THE MAIN WEATHER AND CLIMATE FEATURES OF THE NORTHERN HEMISPHERE IN DECEMBER 2017
Air Temperature.
During all month the abnormally warm weather dominated in the European territory of Russia (ETR). At the end of the month the warmth was increased. In the first decade the average decade temperature anomalies reached +2…+3°, in the second and third one - +6…+8. The area of the large anomalies gradually enlarged. Record temperature maximums were registered in the Central region and Chernozem area, in the North Caucasus and Crimea, in Volga area and Pre-Urals. Temperature background corresponded to the beginning of spring, not to the winter month. Average monthly air temperatures exceeded the norms by 2-6° and more. In all federal districts, they came to the first ten of the highest values on the record, i.e. since 1891. In the South and Ural districts, it was the warmest December on the record, in the Central one – third, in the North Caucasian – fifth. In the north of ETR in the Kola Peninsula, although it was also warmer than usual, the temperatures were lower than -30°.
In the central and north areas of Siberia the warm weather, as well as in ETR, was kept for all month. The average decade temperature anomalies exceeded +10°. New daily maximums were registered. But the south of Siberia has got a frost in the middle of the month. In Altai republic the frosts reached -35°.
The Main Weather and Climate Features of the Northern Hemisphere in November 2017
Air Temperature.
In the first decade of November almost in all territory of the Russian Federation it was abnormally warm weather. In Urals and Siberia, the average decade air temperatures exceeded the norms by 5-9°, in the north of the Far East – by 6-10°. In the south of Siberia (south areas of Krasnoyarsk district, Kemerovo and Novosibirsk area, Altai district, republic of Altai) and in Chukotka the new maximum air temperature records were registered. Only in Yakutia and in the coast of Okhotsk sea it was colder than usual. Here frosts reached -40°.
In the second decade the warmth, being kept in the European territory (ETR) and Urals, also in the Arctic coast from Taimyr to Chukotka, succeeded the place to abnormal cold in Siberia and in most part of the Far East. In the ETR the average decade air temperature anomalies have set +3-4°, in the Urals - +4-6°, in the Arctic seas coast - +4-11°, in Siberia it was colder than usual by 2-5°, in the south of the Far East – by 2-3°. In the central areas of Siberia the frosts reached -45°, in the Far East the new record minimums were registered.
In the third decade, the cold penetrated to ETR, especially to the south regions, where it became colder than usual by 2-3°. Particularly, the colds became heavier in Siberia, in the west of Yakutia and the Far East. In Evenki it was close to -50°, in Yakutia even lower. The average decade temperature anomalies have set -5…-7°.