All-time weather records — Riverton, IA

Record high
109.0°F
July 21, 1974
Record low
-27.9°F
February 11, 1899
Wettest day
8.75 in
July 19, 1965

Climate change signal in Riverton

4.9%

of Riverton's all-time daily heat records were set in the last decade (18 of 366 records since 2015).

4.1%

of all-time daily cold records were set in the last decade (15 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
21
30
1900s
1
7
1940s
6
1
1950s
61
55
1960s
41
64
1970s
56
43
1980s
71
45
1990s
27
58
2000s
43
25
2010s
39
38

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 1895, the latest in 2017. Period of observation: 1895-2018.

Records by month

Month Hottest day Coldest day Wettest day
January 69.1°F — Jan 24, 1981 -22.0°F — Jan 29, 1966 1.24 in — Jan 3, 1971
February 82.0°F — Mar 1, 1972 -27.9°F — Feb 11, 1899 2.12 in — Feb 19, 1954
March 91.0°F — Mar 29, 1986 -17.0°F — Mar 1, 1962 1.74 in — Mar 31, 1973
April 96.1°F — Apr 22, 1989 8.1°F — Apr 3, 1975 2.94 in — Apr 17, 1978
May 100.0°F — May 29, 1989 28.0°F — May 3, 1976 4.48 in — May 26, 1987
June 105.1°F — Jun 27, 1980 41.0°F — Jun 4, 1998 4.06 in — Jun 5, 2008
July 109.0°F — Jul 21, 1974 44.1°F — Jul 30, 1971 8.75 in — Jul 19, 1965
August 102.9°F — Aug 14, 1988 42.1°F — Aug 20, 1950 5.24 in — Aug 9, 2015
September 102.0°F — Sep 1, 1975 28.0°F — Sep 22, 1995 4.16 in — Sep 9, 1989
October 93.9°F — Oct 1, 1956 14.0°F — Oct 27, 1997 4.29 in — Oct 15, 2007
November 84.0°F — Nov 17, 1895 -9.0°F — Nov 30, 1964 2.21 in — Nov 4, 2003
December 72.0°F — Dec 23, 1964 -25.1°F — Dec 23, 1989 2.10 in — Dec 13, 2015

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