St. Helena has around 42 fewer freezing nights a year.
The year at a glance
Averages from 30 years of climate history, 1991-2020
| Hidden Valley Lake | Metric | St. Helena |
|---|---|---|
| 262 days | Sunny daysclear or partly cloudy skies | 259 days |
| 27 in | Precipitationper year | 27 in |
| 59 days | Wet daysrain or snow per year | 58 days |
| 1 in | Snowfallper year | 0 in |
| 60 days | Hot daysabove 90 °F | 54 days |
| 56 days | Freezing nightsat or below 32 °F | 14 days |
| 62% | Humidityaverage relative | 66% |
| 58 °F | Average temperatureyear round | 61 °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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hidden Valley Lake high | 55 | 58 | 62 | 67 | 73 | 83 | 90 | 89 | 85 | 76 | 63 | 55 |
| St. Helena high | 59 | 62 | 67 | 72 | 78 | 85 | 89 | 89 | 87 | 78 | 66 | 58 |
| Hidden Valley Lake low | 35 | 36 | 38 | 41 | 46 | 52 | 55 | 54 | 51 | 45 | 38 | 35 |
| St. Helena low | 40 | 42 | 44 | 46 | 51 | 54 | 56 | 56 | 54 | 49 | 44 | 40 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hidden Valley Lake | 5.3 | 5.3 | 3.9 | 1.7 | 1.0 | 0.3 | 0.0 | 0.0 | 0.1 | 1.2 | 2.6 | 5.3 |
| St. Helena | 5.4 | 5.4 | 4.0 | 1.7 | 1.0 | 0.3 | 0.0 | 0.0 | 0.1 | 1.3 | 2.7 | 5.5 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hidden Valley Lake | 14 | 14 | 16 | 19 | 24 | 27 | 30 | 30 | 29 | 26 | 18 | 15 |
| St. Helena | 14 | 13 | 16 | 19 | 24 | 27 | 30 | 30 | 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.
Hidden Valley Lake vs another city
- Hidden Valley Lake vs Clearlake, CA
- Hidden Valley Lake vs Calistoga, CA
- Hidden Valley Lake vs Healdsburg, CA
- Hidden Valley Lake vs Windsor, CA
- Hidden Valley Lake vs Larkfield-Wikiup, CA
- Hidden Valley Lake vs New York, NY
- Hidden Valley Lake vs Los Angeles, CA
- Hidden Valley Lake vs Chicago, IL
- Hidden Valley Lake vs Houston, TX
- Hidden Valley Lake vs Phoenix, AZ
- Hidden Valley Lake vs Philadelphia, PA
St. Helena vs another city
- St. Helena vs Calistoga, CA
- St. Helena vs Santa Rosa, CA
- St. Helena vs Boyes Hot Springs, CA
- St. Helena vs Sonoma, CA
- St. Helena vs Larkfield-Wikiup, CA
- St. Helena vs Rohnert Park, CA
- St. Helena vs New York, NY
- St. Helena vs Los Angeles, CA
- St. Helena vs Chicago, IL
- St. Helena vs Houston, TX
- St. Helena vs Phoenix, AZ
- St. Helena 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).