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Santa Rosa, CA Weather on April 20
April 20th in Santa Rosa, CA typically brings mild spring weather, with average highs around 69°F and lows near 46°F. Over 55 years of records, the warmest April 20th was in 2009 (73°F average), while the coldest was 2001 (44°F) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 24% of April 20th dates historically, with the wettest April 20th recording 1.24" of rain. The last decade has been 3.0°F warmer on this date compared to 20-30 years ago.
What to Expect on April 20
Planning for April 20th in Santa Rosa, CA? Great weather for outdoor activities.
April 20 Weather Records for Santa Rosa
- •The all-time record high for April 20th in Santa Rosa, CA is 93°F, set in 2009.
- •The coldest April 20th on record dropped to 34°F in 2008.
- •Temperatures have reached 90°F or higher on April 20th in 1 of the last 55 years.
- •Last year (1971), April 20th was 9°F cooler than the long-term average.
Frequently Asked Questions
What was the warmest April 20 ever in Santa Rosa?
The warmest April 20 in Santa Rosa, CA reached 93°F in 2009. That is 24°F above the long-term average high of 69°F.
What was the coldest April 20 ever in Santa Rosa?
The coldest April 20 in Santa Rosa, CA dropped to 34°F in 2008. That is 12°F below the long-term average low of 46°F.
What is the average temperature on April 20 in Santa Rosa?
On April 20, Santa Rosa averages a high of 69°F and a low of 46°F based on 55 years of NOAA weather observations from SANTA ROSA.
How many years of weather data are available for April 20 in Santa Rosa?
We have 55 years of weather records for April 20 in Santa Rosa, CA, sourced from NOAA's Global Historical Climatology Network. Records include daily high and low temperatures, precipitation, and snowfall data going back to 2025.
April 20 Weather History in Santa Rosa
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 69°F | 47°F | -- | -- |
| 2024 | 75°F | 49°F | 0" | -- |
| 2023 | 69°F | 44°F | -- | -- |
| 2022 | 64°F | 47°F | 0" | -- |
| 2021 | 75°F | 43°F | 0" | -- |
| 2020 | 68°F | 44°F | 0" | -- |
| 2019 | 73°F | 52°F | 0" | -- |
| 2018 | 77°F | 43°F | 0" | -- |
| 2017 | 69°F | 49°F | -- | -- |
| 2016 | 73°F | 47°F | -- | -- |
| 2015 | 65°F | 50°F | -- | -- |
| 2014 | 79°F | 52°F | -- | -- |
| 2013 | 78°F | 53°F | -- | -- |
| 2012 | 86°F | 54°F | -- | -- |
| 2011 | 61°F | 44°F | 0.2" | -- |
| 2010 | 59°F | 47°F | 1.24" | -- |
| 2009 | 93°F | 54°F | 0" | -- |
| 2008 | 58°F | 34°F | 0" | -- |
| 2007 | 65°F | 44°F | 1.14" | -- |
| 2006 | 71°F | 43°F | 0" | -- |
| 2005 | 64°F | 40°F | 0" | -- |
| 2004 | 63°F | 51°F | 0.91" | -- |
| 2003 | 67°F | 44°F | 0" | -- |
| 2002 | 73°F | 44°F | 0" | -- |
| 2001 | 49°F | 40°F | -- | -- |
| 2000 | 70°F | 47°F | -- | -- |
| 1999 | 72°F | 53°F | 0" | -- |
| 1998 | 73°F | 47°F | 0" | -- |
| 1997 | 69°F | 56°F | 0.1" | -- |
| 1996 | 59°F | 39°F | 0" | -- |
| 1995 | 62°F | 46°F | 0.28" | -- |
| 1994 | 69°F | 44°F | 0" | -- |
| 1993 | 70°F | 44°F | 0" | -- |
| 1992 | 78°F | 53°F | 0" | -- |
| 1991 | 62°F | 49°F | 0.41" | -- |
| 1990 | 65°F | 53°F | 0" | -- |
| 1989 | 72°F | 51°F | 0" | -- |
| 1988 | 58°F | 49°F | 0.38" | -- |
| 1987 | 76°F | 42°F | 0" | -- |
| 1986 | 79°F | 46°F | 0" | -- |
| 1985 | 57°F | 44°F | -- | -- |
| 1984 | 69°F | 40°F | 0" | -- |
| 1983 | 65°F | 51°F | 0.56" | -- |
| 1982 | 84°F | 47°F | 0" | -- |
| 1981 | 56°F | 43°F | 0.1" | -- |
| 1980 | 60°F | 48°F | 0.08" | -- |
| 1979 | 68°F | 34°F | 0" | -- |
| 1978 | 65°F | 45°F | 0.64" | -- |
| 1977 | 80°F | 38°F | 0" | -- |
| 1976 | 81°F | 43°F | 0" | -- |
| 1975 | 76°F | 40°F | 0" | -- |
| 1974 | 77°F | 40°F | 0" | -- |
| 1973 | 72°F | 43°F | 0" | -- |
| 1972 | 70°F | 35°F | 0" | -- |
| 1971 | 60°F | 44°F | 0.1" | -- |
Based on 55 years of data from NOAA station: SANTA ROSA
Monthly Climate Averages
Historical temperature and precipitation averages for Santa Rosa, CA, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.