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
Sep 1 50° 74° 41° (1973) 87° (1974) 0.11" NA
Sep 2 50° 73° 40° (1984) 98° (1988) 0.12" NA
Sep 3 50° 73° 38° (2000) 95° (2006) 0.12" NA
Sep 4 50° 73° 35° (2000) 91° (2003) 0.12" NA
Sep 5 49° 73° 38° (2000) 90° (2003) 0.13" NA
Sep 6 49° 73° 35° (2000) 89° (2003) 0.13" NA
Sep 7 49° 73° 38° (1992) 91° (1981) 0.13" NA
Sep 8 49° 72° 39° (1983) 83° (1993) 0.13" NA
Sep 9 49° 72° 37° (1970) 88° (1997) 0.14" NA
Sep 10 48° 72° 39° (1970) 82° (1993) 0.14" NA
Sep 11 48° 72° 40° (1972) 86° (1975) 0.14" NA
Sep 12 48° 72° 35° (1970) 88° (1975) 0.15" NA
Sep 13 48° 71° 32° (1970) 87° (1979) 0.15" NA
Sep 14 48° 71° 36° (1971) 90° (1979) 0.15" NA
Sep 15 47° 71° 38° (1970) 90° (1981) 0.16" NA
Sep 16 47° 71° 36° (1973) 86° (1981) 0.16" NA
Sep 17 47° 70° 34° (1971) 82° (1991) 0.16" NA
Sep 18 47° 70° 37° (1971) 83° (1991) 0.17" NA
Sep 19 47° 70° 35° (1983) 81° (1976) 0.17" NA
Sep 20 46° 69° 37° (1983) 87° (1974) 0.17" NA
Sep 21 46° 69° 39° (1993) 85° (1974) 0.18" NA
Sep 22 46° 69° 34° (2000) 86° (1990) 0.18" NA
Sep 23 46° 69° 36° (1972) 82° (1989) 0.18" NA
Sep 24 46° 68° 32° (1972) 87° (1997) 0.19" NA
Sep 25 45° 68° 30° (1972) 88° (1991) 0.19" NA
Sep 26 45° 68° 34° (1972) 80° (2006) 0.19" NA
Sep 27 45° 67° 34° (1972) 84° (1970) 0.2" NA
Sep 28 45° 67° 32° (1983) 87° (2003) 0.2" NA
Sep 29 45° 66° 33° (1972) 88° (2003) 0.2" NA
Sep 30 44° 66° 32° (1983) 79° (1975) 0.21" NA
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