TODAY JUN17
TEMPERATURE65
HUMIDITY70
PRESSURE29.91
WIND COND.211 2
  • 7252Mon
  • 7752Tue
  • 7752Wed
  • 7853Thu
  • 8053Fri
daynightWeather update from DW7094 Mill Valley at

Alto 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
January38°F69°F50°Fn/a
February40°F71°F51°Fn/a
March42°F75°F54°Fn/a
April42°F82°F54°Fn/a
May47°F94°F58°Fn/a
June48°F95°F61°Fn/a
July51°F83°F61°Fn/a
August54°F84°F62°Fn/a
September53°F84°F63°Fn/a
October50°F82°F61°Fn/a
November43°F78°F56°Fn/a
December36°F64°F49°Fn/a

Did you know?

  • The highest monthly average temperature in Alto for September is 63 degrees.
  • The lowest monthly average temperature in Alto for December is 49 degrees.
  • The most monthly precipitation in Alto occurs in January with 0 inches.
  • The air quality index in Alto is 13% better than the national average.
  • The pollution index in Alto is 62% worse than the national average.

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Compare Alto, CA Weather To Other Cities

Alto 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.
IndexAltoCaliforniaNational
Air quality index435550
Pollution index8,232,36018,106,7265,066,862

Alto air quality information

MeasurementTotal
Days measured365
Days with good air quality241
Days with moderate air quality115
Days w/ poor A.Q. for sensitive groups9
Days with unhealthy air quality

Alto air quality information

PollutantTotal
Arsenic0.010%
Benzene0.060%
Carbon Tetrachloride0.000%
Lead0.010%
Mercury0.010%

Average monthly Alto temperature with heat index

Alto monthly precipitation with daily maximum

Alto monthly snow depth with daily maximum

Alto monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Kentfield, CA6,9074314%
Marin City, CA3,1154314%
Nicasio, CA1134314%
Pinole, CA19,0404314%
Ross, CA2,3814314%
Alto, CA6494314%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Lake Petersburg, IL6493530%
Belle Fontaine, AL6493138%
North Troy, VT6493628%
Wickliffe, KY6493628%
Fleming-Neon, KY6494510%
Alto, CA6494314%
Source: The Alto, 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.