Air Temperature.
In the European territory of Russia, the beginning of autumn actually meant the summer continuation. In the first decade of the month, the air temperature maximums were registered in the Central and Central-Chernozem regions, in Crimea and in the north-west. The temperature were rising above 30°. The average decade anomalies in some places exceeded 5-6°. The same situation was observed in the north-east of the country. The summer warmth was kept here during the second decade. Once again, the maximum temperatures were registered in Chukotka and north-west of the European territory of the country. In the last decade the warmth, as before, dominated in the extreme north-east of Russia, whereas temperature conditions, close to autumn, came to ETR, and average temperatures of the third decade did not differ obviously from the norms, though exceeded them, as before. At this time, the new temperature maximums in Siberia and Yakutia replaced the cold weather beyond the Urals.
Altogether with this, the September frosts became not so seldom, as in August. They were registered not only beyond the Urals, which is usual for this time of the year, but in all European territory, including the south of Rostov and Volgograd areas, also in Primorye.
As a result of such monthly temperature distribution, the average September temperature value countrywide closed the first three highest values on the record, conceded two upper lines of 2016 and 2005 respectively. In the north of Far East federal district it was second warmest September (the first one is September 2003). In the Central federal district, it is the warmest one over the last 80 years. Its average temperature is close to the record values and is situated in the 4th line of the range row since 1891. In September 2018 in all European territory, Urals, along the Arctic coast and Chukotka the average monthly air temperature exceeded the norm by 2-4° and more. Except some areas in the north of Primorye, Sakhalin, Yakutia and south Siberian areas along the Kazakhstan border, the average monthly air temperature is above the norm everywhere.

Air Temperature.

The last summer month continued to please the European Russians with the warm, and sometimes hot weather. In every of three month decades the average monthly air temperature exceeded the norm by 2-4°. During the month, the temperature rose repeatedly above +30°. The new temperature maximums were registered. At the end of the month, when the sun were noticeably lower in the sky, than in the middle of the summer, and the air must have been cooler, but this did not happen. It became to heat even more, especially in the south. However, the first breath of the autumn was sensed by the Central Russia and Upper Volga inhabitants. In the middle of the second and beginning of the third decade in Volga-Vyatka region, Bashkortostan republic, Smolensk, Tula, Moscow areas the first frosts were registered.
Another situation was observed beyond the Urals. In the first decade in Siberia and Far East, the air was cooled substantially than usual. The average decade temperature in some places became by 2-4° below the norm. The daily minimums were registered from Turukhansk in the north to Novosibirsk in the south and Chukotka in the east. Then the cold retreated and all region, especially in Siberia found itself in the abnormally warm weather, which caused the exceeding of air temperature norms by 2-6° in the second and third decades. In Krasnoyarsk district and along the Arctic coast the new temperature maximums were registered.
As a result, in the most part of Russia the average August air temperature exceeded the norm. In the European territory, in the south of East Siberia, in Transbaikalia, Taimyr and the north of Yakutia – by 2-3°. It was slightly cooler in the south-east of the Ural and south-west of Siberia federal districts, also in Sakhalin, Kuril islands and Kamchatka. The average monthly air temperature, averaged by all Russia territory, has got 6-8 range among the highest values on the record.