TODAY AUG15
TEMPERATURE82
HUMIDITY
PRESSURE30.04
WIND COND.
  • 9062Wed
  • 9061Thu
  • 9262Fri
  • 9363Sat
  • 9362Sun
daynightWeather update from Nevada County Air Park at

Grass Valley Average Weather

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
January35°F49°F41°F7.8"
February35°F47°F40°F8.4"
March36°F49°F41°F10.1"
April38°F54°F45°F5.7"
May46°F62°F53°F3.7"
June55°F71°F62°F1.4"
July64°F79°F71°F0.1"
August63°F79°F70°F0.1"
September58°F74°F65°F1.4"
October48°F63°F54°F4.8"
November40°F53°F46°F7.3"
December34°F46°F39°F11.7"

Did you know?

  • The highest monthly average temperature in Grass Valley for July is 71 degrees.
  • The lowest monthly average temperature in Grass Valley for December is 39 degrees.
  • The most monthly precipitation in Grass Valley occurs in December with 11.7 inches.
  • The air quality index in Grass Valley is 15% better than the national average.
  • The pollution index in Grass Valley is 15% better than the national average.

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Compare Grass Valley, CA Weather To Other Cities

Grass Valley 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.
IndexGrass ValleyCaliforniaNational
Air quality index425550
Pollution index4,289,31018,106,7265,066,862

Grass Valley air quality information

MeasurementTotal
Days measured365
Days with good air quality262
Days with moderate air quality103
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Grass Valley air quality information

PollutantTotal
Arsenic0.050%
Benzene0.070%
Carbon Tetrachloride0.001%
Lead0.060%
Mercury0.010%

Average monthly Grass Valley temperature with heat index

Grass Valley monthly precipitation with daily maximum

Grass Valley monthly snow depth with daily maximum

Grass Valley monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Alta Sierra, CA6,6394216%
Lake of the Pines, CA3,9364216%
Penn Valley, CA1,6074216%
Colfax, CA2,1894216%
Lake Wildwood, CA5,2894216%
Grass Valley, CA12,8614216%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Grenada, MS12,8633334%
Gaffney, SC12,8593628%
Luling, LA12,8554510%
Herrin, IL12,8683922%
Malibu, CA12,8537448%
Grass Valley, CA12,8614216%
Source: The Grass Valley, 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.