Roy, Montana
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 32° -41° (1997) 69° (1992) 0.5" 9"
February 13° 38° -39° (1996) 72° (1992) 0.31" 6.1"
March 22° 46° -33° (1989) 81° (2004) 0.81" 8"
April 31° 58° -5° (1986) 90° (1980) 1.14" 6.6"
May 40° 67° 10° (1954) 96° (1980) 2.73" 1.2"
June 48° 77° 29° (1969) 103° (1984) 2.3" 0.1"
July 53° 85° 36° (1972) 105° (2003) 1.97" 0"
August 52° 85° 30° (1992) 107° (1983) 1.53" 0"
September 42° 73° 16° (1985) 103° (1983) 1.22" 0.2"
October 32° 61° -11° (1991) 92° (1992) 0.73" 2.3"
November 20° 44° -29° (1959) 78° (1999) 0.44" 5.3"
December 10° 34° -41° (1989) 69° (1956) 0.5" 8.5"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 14° 37° -19° (1985) 65° (1988) 0.01" NA
Dec 2 14° 37° -32° (1985) 64° (1959) 0.01" NA
Dec 3 13° 37° -18° (1972) 62° (1987) 0.01" NA
Dec 4 13° 37° -25° (1972) 68° (1979) 0.01" NA
Dec 5 13° 36° -22° (1972) 60° (1988) 0.01" NA
Dec 6 13° 36° -30° (1972) 61° (1965) 0.01" NA
Dec 7 12° 36° -26° (1956) 59° (1990) 0.01" NA
Dec 8 12° 36° -35° (1972) 63° (1990) 0.01" NA
Dec 9 12° 36° -33° (1977) 66° (1957) 0.01" NA
Dec 10 11° 35° -19° (1977) 60° (1981) 0.01" NA
Dec 11 11° 35° -21° (1961) 62° (2004) 0.01" NA
Dec 12 11° 35° -23° (2000) 58° (1960) 0.01" NA
Dec 13 11° 35° -18° (1972) 62° (1960) 0.02" NA
Dec 14 11° 35° -25° (1972) 65° (1997) 0.02" NA
Dec 15 10° 34° -25° (1951) 65° (1962) 0.02" NA
Dec 16 10° 34° -30° (1964) 68° (1980) 0.02" NA
Dec 17 10° 34° -28° (1964) 63° (1976) 0.02" NA
Dec 18 10° 34° -27° (1955) 64° (1979) 0.02" NA
Dec 19 10° 34° -23° (1983) 65° (1979) 0.02" NA
Dec 20 33° -27° (1949) 62° (2004) 0.02" NA
Dec 21 33° -41° (1989) 61° (1954) 0.02" NA
Dec 22 33° -37° (1989) 60° (1954) 0.02" NA
Dec 23 33° -25° (1983) 55° (1963) 0.02" NA
Dec 24 33° -38° (1983) 62° (1999) 0.02" NA
Dec 25 33° -26° (1983) 57° (1950) 0.02" NA
Dec 26 32° -25° (1996) 60° (1980) 0.02" NA
Dec 27 32° -22° (1965) 65° (1980) 0.02" NA
Dec 28 32° -24° (1968) 62° (1999) 0.02" NA
Dec 29 32° -33° (1968) 69° (1956) 0.02" NA
Dec 30 32° -33° (1968) 57° (1956) 0.02" NA
Dec 31 32° -30° (1992) 60° (1963) 0.02" NA
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