Heron, Montana
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 22° 33° -39° (1927) 61° (1913) 4.25" 24.5"
February 23° 38° -32° (1936) 59° (1995) 3.01" 11.9"
March 27° 47° -22° (1955) 73° (1915) 2.94" 8.6"
April 32° 57° -10° (1936) 88° (1977) 2.36" 1.3"
May 38° 66° 19° (1954) 96° (1936) 2.83" 0.1"
June 45° 73° 25° (1951) 99° (1924) 2.82" 0"
July 47° 81° 29° (1924) 105° (1939) 1.38" 0"
August 46° 81° 21° (1969) 106° (1961) 1.07" 0"
September 40° 70° 9° (1926) 97° (1944) 1.73" 0"
October 33° 55° 4° (1935) 87° (1943) 2.69" 0.3"
November 29° 40° -16° (1955) 69° (1923) 4.61" 8.5"
December 22° 32° -35° (1968) 66° (1912) 4.15" 24.8"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 25° 34° -14° (1985) 52° (1995) 0.15" 0.6"
Dec 2 24° 34° -3° (1931) 53° (1932) 0.16" 0.5"
Dec 3 24° 34° -3° (1919) 56° (1958) 0.15" 0.6"
Dec 4 24° 33° -1° (1919) 51° (1918) 0.15" 0.7"
Dec 5 23° 33° -2° (1928) 66° (1912) 0.14" 0.6"
Dec 6 23° 33° -4° (1919) 58° (1912) 0.15" 0.7"
Dec 7 23° 33° -8° (1971) 55° (1912) 0.14" 0.7"
Dec 8 23° 32° -9° (1932) 52° (1938) 0.14" 0.7"
Dec 9 22° 32° -15° (1932) 52° (1979) 0.14" 0.7"
Dec 10 22° 32° -14° (1927) 49° (1946) 0.12" 0.7"
Dec 11 22° 32° -16° (1932) 48° (2004) 0.13" 0.7"
Dec 12 22° 32° -27° (1922) 56° (1921) 0.13" 0.7"
Dec 13 22° 32° -19° (1919) 55° (1921) 0.12" 0.8"
Dec 14 21° 31° -19° (1922) 49° (1924) 0.13" 0.7"
Dec 15 21° 31° -23° (1922) 45° (2002) 0.13" 0.8"
Dec 16 21° 31° -14° (1924) 46° (1942) 0.13" 0.8"
Dec 17 21° 31° -25° (1922) 45° (1917) 0.12" 0.8"
Dec 18 21° 31° -27° (1924) 53° (1917) 0.13" 0.9"
Dec 19 21° 31° -22° (1924) 52° (1917) 0.12" 0.9"
Dec 20 21° 31° -15° (1924) 49° (1933) 0.13" 0.8"
Dec 21 21° 31° -25° (1990) 57° (1933) 0.13" 0.9"
Dec 22 21° 31° -20° (1990) 57° (1933) 0.13" 0.9"
Dec 23 21° 31° -15° (1990) 52° (1933) 0.12" 1"
Dec 24 21° 31° -21° (1924) 45° (1922) 0.14" 0.9"
Dec 25 21° 31° -20° (1944) 47° (1929) 0.13" 1"
Dec 26 21° 31° -11° (1924) 47° (1980) 0.13" 0.9"
Dec 27 21° 31° -11° (1916) 53° (1980) 0.14" 1"
Dec 28 21° 31° -10° (1983) 48° (1980) 0.13" 1"
Dec 29 21° 31° -29° (1990) 50° (1929) 0.13" 0.9"
Dec 30 21° 31° -35° (1968) 50° (1929) 0.13" 1"
Dec 31 21° 31° -32° (1978) 46° (1942) 0.13" 0.9"
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