The year at a glance
Averages from 30 years of climate history, 1991-2020
| Napa | Metric | Sonoma |
|---|---|---|
| 258 days | Sunny daysclear or partly cloudy skies | 257 days |
| 23 in | Precipitationper year | 25 in |
| 55 days | Wet daysrain or snow per year | 56 days |
| 0 in | Snowfallper year | 0 in |
| 31 days | Hot daysabove 90 °F | 44 days |
| 15 days | Freezing nightsat or below 32 °F | 21 days |
| 67% | Humidityaverage relative | 69% |
| 60 °F | Average temperatureyear round | 59 °F |
Monthly temperatures
Average daily high and low for each month, in °F. The gap between the two lines is what an ordinary day feels like across the year.
Daily highs
Daily lows
View monthly temperatures as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Napa high | 58 | 63 | 67 | 71 | 76 | 82 | 83 | 83 | 84 | 78 | 66 | 58 |
| Sonoma high | 57 | 62 | 65 | 69 | 75 | 83 | 86 | 86 | 85 | 78 | 65 | 57 |
| Napa low | 40 | 42 | 43 | 45 | 49 | 53 | 55 | 55 | 53 | 49 | 43 | 39 |
| Sonoma low | 38 | 40 | 42 | 44 | 48 | 51 | 53 | 53 | 51 | 47 | 42 | 38 |
Monthly precipitation
Total rain plus melted snow for each month, in inches. Taller bars mean wetter months.
View monthly precipitation as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Napa | 4.6 | 4.6 | 3.4 | 1.5 | 0.8 | 0.2 | 0.0 | 0.0 | 0.1 | 1.0 | 2.2 | 4.3 |
| Sonoma | 5.0 | 5.1 | 3.7 | 1.6 | 0.8 | 0.2 | 0.0 | 0.0 | 0.1 | 1.1 | 2.5 | 4.8 |
Monthly sunny days
Days each month with clear or partly cloudy skies, so compare the same month between cities.
View monthly sunny days as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Napa | 14 | 13 | 16 | 20 | 24 | 27 | 30 | 30 | 28 | 25 | 18 | 15 |
| Sonoma | 14 | 13 | 16 | 19 | 23 | 27 | 30 | 29 | 28 | 25 | 18 | 15 |
Keep comparing
Nearby cities and popular picks for each side of this matchup. Any two cities can be compared from the home page.
Napa vs another city
- Napa vs American Canyon, CA
- Napa vs Boyes Hot Springs, CA
- Napa vs Vallejo, CA
- Napa vs Fairfield, CA
- Napa vs Suisun City, CA
- Napa vs New York, NY
- Napa vs Los Angeles, CA
- Napa vs Chicago, IL
- Napa vs Houston, TX
- Napa vs Phoenix, AZ
- Napa vs Philadelphia, PA
Sonoma vs another city
- Sonoma vs Boyes Hot Springs, CA
- Sonoma vs Petaluma, CA
- Sonoma vs American Canyon, CA
- Sonoma vs Rohnert Park, CA
- Sonoma vs Cotati, CA
- Sonoma vs New York, NY
- Sonoma vs Los Angeles, CA
- Sonoma vs Chicago, IL
- Sonoma vs Houston, TX
- Sonoma vs Phoenix, AZ
- Sonoma vs Philadelphia, PA
About this data
Every figure on this page is a 30 year average computed from daily climate history for 1991-2020, using each city's own coordinates. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.
Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).