All-time weather records — Cortez, CO

Record high
102.0°F
June 16, 2021
Record low
-31.0°F
February 8, 1933
Wettest day
2.56 in
September 10, 2003

Climate change signal in Cortez

36.9%

of Cortez's all-time daily heat records were set in the last decade (135 of 366 records since 2015).

1.6%

of all-time daily cold records were set in the last decade (6 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
2
63
1920s
·
6
1930s
40
87
1940s
25
33
1950s
32
34
1960s
8
37
1970s
14
35
1980s
18
27
1990s
18
29
2000s
57
5
2010s
60
7
2020s
92
3

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 1912, the latest in 2026. Period of observation: 1911-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 63.0°F — Jan 21, 1994 -27.0°F — Jan 12, 1963 1.19 in — Jan 27, 2013
February 79.0°F — Feb 26, 1986 -31.0°F — Feb 8, 1933 1.20 in — Feb 3, 1916
March 86.0°F — Mar 22, 2026 -15.0°F — Mar 6, 1935 1.50 in — Mar 6, 1995
April 88.0°F — Apr 18, 1932 6.1°F — Apr 4, 1945 1.26 in — Apr 28, 1952
May 95.0°F — May 17, 1932 15.1°F — May 25, 1990 1.19 in — May 8, 1957
June 102.0°F — Jun 16, 2021 27.0°F — Jun 5, 1937 1.33 in — Jun 18, 1949
July 102.0°F — Jul 7, 2017 21.9°F — Jul 21, 1915 1.64 in — Jul 17, 2018
August 100.0°F — Aug 22, 2025 28.9°F — Aug 6, 1915 1.82 in — Aug 7, 2006
September 99.0°F — Sep 3, 2022 23.0°F — Sep 26, 1930 2.56 in — Sep 10, 2003
October 90.0°F — Oct 1, 2024 7.0°F — Oct 31, 2019 2.00 in — Oct 3, 1913
November 75.0°F — Nov 6, 2020 -14.1°F — Nov 24, 1931 1.62 in — Nov 16, 1964
December 66.9°F — Dec 23, 2025 -22.0°F — Dec 8, 1978 1.17 in — Dec 11, 1954

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