Weather By Day

May Weather In Great Falls  
May Great Falls Weather
Record High: 100°F
Normal High: 65°F
Normal Low: 38°F
Record Low: 12°F
Avg Monthly Rain: 2.53"
Rec 1 Day Rain: 2.83"
Avg Monthly Snow: 1.9"
Rec 1 Day Snow: 7.5"

Great Falls Weather In May

The hottest May day in Great Falls for the past 73 years was 100 degrees Fahrenheit, measured on May 22, 1919, while the standard high temperature is 65. In the last 73 years the lowest measured May temperature in Great Falls was 12 most recently measured on May 1, 1954, while the regular low temperature for a given day during the month is 38.

US National Weather Service historical Great Falls May Weather data records that on May 1, 1954, the high temperature did not exceed 30 degrees Fahrenheit, the lowest high measured in Great Falls in the past 73 years. NWS weather data additionally shows that on May 15, 1936, the lowest recorded temperature on that day did not drop below 66 degrees, the highest low measured in Great Falls in the last 73 years.

National Weather Service records indicate that the high temperature in Great Falls on May First averages 62 degrees and the high on the last day of the month averages 71 degrees. The low recorded temperature in Great Falls on May First averages 36 degrees Fahrenheit and the low temperature on the final day of May averages 45 degrees.

Great Falls normally receives an average of 2.53 inches of rain during May. May Great Falls Weather records show that on May 29, 1953 Great Falls received 2.83 inches of rain, the most rain measured in a single day in May. Great Falls averages 1.9 inches of snow in May. The most snow measured in a single day in May was 7.5 inches on May 4, 1913.