All-time weather records — Mammoth, AZ

Record high
109.9°F
June 16, 2021
Record low
3.9°F
February 3, 2011
Wettest day
4.83 in
July 14, 2021

Climate change signal in Mammoth

80.3%

of Mammoth's all-time daily heat records were set in the last decade (294 of 366 records since 2015).

64.5%

of all-time daily cold records were set in the last decade (236 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 #
2010s
187
266
2020s
179
100

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 2010, the latest in 2026. Period of observation: 2010-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 77.0°F — Jan 4, 2025 8.1°F — Jan 1, 2011 1.25 in — Jan 1, 2022
February 82.0°F — Feb 10, 2017 3.9°F — Feb 3, 2011 1.60 in — Feb 15, 2018
March 97.0°F — Mar 20, 2026 18.0°F — Mar 1, 2021 1.60 in — Mar 9, 2013
April 97.0°F — Apr 30, 2020 23.0°F — Apr 5, 2023 1.30 in — Apr 26, 2015
May 104.0°F — May 30, 2020 25.0°F — May 1, 2018 0.46 in — May 5, 2015
June 109.9°F — Jun 16, 2021 33.1°F — Jun 17, 2018 1.91 in — Jun 30, 2016
July 109.0°F — Jul 26, 2023 37.9°F — Jul 9, 2018 4.83 in — Jul 14, 2021
August 106.0°F — Aug 20, 2020 55.9°F — Aug 10, 2016 4.50 in — Aug 13, 2017
September 104.0°F — Sep 5, 2020 32.0°F — Sep 8, 2018 2.60 in — Sep 8, 2014
October 100.0°F — Oct 2, 2024 21.0°F — Oct 31, 2019 1.20 in — Oct 14, 2018
November 88.0°F — Nov 27, 2017 14.0°F — Nov 30, 2010 1.82 in — Nov 21, 2019
December 80.1°F — Dec 23, 2025 10.9°F — Dec 31, 2010 1.49 in — Dec 23, 2023

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