Weather on December 30
Simi Valley, CA
55 Years of Data
Avg High
63°F
Avg Low
49°F
Warmest
1998
72°F avg
Coldest
2010
46°F avg
About This Date
December 30th in Simi Valley, CA typically brings mild winter weather, with average highs around 63°F and lows near 49°F. Over 31 years of records, the warmest December 30th was in 1998 (72°F average), while the coldest was 2010 (46°F) — a 26°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 2.1°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.1°F cooler on this date compared to 20-30 years ago.
Planning for December 30th in Simi Valley, CA? Great weather for outdoor activities.
Cooling Trend
1.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 65° | 59° | 62° | — | — |
| 2024 | 68° | 47° | 57° | — | — |
| 2023 | 57° | 48° | 53° | — | — |
| 2022 | 53° | 49° | 51° | — | — |
| 2021 | 49° | 46° | 47° | — | — |
| 2020 | 67° | 51° | 59° | — | — |
| 2019 | 56° | 46° | 51° | — | — |
| 2018 | 64° | 47° | 55° | — | — |
| 2017 | 77° | 59° | 68° | — | — |
| 2016 | 62° | 50° | 56° | — | — |
| 2015 | 60° | 44° | 52° | — | — |
| 2014 | 51° | 43° | 47° | — | — |
| 2013 | 75° | 57° | 66° | — | — |
| 2012 | 53° | 40° | 46° | — | — |
| 2011 | 72° | 50° | 61° | — | — |
| 2010coldest | 51° | 41° | 46° | — | — |
| 2009 | 49° | 45° | 47° | — | — |
| 2008 | 72° | 55° | 63° | — | — |
| 2007 | 59° | 41° | 50° | — | — |
| 2006 | 64° | 43° | 53° | — | — |
| 2005 | 64° | 46° | 55° | — | — |
| 2004 | 54° | 43° | 48° | — | — |
| 2003 | 54° | 48° | 51° | — | — |
| 2002 | 61° | 41° | 51° | — | — |
| 2001 | 59° | 50° | 55° | — | — |
| 2000 | 75° | 60° | 68° | — | — |
| 1999 | 68° | 44° | 56° | — | — |
| 1998warmest | 83° | 62° | 72° | — | — |
| 1997 | 78° | 60° | 69° | — | — |
| 1996 | 59° | 51° | 55° | — | — |
| 1995 | 72° | 52° | 62° | — | — |
31 years of data from SIMI VALLEY CALIFORNIA