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.
The main weather and climate features of the northern hemisphere in August 2017
Air Temperature.
In August the European Territory of Russia kept an abnormally warm weather and sometimes hot one. From Russian North to Northern Caucasus the numerous records of the air temperature maximums have been registered. In South and North-Caucasian Federal Districts temperature repeatedly rose above +40°, in North-West District - +30°, in the last case it is rather seldom at the end of summer. Sometimes a cold Arctic air penetrated to the northern areas and then in Komi republic and Nenets Autonomous region the light frosts and temperature minimums were registered. The average decade air temperature anomalies in ETR exceeded +6°, in some places the average monthly air temperature are above the norm by 3-4°.
In the Urals and West Siberia the most part of the month it was cold weather with the average decade temperature anomalies -3°. In the south of West Siberia in Tyumen, Omsk, Tomsk, Novosibirsk, Kemerovo regions and Altai district the light frosts and new daily temperature minimums were registered.
Northern areas of Far East Federal district all month “bathed” in warmth. In Yakutia and Chukotka the air temperature maximums, as well as absolute ones on the record in August, have been registered. Average decade temperatures were exceeded by 4-5°, and average monthly air temperature became the third highest value on the record, it followed 2014 and 1991. August became warmer than July, it was happened only the third time, in XXI century – for the first time. In the south of Far East the abnormally warm weather of the first half of the month was changed by the fresh and even the cold one in the third decade of the month.