Typical high temperatures in the warm months of June, July, and August are around a comfortable , but during heat waves (which can occur between May and September), daytime high temperatures often exceed , sometimes for a week or two at a time. In the winter, average temperatures normally drop to approximately , though almost every winter there are periods of warmth with day temperatures rising above , and periods of cooling with night temperatures falling below . These periods usually last about a week or two. The growing season in Moscow normally lasts for 156 days usually around May 1 to October 5.