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
Sep 1 43° 76° 25° (1924) 96° (1938) 0.05" NA
Sep 2 43° 75° 27° (1924) 96° (1928) 0.05" NA
Sep 3 43° 75° 26° (1943) 97° (1938) 0.05" NA
Sep 4 42° 75° 28° (1956) 95° (1950) 0.05" NA
Sep 5 42° 74° 28° (1943) 95° (1950) 0.05" NA
Sep 6 42° 74° 26° (1929) 96° (1950) 0.05" NA
Sep 7 42° 73° 22° (1929) 97° (1944) 0.06" NA
Sep 8 41° 73° 26° (1941) 95° (1944) 0.06" NA
Sep 9 41° 72° 27° (1936) 95° (1944) 0.06" NA
Sep 10 41° 72° 24° (1921) 97° (1944) 0.06" NA
Sep 11 41° 72° 27° (1924) 95° (1944) 0.06" NA
Sep 12 40° 71° 25° (1924) 97° (1944) 0.06" NA
Sep 13 40° 71° 20° (1921) 91° (1948) 0.06" NA
Sep 14 40° 70° 20° (1970) 91° (1948) 0.06" NA
Sep 15 40° 70° 19° (1969) 89° (1938) 0.06" NA
Sep 16 39° 69° 22° (1921) 90° (1938) 0.06" NA
Sep 17 39° 69° 24° (1965) 92° (1938) 0.06" NA
Sep 18 39° 69° 20° (1942) 94° (1938) 0.06" NA
Sep 19 39° 68° 20° (1943) 88° (1918) 0.06" NA
Sep 20 38° 68° 22° (1983) 89° (1918) 0.06" NA
Sep 21 38° 67° 21° (1919) 91° (1938) 0.06" NA
Sep 22 38° 67° 25° (1919) 86° (1966) 0.06" NA
Sep 23 38° 66° 20° (2000) 90° (1938) 0.06" NA
Sep 24 37° 66° 9° (1926) 85° (1921) 0.06" NA
Sep 25 37° 65° 14° (1934) 86° (1943) 0.06" NA
Sep 26 37° 65° 23° (1926) 88° (1952) 0.06" NA
Sep 27 37° 65° 22° (1924) 84° (1949) 0.06" NA
Sep 28 36° 64° 21° (1985) 84° (1949) 0.06" NA
Sep 29 36° 64° 20° (1919) 85° (1938) 0.05" NA
Sep 30 36° 63° 22° (1919) 82° (1935) 0.05" NA
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