Helena, Montana
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 10° 30° -42° (1957) 63° (1902) 0.52" 8.2"
February 16° 37° -42° (1996) 69° (1995) 0.38" 5.7"
March 24° 47° -30° (1955) 78° (2004) 0.63" 6.8"
April 31° 57° -10° (1936) 86° (1992) 0.91" 4.6"
May 40° 66° 17° (1954) 95° (1919) 1.78" 0.9"
June 48° 75° 30° (1999) 102° (1900) 1.82" 0"
July 52° 83° 36° (1971) 105° (2002) 1.34" 0"
August 51° 83° 28° (1992) 105° (1969) 1.29" 0.3"
September 41° 71° 6° (1926) 99° (1967) 1.05" 1.2"
October 31° 58° -8° (1991) 87° (2001) 0.66" 2.8"
November 20° 42° -39° (1959) 75° (1999) 0.48" 5.4"
December 11° 31° -40° (1880) 64° (1980) 0.46" 7.4"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 36° 62° 20° (1954) 82° (2000) 0.04" NA
May 2 36° 62° 17° (1954) 86° (1947) 0.05" NA
May 3 36° 62° 23° (1967) 84° (1966) 0.05" NA
May 4 36° 62° 22° (1996) 87° (1966) 0.05" NA
May 5 37° 63° 20° (1996) 86° (1966) 0.05" NA
May 6 37° 63° 23° (1996) 90° (1966) 0.05" NA
May 7 37° 63° 22° (1885) 86° (1992) 0.05" NA
May 8 38° 64° 23° (1997) 85° (1987) 0.05" NA
May 9 38° 64° 24° (2002) 84° (1994) 0.05" NA
May 10 38° 64° 23° (1946) 88° (1940) 0.05" NA
May 11 38° 65° 25° (1968) 87° (1993) 0.06" NA
May 12 39° 65° 22° (1943) 92° (2001) 0.06" NA
May 13 39° 65° 23° (1983) 89° (2001) 0.06" NA
May 14 39° 65° 25° (1995) 88° (1936) 0.06" NA
May 15 40° 66° 26° (1943) 88° (1944) 0.06" NA
May 16 40° 66° 28° (1986) 91° (2006) 0.06" NA
May 17 40° 66° 26° (1943) 90° (2006) 0.06" NA
May 18 40° 66° 26° (1903) 91° (2006) 0.06" NA
May 19 41° 67° 24° (1997) 90° (1954) 0.06" NA
May 20 41° 67° 28° (1959) 90° (2002) 0.06" NA
May 21 41° 67° 27° (1953) 89° (1980) 0.06" NA
May 22 41° 68° 31° (1947) 86° (2001) 0.06" NA
May 23 42° 68° 26° (1944) 89° (2001) 0.06" NA
May 24 42° 68° 29° (1989) 93° (2001) 0.06" NA
May 25 42° 69° 25° (1950) 89° (2003) 0.06" NA
May 26 43° 69° 29° (1975) 88° (1966) 0.06" NA
May 27 43° 69° 27° (1995) 90° (1986) 0.06" NA
May 28 43° 69° 28° (1947) 95° (1919) 0.06" NA
May 29 43° 70° 27° (1951) 91° (2003) 0.07" NA
May 30 44° 70° 29° (1977) 92° (1986) 0.07" NA
May 31 44° 70° 27° (1917) 88° (1956) 0.07" NA
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