Roundup, Montana
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 15° 40° -41° (1969) 70° (1953) 0.34" 4.7"
February 18° 44° -52° (1936) 75° (1932) 0.33" 2.9"
March 24° 53° -33° (1932) 82° (2004) 0.71" 4.2"
April 32° 62° -9° (1936) 91° (1980) 1.51" 0.6"
May 42° 72° 10° (1954) 100° (1934) 2.27" 0.1"
June 50° 80° 31° (1979) 106° (2002) 2.65" 0"
July 56° 90° 36° (1955) 111° (2002) 1.88" 0"
August 54° 89° 30° (1992) 108° (1961) 1.12" 0"
September 44° 77° 15° (1985) 102° (1983) 1.18" 0.1"
October 34° 63° -10° (1919) 95° (1943) 1.02" 0.6"
November 24° 48° -36° (1959) 78° (1933) 0.45" 2.7"
December 15° 39° -44° (1983) 70° (1980) 0.7" 5.1"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Sep 1 49° 84° 34° (1930) 102° (1983) 0.04" 0"
Sep 2 48° 84° 32° (1959) 100° (1983) 0.04" 0"
Sep 3 48° 83° 30° (1961) 100° (1950) 0.04" 0"
Sep 4 48° 83° 28° (1962) 102° (1950) 0.04" 0"
Sep 5 47° 82° 33° (1956) 99° (1998) 0.04" 0"
Sep 6 47° 82° 32° (1956) 97° (1976) 0.04" 0"
Sep 7 47° 82° 33° (1972) 98° (1944) 0.04" 0"
Sep 8 46° 81° 30° (1943) 97° (1979) 0.04" 0"
Sep 9 46° 81° 24° (1962) 99° (1942) 0.04" 0"
Sep 10 46° 80° 30° (1992) 95° (1966) 0.04" 0"
Sep 11 45° 80° 22° (1921) 96° (1959) 0.04" 0"
Sep 12 45° 79° 26° (1989) 94° (1937) 0.03" 0"
Sep 13 44° 79° 26° (1989) 94° (1944) 0.04" 0"
Sep 14 44° 78° 28° (1916) 99° (1948) 0.04" 0"
Sep 15 44° 78° 28° (1951) 96° (2000) 0.04" 0"
Sep 16 43° 77° 26° (1936) 95° (2002) 0.04" 0"
Sep 17 43° 77° 22° (1965) 98° (1943) 0.04" 0"
Sep 18 43° 76° 24° (2003) 95° (1937) 0.03" 0"
Sep 19 42° 76° 26° (1943) 96° (1981) 0.04" 0"
Sep 20 42° 75° 25° (1983) 95° (1938) 0.04" 0"
Sep 21 42° 75° 22° (1972) 95° (1938) 0.04" 0"
Sep 22 41° 74° 21° (1961) 94° (1938) 0.04" 0"
Sep 23 41° 74° 25° (1931) 93° (1966) 0.04" 0"
Sep 24 41° 73° 22° (1934) 93° (1938) 0.05" 0"
Sep 25 40° 73° 22° (1984) 92° (1974) 0.04" 0"
Sep 26 40° 72° 19° (1972) 92° (1963) 0.04" 0"
Sep 27 40° 72° 21° (1961) 91° (1963) 0.04" 0"
Sep 28 39° 72° 22° (1972) 92° (1967) 0.04" 0"
Sep 29 39° 71° 21° (1972) 92° (1967) 0.03" 0"
Sep 30 39° 71° 15° (1985) 91° (1963) 0.04" 0.1"
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