All-time weather records — Hamilton, WA

Record high
99.0°F
March 11, 2023
Record low
-2.0°F
January 26, 1957
Wettest day
4.01 in
November 18, 1911

Climate change signal in Hamilton

7.7%

of Hamilton's all-time daily heat records were set in the last decade (28 of 366 records since 2015).

1.6%

of all-time daily cold records were set in the last decade (6 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 #
1890s
20
16
1900s
47
117
1910s
66
63
1920s
24
28
1930s
32
28
1940s
34
15
1950s
22
44
1960s
28
15
1970s
19
9
1980s
16
11
1990s
8
6
2000s
20
7
2010s
16
3
2020s
14
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 1896, the latest in 2025. Period of observation: 1896-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 68.0°F — Jan 27, 2015 -2.0°F — Jan 26, 1957 3.23 in — Jan 22, 1935
February 73.9°F — Feb 28, 1986 -0.9°F — Feb 1, 1950 3.32 in — Feb 16, 1949
March 99.0°F — Mar 11, 2023 8.1°F — Mar 4, 1955 2.90 in — Mar 9, 1916
April 93.9°F — Apr 23, 1910 25.0°F — Apr 2, 1901 2.25 in — Apr 14, 2000
May 95.0°F — May 31, 1910 25.0°F — May 5, 1906 2.22 in — May 20, 1912
June 99.0°F — Jun 30, 1915 30.0°F — Jun 16, 1908 2.50 in — Jun 12, 2001
July 98.1°F — Jul 30, 2009 30.9°F — Jul 11, 1901 3.21 in — Jul 14, 2011
August 97.0°F — Aug 9, 1960 34.0°F — Aug 24, 1910 2.72 in — Aug 22, 2004
September 91.0°F — Sep 5, 1944 28.0°F — Sep 25, 1908 3.29 in — Sep 1, 2016
October 86.0°F — Oct 2, 1987 19.9°F — Oct 30, 1935 2.97 in — Oct 25, 1945
November 75.9°F — Nov 2, 1908 3.0°F — Nov 14, 1955 4.01 in — Nov 18, 1911
December 73.9°F — Dec 5, 1939 0.0°F — Dec 24, 2023 2.45 in — Dec 25, 1967

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