TODAY DEC15
TEMPERATURE50
HUMIDITY100
PRESSURE30.06
WIND COND.340 3.4
  • 5945Sun100%100%
  • 6039Mon20%
  • 6240Tue
  • 6542Wed
  • 6340Thu
daynightWeather update from Santa Rosa, Santa Rosa Sonoma County Airport at

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St. Helena Average Temperature

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January36°F60°F46°F6.0"
February39°F64°F50°F5.7"
March41°F67°F52°F4.6"
April43°F71°F55°F2.4"
May46°F77°F60°F1.1"
June50°F83°F64°F0.4"
July52°F85°F65°F0.0"
August52°F84°F64°F0.0"
September49°F85°F64°F0.2"
October46°F78°F59°F2.0"
November41°F67°F52°F3.2"
December36°F59°F46°F6.9"

Did you know?

  • The highest monthly average temperature in St. Helena for July is 65 degrees.
  • The lowest monthly average temperature in St. Helena for December is 46 degrees.
  • The most monthly precipitation in St. Helena occurs in December with 6.9 inches.
  • The air quality index in St. Helena is 29% better than the national average.
  • The pollution index in St. Helena is 55% worse than the national average.

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Compare St. Helena, CA Weather To Other Cities

St. Helena air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
IndexSt. HelenaCaliforniaNational
Air quality index355550
Pollution index7,898,29018,106,7265,066,862

St. Helena air quality information

MeasurementTotal
Days measured365
Days with good air quality296
Days with moderate air quality69
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

St. Helena air quality information

PollutantTotal
Arsenic0.260%
Benzene0.080%
Carbon Tetrachloride0.005%
Lead0.240%
Mercury0.270%

Average monthly St. Helena temperature with heat index

St. Helena monthly precipitation with daily maximum

St. Helena monthly snow depth with daily maximum

St. Helena monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Cotati, CA7,4153530%
Roseland, CA5,8593530%
Angwin, CA3,5053530%
Deer Park, CA1,0923530%
Glen Ellen, CA7263530%
St. Helena, CA5,9953530%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Deschutes River Woods, OR5,9933236%
Brookville, OH5,993484%
Erwin, TN5,9984510%
Bowleys Quarters, MD5,998468%
Ranchettes, WY6,0004020%
St. Helena, CA5,9953530%
Source: The St. Helena, CA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.