All-time weather records — Sumner, WA

Record high
102.0°F
July 30, 2009
Record low
-0.9°F
December 23, 1983
Wettest day
3.59 in
November 7, 2006

Climate change signal in Sumner

11.5%

of Sumner's all-time daily heat records were set in the last decade (42 of 366 records since 2015).

2.5%

of all-time daily cold records were set in the last decade (9 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 #
1940s
66
49
1950s
45
98
1960s
54
60
1970s
28
66
1980s
52
59
1990s
39
15
2000s
33
10
2010s
29
2
2020s
20
7

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 1941, the latest in 2025. Period of observation: 1941-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 73.9°F — Jan 27, 1986 0.0°F — Jan 18, 1950 2.50 in — Jan 7, 2009
February 66.9°F — Feb 3, 1962 3.0°F — Feb 1, 1950 2.72 in — Feb 8, 1996
March 79.0°F — Mar 30, 2004 9.0°F — Mar 5, 1955 2.15 in — Mar 27, 2005
April 84.0°F — Apr 18, 2016 23.0°F — Apr 3, 2004 2.60 in — Apr 5, 1991
May 91.9°F — May 18, 2008 0.0°F — May 24, 1999 1.94 in — May 15, 2011
June 99.0°F — Jun 28, 2021 32.0°F — Jun 3, 1976 1.94 in — Jun 2, 1968
July 102.0°F — Jul 30, 2009 36.0°F — Jul 3, 1949 1.78 in — Jul 9, 1946
August 100.0°F — Aug 10, 1981 37.0°F — Aug 29, 1980 2.48 in — Aug 27, 1960
September 95.0°F — Sep 3, 1988 28.9°F — Sep 27, 1972 2.72 in — Sep 6, 2013
October 86.0°F — Oct 2, 1987 21.0°F — Oct 28, 1971 3.07 in — Oct 21, 2003
November 73.0°F — Nov 1, 1949 0.0°F — Nov 15, 1955 3.59 in — Nov 7, 2006
December 66.0°F — Dec 15, 2014 -0.9°F — Dec 23, 1983 2.67 in — Dec 27, 1974

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