Napa, CA Weather - Forecast & Monthly Averages

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TEMPERATURE	70
HUMIDITY
PRESSURE	101253.02
WIND COND.	210 11.1

Weather Quick Facts

The highest monthly average temperature in Napa for July is 64.6 degrees
The lowest monthly average temperature in Napa for December is 46.6 degrees
The most monthly precipitation in Napa occurs in January with 3.8 inches
The air quality index in Napa is 17% better than the national average
The pollution index in Napa is 161% worse than the national average

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Napa 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	36°F	58°F	47°F	3.8"
February	39°F	62°F	50°F	3.4"
March	41°F	66°F	52°F	3.0"
April	42°F	69°F	55°F	1.6"
May	46°F	74°F	59°F	0.5"
June	50°F	80°F	64°F	0.3"
July	53°F	81°F	65°F	0.0"
August	53°F	80°F	64°F	0.0"
September	49°F	82°F	64°F	0.1"
October	45°F	76°F	59°F	1.3"
November	40°F	66°F	52°F	1.8"
December	36°F	58°F	47°F	3.8"

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Napa 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	Napa	California	National
Air quality index	35	55	42
Pollution index	7,123,510	10,473,190	2,726,193

Napa air quality

Measurement	Total
Days measured	363
Days with good air quality	330
Days with moderate air quality	31
Days w/ poor A.Q. for sensitive groups	2
Days with unhealthy air quality	0

Air quality details

Pollutant	Total
Arsenic	0.110%
Benzene	0.070%
Carbon Tetrachloride	0.000%
Lead	0.090%
Mercury	0.050%

Average monthly Napa temperature with heat index

Napa monthly precipitation with daily maximum

Napa monthly snow depth with daily maximum

Napa monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Glen Ellen, CA	1,245	34	32.0%
St. Helena, CA	6,176	34	32.0%
Kenwood, CA	557	34	32.0%
El Verano, CA	3,358	35	30.0%
Oakville, CA	77	35	30.0%
Napa, CA	80,932	35	30.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Pharr, TX	80,998	42	16.0%
Boynton Beach, FL	80,667	41	18.0%
Parma, OH	80,602	50	= 100
Perris, CA	80,566	89	78.0%
New Rochelle, NY	81,413	51	2.0%
Napa, CA	80,932	35	30.0%

Source: The Napa, 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.