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
Aug 1 56° 91° 44° (1937) 105° (1971) 0.01" NA
Aug 2 56° 91° 41° (1956) 104° (1971) 0.01" NA
Aug 3 56° 91° 44° (1950) 101° (2007) 0.01" NA
Aug 4 56° 91° 42° (1950) 102° (1998) 0.01" NA
Aug 5 56° 91° 41° (1948) 106° (1998) 0.01" NA
Aug 6 56° 91° 41° (1969) 104° (1998) 0.01" NA
Aug 7 55° 91° 42° (1938) 102° (1997) 0.01" NA
Aug 8 55° 91° 42° (1938) 103° (1972) 0.01" NA
Aug 9 55° 91° 44° (1954) 100° (1942) 0.01" NA
Aug 10 55° 91° 43° (1947) 101° (1971) 0.01" NA
Aug 11 55° 91° 45° (1932) 103° (1971) 0.01" NA
Aug 12 55° 91° 42° (1938) 102° (1971) 0.01" NA
Aug 13 55° 90° 40° (1949) 103° (1992) 0.01" NA
Aug 14 55° 90° 41° (1937) 103° (2001) 0.01" NA
Aug 15 55° 90° 40° (1937) 102° (1933) 0.01" NA
Aug 16 55° 90° 41° (1935) 102° (1933) 0.01" NA
Aug 17 54° 90° 41° (1973) 102° (1967) 0.01" NA
Aug 18 54° 90° 39° (1973) 102° (1967) 0.01" NA
Aug 19 54° 89° 39° (2000) 103° (1942) 0.01" NA
Aug 20 54° 89° 36° (2000) 101° (1977) 0.01" NA
Aug 21 54° 89° 40° (1947) 100° (1977) 0.01" NA
Aug 22 54° 89° 37° (1960) 100° (1946) 0.01" NA
Aug 23 53° 89° 42° (1943) 98° (1956) 0.01" NA
Aug 24 53° 88° 39° (2001) 99° (1931) 0.01" NA
Aug 25 53° 88° 38° (1993) 100° (1958) 0.01" NA
Aug 26 53° 88° 40° (1976) 97° (1958) 0.01" NA
Aug 27 53° 87° 38° (1960) 95° (1938) 0.01" NA
Aug 28 52° 87° 38° (1980) 98° (1999) 0.02" NA
Aug 29 52° 87° 37° (1969) 100° (1972) 0.02" NA
Aug 30 52° 86° 40° (1965) 100° (1998) 0.02" NA
Aug 31 52° 86° 39° (1973) 101° (1986) 0.02" NA
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