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
May 1 40° 62° 30° (1972) 90° (1998) 0.22" NA
May 2 40° 63° 31° (2006) 83° (2004) 0.21" NA
May 3 41° 63° 34° (1982) 86° (1992) 0.21" NA
May 4 41° 63° 36° (1982) 88° (1980) 0.21" NA
May 5 41° 63° 31° (1982) 84° (1990) 0.2" NA
May 6 41° 64° 32° (1970) 81° (1987) 0.2" NA
May 7 41° 64° 33° (2000) 85° (1987) 0.2" NA
May 8 42° 64° 34° (1996) 86° (1987) 0.2" NA
May 9 42° 64° 31° (1996) 85° (1976) 0.19" NA
May 10 42° 64° 32° (1973) 82° (1988) 0.19" NA
May 11 42° 64° 32° (1973) 88° (1971) 0.19" NA
May 12 42° 65° 31° (1985) 85° (1993) 0.19" NA
May 13 43° 65° 35° (1986) 90° (1973) 0.18" NA
May 14 43° 65° 34° (1974) 93° (1973) 0.18" NA
May 15 43° 65° 32° (1986) 87° (1973) 0.18" NA
May 16 43° 65° 34° (1986) 87° (1985) 0.18" NA
May 17 43° 65° 34° (2003) 87° (2006) 0.17" NA
May 18 44° 66° 32° (1976) 81° (2006) 0.17" NA
May 19 44° 66° 33° (1982) 82° (1978) 0.17" NA
May 20 44° 66° 35° (1974) 83° (1978) 0.17" NA
May 21 44° 66° 33° (1973) 86° (1988) 0.17" NA
May 22 44° 66° 37° (1984) 80° (1985) 0.17" NA
May 23 44° 66° 35° (1978) 80° (1983) 0.16" NA
May 24 45° 66° 32° (1975) 87° (1992) 0.16" NA
May 25 45° 66° 35° (1972) 83° (1986) 0.16" NA
May 26 45° 67° 37° (1982) 82° (2005) 0.16" NA
May 27 45° 67° 33° (1973) 88° (2005) 0.16" NA
May 28 45° 67° 34° (1974) 100° (1983) 0.16" NA
May 29 45° 67° 36° (1974) 96° (1983) 0.16" NA
May 30 46° 67° 35° (1978) 86° (2007) 0.16" NA
May 31 46° 67° 36° (1976) 89° (2007) 0.15" NA
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