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
Jan 1 30° 39° 12° (1979) 47° (1992) 0.52" NA
Jan 2 30° 39° 17° (1979) 53° (1981) 0.52" NA
Jan 3 30° 39° 16° (1974) 50° (1981) 0.52" NA
Jan 4 30° 39° 15° (2004) 53° (1984) 0.53" NA
Jan 5 30° 39° 13° (2004) 53° (1976) 0.53" NA
Jan 6 30° 39° 3° (1982) 49° (1981) 0.53" NA
Jan 7 31° 39° 14° (1974) 54° (2003) 0.53" NA
Jan 8 31° 40° 16° (1974) 52° (1983) 0.53" NA
Jan 9 31° 40° 14° (1974) 54° (2003) 0.53" NA
Jan 10 31° 40° 13° (1977) 53° (2003) 0.53" NA
Jan 11 31° 40° 10° (1993) 56° (1981) 0.53" NA
Jan 12 31° 40° 15° (1993) 56° (1986) 0.53" NA
Jan 13 31° 40° 16° (2007) 51° (1986) 0.53" NA
Jan 14 31° 40° 16° (2007) 59° (1981) 0.53" NA
Jan 15 31° 40° 20° (1984) 57° (1981) 0.53" NA
Jan 16 31° 40° 19° (1984) 55° (1981) 0.53" NA
Jan 17 31° 40° 19° (1984) 51° (1971) 0.52" NA
Jan 18 31° 40° 18° (1984) 56° (2005) 0.52" NA
Jan 19 31° 41° 20° (1980) 60° (2005) 0.52" NA
Jan 20 31° 41° 22° (1980) 62° (2005) 0.52" NA
Jan 21 31° 41° 27° (1974) 57° (1976) 0.52" NA
Jan 22 31° 41° 26° (1991) 58° (2005) 0.51" NA
Jan 23 31° 41° 24° (1989) 52° (1995) 0.51" NA
Jan 24 31° 41° 25° (1989) 54° (1995) 0.51" NA
Jan 25 31° 42° 22° (1972) 57° (2005) 0.51" NA
Jan 26 31° 42° 14° (1972) 58° (2005) 0.5" NA
Jan 27 31° 42° 7° (1980) 57° (2005) 0.5" NA
Jan 28 31° 42° 4° (1972) 52° (1981) 0.5" NA
Jan 29 31° 42° 5° (1980) 54° (2005) 0.49" NA
Jan 30 31° 43° 8° (1996) 60° (1983) 0.49" NA
Jan 31 31° 43° 16° (1972) 57° (1986) 0.48" NA
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