, to be sure, but it is, at any rate, considerable. Only in the Mediterranean climate of Southern Crimea does the difference amount to as little as 20°. The rest of Crimea, the sub-Caucasian country and the northwestern part of the Ukraine as far as Kiev and Uman have a difference of 20° — 25°, Lemberg, for example, 22.6°, Pinsk 24°, Chernivtzi 25.1°, Kiev 25.2°. On the other hand, the southern and the entire eastern part of the Ukraine, especially east of the Dnieper, shows a considerable difference, from 25° to 30°, as for example, Kiev 25.4°, Odessa and Mikolaiv 26.3°, Poltava 27.3°, Kharkiv and Tahanroh over 29°, Luhan and Katerinoslav 30.4°.

The winter appears severe in the entire Ukraine, with the exception of Crimea and the sub-Caucasian country.

The January mean temperature of — 4° to — 8° then obtains in the entire wide territory. Lemberg has — 4.3°, Tarnopol — 5.5°, Chernivtzi — 5.1°, Kiev — 6.2°, Vovchansk — 7.7°, Katerinoslav — 7.4°, Mikolaiv — 4.3°, Tahanroh — 6.7°, Luhan — 8°. Even the southern lands of the Ukraine have a low mean for January, for example, Odessa — 3.7° (Kishiniv — 3.5°), while Kamenetz owes its exceptionally high mean, — 3.3°, to its sheltered location in a "yar." The January isotherms run from northwest to southeast in Ukrainian territory, in a wide curve, which becomes increasingly flat toward the southeast. For this reason the cold in the Ukraine grows in intensity not in a northern but in a northeastern direction. The mean annual mini- mum almost everywhere exceeds — 20° (Lemberg — 19.2°, Chernivtzi —2 1.1°, Tarnopol —23.4°, Kiev —23.2°, Mikolaiv — 21.4°, Luhan — 28.4°). The absolute extremes attain very high values. The absolute minimum amounts to —30° in Mikolaiv and Odessa, —33.1° in Kiev, —34° in Ternopil, — 35° in Lemberg and Czernowitz, — 40.8° in Luhan.

The Ukrainian winter is far less variable than the Central European or even the Russian. Only in the north- western borderlands of the Ukraine does a thaw, brought by the Atlantic winds, frequently appear. The duration of the frost on the Pontian shore is at most two months, in the Pontian steppe-plain and the southern spurs of the plateau groups three months, in all the rest of the Ukraine three and a half. Only in the northeastern borderlands of the Ukraine, located on the spurs of the Central Russian elevation and the Donetz, does the frost period extend over four months.

In Southern Ukraine the winter is followed directly by a sunny spring, with dry east winds, which partly degenerate into sand-storms (sukhovi). Everywhere else in the Ukraine wet, sloppy weather follows the steps of the receding winter. Toward the northwest it continues longer and longer. The sloppy weather of spring consists of a con- stantly varying succession of frost, thaw, snowstorm, rain and sunshine, ending in the southern part of the Ukraine usually in the middle of April, in the northern and north- western part at the end of April or even at the beginning of May. The actual spring following thereon is very short thruout the Ukraine and usually lasts three weeks, except in the northwest, where it continues thru the entire month of May. The mean April temperature is everywhere higher than the annual mean (Lemberg +7.8°, Tarnopol and Kiev +6.9°, Czernowitz and Odessa +8.6°, Luhan — 8.1°). But the month of May is quite as warm as July in England. On the other hand, we find' May frosts in the entire Ukraine as far as the shores of the Black Sea, altho they do not appear so destructive here as in Russia proper.

The Ukrainian summer is everywhere marked by considerable heat. Only in the northwest corner of the Ukraine (Rostoche, Pidlassye, Polissye, Volhynia) is the summer moderately warm (Lemberg +19.1°, Ternopil + 18.7°, Pinsk +18°).

The July temperature of all the rest of the Ukraine is much higher than this. The July isotherm of +20°, like all the July isotherms of the Ukraine, runs in a northeast direction past the source of the Sbruch and the mouth of the Pripet, and the further we advance from this line towards the southeast, the hotter the summers we find.

On the lower Dniester and Dnieper the mean July tem- perature exceeds -(-23°. Following are a number of July means: Czernowitz -)-20.1°, Kiev -{-19.2°, Vovchansk +20.3°, Odessa +22.6°, Katerinoslav and Mikolaiv +23°, Luhan -(-22.4°, Tahanroh -(-22.8°. The strongest degrees of heat are +37° to +43°, and the mean annual maxima are +30.3° for Ternopil, +31.1° for Lemberg, +32.7° for Czernowitz, +32.1° for Kiev, +35.2° for Mikolaiv, +35.5° for Luhan. The duration of the heat period with temper- atures of +20° and over is two months southeast of a line which runs near Kishiniv, Poltava and Kharkiv, one month southeast of the line of Mohiliv, Kaniv and Kursk. The total duration of the summer is only in the northwest of the Ukraine as short as three months; otherwise it is four, and on the Black Sea even four and a half.

