May is the month known for springtime rains along the Front Range. On average the month can come through with 2.12 inches of precipitation. Making it the wettest month on average for Denver. Followed up by July, April and August.
The wettest month ever recorded in the Mile High City happened in the soaking year of 1876. When 8.57 inches of rainfall was measured for Denver. That’s pretty impressive when you consider the average precipitation for the year is only 14.92 inches!
As far as snowfall is concerned, there is typically, not a ton of snow in this month. The average is 1.1 inches. However, May is a transition month from winter-like storms to spring storms. Meaning there is still a shot for snow. As already evidenced by the snowstorms of this year.
As of May 3rd, 2013 Denver has officially, seen 3.4 inches of snow! In fact, the latest date for snowfall in the city of Denver is June 12th.
The most snow ever recorded in Denver happened in 1898 with 15.5 inches. 1950 comes in second with 13.6 inches. And in 3rd place 1978 with 13.5 inches.
During the month of May we continue to see cold air dropping southward from Canada. But, what is different is the warm moist air that begins to bubble up from the south.
These to clashing air masses tend to meet in the nations mid-section and get the severe weather season really going for the state of Colorado.