Index, Washington
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 31° 40° 3° (1982) 62° (2005) 16.05" 20.5"
February 32° 46° 6° (1989) 73° (1992) 11.92" 11"
March 34° 52° 16° (1989) 80° (1994) 10.24" 3.8"
April 38° 59° 27° (1975) 91° (1998) 7.83" 1"
May 43° 65° 30° (1972) 100° (1983) 5.58" 0"
June 48° 69° 31° (1976) 98° (1970) 4.04" 0"
July 51° 75° 37° (1971) 100° (2006) 2.41" 0"
August 52° 75° 38° (1973) 98° (1981) 2.45" 0"
September 47° 70° 30° (1972) 98° (1988) 4.77" 0"
October 41° 59° 23° (2002) 86° (1980) 9.97" 0"
November 35° 46° 8° (1985) 70° (1970) 18.03" 6"
December 31° 40° 1° (1990) 60° (2002) 16.63" 15.5"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Jul 1 50° 73° 42° (1972) 87° (1995) 0.1" NA
Jul 2 50° 73° 37° (1971) 89° (1985) 0.1" NA
Jul 3 50° 73° 38° (1971) 90° (1970) 0.1" NA
Jul 4 50° 74° 43° (1988) 93° (1972) 0.1" NA
Jul 5 50° 74° 41° (1996) 86° (1972) 0.09" NA
Jul 6 51° 74° 41° (1974) 83° (1975) 0.09" NA
Jul 7 51° 74° 39° (1971) 83° (1985) 0.09" NA
Jul 8 51° 74° 43° (1984) 85° (1985) 0.09" NA
Jul 9 51° 75° 43° (1984) 89° (1985) 0.09" NA
Jul 10 51° 75° 44° (1972) 84° (2002) 0.08" NA
Jul 11 51° 75° 44° (1970) 93° (2002) 0.08" NA
Jul 12 51° 75° 43° (1973) 96° (2007) 0.08" NA
Jul 13 51° 75° 43° (1970) 86° (1996) 0.08" NA
Jul 14 51° 75° 43° (1979) 90° (1996) 0.08" NA
Jul 15 51° 76° 44° (2000) 92° (1970) 0.08" NA
Jul 16 52° 76° 44° (2000) 95° (1979) 0.07" NA
Jul 17 52° 76° 46° (1974) 91° (1979) 0.07" NA
Jul 18 52° 76° 41° (1976) 91° (1985) 0.07" NA
Jul 19 52° 76° 41° (1977) 95° (1988) 0.07" NA
Jul 20 52° 76° 43° (1974) 95° (1994) 0.07" NA
Jul 21 52° 76° 46° (1984) 92° (1990) 0.07" NA
Jul 22 52° 76° 41° (1982) 100° (2006) 0.07" NA
Jul 23 52° 76° 41° (1982) 95° (1991) 0.07" NA
Jul 24 52° 76° 41° (1973) 97° (2004) 0.07" NA
Jul 25 52° 76° 46° (1974) 97° (2004) 0.07" NA
Jul 26 52° 76° 45° (2003) 93° (1998) 0.07" NA
Jul 27 52° 76° 41° (1976) 94° (1998) 0.07" NA
Jul 28 52° 76° 45° (1976) 96° (1998) 0.06" NA
Jul 29 52° 76° 44° (1980) 97° (1971) 0.06" NA
Jul 30 52° 76° 44° (1986) 94° (2003) 0.06" NA
Jul 31 53° 76° 45° (1970) 93° (2003) 0.06" NA
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