Roy, Montana
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 10° 35° -41° (1997) 69° (1992) 0.36" 7.1"
February 14° 38° -39° (1996) 72° (1992) 0.31" 5"
March 22° 48° -33° (1989) 81° (2004) 0.68" 6.9"
April 31° 58° -5° (1986) 90° (1980) 1.11" 3"
May 40° 67° 10° (1954) 96° (1980) 2.77" 1.1"
June 49° 76° 29° (1969) 103° (1984) 2.35" 0.1"
July 54° 86° 36° (1972) 105° (2003) 1.76" 0"
August 52° 86° 30° (1992) 107° (1983) 1.26" 0"
September 43° 74° 16° (1985) 103° (1983) 1.15" 0.3"
October 32° 60° -11° (1991) 92° (1992) 0.85" 2.1"
November 20° 46° -29° (1959) 78° (1999) 0.41" 4.7"
December 10° 35° -41° (1989) 69° (1956) 0.49" 6.5"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Sep 1 48° 80° 33° (1994) 103° (1983) 0.04" 0"
Sep 2 47° 80° 29° (1959) 98° (1983) 0.03" 0"
Sep 3 47° 79° 33° (1962) 98° (2001) 0.04" 0"
Sep 4 46° 79° 28° (1956) 99° (1998) 0.04" 0"
Sep 5 46° 78° 33° (1956) 95° (1967) 0.04" 0"
Sep 6 46° 78° 29° (1956) 100° (1980) 0.05" 0"
Sep 7 45° 77° 29° (1956) 97° (1958) 0.04" 0"
Sep 8 45° 77° 29° (1960) 95° (1979) 0.04" 0"
Sep 9 45° 77° 23° (1962) 95° (1998) 0.04" 0"
Sep 10 44° 76° 29° (1959) 92° (1968) 0.04" 0"
Sep 11 44° 76° 20° (1989) 96° (1959) 0.04" 0"
Sep 12 44° 75° 24° (1970) 94° (1953) 0.04" 0"
Sep 13 43° 75° 25° (1949) 93° (1959) 0.04" 0"
Sep 14 43° 74° 22° (1970) 98° (1948) 0.04" 0"
Sep 15 43° 74° 23° (1970) 97° (2002) 0.03" 0"
Sep 16 42° 74° 29° (1973) 97° (1998) 0.04" 0"
Sep 17 42° 73° 29° (1965) 90° (1964) 0.04" 0"
Sep 18 42° 73° 21° (1991) 93° (1966) 0.04" 0.1"
Sep 19 41° 72° 27° (1957) 95° (1981) 0.04" 0"
Sep 20 41° 72° 27° (1975) 86° (1991) 0.04" 0"
Sep 21 41° 71° 18° (1995) 89° (1967) 0.03" 0"
Sep 22 40° 71° 24° (1961) 90° (1948) 0.04" 0"
Sep 23 40° 70° 23° (1955) 93° (1992) 0.04" 0"
Sep 24 40° 70° 23° (1984) 91° (2001) 0.03" 0"
Sep 25 39° 70° 20° (1984) 91° (2001) 0.04" 0.1"
Sep 26 39° 69° 21° (1972) 92° (1952) 0.04" 0"
Sep 27 39° 69° 22° (1964) 92° (1957) 0.03" 0"
Sep 28 38° 68° 20° (1984) 87° (1967) 0.04" 0"
Sep 29 38° 68° 16° (1985) 91° (1967) 0.03" 0.1"
Sep 30 38° 67° 18° (1985) 92° (1963) 0.04" 0"
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