Changes in Intensity of Daily Surface Air Temperature Variations in Different Intramonthly Variability Ranges from Russian Meteorological Stations in 1970–2018

The variability of daily surface air temperature in Russia is investigated using meteorological station data for 1970–2018. Four variability ranges are analysed: intramonthly (<30 days), interdaily (<3 days), synoptic (4– 9 days), and the range of persistent weather regimes (10–30 days). Standard deviations are estimated for the reference (1970–1999) and modern (2000–2018) climatic periods for all seasons. During the modern period, the variability of average daily surface air temperature decreases (in general by 10–20%) while the average seasonal temperature increases. The largest variability decrease (33–37%) is found in spring and autumn to the Far East and the southeastern part of European Russia. In the European North of Russia in winter and autumn, average mean seasonal temperature increased by 4–5^oС. In winter, the largest decrease of temperature variability (18–23%) in all ranges is in central and north-western regions of the European Russia. The variability increase is revealed in the southern areas of Russia. In winter, the increase is the largest (16%) in the southern regions of Siberia in the range of persistent weather regimes. In other seasons, the increase of variability is found in the interdaily variability range in the European Russia in spring (20%) and autumn (17%), and the East Siberia in summer (14%). In general, there is a prevailing tendency towards a decrease of intramonthly surface air temperature variability in Russia for the last 50 years.

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