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
Apr 1 36° 63° 19° (1936) 75° (1987) 0.02" NA
Apr 2 36° 63° 14° (1935) 80° (2000) 0.02" NA
Apr 3 37° 63° 18° (1935) 80° (1944) 0.02" NA
Apr 4 37° 63° 22° (1936) 77° (2000) 0.02" NA
Apr 5 37° 64° 23° (1975) 79° (1960) 0.02" NA
Apr 6 37° 64° 23° (1939) 78° (1952) 0.02" NA
Apr 7 37° 64° 24° (1946) 83° (1934) 0.02" NA
Apr 8 37° 64° 25° (1948) 83° (1977) 0.02" NA
Apr 9 37° 65° 25° (1945) 79° (1960) 0.02" NA
Apr 10 38° 65° 23° (1933) 79° (1968) 0.02" NA
Apr 11 38° 65° 26° (1948) 83° (1968) 0.02" NA
Apr 12 38° 65° 25° (1970) 87° (1936) 0.03" NA
Apr 13 38° 66° 22° (1968) 87° (1947) 0.03" NA
Apr 14 38° 66° 24° (2001) 86° (1943) 0.03" NA
Apr 15 39° 66° 22° (1955) 85° (1962) 0.03" NA
Apr 16 39° 66° 23° (1960) 87° (1936) 0.02" NA
Apr 17 39° 67° 25° (1944) 87° (1936) 0.02" NA
Apr 18 39° 67° 24° (1972) 84° (1939) 0.02" NA
Apr 19 39° 67° 26° (1955) 87° (1952) 0.02" NA
Apr 20 40° 67° 25° (1931) 88° (1934) 0.02" NA
Apr 21 40° 68° 24° (1985) 90° (1934) 0.02" NA
Apr 22 40° 68° 25° (1972) 90° (1934) 0.02" NA
Apr 23 40° 68° 26° (1942) 80° (1962) 0.02" NA
Apr 24 41° 68° 24° (1950) 86° (1981) 0.02" NA
Apr 25 41° 69° 28° (1976) 91° (1977) 0.02" NA
Apr 26 41° 69° 24° (1948) 86° (1952) 0.02" NA
Apr 27 41° 69° 25° (1970) 87° (1987) 0.02" NA
Apr 28 41° 70° 28° (1945) 89° (1939) 0.02" NA
Apr 29 42° 70° 25° (1972) 86° (1931) 0.02" NA
Apr 30 42° 70° 28° (1949) 88° (1968) 0.02" NA
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