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
Oct 1 44° 66° 34° (1983) 83° (1988) 0.21" NA
Oct 2 44° 65° 32° (1977) 82° (1980) 0.21" NA
Oct 3 44° 65° 32° (1973) 82° (1979) 0.22" NA
Oct 4 43° 65° 33° (1973) 78° (1980) 0.22" NA
Oct 5 43° 64° 31° (1974) 86° (1980) 0.23" NA
Oct 6 43° 64° 33° (1974) 83° (1987) 0.23" NA
Oct 7 43° 63° 32° (1983) 80° (1976) 0.24" NA
Oct 8 43° 63° 30° (1985) 77° (1971) 0.25" NA
Oct 9 42° 63° 30° (1985) 79° (1979) 0.25" NA
Oct 10 42° 62° 32° (1977) 79° (1991) 0.26" NA
Oct 11 42° 62° 29° (1972) 81° (1987) 0.27" NA
Oct 12 42° 61° 32° (1972) 73° (1982) 0.27" NA
Oct 13 42° 61° 32° (1970) 79° (1986) 0.28" NA
Oct 14 41° 60° 31° (1970) 78° (1978) 0.29" NA
Oct 15 41° 60° 28° (1992) 77° (1986) 0.3" NA
Oct 16 41° 60° 30° (1971) 71° (1970) 0.31" NA
Oct 17 41° 59° 29° (1971) 73° (2002) 0.32" NA
Oct 18 41° 59° 29° (1976) 79° (1978) 0.33" NA
Oct 19 40° 58° 29° (1984) 73° (1978) 0.34" NA
Oct 20 40° 58° 31° (1984) 71° (1987) 0.35" NA
Oct 21 40° 57° 28° (1984) 73° (1998) 0.36" NA
Oct 22 40° 57° 29° (1976) 73° (2003) 0.37" NA
Oct 23 40° 56° 32° (1984) 75° (1986) 0.38" NA
Oct 24 39° 56° 29° (1975) 74° (2007) 0.39" NA
Oct 25 39° 55° 29° (2002) 67° (1983) 0.4" NA
Oct 26 39° 55° 30° (1978) 66° (1998) 0.42" NA
Oct 27 39° 54° 30° (1971) 65° (1973) 0.43" NA
Oct 28 39° 54° 23° (1971) 62° (1987) 0.44" NA
Oct 29 38° 53° 25° (1971) 68° (1983) 0.45" NA
Oct 30 38° 53° 23° (2002) 66° (1970) 0.47" NA
Oct 31 38° 53° 23° (2002) 65° (1988) 0.48" NA
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