All-time weather records — Seymour, IA

Record high
109.9°F
July 5, 1911
Record low
-29.9°F
January 28, 1915
Wettest day
6.70 in
July 17, 1946

Climate change signal in Seymour

7.4%

of Seymour's all-time daily heat records were set in the last decade (27 of 366 records since 2015).

12.3%

of all-time daily cold records were set in the last decade (45 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
40
30
1900s
6
7
1910s
53
44
1920s
22
32
1930s
69
28
1940s
25
37
1950s
22
24
1960s
15
38
1970s
8
22
1980s
34
21
1990s
15
13
2000s
23
6
2010s
20
40
2020s
14
24

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 1893, the latest in 2024. Period of observation: 1893-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 84.9°F — Jan 21, 1894 -29.9°F — Jan 28, 1915 1.75 in — Jan 20, 1895
February 78.1°F — Feb 24, 1930 -24.0°F — Feb 3, 1996 1.78 in — Feb 9, 2001
March 90.0°F — Mar 29, 1895 -17.0°F — Mar 4, 2014 3.20 in — Mar 16, 1919
April 90.0°F — Apr 6, 1922 6.1°F — Apr 5, 1920 6.12 in — Apr 18, 2013
May 100.9°F — May 30, 1934 27.0°F — May 3, 2023 4.18 in — May 29, 2019
June 104.0°F — Jun 25, 1988 39.0°F — Jun 8, 1913 4.82 in — Jun 18, 1946
July 109.9°F — Jul 5, 1911 45.0°F — Jul 4, 1967 6.70 in — Jul 17, 1946
August 109.9°F — Aug 9, 1934 39.0°F — Aug 30, 1915 5.60 in — Aug 24, 2007
September 106.0°F — Sep 4, 1913 23.0°F — Sep 28, 1942 5.35 in — Sep 26, 1933
October 93.9°F — Oct 5, 1920 0.0°F — Oct 30, 1925 4.25 in — Oct 5, 1954
November 81.0°F — Nov 1, 1938 -11.0°F — Nov 30, 1964 2.83 in — Nov 20, 1930
December 73.9°F — Dec 16, 2021 -27.9°F — Dec 28, 1924 2.50 in — Dec 1, 1894

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