All-time weather records — Flagstaff, AZ

Record high
99.0°F
July 28, 1898
Record low
-29.9°F
January 22, 1937
Wettest day
3.93 in
February 19, 1993

Climate change signal in Flagstaff

21.6%

of Flagstaff's all-time daily heat records were set in the last decade (79 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 #
1890s
46
18
1900s
1
5
1920s
8
22
1930s
26
43
1940s
10
13
1950s
28
48
1960s
13
56
1970s
48
74
1980s
52
28
1990s
21
25
2000s
27
15
2010s
27
12
2020s
59
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 1893, the latest in 2026. Period of observation: 1893-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 66.0°F — Jan 30, 1971 -29.9°F — Jan 22, 1937 3.39 in — Jan 21, 2010
February 71.1°F — Feb 26, 1986 -23.1°F — Feb 1, 1985 3.93 in — Feb 19, 1993
March 84.0°F — Mar 19, 2026 -16.1°F — Mar 4, 1966 2.81 in — Mar 1, 1970
April 82.9°F — Apr 27, 1898 -2.0°F — Apr 2, 1975 1.80 in — Apr 16, 1934
May 93.0°F — May 27, 1896 14.0°F — May 6, 1975 1.11 in — May 24, 1965
June 96.1°F — Jun 26, 1970 21.9°F — Jun 2, 1951 2.40 in — Jun 29, 1956
July 99.0°F — Jul 28, 1898 32.0°F — Jul 5, 1955 2.55 in — Jul 15, 1964
August 95.0°F — Aug 12, 1940 24.1°F — Aug 23, 1968 3.04 in — Aug 13, 1986
September 91.0°F — Sep 6, 2020 21.9°F — Sep 26, 1934 2.84 in — Sep 5, 1970
October 84.9°F — Oct 1, 1980 -2.0°F — Oct 30, 1971 2.42 in — Oct 24, 1992
November 73.9°F — Nov 3, 1977 -13.0°F — Nov 18, 1958 3.21 in — Nov 11, 1978
December 68.0°F — Dec 11, 1950 -23.1°F — Dec 8, 1978 3.33 in — Dec 29, 2004

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