Weather on December 19
Simi Valley, CA
55 Years of Data
Avg High
65°F
Avg Low
49°F
Warmest
2024
71°F avg
Coldest
2008
45°F avg
About This Date
December 19th in Simi Valley, CA typically brings mild winter weather, with average highs around 65°F and lows near 49°F. Over 31 years of records, the warmest December 19th was in 2024 (71°F average), while the coldest was 2008 (45°F) — a 26°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
Planning for December 19th in Simi Valley, CA? Great weather for outdoor activities.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 76° | 55° | 65° | — | — |
| 2024warmest | 78° | 64° | 71° | — | — |
| 2023 | 60° | 51° | 56° | — | — |
| 2022 | 61° | 47° | 54° | — | — |
| 2021 | 66° | 51° | 59° | — | — |
| 2020 | 73° | 54° | 63° | — | — |
| 2019 | 63° | 47° | 55° | — | — |
| 2018 | 75° | 54° | 64° | — | — |
| 2017 | 70° | 51° | 60° | — | — |
| 2016 | 60° | 49° | 54° | — | — |
| 2015 | 63° | 45° | 54° | — | — |
| 2014 | 58° | 49° | 53° | — | — |
| 2013 | 51° | 44° | 48° | — | — |
| 2012 | 53° | 38° | 45° | — | — |
| 2011 | 55° | 43° | 49° | — | — |
| 2010 | 59° | 55° | 57° | — | — |
| 2009 | 73° | 59° | 66° | — | — |
| 2008coldest | 55° | 36° | 45° | — | — |
| 2007 | 57° | 52° | 54° | — | — |
| 2006 | 57° | 39° | 48° | — | — |
| 2005 | 72° | 45° | 58° | — | — |
| 2004 | 75° | 57° | 66° | — | — |
| 2003 | 75° | 54° | 64° | — | — |
| 2002 | 55° | 39° | 47° | — | — |
| 2001 | 68° | 45° | 56° | — | — |
| 2000 | 75° | 55° | 65° | — | — |
| 1999 | 77° | 60° | 69° | — | — |
| 1998 | 52° | 44° | 48° | — | — |
| 1997 | 58° | 51° | 54° | — | — |
| 1996 | 70° | 49° | 59° | — | — |
| 1995 | 62° | 48° | 55° | — | — |
31 years of data from SIMI VALLEY CALIFORNIA