Mattawa, Washington
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 29° 41° -12° (1996) 71° (1971) 1.02" 2.2"
February 32° 47° -10° (1996) 72° (1986) 0.69" 0.3"
March 38° 58° 11° (1993) 82° (1960) 0.63" 0"
April 44° 66° 25° (1964) 94° (1977) 0.53" 0"
May 52° 75° 30° (1989) 105° (1986) 0.45" 0"
June 59° 82° 35° (1973) 110° (1961) 0.45" 0"
July 66° 91° 47° (1996) 112° (2006) 0.22" 0"
August 65° 90° 42° (1999) 110° (1972) 0.15" 0"
September 56° 80° 33° (1996) 105° (1998) 0.27" 0"
October 45° 65° 18° (1984) 87° (1993) 0.52" 0"
November 35° 50° -7° (1985) 76° (1999) 1.1" 0.2"
December 28° 39° -7° (1968) 71° (1980) 1.41" 0.9"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Sep 1 61° 86° 47° (1980) 101° (1998) 0.01" 0"
Sep 2 61° 85° 49° (1973) 105° (1998) 0" 0"
Sep 3 61° 85° 41° (2000) 99° (1988) 0.01" 0"
Sep 4 60° 85° 45° (1980) 101° (2003) 0.01" 0"
Sep 5 60° 84° 45° (1961) 100° (1966) 0" 0"
Sep 6 60° 84° 42° (1961) 99° (1962) 0.01" 0"
Sep 7 59° 84° 45° (1992) 98° (1957) 0.01" 0"
Sep 8 59° 83° 46° (1962) 96° (1963) 0.01" 0"
Sep 9 59° 83° 43° (1962) 100° (1963) 0.01" 0"
Sep 10 58° 83° 45° (1982) 93° (1963) 0" 0"
Sep 11 58° 82° 45° (1988) 98° (1973) 0.01" 0"
Sep 12 58° 82° 44° (1988) 94° (1957) 0.01" 0"
Sep 13 57° 82° 45° (1970) 97° (2009) 0.01" 0"
Sep 14 57° 81° 42° (1962) 94° (1960) 0.01" 0"
Sep 15 57° 81° 39° (1970) 93° (1975) 0.01" 0"
Sep 16 56° 80° 42° (1992) 96° (1957) 0.01" 0"
Sep 17 56° 80° 38° (1965) 95° (1981) 0.01" 0"
Sep 18 56° 80° 37° (1965) 95° (1981) 0.01" 0"
Sep 19 55° 79° 37° (1957) 92° (1979) 0.01" 0"
Sep 20 55° 79° 40° (1985) 92° (1967) 0.01" 0"
Sep 21 54° 78° 40° (1988) 94° (1967) 0.01" 0"
Sep 22 54° 78° 37° (1981) 91° (1966) 0.01" 0"
Sep 23 54° 77° 38° (1993) 91° (2009) 0.01" 0"
Sep 24 53° 77° 37° (1958) 91° (2009) 0.01" 0"
Sep 25 53° 76° 33° (1996) 91° (1957) 0.01" 0"
Sep 26 52° 76° 38° (2000) 95° (1957) 0.01" 0"
Sep 27 52° 75° 40° (1996) 88° (1963) 0.01" 0"
Sep 28 51° 75° 39° (1985) 92° (1996) 0.01" 0"
Sep 29 51° 74° 39° (1971) 93° (1963) 0.01" 0"
Sep 30 51° 74° 42° (1985) 90° (1996) 0.01" 0"
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