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
Aug 1 52° 76° 47° (1975) 85° (2000) 0.06" NA
Aug 2 53° 76° 44° (1987) 85° (1977) 0.06" NA
Aug 3 53° 76° 44° (2002) 93° (1993) 0.06" NA
Aug 4 53° 76° 44° (1979) 92° (1993) 0.06" NA
Aug 5 53° 76° 45° (1978) 88° (1990) 0.06" NA
Aug 6 53° 76° 41° (1975) 86° (1972) 0.06" NA
Aug 7 53° 76° 46° (1974) 91° (1981) 0.07" NA
Aug 8 53° 76° 43° (1979) 95° (1978) 0.07" NA
Aug 9 53° 76° 42° (1975) 98° (1981) 0.07" NA
Aug 10 53° 76° 45° (1970) 96° (1981) 0.07" NA
Aug 11 53° 76° 44° (1972) 95° (1990) 0.07" NA
Aug 12 52° 76° 42° (2000) 93° (1977) 0.07" NA
Aug 13 52° 76° 43° (2000) 90° (1992) 0.07" NA
Aug 14 52° 76° 43° (2000) 90° (2002) 0.07" NA
Aug 15 52° 76° 43° (1982) 90° (2003) 0.07" NA
Aug 16 52° 75° 42° (2000) 92° (1977) 0.08" NA
Aug 17 52° 75° 42° (1970) 96° (1977) 0.08" NA
Aug 18 52° 75° 38° (1973) 87° (1991) 0.08" NA
Aug 19 52° 75° 42° (1973) 86° (1991) 0.08" NA
Aug 20 52° 75° 41° (1973) 86° (2006) 0.08" NA
Aug 21 52° 75° 40° (1973) 87° (2006) 0.08" NA
Aug 22 52° 75° 39° (1973) 85° (2003) 0.09" NA
Aug 23 52° 75° 38° (1973) 86° (1985) 0.09" NA
Aug 24 51° 75° 42° (1992) 87° (1982) 0.09" NA
Aug 25 51° 75° 40° (1973) 84° (1982) 0.09" NA
Aug 26 51° 74° 43° (1991) 88° (1986) 0.1" NA
Aug 27 51° 74° 40° (2000) 87° (1986) 0.1" NA
Aug 28 51° 74° 42° (2000) 89° (2006) 0.1" NA
Aug 29 51° 74° 39° (1980) 93° (1996) 0.1" NA
Aug 30 50° 74° 44° (1972) 89° (2007) 0.11" NA
Aug 31 50° 74° 42° (1977) 89° (1987) 0.11" NA
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