The autumn of the Ukraine is regularly very beautiful and comparatively warm. The month of October has a mean of temperature higher than the annual (Lemberg +8.5°, Ternopil +7.7°, Czernowitz +9°, Kiev +7.5°, Vovchansk +7°, Katerinoslav +9.7°, Luhan +8.4°, Odessa + 11°, Mikolaiv +9.7°, Tahanroh +9.1°). But even in October the warm sunny days are followed by night frosts. The moist autumnal weather which begins the transition to winter lasts as much as two months in the northwest; beyond that, one to one and a half months. The mean date of the earliest frost is October 19th for Kiev, Octo- ber 11th for Luhan, October 28th for Micolaiv, and November 10th for Odessa.

A different position, climatically, is that of Crimea, the sub-Caucasian country, as well as the mountain islands of the Carpathians, the Yaila and the Caucasus. In the temperature conditions of Crimea and the sub-Caucasus country, the influence of their southerly location and the proximity of the sea is everywhere apparent. The mean temperature is everywhere higher than +10° (Simferopol + 10.1°, Sevastopol +12. 2°, Katerinodar +12.1°). The winter is short and comparatively mild (January mean of Simferopol +0.8°, Sevastopol +1.8°, Katerinodar +2.1°, Stavropol — 4.7°), but very variable. The degrees of frost are sometimes quite high (Sevastopol — 16.9°, Stavropol — 25.6° as absolute minima), but the frost period is short (one to two months). The spring begins in March with full force; in May follows the five-months' summer. The July means are very high, especially in the sub-Caucasus country, the heat period lasting everywhere more than two months. (July mean of Simferopol -f- 28°, Sevastopol 33.1°, Stavropol +20°, Katerinodar +25.3°). The long autumn also is very mild.

South of the Yaila and Caucasus Mountains, on the shore of the Black Sea, lies a narrow strip of land which actually shows Mediterranean climatic characteristics. The winter lasts less than a month and is very mild (Jan- uary mean of Yalta +3.5°, altho the absolute minimum is — 13°), and, as in Novorossiysk, cold, bora-like gusts of wind are common in times of heavy cold. After a long spring follows a six-months' summer, which passes imperceptibly into a mild autumn.

The climate of the mountains of the Ukraine has been but little investigated. In the entire Ukrainian territory there is not a single meteorological observatory. The general characteristics of mountain climate, its greater uniformity, the smaller difference between the warmest and coldest months, the belated beginning of all the seasons, etc., may be found in all the mountains of the Ukraine.

Only the climate of the Ukrainian Carpathians is somewhat better known. The dreariest climate is that of the Beskyds and the Gorgani. The five-months' winter and long periods of sloppy weather in the spring and in the fall encroach upon the short summer. The Chornohora chain, despite the greater height of its peaks, upon which the snow in sheltered places remains lying thru the entire summer, has a much milder and pleasanter climate. The influence of the warm summer of the adjacent plain regions limits the duration of the sloppy weather in spring and autumn. For this reason, the mountain valleys have a short but very beautiful spring, a warm summer, and a wonderful mild autumn. The mountain pastures have in place of the summer only a three months' spring.

In the Yaila Mountains, as a result of their small size and height, the characteristics of typical mountain climate are lacking, but in the Caucasus we find them in their highest development. The analogy to the Alps is perfect, but the influence of the continental steppe climate of the surrounding country is unmistakable, expressing itself in the position of the various climatic regions, in the height of the snow limit, in the development of the glacial covering, etc., very distinctly and very differently than in the Alps, which are surrounded by countries with a climate of a different kind.

We now come to the second group of climatic phenomena, pressure and wind conditions. The Ukraine may, in this respect, be divided into two great regions. The line of high pressure which separates these parts, called by Voiekoff the great axis of Europe, extends from the bend of the Volga, near Tsaritsin, over the porohi section of the Dnieper at Katerinoslav to Kishinev. North of this line, west winds prevail, bringing Atlantic air into Northern Ukraine. In the south, east winds prevail, bearing the influences of the Asiatic steppe climate. This wind divide is most distinct in winter. In the northern part of the Ukraine we find chiefly west and southwest winds, which mitigate the frosts and cause precipitations of rainfall; in the southern part dry, cold east winds prevail, increasing the cold. Sometimes the east wind increases to a snow- storm (metelitzia, fuga) which whirls up terrible masses of snow, filling the air with snowflakes until absolutely nothing can be seen, and causes terrific destruction. Herds of a thousand head fall victim to its icy breath, even in the steppes of Crimea, and woe to the traveler who is caught in a snowstorm in the steppe.

