Weather on December 4
Simi Valley, CA
55 Years of Data
Avg High
66°F
Avg Low
50°F
Warmest
2007
72°F avg
Coldest
1998
47°F avg
About This Date
December 4th 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 4th was in 2007 (72°F average), while the coldest was 1998 (47°F) — a 25°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 2.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.9°F warmer on this date compared to 20-30 years ago.
Planning for December 4th in Simi Valley, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 66° | 55° | 61° | — | — |
| 2024 | 71° | 50° | 61° | — | — |
| 2023 | 78° | 59° | 69° | — | — |
| 2022 | 56° | 51° | 53° | — | — |
| 2021 | 66° | 45° | 55° | — | — |
| 2020 | 73° | 54° | 63° | — | — |
| 2019 | 55° | 49° | 52° | — | — |
| 2018 | 62° | 50° | 56° | — | — |
| 2017 | 61° | 51° | 56° | — | — |
| 2016 | 73° | 57° | 65° | — | — |
| 2015 | 64° | 53° | 59° | — | — |
| 2014 | 65° | 54° | 59° | — | — |
| 2013 | 61° | 40° | 50° | — | — |
| 2012 | 54° | 43° | 48° | — | — |
| 2011 | 63° | 41° | 52° | — | — |
| 2010 | 64° | 49° | 56° | — | — |
| 2009 | 70° | 46° | 58° | — | — |
| 2008 | 66° | 48° | 57° | — | — |
| 2007warmest | 84° | 59° | 72° | — | — |
| 2006 | 72° | 57° | 64° | — | — |
| 2005 | 59° | 50° | 55° | — | — |
| 2004 | 61° | 39° | 50° | — | — |
| 2003 | 77° | 52° | 64° | — | — |
| 2002 | 68° | 45° | 56° | — | — |
| 2001 | 57° | 43° | 50° | — | — |
| 2000 | 70° | 58° | 64° | — | — |
| 1999 | 65° | 52° | 58° | — | — |
| 1998coldest | 54° | 40° | 47° | — | — |
| 1997 | 63° | 49° | 56° | — | — |
| 1996 | 73° | 52° | 62° | — | — |
| 1995 | 80° | 57° | 69° | — | — |
31 years of data from SIMI VALLEY CALIFORNIA