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
Jul 1 53° 86° 39° (1955) 99° (1942) 0.01" NA
Jul 2 54° 86° 38° (1955) 102° (1942) 0.01" NA
Jul 3 54° 87° 40° (1971) 103° (1942) 0.01" NA
Jul 4 54° 87° 40° (1977) 101° (2006) 0.01" NA
Jul 5 54° 87° 40° (1977) 106° (2007) 0.01" NA
Jul 6 54° 88° 38° (1971) 104° (1975) 0.01" NA
Jul 7 54° 88° 37° (1971) 105° (1968) 0.01" NA
Jul 8 54° 88° 40° (1981) 99° (1953) 0.01" NA
Jul 9 54° 88° 42° (1983) 102° (1968) 0.01" NA
Jul 10 55° 88° 42° (1972) 103° (1975) 0.01" NA
Jul 11 55° 89° 40° (1971) 102° (2001) 0.01" NA
Jul 12 55° 89° 38° (1943) 107° (2002) 0.01" NA
Jul 13 55° 89° 40° (1969) 110° (2002) 0.01" NA
Jul 14 55° 89° 43° (1969) 111° (2002) 0.01" NA
Jul 15 55° 89° 41° (1982) 105° (1938) 0.01" NA
Jul 16 55° 90° 40° (1939) 105° (1941) 0.01" NA
Jul 17 55° 90° 41° (1942) 107° (1941) 0.01" NA
Jul 18 55° 90° 43° (1962) 103° (1941) 0.01" NA
Jul 19 55° 90° 44° (1932) 103° (1960) 0" NA
Jul 20 55° 90° 44° (1949) 104° (1931) 0" NA
Jul 21 55° 90° 44° (1984) 105° (1938) 0" NA
Jul 22 55° 91° 40° (1982) 105° (1938) 0" NA
Jul 23 55° 91° 43° (1973) 104° (1998) 0" NA
Jul 24 55° 91° 42° (1948) 108° (2006) 0" NA
Jul 25 56° 91° 44° (1949) 104° (2006) 0" NA
Jul 26 56° 91° 43° (1969) 107° (1939) 0.01" NA
Jul 27 56° 91° 44° (1969) 110° (1939) 0.01" NA
Jul 28 56° 91° 42° (1959) 108° (1998) 0.01" NA
Jul 29 56° 91° 43° (2001) 107° (1998) 0.01" NA
Jul 30 56° 91° 42° (1945) 103° (2003) 0.01" NA
Jul 31 56° 91° 43° (1937) 104° (2003) 0.01" NA
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