All-time weather records — St. Johns, AZ

Record high
107.1°F
July 18, 2005
Record low
-21.8°F
January 1, 2011
Wettest day
2.47 in
August 4, 2007

Climate change signal in St. Johns

36.1%

of St. Johns's all-time daily heat records were set in the last decade (132 of 366 records since 2015).

29.2%

of all-time daily cold records were set in the last decade (107 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 #
1990s
6
20
2000s
194
156
2010s
87
141
2020s
79
49

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 1999, the latest in 2026. Period of observation: 1999-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 78.1°F — Jan 7, 2003 -21.8°F — Jan 1, 2011 0.46 in — Jan 22, 2010
February 77.0°F — Feb 17, 2016 -9.8°F — Feb 3, 2011 0.58 in — Feb 15, 2018
March 91.0°F — Mar 21, 2026 -1.8°F — Mar 13, 2006 0.76 in — Mar 11, 2018
April 88.0°F — Apr 22, 2012 17.2°F — Apr 11, 2011 0.53 in — Apr 13, 2020
May 99.0°F — May 20, 2005 22.1°F — May 3, 2011 0.64 in — May 22, 2008
June 104.0°F — Jun 13, 2021 32.0°F — Jun 9, 2020 0.56 in — Jun 10, 2019
July 107.1°F — Jul 18, 2005 48.0°F — Jul 2, 2004 1.45 in — Jul 23, 2021
August 100.9°F — Aug 10, 2003 45.0°F — Aug 25, 2002 2.47 in — Aug 4, 2007
September 98.1°F — Sep 6, 2020 28.2°F — Sep 28, 2013 1.14 in — Sep 10, 2002
October 91.9°F — Oct 1, 2003 6.3°F — Oct 31, 2019 0.80 in — Oct 23, 2000
November 82.0°F — Nov 10, 2005 -1.8°F — Nov 30, 2006 1.02 in — Nov 4, 2016
December 81.0°F — Dec 31, 2002 -6.0°F — Dec 13, 2001 0.97 in — Dec 4, 2014

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