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
Apr 1 37° 56° 27° (1975) 80° (1987) 0.32" 0"
Apr 2 37° 56° 28° (1976) 84° (1992) 0.31" 0.1"
Apr 3 37° 56° 27° (1972) 73° (1995) 0.31" 0"
Apr 4 37° 57° 29° (1997) 78° (2004) 0.29" 0.1"
Apr 5 37° 57° 29° (1975) 80° (1977) 0.29" 0"
Apr 6 37° 57° 28° (1982) 77° (1977) 0.29" 0.1"
Apr 7 37° 57° 28° (1973) 82° (1977) 0.28" 0"
Apr 8 37° 57° 28° (1975) 73° (1996) 0.26" 0"
Apr 9 37° 58° 28° (1982) 79° (1985) 0.27" 0.1"
Apr 10 37° 58° 28° (1972) 74° (1988) 0.27" 0"
Apr 11 38° 58° 30° (1997) 82° (2004) 0.26" 0.1"
Apr 12 38° 58° 29° (1971) 83° (2004) 0.25" 0"
Apr 13 38° 58° 29° (1970) 82° (1980) 0.26" 0"
Apr 14 38° 59° 29° (1970) 78° (1984) 0.26" 0.1"
Apr 15 38° 59° 30° (1970) 77° (1990) 0.27" 0"
Apr 16 38° 59° 29° (1972) 80° (1990) 0.27" 0"
Apr 17 38° 59° 30° (1970) 80° (1983) 0.26" 0.1"
Apr 18 38° 60° 29° (1972) 76° (1994) 0.26" 0"
Apr 19 39° 60° 28° (1972) 76° (2010) 0.27" 0"
Apr 20 39° 60° 29° (1977) 77° (1991) 0.24" 0"
Apr 21 39° 60° 28° (2008) 79° (2009) 0.25" 0"
Apr 22 39° 61° 30° (1971) 83° (1982) 0.24" 0.1"
Apr 23 39° 61° 32° (1972) 79° (1977) 0.24" 0"
Apr 24 39° 61° 28° (1986) 80° (1977) 0.24" 0"
Apr 25 40° 61° 28° (1986) 82° (1992) 0.24" 0"
Apr 26 40° 62° 30° (1984) 84° (1987) 0.23" 0"
Apr 27 40° 62° 32° (1984) 87° (1987) 0.23" 0.1"
Apr 28 40° 62° 32° (1973) 76° (1998) 0.23" 0"
Apr 29 40° 62° 29° (1975) 83° (1998) 0.22" 0"
Apr 30 40° 63° 29° (1972) 91° (1998) 0.22" 0"
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