The main weather and climate features of the northern hemisphere in October 2017
Air Temperature.
The first decade of October in the most part of Russia became an abnormally cold. At the beginning of the month the colds to -5°came to the south areas of Central Federal District (Lipetsk, Tambov, Orel, Belgorod and Voronezh regions). The same situation took place in the Low Volga area and in Stavropol district. Heavier colds were observed in the South Urals, in Yakutia frosts reached -20°. In some places of Ural, Siberia and Far East Federal districts it was colder than usual by 2° and more over the decade at the average.
Everything was changed in the second decade. Now from the west border to Urals, and in the Arctic territory up to Chukotka the warmth dominated. The average decade air temperature anomalies in some places exceeded +4…+6°. In the north of Yakutia, Kolyma, Chukotka and Arctic islands the new record air temperature maximums were registered. Only south areas of the Far East, as before, remained in the cold.
In the third decade once again the cold weather returned to the European Territory of Russia (ETR). In the north-west the decade became colder the norm by 2-3°. At the same time, it was, as before, warm behind Urals, including the south of the Far East. Although the frosts in Evenki and Yakutia were strengthened up to -30°, the average decade air temperatures exceeded the norms by 4-7°. In the south of Siberia and Khabarovsk district the air temperature daily maximums were registered.
The main weather and climate features of the northern hemisphere in September 2017
Air Temperature.
Abnormally cold weather, being dominated in August in Urals and West Siberia, became colder in the Autumn beginning. The territory, captured by colds, increased in the East Siberia and west areas of Yakutia, as well as in High and Middle Volga areas, east areas of Russian North and centre of Russia. It was news from these territories about frosts and new records of the air temperature minimums. In the third decade the temperature anomalies in the south of Urals and the West Siberia, as well as in the west of Yakutia reached -4…-5°. In Urals in XXI century only one September was colder than present one. It happened in 2014. In Siberia the cold September became the phenomena, which one can barely consider as the seldom event. In the recent decade the average monthly air temperature in September has been below the norm the third time. Such cold weather in the last September resulted in decreasing of the temperature below the norm in the area from Arkhangelsk region and the High Volga to Yakutia by 2° and more.
In the other part of European Territory of Russia (ETR) the temperature in the first decade wes close to the norm, but then the warmth began to increase, especially in the second part of the month in the south of ETR. In Crimea, Rostov and Volgograd regions, Krasnodar and Stavropol districts, in the North Caucasus the average daily air temperature many times reached the record values. In this area the average monthly air temperature anomalies exceeded +2…+3°.
In the most part of the Far East, particularly in the north areas, it was warmer than usual. The average monthly air temperature exceeded the norm by 2-3°. In Chukotka the records of maximum temperature have been registered, whereas in Sakhalin and in the south of the region temperature reached the record minimums in the beginning of the month.
In general, in Russia this September was close to the norm by temperature conditions, this is striking distinguishes it from September of the last year, which appeared to be the warmest in the country on the record, i.e. since 1891.