Average monthly hours of sunshine in St. Helena (CA)
The monthly total of sunhours over the year in St. Helena (California), the United States of America.
- On average, May is the sunniest month with 310 hours of sunshine.
- December has on average the lowest amount of sunshine with 160 hours.
Weather Forecasts for St. Helena (CA)
clear and no rain
broken clouds and rain
partly cloudy and no rain