In November and December, in Southern Ukraine, moist, warm south winds frequently come up from the Pontus. But the absolute balance is on the side of the freezing east winds, to which is to be ascribed the severe winter climate of Southern Ukraine. The northern half of the Ukraine as a rule, is seldom reached by the east winds, the northwestern corner very seldom. Their occasional appearance is accompanied by heavy frosts with fair weather.

In the spring, east and south winds blow, especially over Southern Ukraine. They often change to heavy sand-storms (sukhovi) very harmful to the crops, which carry clouds of sand, with which they form miniature dunes as high as 30 cm. The east and south winds, at such times, penetrate even into Northern Ukraine, altho with the exception of the northwest corner.

In the summer, on the other hand, the west, northwest, and southwest winds hold a decided balance over the east winds, even in Southern Ukraine. They bring moist Atlantic air and rain into the entire land and mitigate the heat. The occasional east winds increase the heat and bring periods of drought, but usually not until August, when they are rather frequent. In September all the winds are weak thruout the Ukraine, with high pressure. That is why the fall is so beautiful too. Then, in October and November, follows the gradual transition to the winter wind conditions.

The third group of atmospheric phenomena, humidity and precipitation, possesses the same great uniformity in Ukrainian territory as the other two elements of the climate. The humidity of the air in the Ukraine is in general slight. It is greatest in the forest-covered partly swampy West and Northwest. Toward the southeast the humidity in the Ukraine constantly decreases. Fogs appear seldom and are only light, so that the antithesis to Western and Central Europe, as well as Russia, is striking. The light night and morning fogs which appear, especially in the latter part of summer and in the fall, only contribute to the beautification of the landscape, by flooding the depressions of land like a sea. Cloud-formation is much slighter in the Ukraine than in Western or Central Europe, or in Russia proper, the dreary Muscovite country. The greatest number of clouded days occurs in the western and northwestern part of the Ukraine; toward the southeast and east the number of such days dwindles continuously. The least amount of cloudy weather occurs in the month of August. In September and October the increase is very slight. November and December are much cloudier and January is most cloudy all over the Ukraine. After that the cloudy weather lessens considerably at first, then slowly, until August.

The atmospheric precipitations in the Ukraine are in general insignificant, except in the Carpathian and Caucasus regions. The Ukraine has less rainfall than Central or Western Europe. The Atlantic Ocean, the most important source of the precipitations in Europe, lies far distant, and the cyclonal systems on their way east drop their collected moisture upon Western and Central Europe. For the Ukraine, and particularly for the eastern part of it, there is, therefore, very little left. In this connection the Black Sea has only a local significance, and the evaporation of water from the rivers, lakes and swamps, from the plants and the ground, is hardly worth considering, except as it happens in the summer.

The great amounts of precipitation are to be found in the mountains of the Ukraine, where rising currents of air help along the condensation of the water vapor. Even in the Low Beskid the precipitation exceeds 1000 mm. (Yasliska 1170 mm.), in the Gorgani and Chornohora we find in large areas, especially on the southern slope, a precipitation of over 1200 mm., in a few places 1400 mm. (Kobiletzka Polana 1377 mm., Bradula 1419 mm.). The amount of precipitation is still large in the entire Pidhirye, but at only a short distance it decreases considerably. Lemberg has only 735 mm. of rainfall, the southern part of the Rostoche as much as 900 mm. in places, since the western edges act like chains of mountains to the west winds. But Czernowitz, near as it is, has only 619 mm. and the Podolia on the Dniester still less. The Khotin lying in the yar of this river has only 300 mm., which best illustrates the significance of local conditions. At a greater distance from the curve of the Carpathians the amount of precipitation shows a slow but regular decrease toward the southeast. Only in the northern part of the Rostoche and the northwestern part of Podolia does the amount of precipitation attain 600 mm., while further toward the south and east a wide zone stretches out with only 500 — 600 mm. (Pinsk 581 mm., Kiev 534 mm., Uman 546 mm., Poltava 532 mm.). Another wide zone, which extends from the mouth of the Dniester to the bend of the Don, has a precipitation of between 400 and 500 mm. (Kharkiv 465 mm., Katerinoslav 475 mm., Kishinev 471 mm., Yelisavet 444 mm., Odessa 408 mm.). The next narrow zone of the Pontian and Crimean steppe has a precipitation of less than 400 mm. (Mikolaiv 360 mm., Sevastopol 386 mm., Luhan 379 mm.), a corner of Crimea on the peninsula of Tarkhankut has even barely more than 200 mm.

