All-time weather records — Mattawa, WA

Record high
116.1°F
July 5, 2015
Record low
-11.9°F
January 31, 1996
Wettest day
24.05 in
January 23, 1982

Climate change signal in Mattawa

15.8%

of Mattawa's all-time daily heat records were set in the last decade (58 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 #
1950s
24
22
1960s
68
74
1970s
49
63
1980s
54
87
1990s
61
79
2000s
31
23
2010s
43
15
2020s
36
3

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 1956, the latest in 2026. Period of observation: 1956-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 71.1°F — Jan 31, 1971 -11.9°F — Jan 31, 1996 24.05 in — Jan 23, 1982
February 72.0°F — Feb 24, 1986 -9.9°F — Feb 2, 1996 1.00 in — Mar 1, 2000
March 82.0°F — Mar 25, 1960 10.9°F — Mar 1, 1962 1.02 in — Mar 23, 1967
April 93.9°F — Apr 24, 1977 25.0°F — Apr 4, 1964 1.07 in — Apr 28, 1995
May 105.1°F — May 30, 1986 28.9°F — May 20, 1991 1.30 in — May 13, 2015
June 113.0°F — Jun 30, 2021 26.1°F — Jun 13, 1991 1.00 in — Jun 20, 1991
July 116.1°F — Jul 5, 2015 46.9°F — Jul 1, 1991 0.98 in — Jul 18, 1987
August 109.9°F — Aug 4, 1961 42.1°F — Aug 31, 1999 0.88 in — Aug 30, 1977
September 105.1°F — Sep 2, 1998 33.1°F — Sep 25, 1996 0.68 in — Sep 13, 1980
October 91.9°F — Oct 5, 2001 18.0°F — Oct 29, 1971 0.97 in — Oct 2, 1957
November 75.9°F — Nov 12, 1999 -7.1°F — Nov 23, 1985 1.35 in — Nov 19, 1996
December 71.1°F — Dec 26, 1980 -7.1°F — Dec 30, 1968 1.50 in — Dec 2, 2015

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