All-time weather records — Boulder, UT

Record high
97.0°F
June 16, 2021
Record low
-17.0°F
February 6, 1989
Wettest day
2.88 in
October 6, 2006

Climate change signal in Boulder

14.8%

of Boulder's all-time daily heat records were set in the last decade (54 of 366 records since 2015).

2.5%

of all-time daily cold records were set in the last decade (9 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 #
1950s
23
57
1960s
41
99
1970s
55
74
1980s
55
46
1990s
79
40
2000s
51
33
2010s
23
12
2020s
39
5

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 1954, the latest in 2026. Period of observation: 1954-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 63.0°F — Jan 25, 1975 -16.1°F — Jan 12, 1963 1.51 in — Jan 13, 1997
February 69.1°F — Feb 15, 1996 -17.0°F — Feb 6, 1989 1.21 in — Feb 14, 1980
March 80.1°F — Mar 21, 2026 0.0°F — Mar 4, 1966 1.31 in — Mar 4, 1969
April 82.0°F — Apr 30, 1981 8.1°F — Apr 2, 1975 1.50 in — Apr 3, 1964
May 89.1°F — May 23, 2000 19.9°F — May 18, 1977 1.20 in — May 15, 2003
June 97.0°F — Jun 16, 2021 23.0°F — Jun 8, 2000 1.65 in — Jun 29, 1956
July 96.1°F — Jul 6, 1989 32.0°F — Jul 4, 2000 2.33 in — Jul 20, 1969
August 95.0°F — Aug 12, 2002 23.0°F — Aug 5, 1991 1.62 in — Aug 13, 2009
September 93.0°F — Sep 6, 2020 24.1°F — Sep 18, 1971 2.20 in — Sep 23, 2016
October 84.9°F — Oct 14, 2020 3.9°F — Oct 30, 1971 2.88 in — Oct 6, 2006
November 71.1°F — Nov 24, 2017 -0.9°F — Nov 28, 1976 1.85 in — Nov 11, 1978
December 64.9°F — Dec 12, 1958 -11.0°F — Dec 8, 1978 1.25 in — Dec 26, 2003

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