Beyond the Caucasus, the freezing Russian plains bring very cold air in the winters which can reach as far as the coast. The sea air, however, regulates much of the temperature and there are only 10 snowfall days a year in Georgia in the lowlands. Autumn brings frequent rain to the southern coast, with Batumi receiving around 13 rainy days a month in November and 300 millimeters of precipitation. Tbilisi remains relatively mild in winter, averaging between 2 and 8 degrees Celsius during the day from December to February. The mountainous regions feature much more frosty temperatures with frequent below freezing temperatures.