Castro Valley, CA Weather - Forecast & Monthly Averages

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TEMPERATURE	66
HUMIDITY	68
PRESSURE	101320
WIND COND.	9.4

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Weather Quick Facts

The highest monthly average temperature in Castro Valley for August is 64.4 degrees
The lowest monthly average temperature in Castro Valley for December is 49.2 degrees
The most monthly precipitation in Castro Valley occurs in January with 3.5 inches
The air quality index in Castro Valley is 5% better than the national average
The pollution index in Castro Valley is 136% worse than the national average

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Castro Valley Average Temperature

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
Month	Temp. _(min)	Temp. _(max)	Temp. _(avg)	Precipitation
January	42°F	58°F	50°F	3.5"
February	46°F	61°F	53°F	3.3"
March	46°F	64°F	54°F	2.6"
April	48°F	66°F	56°F	1.8"
May	52°F	69°F	59°F	0.6"
June	56°F	73°F	62°F	0.1"
July	57°F	75°F	64°F	0.0"
August	58°F	76°F	64°F	0.0"
September	57°F	76°F	64°F	0.2"
October	53°F	72°F	61°F	1.4"
November	48°F	66°F	56°F	1.3"
December	42°F	58°F	49°F	3.2"

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Castro 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.
Index	Castro Valley	California	National
Air quality index	40	55	42
Pollution index	6,427,290	10,473,190	2,726,193

Castro Valley air quality

Measurement	Total
Days measured	365
Days with good air quality	290
Days with moderate air quality	74
Days w/ poor A.Q. for sensitive groups	1
Days with unhealthy air quality	0

Air quality details

Pollutant	Total
Arsenic	0.010%
Benzene	0.110%
Carbon Tetrachloride	0.010%
Lead	0.010%
Mercury	0.003%

Average monthly Castro Valley temperature with heat index

Castro Valley monthly precipitation with daily maximum

Castro Valley monthly snow depth with daily maximum

Castro Valley monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Alamo, CA	13,864	40	20.0%
North Gate, CA	740	40	20.0%
Saranap, CA	6,027	40	20.0%
Camino Tassajara, CA	5,870	40	20.0%
Moraga, CA	16,896	40	20.0%
Castro Valley, CA	64,392	40	20.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Janesville, WI	64,415	38	24.0%
Noblesville, IN	64,430	42	16.0%
Port Charlotte, FL	64,335	36	28.0%
Eden Prairie, MN	64,481	46	8.0%
Tulare, CA	64,546	66	32.0%
Castro Valley, CA	64,392	40	20.0%

Source: The Castro 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.