All-time weather records — Prosser, WA

Record high
114.1°F
June 30, 2021
Record low
-20.0°F
January 21, 1930
Wettest day
8.00 in
January 1, 1927

Climate change signal in Prosser

14.8%

of Prosser's all-time daily heat records were set in the last decade (54 of 366 records since 2015).

3.3%

of all-time daily cold records were set in the last decade (12 of 366 records since 2015).

If records were spread evenly across the station's history, you'd expect roughly 5% per decade. Decade-by-decade, here's where each record-breaking day was set:

Decade Heat records set # Cold records set #
1920s
15
29
1930s
69
66
1940s
32
47
1950s
20
43
1960s
35
30
1970s
25
52
1980s
30
27
1990s
24
18
2000s
46
22
2010s
35
28
2020s
35
4

Records are the all-time daily extremes that are still standing — each daily record can only be held by one year. The station's earliest hot record was set in 1926, the latest in 2025. Period of observation: 1925-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 69.1°F — Jan 31, 1971 -20.0°F — Jan 21, 1930 8.00 in — Jan 1, 1927
February 72.0°F — Feb 8, 2002 -20.0°F — Feb 3, 1950 1.01 in — Feb 2, 1961
March 81.0°F — Mar 26, 1960 6.1°F — Mar 5, 1955 1.00 in — Mar 9, 2026
April 91.0°F — Apr 25, 1977 12.0°F — Apr 5, 1930 0.89 in — Apr 24, 1974
May 100.0°F — May 24, 2001 25.0°F — May 2, 1999 1.49 in — May 13, 2015
June 114.1°F — Jun 30, 2021 30.0°F — Jun 30, 2011 1.70 in — Jun 6, 1957
July 111.0°F — Jul 14, 2002 30.9°F — Jul 23, 2012 0.69 in — Jul 3, 1978
August 106.0°F — Aug 2, 2009 36.0°F — Aug 20, 2000 0.91 in — Aug 30, 1947
September 108.0°F — Sep 1, 1986 21.0°F — Sep 24, 2000 0.98 in — Sep 24, 1986
October 91.9°F — Oct 19, 1996 10.9°F — Oct 30, 1935 1.67 in — Oct 2, 1957
November 80.1°F — Nov 12, 1987 -18.0°F — Nov 27, 2010 0.83 in — Nov 29, 1926
December 70.0°F — Dec 2, 2021 -13.0°F — Dec 6, 2007 1.50 in — Dec 18, 2007

Click a month to see every daily record for that month in Prosser.