All-time weather records — Los Altos Hills, CA

Record high
109.0°F
July 14, 2023
Record low
-52.1°F
August 17, 2023
Wettest day
5.67 in
December 11, 2014

Climate change signal in Los Altos Hills

54.9%

of Los Altos Hills's all-time daily heat records were set in the last decade (201 of 366 records since 2015).

24.6%

of all-time daily cold records were set in the last decade (90 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
18
64
2000s
92
146
2010s
152
101
2020s
104
55

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 1997, the latest in 2026. Period of observation: 1995-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 78.1°F — Jan 26, 2015 21.9°F — Jan 14, 1997 4.28 in — Jan 5, 2008
February 79.0°F — Feb 4, 2026 27.0°F — Feb 23, 2018 5.20 in — Feb 3, 1998
March 84.0°F — Mar 25, 2025 23.0°F — Mar 1, 2011 3.51 in — Mar 5, 2016
April 87.1°F — Apr 7, 2022 25.0°F — Apr 2, 1997 2.75 in — Apr 13, 2003
May 97.0°F — May 30, 2025 33.1°F — May 10, 2022 1.76 in — May 16, 1996
June 98.1°F — Jun 29, 2009 37.0°F — Jun 3, 1999 1.07 in — Jun 29, 2011
July 109.0°F — Jul 14, 2023 42.1°F — Jul 4, 1999 0.20 in — Jul 19, 2001
August 98.1°F — Aug 5, 1998 -52.1°F — Aug 17, 2023 1.67 in — Aug 19, 2023
September 104.0°F — Sep 2, 2017 39.9°F — Sep 20, 2007 0.89 in — Sep 18, 2022
October 102.0°F — Oct 2, 2024 35.1°F — Oct 31, 2006 4.21 in — Oct 14, 2009
November 88.0°F — Nov 4, 2025 7.0°F — Nov 10, 1998 4.43 in — Nov 30, 2012
December 79.0°F — Dec 1, 2021 18.0°F — Dec 21, 1998 5.67 in — Dec 11, 2014

Click a month to see every daily record for that month in Los Altos Hills.