Index, Washington
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 32° 43° 3° (1982) 62° (2005) 15.95" 15.8"
February 32° 48° 6° (1989) 73° (1992) 10.61" 8.2"
March 35° 53° 16° (1989) 80° (1994) 10.39" 3.2"
April 38° 59° 27° (1975) 91° (1998) 7.83" 0.9"
May 44° 65° 30° (1972) 100° (1983) 5.56" 0"
June 49° 70° 31° (1976) 98° (1970) 4.2" 0"
July 52° 76° 37° (1971) 100° (2006) 2.06" 0"
August 52° 76° 38° (1973) 98° (1981) 1.96" 0"
September 48° 71° 30° (1972) 98° (1988) 4.55" 0"
October 42° 59° 23° (2002) 86° (1980) 11" 0"
November 36° 47° 8° (1985) 70° (1970) 18.94" 4.6"
December 31° 41° 1° (1990) 60° (2002) 13.98" 16.6"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 33° 43° 15° (1985) 60° (2002) 0.54" 0.3"
Dec 2 33° 42° 21° (1985) 57° (1977) 0.55" 0.4"
Dec 3 33° 42° 24° (1972) 56° (1977) 0.53" 0.3"
Dec 4 32° 42° 11° (1972) 54° (1975) 0.52" 0.4"
Dec 5 32° 42° 16° (1972) 54° (1991) 0.51" 0.3"
Dec 6 32° 42° 15° (1972) 53° (1991) 0.5" 0.4"
Dec 7 32° 41° 3° (1972) 51° (2002) 0.49" 0.4"
Dec 8 32° 41° 1° (1972) 49° (2006) 0.47" 0.4"
Dec 9 32° 41° 6° (1972) 52° (1979) 0.46" 0.4"
Dec 10 32° 41° 11° (1972) 48° (1982) 0.45" 0.4"
Dec 11 32° 41° 11° (1972) 50° (1974) 0.44" 0.4"
Dec 12 31° 41° 13° (1972) 50° (1976) 0.44" 0.5"
Dec 13 31° 41° 7° (1972) 55° (1988) 0.43" 0.5"
Dec 14 31° 40° 21° (1972) 55° (1977) 0.42" 0.5"
Dec 15 31° 40° 19° (2008) 51° (1979) 0.43" 0.5"
Dec 16 31° 40° 14° (2008) 51° (1999) 0.41" 0.6"
Dec 17 31° 40° 17° (2008) 53° (2004) 0.42" 0.6"
Dec 18 31° 40° 14° (1984) 49° (2004) 0.4" 0.5"
Dec 19 31° 40° 8° (2008) 56° (2004) 0.42" 0.6"
Dec 20 31° 40° 4° (1990) 52° (2003) 0.41" 0.7"
Dec 21 31° 40° 1° (1990) 54° (1972) 0.43" 0.6"
Dec 22 31° 40° 4° (1983) 53° (1980) 0.44" 0.7"
Dec 23 31° 40° 1° (1983) 50° (1999) 0.43" 0.7"
Dec 24 31° 40° 10° (1983) 48° (2003) 0.43" 0.6"
Dec 25 31° 40° 19° (1987) 56° (1980) 0.45" 0.7"
Dec 26 31° 40° 20° (1970) 58° (1980) 0.44" 0.7"
Dec 27 31° 40° 19° (1971) 54° (1980) 0.43" 0.7"
Dec 28 31° 40° 11° (1978) 54° (1997) 0.43" 0.7"
Dec 29 31° 40° 6° (1990) 53° (1998) 0.42" 0.7"
Dec 30 31° 40° 3° (1978) 50° (1980) 0.42" 0.7"
Dec 31 31° 40° 7° (1978) 49° (1980) 0.42" 0.7"
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