Weather on December 1
Simi Valley, CA
55 Years of Data
Avg High
67°F
Avg Low
51°F
Warmest
2021
76°F avg
Coldest
2007
47°F avg
About This Date
December 1st in Simi Valley, CA typically brings mild winter weather, with average highs around 67°F and lows near 51°F. Over 31 years of records, the warmest December 1st was in 2021 (76°F average), while the coldest was 2007 (47°F) — a 29°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 4.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.9°F warmer on this date compared to 20-30 years ago.
Planning for December 1st in Simi Valley, CA? Great weather for outdoor activities.
Warming Trend
1.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 69° | 51° | 60° | — | — |
| 2024 | 75° | 59° | 67° | — | — |
| 2023 | 64° | 49° | 56° | — | — |
| 2022 | 53° | 45° | 49° | — | — |
| 2021warmest | 86° | 67° | 76° | — | — |
| 2020 | 78° | 63° | 70° | — | — |
| 2019 | 57° | 44° | 51° | — | — |
| 2018 | 60° | 47° | 53° | — | — |
| 2017 | 80° | 59° | 70° | — | — |
| 2016 | 61° | 48° | 54° | — | — |
| 2015 | 68° | 52° | 60° | — | — |
| 2014 | 63° | 55° | 59° | — | — |
| 2013 | 76° | 61° | 68° | — | — |
| 2012 | 55° | 48° | 52° | — | — |
| 2011 | 64° | 50° | 57° | — | — |
| 2010 | 74° | 52° | 63° | — | — |
| 2009 | 66° | 48° | 57° | — | — |
| 2008 | 81° | 54° | 67° | — | — |
| 2007coldest | 54° | 41° | 47° | — | — |
| 2006 | 77° | 50° | 64° | — | — |
| 2005 | 66° | 50° | 58° | — | — |
| 2004 | 61° | 46° | 53° | — | — |
| 2003 | 68° | 48° | 58° | — | — |
| 2002 | 64° | 45° | 54° | — | — |
| 2001 | 59° | 43° | 51° | — | — |
| 2000 | 68° | 58° | 63° | — | — |
| 1999 | 65° | 50° | 57° | — | — |
| 1998 | 52° | 49° | 50° | — | — |
| 1997 | 67° | 48° | 57° | — | — |
| 1996 | 66° | 47° | 56° | — | — |
| 1995 | 76° | 58° | 67° | — | — |
31 years of data from SIMI VALLEY CALIFORNIA