Roundup, Montana
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 12° 36° -41° (1969) 70° (1953) 0.43" NA
February 17° 43° -52° (1936) 75° (1932) 0.36" NA
March 24° 51° -33° (1932) 82° (2004) 0.64" NA
April 32° 60° -9° (1936) 91° (1980) 1.28" NA
May 42° 70° 10° (1954) 100° (1934) 2.35" NA
June 50° 79° 31° (1979) 106° (2002) 2.15" NA
July 55° 87° 36° (1955) 111° (2002) 1.65" NA
August 53° 86° 30° (1992) 108° (1961) 1.29" NA
September 43° 75° 15° (1985) 102° (1983) 1.27" NA
October 34° 63° -10° (1919) 95° (1943) 1.03" NA
November 22° 46° -36° (1959) 78° (1933) 0.34" NA
December 15° 38° -44° (1983) 70° (1980) 0.46" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 18° 40° -23° (1985) 69° (1969) 0.01" NA
Dec 2 17° 40° -43° (1919) 64° (1959) 0.01" NA
Dec 3 17° 40° -31° (1919) 69° (1943) 0.01" NA
Dec 4 17° 39° -17° (1972) 68° (1943) 0.01" NA
Dec 5 17° 39° -33° (1972) 67° (1939) 0.01" NA
Dec 6 16° 39° -35° (1972) 64° (1939) 0.01" NA
Dec 7 16° 39° -23° (1972) 61° (1984) 0.01" NA
Dec 8 16° 39° -35° (1919) 62° (1934) 0.01" NA
Dec 9 16° 39° -37° (1919) 66° (1957) 0.01" NA
Dec 10 16° 39° -27° (1919) 62° (1990) 0.01" NA
Dec 11 15° 38° -31° (1932) 65° (2004) 0.01" NA
Dec 12 15° 38° -28° (1922) 60° (1934) 0.01" NA
Dec 13 15° 38° -27° (1922) 62° (1960) 0.01" NA
Dec 14 15° 38° -21° (1919) 64° (1952) 0.01" NA
Dec 15 15° 38° -22° (1919) 67° (1980) 0.01" NA
Dec 16 15° 38° -27° (1979) 66° (1942) 0.01" NA
Dec 17 14° 37° -31° (1964) 61° (1976) 0.02" NA
Dec 18 14° 37° -34° (1983) 64° (1954) 0.02" NA
Dec 19 14° 37° -17° (1983) 62° (1954) 0.02" NA
Dec 20 14° 37° -22° (1951) 63° (1954) 0.02" NA
Dec 21 14° 37° -34° (1989) 63° (1954) 0.02" NA
Dec 22 14° 37° -36° (1989) 60° (1933) 0.02" NA
Dec 23 13° 37° -26° (1920) 60° (1922) 0.02" NA
Dec 24 13° 37° -44° (1983) 60° (1922) 0.02" NA
Dec 25 13° 36° -33° (1983) 60° (1947) 0.02" NA
Dec 26 13° 36° -30° (1996) 61° (1976) 0.02" NA
Dec 27 13° 36° -34° (1916) 70° (1980) 0.02" NA
Dec 28 13° 36° -34° (1916) 63° (1980) 0.02" NA
Dec 29 13° 36° -28° (1968) 63° (1956) 0.02" NA
Dec 30 13° 36° -35° (1978) 59° (1956) 0.02" NA
Dec 31 12° 36° -27° (1978) 58° (1963) 0.02" NA
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