The Yaila Mountain Range is too small to have any marked influence on the increase in the amount of precipi- tation. Yalta has only 508 mm. precipitation. On the other hand, the influence of the Caucasus is very great. The sub-Caucasus Kuban region, to be sure, has only 400 — 500 mm . precipitation , Stavropol 7 20 mm . , N ovorossy sk 691 mm. However, the amount of precipitation on the southwestern side of the Caucasus Mountains increases uncommonly. At the borders of Ukrainian territory, Sochi has not less than 2071 mm.

From this account we see clearly enough that, in com- parison with Central and Western Europe, the Ukraine is rather poor in rainfall, especially in the southeast. But the distribution of the precipitations among the seasons is so favorable that most of them fall at the time they are most needed, namely, in the early part of summer. The entire Ukraine lies within the area of the summer rains, only the narrow strip of the south coast of Crimea and the Caucasus are within the area of the winter rains.

The reason of the preponderance of the summer rains lies in the western and northwestern Atlantic winds, which, in that season, have easy access far into the southeastern part of the Ukraine. These winds bring so much moisture into the Ukraine that almost two-thirds of the annual rain- fall belongs to May, June and July. The month with the greatest amount of precipitation for the entire Ukraine is June. Only the Polissye, Northwestern Volhynia and the western part of the Kiev territory show the heaviest precipitation in July, since, in these regions of forests and swamps, evaporation is heaviest at this time of greatest heat.

The summer rains of the Ukraine differ from those of Central or Western Europe in their heaviness. Only in the Western Ukraine are the summer rains of the type of gentle rains that are uniform for an entire country; in the south and east they appear as cloudbursts in heavy showers. In Samashcani, in Bessarabia, there have been times when 200 mm. of rain fell in a single day, in Korovintzi in the Poltava region, 5 mm. in one minute. In the Pontian steppes all rain falls in the form of heavy showers. The water flows off quickly and evaporates rapidly, before it is able to thoroughly saturate the ground..

Electric discharges and hailstorms occur in close connection with the summer rains, most frequently in June, less so in July and in May. They usually come from the southwest in the afternoon hours. Most of these storms originate in the Carpathian Mountains and reach Volhynia and Kiev, but do not cross the Dnieper. The Caucasus, too, has very many storms. Hailstorms are most frequent in Galicia and Volhynia and the western part of the Kiev regions; very rare in the southeast.

In August the amount of rainfall slowly decreases; in September and October still more, and so it continues until December. January is the month of least rainfall for the entire Ukraine (only one-fourth of the June figure), and this circumstance is of particularly great significance for the southern and eastern parts of the Ukraine. For this reason the cover of snow in the Ukraine is much less than in Central Europe or Muscovy, besides which, it is often disturbed by snowstorms. The slight snow-cover melts down quickly in the spring, without saturating the soil well, and without requiring much warmth. This explains the rapid rise of heat in the Ukrainian spring.

From January until the end of April the amount of rainfall again grows slowly but steadily, reaching its maximum in June.

The southern part of Crimea and the Caucasian shore have just the opposite annual distribution of the precipita- tions. Under the influence of the moist Pontian winds, the greatest amount of rain falls in December and January, while the spring and summer have very little rain. These characteristics of the Mediterranean climate, the rainy winter after the dry summer, are all the more striking, since the opposite condition prevails on the other side of the Yaila and Caucasus Mountains.

From this account of the Ukrainian climate we see that this climate retains an entirely independent position as against that of Central Europe or Russia. The Ukrainian climate is characterized by an annual amplitude of 20° to 30°, a mean annual temperature of from +6° to +12°, a July mean of from +19° to +24°, and a January mean of from 0° to 8°, with predominant summer rains and a generally insignificant cover of snow. The difference from the Russian climate is, consequently, quite consider- able. The Russian climate forms the transition to the polar, that of the Ukraine to the Mediterranean climate.

Nature has provided the Ukraine with a pleasant, very wholesome climate. On the whole temperate, it does not lack heavy frosts and considerable degrees of heat, which harden the Ukrainian to any inclemencies of the weather. The differences of the seasons cause a pleasant variety, strong winds clear the atmosphere and bring motion into nature, the rains are everywhere sufficient for the growth of vegetation and the carrying on of the most important occupation of the Ukraine — agriculture. The great uniformity of this Ukrainian climate has recently caused the French geographer, de Martonne, to set it up as one of the types of climate of the globe.