All-time weather records — Alton, UT

Record high
100.9°F
July 10, 2021
Record low
-24.0°F
December 22, 1990
Wettest day
3.55 in
March 3, 1938

Climate change signal in Alton

23.5%

of Alton's all-time daily heat records were set in the last decade (86 of 366 records since 2015).

4.6%

of all-time daily cold records were set in the last decade (17 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 #
1910s
6
33
1920s
8
32
1930s
8
38
1940s
11
47
1950s
50
34
1960s
37
38
1970s
21
52
1980s
38
28
1990s
21
27
2000s
64
13
2010s
53
12
2020s
49
12

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 1917, the latest in 2026. Period of observation: 1915-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 64.0°F — Jan 9, 1990 -20.0°F — Jan 30, 1979 2.28 in — Jan 25, 1969
February 68.0°F — Feb 25, 1986 -17.0°F — Feb 10, 1933 1.96 in — Feb 9, 1976
March 81.0°F — Mar 20, 2026 -7.1°F — Mar 4, 1966 3.55 in — Mar 3, 1938
April 81.0°F — Apr 23, 2012 -2.0°F — Apr 1, 1920 1.16 in — Apr 29, 1917
May 90.0°F — May 30, 2002 5.0°F — May 3, 1915 1.85 in — May 28, 1934
June 96.1°F — Jun 28, 2013 23.0°F — Jun 2, 1955 1.72 in — Jun 26, 1952
July 100.9°F — Jul 10, 2021 1.0°F — Jul 3, 2011 1.78 in — Jul 22, 1966
August 97.0°F — Aug 18, 2020 19.9°F — Aug 15, 1986 2.05 in — Aug 29, 1951
September 93.0°F — Sep 4, 2020 19.9°F — Sep 18, 1965 2.40 in — Sep 19, 1972
October 99.0°F — Oct 7, 1984 -2.0°F — Oct 30, 1971 2.90 in — Oct 21, 2004
November 78.1°F — Nov 13, 2015 -5.1°F — Nov 23, 1931 3.50 in — Nov 24, 2010
December 66.9°F — Dec 9, 1962 -24.0°F — Dec 22, 1990 3.21 in — Dec 6, 1966

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