Portola Valley, CA Weather - Forecast & Monthly Averages

TEMPERATURE	57
HUMIDITY	74
PRESSURE
WIND COND.	1 9.6

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Weather Quick Facts

The highest monthly average temperature in Portola Valley for July is 66.7 degrees
The lowest monthly average temperature in Portola Valley for January is 50.4 degrees
The most monthly precipitation in Portola Valley occurs in December with 2.6 inches
The air quality index in Portola Valley is 2% worse than the national average
The pollution index in Portola Valley is 321% worse than the national average

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Portola 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	61°F	50°F	2.4"
February	45°F	63°F	53°F	2.4"
March	47°F	67°F	56°F	2.0"
April	49°F	70°F	58°F	1.3"
May	53°F	73°F	61°F	0.3"
June	56°F	77°F	65°F	0.2"
July	59°F	78°F	67°F	0.0"
August	59°F	78°F	66°F	0.0"
September	57°F	80°F	67°F	0.1"
October	53°F	75°F	63°F	0.7"
November	47°F	67°F	56°F	1.3"
December	42°F	60°F	51°F	2.6"

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Portola 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	Portola Valley	California	National
Air quality index	43	55	42
Pollution index	11,477,200	10,473,190	2,726,193

Portola Valley air quality

Measurement	Total
Days measured	365
Days with good air quality	263
Days with moderate air quality	98
Days w/ poor A.Q. for sensitive groups	4
Days with unhealthy air quality	0

Air quality details

Pollutant	Total
Arsenic	0.070%
Benzene	0.110%
Carbon Tetrachloride	0.000%
Lead	0.160%
Mercury	0.090%

Average monthly Portola Valley temperature with heat index

Portola Valley monthly precipitation with daily maximum

Portola Valley monthly snow depth with daily maximum

Portola Valley monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Pescadero, CA	418	35	30.0%
Lexington Hills, CA	2,656	35	30.0%
Loma Mar, CA	282	35	30.0%
West Menlo Park, CA	3,720	43	14.0%
Saratoga, CA	31,084	43	14.0%
Portola Valley, CA	4,568	43	14.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Humboldt, IA	4,568	37	26.0%
Longbranch, WA	4,568	30	40.0%
Rio Communities, NM	4,566	53	6.0%
Williamstown, MA	4,565	35	30.0%
Hollister, MO	4,564	18	64.0%
Portola Valley, CA	4,568	43	14.0%

Source: The Portola 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.