Prosser, Washington
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 25° 41° -18° (1957) 69° (1971) 0.96" NA
February 29° 48° -20° (1950) 69° (1988) 0.7" NA
March 34° 58° 6° (1955) 81° (1960) 0.67" NA
April 39° 66° 14° (1935) 91° (1977) 0.64" NA
May 45° 75° 26° (1954) 100° (2001) 0.65" NA
June 51° 82° 32° (1934) 105° (1992) 0.56" NA
July 55° 89° 37° (1971) 111° (2002) 0.24" NA
August 54° 89° 36° (2000) 106° (1998) 0.35" NA
September 47° 80° 21° (2000) 99° (2003) 0.48" NA
October 38° 68° 11° (1935) 90° (1932) 0.65" NA
November 32° 51° -7° (1985) 76° (1999) 1.03" NA
December 26° 41° -14° (1983) 66° (1987) 1.18" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Sep 1 51° 86° 40° (1971) 99° (1987) 0.01" NA
Sep 2 51° 85° 37° (1932) 97° (1949) 0.01" NA
Sep 3 51° 85° 38° (1958) 96° (1931) 0.01" NA
Sep 4 51° 85° 38° (1969) 98° (1988) 0.01" NA
Sep 5 50° 84° 39° (1956) 99° (2003) 0.01" NA
Sep 6 50° 84° 39° (1961) 97° (1955) 0.01" NA
Sep 7 50° 84° 37° (1976) 99° (1944) 0.01" NA
Sep 8 49° 83° 35° (2001) 96° (1944) 0.01" NA
Sep 9 49° 83° 36° (1970) 96° (1996) 0.01" NA
Sep 10 49° 82° 37° (1972) 95° (1943) 0.01" NA
Sep 11 49° 82° 38° (1936) 97° (1944) 0.01" NA
Sep 12 48° 82° 37° (1949) 93° (1944) 0.01" NA
Sep 13 48° 81° 33° (1936) 95° (2002) 0.02" NA
Sep 14 48° 81° 33° (1936) 94° (1948) 0.02" NA
Sep 15 47° 81° 30° (1936) 94° (1937) 0.02" NA
Sep 16 47° 80° 32° (1936) 95° (1938) 0.02" NA
Sep 17 47° 80° 31° (1965) 91° (1938) 0.02" NA
Sep 18 47° 79° 31° (1965) 92° (1981) 0.02" NA
Sep 19 46° 79° 34° (1971) 93° (1952) 0.02" NA
Sep 20 46° 79° 32° (1983) 91° (1967) 0.02" NA
Sep 21 46° 78° 31° (1971) 92° (1936) 0.02" NA
Sep 22 45° 78° 30° (1996) 95° (1967) 0.02" NA
Sep 23 45° 78° 22° (2000) 92° (1999) 0.02" NA
Sep 24 45° 77° 21° (2000) 92° (1999) 0.02" NA
Sep 25 44° 77° 29° (1933) 93° (2001) 0.02" NA
Sep 26 44° 77° 30° (1972) 91° (1952) 0.02" NA
Sep 27 44° 76° 29° (1972) 90° (1952) 0.02" NA
Sep 28 43° 76° 32° (1945) 88° (2003) 0.02" NA
Sep 29 43° 75° 29° (1971) 90° (1996) 0.02" NA
Sep 30 43° 75° 31° (1933) 89° (1976) 0.02" NA
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