All-time weather records — Mill Creek, WA

Record high
100.0°F
June 28, 2021
Record low
0.0°F
October 21, 1998
Wettest day
3.21 in
June 13, 1948

Climate change signal in Mill Creek

47.5%

of Mill Creek's all-time daily heat records were set in the last decade (174 of 366 records since 2015).

10.1%

of all-time daily cold records were set in the last decade (37 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
19
100
1950s
19
109
1990s
8
20
2000s
104
71
2010s
126
46
2020s
90
20

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 1948, the latest in 2026. Period of observation: 1948-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 64.9°F — Jan 29, 2024 3.0°F — Jan 25, 1950 1.69 in — Jan 21, 2016
February 82.9°F — Feb 6, 2013 9.0°F — Feb 1, 1950 2.04 in — Feb 21, 1949
March 78.1°F — Mar 19, 2019 21.2°F — Mar 10, 2009 1.72 in — Mar 15, 2015
April 82.9°F — Apr 18, 2016 30.9°F — Apr 3, 1948 1.29 in — Apr 2, 2026
May 88.0°F — May 17, 2008 34.0°F — May 7, 2002 1.76 in — May 28, 1948
June 100.0°F — Jun 28, 2021 39.9°F — Jun 12, 1952 3.21 in — Jun 13, 1948
July 100.0°F — Jul 29, 2009 41.0°F — Jul 2, 1950 0.96 in — Jul 23, 2014
August 100.0°F — Aug 16, 2020 46.0°F — Aug 23, 1951 1.47 in — Aug 29, 2013
September 89.1°F — Sep 16, 2025 37.0°F — Sep 24, 1948 1.63 in — Sep 26, 1948
October 87.1°F — Oct 16, 2022 0.0°F — Oct 21, 1998 1.79 in — Oct 20, 2003
November 73.0°F — Nov 2, 1949 14.2°F — Nov 23, 2010 1.85 in — Nov 19, 2012
December 62.1°F — Dec 10, 2014 10.2°F — Dec 20, 2008 2.86 in — Dec 3, 2007

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