Weather on December 3
Simi Valley, CA
55 Years of Data
Avg High
66°F
Avg Low
50°F
Warmest
2000
66°F avg
Coldest
1998
49°F avg
About This Date
December 3rd in Simi Valley, CA typically brings mild winter weather, with average highs around 66°F and lows near 50°F. Over 31 years of records, the warmest December 3rd was in 2000 (66°F average), while the coldest was 1998 (49°F) — a 17°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
Planning for December 3rd in Simi Valley, CA? Great weather for outdoor activities.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 63° | 48° | 55° | — | — |
| 2024 | 70° | 55° | 62° | — | — |
| 2023 | 70° | 53° | 61° | — | — |
| 2022 | 67° | 53° | 60° | — | — |
| 2021 | 67° | 44° | 55° | — | — |
| 2020 | 66° | 55° | 61° | — | — |
| 2019 | 64° | 55° | 60° | — | — |
| 2018 | 61° | 48° | 54° | — | — |
| 2017 | 72° | 51° | 61° | — | — |
| 2016 | 66° | 48° | 57° | — | — |
| 2015 | 75° | 50° | 63° | — | — |
| 2014 | 60° | 55° | 58° | — | — |
| 2013 | 65° | 45° | 55° | — | — |
| 2012 | 55° | 46° | 51° | — | — |
| 2011 | 59° | 46° | 53° | — | — |
| 2010 | 71° | 49° | 60° | — | — |
| 2009 | 70° | 45° | 57° | — | — |
| 2008 | 66° | 48° | 57° | — | — |
| 2007 | 73° | 52° | 62° | — | — |
| 2006 | 64° | 55° | 60° | — | — |
| 2005 | 61° | 46° | 53° | — | — |
| 2004 | 61° | 50° | 55° | — | — |
| 2003 | 73° | 55° | 64° | — | — |
| 2002 | 66° | 46° | 56° | — | — |
| 2001 | 55° | 46° | 51° | — | — |
| 2000warmest | 74° | 59° | 66° | — | — |
| 1999 | 61° | 49° | 55° | — | — |
| 1998coldest | 53° | 45° | 49° | — | — |
| 1997 | 64° | 49° | 56° | — | — |
| 1996 | 73° | 51° | 62° | — | — |
| 1995 | 69° | 50° | 60° | — | — |
31 years of data from SIMI VALLEY CALIFORNIA