All-time weather records — Deep River, IA

Record high
100.0°F
July 12, 1939
Record low
-20.0°F
January 18, 1940
Wettest day
6.37 in
August 5, 1970

Climate change signal in Deep River

0%

of Deep River's all-time daily heat records were set in the last decade (0 of 366 records since 2015).

0%

of all-time daily cold records were set in the last decade (0 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
·
·
1900s
·
·
1930s
355
322
1940s
11
44
1950s
·
·
1960s
·
·
1970s
·
·
1980s
·
·
1990s
·
·
2000s
·
·
2010s
·
·
2020s
·
·

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 1937, the latest in 1940. Period of observation: 1896-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 57.9°F — Jan 9, 1939 -20.0°F — Jan 18, 1940 1.73 in — Jan 12, 1960
February 60.1°F — Feb 13, 1938 -9.9°F — Feb 25, 1940 1.42 in — Feb 23, 1981
March 84.9°F — Mar 21, 1938 5.0°F — Mar 7, 1939 3.42 in — Mar 6, 1959
April 84.9°F — Apr 24, 1939 17.1°F — Apr 12, 1939 4.42 in — Apr 14, 2014
May 96.1°F — May 24, 1939 34.0°F — May 11, 1939 3.96 in — May 26, 2013
June 95.0°F — Jun 24, 1938 46.0°F — Jun 8, 1938 4.70 in — Jun 17, 1990
July 100.0°F — Jul 12, 1939 55.0°F — Jul 30, 1939 4.43 in — Jul 5, 1993
August 100.0°F — Aug 16, 1937 51.1°F — Aug 9, 1939 6.37 in — Aug 5, 1970
September 100.0°F — Sep 7, 1939 32.0°F — Sep 30, 1939 6.10 in — Sep 13, 1961
October 91.9°F — Oct 4, 1938 19.9°F — Oct 14, 1937 3.08 in — Oct 9, 1982
November 80.1°F — Nov 1, 1938 -0.9°F — Nov 21, 1937 3.10 in — Nov 4, 1938
December 64.0°F — Dec 16, 1939 -6.0°F — Dec 31, 1939 4.06 in — Dec 21, 2009

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