The climate in Moscow is temperately continental. There are neither sharp frosts nor excessive heats in Moscow, however deviations from the norm happen rather often. Sometimes in December there came long thaws. In summer, sharp colds and long rainfalls change the heat. The average temperature above zero keeps for 194 days a year, and the temperature below zero lasts for 103 days. The sun shines for 1568 hours per year.
The most important characteristic feature of the Moscow climate is the transparent atmosphere for the sun radiation, being a sign of pollution in the air. For the last forty-year period the transparence of the atmosphere in Moscow has become less for 3 percent.
For the same forty years the common cloudiness in Moscow has became 10% more. It is connected with both the increase of the repeatability of atmosphere circulation in the cold period of the year, and the influence of the city making for the growth of the consistence of moisture in the atmosphere.
During growing of the city the differences between the Moscow climate and the climate in the suburbs become more. In clean frosty nights out of the city sometimes there are for 4-5 degrees colder. For the last 80 years the average annual temperature has not changed in the outskirts of the city, and in the central part of the city it has grown.
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