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
May 1 36° 63° 17° (1954) 85° (1981) 0.07" NA
May 2 36° 63° 10° (1954) 89° (1985) 0.07" NA
May 3 36° 63° 10° (1954) 85° (1985) 0.07" NA
May 4 37° 64° 21° (2002) 82° (1966) 0.07" NA
May 5 37° 64° 23° (1967) 88° (1992) 0.08" NA
May 6 37° 64° 25° (1977) 89° (1992) 0.08" NA
May 7 38° 65° 21° (2002) 89° (1992) 0.08" NA
May 8 38° 65° 27° (1969) 85° (1987) 0.08" NA
May 9 38° 65° 24° (1996) 83° (1949) 0.08" NA
May 10 39° 66° 24° (1968) 87° (1949) 0.09" NA
May 11 39° 66° 23° (1953) 89° (1958) 0.09" NA
May 12 39° 66° 23° (1953) 93° (1960) 0.09" NA
May 13 39° 67° 25° (2004) 89° (2001) 0.09" NA
May 14 40° 67° 25° (1953) 87° (1984) 0.09" NA
May 15 40° 67° 28° (1971) 87° (1984) 0.09" NA
May 16 40° 67° 28° (2002) 89° (1988) 0.09" NA
May 17 41° 68° 30° (1974) 86° (1976) 0.09" NA
May 18 41° 68° 31° (1949) 86° (1992) 0.09" NA
May 19 41° 68° 24° (1997) 93° (1992) 0.1" NA
May 20 41° 69° 29° (1987) 91° (1964) 0.1" NA
May 21 42° 69° 26° (1963) 94° (1980) 0.1" NA
May 22 42° 69° 29° (1969) 96° (1980) 0.1" NA
May 23 42° 70° 27° (2002) 93° (1951) 0.1" NA
May 24 43° 70° 32° (1954) 89° (1988) 0.1" NA
May 25 43° 70° 25° (1992) 88° (1958) 0.1" NA
May 26 43° 71° 29° (1989) 89° (1966) 0.09" NA
May 27 44° 71° 33° (1991) 89° (1966) 0.09" NA
May 28 44° 71° 30° (1952) 91° (1958) 0.09" NA
May 29 44° 72° 28° (1989) 93° (1961) 0.09" NA
May 30 44° 72° 32° (1977) 91° (1984) 0.09" NA
May 31 45° 72° 29° (1982) 91° (1972) 0.09" NA
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