All-time weather records — Delta, UT

Record high
109.9°F
July 13, 2002
Record low
-29.9°F
December 23, 1990
Wettest day
4.39 in
August 18, 2021

Climate change signal in Delta

22.7%

of Delta's all-time daily heat records were set in the last decade (83 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 #
1930s
19
10
1940s
17
35
1950s
23
35
1960s
7
37
1970s
29
63
1980s
30
23
1990s
49
33
2000s
81
84
2010s
37
39
2020s
74
7

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 1938, the latest in 2026. Period of observation: 1938-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 64.0°F — Jan 9, 1953 -25.1°F — Jan 6, 1971 0.67 in — Jan 3, 1997
February 73.9°F — Feb 28, 1972 -27.0°F — Feb 7, 1989 0.89 in — Feb 12, 1949
March 87.8°F — Mar 25, 2026 -8.0°F — Mar 4, 1966 0.96 in — Mar 15, 1945
April 93.9°F — Apr 23, 2012 12.0°F — Apr 5, 1997 1.22 in — Apr 22, 1957
May 105.1°F — May 26, 2008 15.1°F — May 2, 2008 1.21 in — May 11, 1947
June 107.1°F — Jun 18, 2021 25.0°F — Jun 13, 2001 1.08 in — Jun 17, 1939
July 109.9°F — Jul 13, 2002 37.0°F — Jul 2, 1992 1.05 in — Jul 8, 1982
August 109.9°F — Aug 1, 1938 35.1°F — Aug 27, 1992 4.39 in — Aug 18, 2021
September 106.0°F — Sep 6, 2022 21.0°F — Sep 20, 2003 1.45 in — Sep 27, 2014
October 93.0°F — Oct 4, 2024 -2.0°F — Oct 30, 1971 2.59 in — Oct 28, 1946
November 79.0°F — Nov 3, 2025 -13.0°F — Nov 30, 2006 1.04 in — Nov 25, 1978
December 72.0°F — Dec 18, 2025 -29.9°F — Dec 23, 1990 1.60 in — Dec 31, 1951

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