Heron, Montana
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 20° 32° -39° (1927) 61° (1913) 4.27" 28.7"
February 23° 37° -32° (1936) 59° (1995) 3.38" 16.6"
March 27° 46° -22° (1955) 73° (1915) 2.68" 7.7"
April 32° 57° -10° (1936) 88° (1977) 2.22" 1.3"
May 38° 66° 19° (1954) 96° (1936) 2.81" 0.2"
June 44° 73° 25° (1951) 99° (1924) 2.62" 0"
July 47° 81° 29° (1924) 105° (1939) 1.46" 0"
August 46° 80° 21° (1969) 106° (1961) 1.35" 0"
September 40° 70° 9° (1926) 97° (1944) 1.72" 0"
October 33° 55° 4° (1935) 87° (1943) 2.24" 0.4"
November 28° 39° -16° (1955) 69° (1923) 4.55" 9"
December 21° 32° -35° (1968) 66° (1912) 4.46" 22.9"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 35° 63° 19° (1954) 82° (1931) 0.08" NA
May 2 35° 63° 21° (1944) 83° (1924) 0.08" NA
May 3 35° 63° 23° (1923) 85° (1918) 0.08" NA
May 4 36° 63° 24° (1942) 83° (1966) 0.08" NA
May 5 36° 64° 24° (1919) 88° (1966) 0.08" NA
May 6 36° 64° 20° (1924) 87° (1953) 0.09" NA
May 7 36° 64° 23° (1965) 86° (1947) 0.09" NA
May 8 37° 64° 21° (2002) 84° (1947) 0.09" NA
May 9 37° 65° 20° (1922) 86° (1949) 0.09" NA
May 10 37° 65° 21° (1922) 88° (1941) 0.09" NA
May 11 37° 65° 22° (1922) 90° (1924) 0.09" NA
May 12 38° 66° 21° (1943) 92° (1949) 0.09" NA
May 13 38° 66° 23° (1943) 93° (1993) 0.09" NA
May 14 38° 66° 23° (1964) 88° (1924) 0.09" NA
May 15 38° 66° 26° (1923) 88° (1939) 0.09" NA
May 16 38° 67° 26° (1926) 87° (2006) 0.09" NA
May 17 39° 67° 23° (1942) 90° (2006) 0.09" NA
May 18 39° 67° 24° (1965) 90° (2006) 0.09" NA
May 19 39° 67° 25° (1931) 85° (1925) 0.09" NA
May 20 39° 67° 25° (1933) 87° (1928) 0.09" NA
May 21 39° 68° 26° (1934) 92° (1928) 0.09" NA
May 22 40° 68° 28° (1920) 90° (1988) 0.09" NA
May 23 40° 68° 24° (1960) 89° (2001) 0.09" NA
May 24 40° 68° 26° (1950) 91° (1928) 0.09" NA
May 25 40° 69° 23° (1926) 95° (1928) 0.1" NA
May 26 40° 69° 24° (1918) 93° (1928) 0.1" NA
May 27 41° 69° 25° (1918) 89° (1958) 0.1" NA
May 28 41° 69° 26° (1921) 90° (1934) 0.1" NA
May 29 41° 69° 26° (1916) 91° (1983) 0.1" NA
May 30 41° 69° 26° (1926) 96° (1936) 0.1" NA
May 31 41° 70° 23° (1926) 91° (1986) 0.1" NA
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