Westby, Montana
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January -4° 17° -45° (1969) 55° (2002) 0.39" NA
February 25° -42° (1962) 66° (1992) 0.26" NA
March 15° 37° -31° (2002) 77° (1978) 0.56" NA
April 28° 53° -18° (1975) 91° (1980) 0.9" NA
May 41° 66° 13° (2005) 102° (1980) 1.76" NA
June 51° 74° 28° (1951) 103° (1988) 3" NA
July 55° 79° 36° (1987) 107° (1975) 2.48" NA
August 52° 79° 29° (1958) 108° (1983) 1.55" NA
September 40° 67° 15° (1961) 103° (1983) 1.41" NA
October 29° 55° -5° (1991) 92° (1992) 0.71" NA
November 14° 34° -26° (1996) 73° (1999) 0.4" NA
December 22° -42° (1983) 55° (1979) 0.41" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 35° 61° 18° (2002) 85° (1968) 0.04" NA
May 2 36° 61° 18° (1967) 88° (1980) 0.04" NA
May 3 36° 61° 13° (2005) 87° (2000) 0.04" NA
May 4 36° 62° 16° (2002) 84° (1998) 0.04" NA
May 5 37° 62° 25° (1967) 80° (1971) 0.04" NA
May 6 37° 62° 22° (1972) 85° (1953) 0.04" NA
May 7 38° 63° 18° (1984) 90° (1992) 0.04" NA
May 8 38° 63° 21° (1984) 91° (1977) 0.04" NA
May 9 39° 63° 25° (1981) 93° (1977) 0.05" NA
May 10 39° 64° 25° (1996) 93° (1977) 0.05" NA
May 11 39° 64° 23° (1953) 89° (1958) 0.05" NA
May 12 40° 64° 22° (1953) 92° (1977) 0.05" NA
May 13 40° 65° 24° (1953) 95° (1977) 0.05" NA
May 14 41° 65° 24° (2005) 95° (2001) 0.05" NA
May 15 41° 65° 27° (1983) 85° (1949) 0.05" NA
May 16 41° 66° 22° (2002) 88° (1972) 0.06" NA
May 17 42° 66° 24° (2002) 94° (1972) 0.06" NA
May 18 42° 66° 29° (1993) 90° (1972) 0.06" NA
May 19 42° 67° 28° (1997) 91° (2006) 0.06" NA
May 20 43° 67° 27° (2003) 94° (1964) 0.06" NA
May 21 43° 67° 29° (2001) 98° (1980) 0.06" NA
May 22 44° 68° 27° (1963) 102° (1980) 0.06" NA
May 23 44° 68° 24° (1949) 100° (1980) 0.07" NA
May 24 44° 68° 28° (2002) 92° (1977) 0.07" NA
May 25 45° 69° 27° (1992) 88° (1958) 0.07" NA
May 26 45° 69° 28° (1965) 95° (1969) 0.07" NA
May 27 45° 69° 27° (1965) 95° (1969) 0.07" NA
May 28 46° 69° 26° (1952) 100° (1949) 0.08" NA
May 29 46° 70° 33° (1959) 96° (1988) 0.08" NA
May 30 46° 70° 35° (1975) 96° (1988) 0.08" NA
May 31 47° 70° 30° (1954) 88° (1973) 0.08" NA
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