Jefferson, Colorado
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 11° 33° -28° (1979) 56° (2005) 0.72" 11.8"
February 11° 34° -26° (1985) 55° (1979) 0.93" 13.7"
March 15° 38° -21° (1969) 62° (1987) 1.93" 30.5"
April 22° 44° -14° (1997) 64° (1992) 2.55" 24.2"
May 31° 53° 8° (1979) 75° (2000) 1.98" 8.7"
June 40° 64° 8° (1999) 84° (1979) 1.93" 0.4"
July 45° 70° 27° (1992) 83° (1983) 2.7" 0"
August 43° 68° 24° (1978) 78° (1986) 3.01" 0.1"
September 36° 61° 9° (1985) 78° (1983) 1.64" 2.6"
October 28° 51° -5° (1993) 72° (1997) 1.36" 9.6"
November 18° 40° -21° (1979) 63° (1975) 1.38" 18.1"
December 11° 33° -23° (1996) 57° (1998) 1.01" 18.9"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 27° 48° 8° (1970) 61° (1992) 0.07" 0.6"
May 2 27° 48° 10° (1997) 63° (2001) 0.06" 0.5"
May 3 27° 49° 11° (1997) 64° (2000) 0.07" 0.4"
May 4 28° 49° 10° (1995) 65° (2000) 0.06" 0.5"
May 5 28° 49° 10° (1975) 67° (2000) 0.06" 0.4"
May 6 28° 50° 13° (1999) 69° (2000) 0.07" 0.5"
May 7 29° 50° 12° (1999) 64° (2000) 0.06" 0.4"
May 8 29° 50° 18° (1986) 64° (1977) 0.06" 0.4"
May 9 29° 51° 11° (1990) 62° (1977) 0.06" 0.4"
May 10 30° 51° 10° (1979) 62° (1991) 0.06" 0.3"
May 11 30° 52° 8° (1979) 65° (2000) 0.06" 0.2"
May 12 30° 52° 17° (1999) 66° (2007) 0.06" 0.3"
May 13 31° 52° 17° (1981) 67° (2001) 0.06" 0.3"
May 14 31° 53° 15° (1983) 67° (1978) 0.06" 0.3"
May 15 31° 53° 18° (1970) 67° (1978) 0.07" 0.2"
May 16 32° 53° 23° (1976) 68° (1978) 0.06" 0.3"
May 17 32° 54° 18° (1986) 69° (1996) 0.06" 0.2"
May 18 32° 54° 16° (1983) 66° (1994) 0.06" 0.2"
May 19 32° 55° 21° (1971) 69° (2009) 0.06" 0.3"
May 20 33° 55° 22° (1983) 68° (2005) 0.06" 0.2"
May 21 33° 55° 13° (2001) 72° (2005) 0.07" 0.2"
May 22 33° 56° 18° (1978) 70° (2005) 0.07" 0.2"
May 23 33° 56° 21° (1995) 71° (2005) 0.06" 0.2"
May 24 34° 56° 16° (1995) 72° (2005) 0.07" 0.2"
May 25 34° 57° 20° (1995) 68° (2006) 0.06" 0.2"
May 26 34° 57° 21° (1995) 70° (1969) 0.07" 0.2"
May 27 34° 57° 22° (1989) 72° (1969) 0.07" 0.2"
May 28 35° 58° 18° (1995) 70° (2003) 0.07" 0.1"
May 29 35° 58° 19° (1995) 74° (2000) 0.06" 0.1"
May 30 35° 59° 17° (1975) 75° (2000) 0.07" 0.1"
May 31 36° 59° 22° (1979) 75° (2000) 0.07" 0.1"
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