Climate

CLIMATE

There are five climates in Russia. The Polar climate hugs the Arctic coast and yields a 60-day growing season, with July and August averaging temperatures over freezing. Tundra vegetation prevails. South of the tundra, blanketing two-thirds of Russia, is the Subarctic climate with its brief cool summers and harsh cold, mostly dry, winters. With a growing season of sixty to ninety days, the dominant vegetation is taiga (northern coniferous forest), 90 percent of which is underlain by permafrost. In European Russia and Western Siberia, the Subarctic climate merges southward with the Humid Continental Warm-to-Cool Summer climate. Here the winters become less harsh, although much snowier, and the summers become longer and warmer. Growing seasons reach 90 to 120 days, and the vegetation is a temperate mixed forest that joins the broadleaf forests and grasslands to the south. Along the Lower Volga and in the North Caucasus, the climate becomes sub-humid. Here summers become equal to winters, a Semiarid Continental climate prevails, the growing season reaches 120 to 160 days, and grassland, or steppe, vegetation dominates. Particular to Russia's "bread-basket," a terrain with rich black loams, this climate suffers from insufficient precipitation. A tiny strip of Arid Continental climate fringes the Russian shoreline of the Caspian Sea. With hot, dry summers and rather cold, shorter winters, this climate yields a 160- to 200-day growing season. A true desert, it reflects a severe soil-moisture deficit.

Russia's massive landmass, northerly location, and flat-to-rolling terrain dramatically influence these climates. Because three-fourths of Russia is more than 250 miles (400 kilometers) away from a largely frozen sea, the climates are continental, not maritime. Continental climates exhibit wide ranges of temperature (the difference between the warmest and coldest monthly averages) and low average annual precipitation that peaks in summer instead of spring. Climatic harshness increases from west to east as the moderating influence of the warm North Atlantic Ocean decreases. St. Petersburg on the Gulf of Finland has a 45° F (25° C) difference between the July and January mean temperatures and 19 inches (48 centimeters) of annual precipitation. Yakutsk in Eastern Siberia contrasts with a 112° F (65° C) range of temperature and only 4 inches (10 centimeters) of precipitation.

Russia's high-latitude position enhances continentality. Nine-tenths of the country is north of 50° N Latitude. Moscow is in the latitude of Edmonton, Alberta; St. Petersburg equates with Anchorage, Alaska. Russia thus resembles Canada in climate more than it does the United States. High-latitude countries like Russia and Canada suffer low-angle (less-intense) sunlight and short growing

seasons that range from 60 days in the Arctic to 200 days along the Caspian shore.

Low relief also augments the negative effects on Russia's climates. Three-fourths of Russia's terrain lies at elevations lower than 1,500 feet (450 meters) above sea level. This further diminishes the opportunities for rain and snow because there is less friction to cause orographic lifting. The country's open western border, uninterrupted except for the low Ural Mountains, permits Atlantic winds and air masses to penetrate as far east as the Yenisey River. In winter, these air masses bring moderation and relatively heavy snow to many parts of the European lowlands and Western Siberia. Meanwhile, a semi-permanent high-pressure cell (the Asiatic Maximum) blankets Eastern Siberia and the Russian Far East. This huge high-pressure ridge forces the Atlantic air to flow northward into the Arctic and southward against the southern mountains. Consequently, little snow or wind affects the Siberian interior in winter. The exceptions are found along the east coast (Kamchatka, the Kurils, and Maritime province).

As the Eurasian continent heats faster in summer than the oceans, the pressure cells shift position: Low pressure dominates the continents and high pressure prevails over the oceans. Moist air masses flow onto the land, bringing summer thunderstorms. The heaviest rains come later in summer from west to east, often occurring in the harvest seasons in Western Siberia. In the Russian Far East, the summer monsoon yields more than 75 percent of the region's average annual precipitation. Pacific typhoons often harry Kamchatka, the Kurils, and Sakhalin Island.

Winter temperatures plunge from west to east. Along Moscow's 55th parallel, average January temperatures fall from a high of 22° F (–6° C) in Kaliningrad to 14° F (–10° C) in the capital to 7° F (–14° C) in Kazan to–6° F (–20° C) in Tomsk. Along the same latitude in the Russian Far East, the temperatures reach low averages of–29° F (–35° C). Northeast Siberia experiences the lowest average winter temperatures outside of Antarctica:–50° F (–45° C), with one-time minima of–90° F (–69° C).

In July, the averages cool with higher latitudes. Thus, the Caspian desert experiences averages of near 80° F (25° C), whereas the Arctic tundra records means of 40° F (5° C). Moscow averages 65° F (19°C) in July.

See also: geography

bibliography

Borisov, A. A. (1965). Climates of the USSR. Chicago: Aldine Publishing Co.

Lydolph, Paul E. (1977). Climates of the USSR: World Survey of Climatology. Amsterdam: Elsevier.

Mote, Victor L. (1994). An Industrial Atlas of the Soviet Successor States. Houston, TX: Industrial Information Resources.

Victor L. Mote