Grass Valley, OR Weather - Forecast & Monthly Averages

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Weather Quick Facts

The highest monthly average temperature in Grass Valley for July is 75.3 degrees
The lowest monthly average temperature in Grass Valley for December is 34.9 degrees
The most monthly precipitation in Grass Valley occurs in December with 3.1 inches
The air quality index in Grass Valley is 45% better than the national average
The pollution index in Grass Valley is 54% better than the national average

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Grass 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	30°F	43°F	36°F	2.2"
February	32°F	51°F	40°F	1.4"
March	36°F	59°F	46°F	1.5"
April	41°F	66°F	52°F	0.8"
May	48°F	76°F	61°F	1.0"
June	55°F	82°F	67°F	0.5"
July	60°F	92°F	75°F	0.1"
August	59°F	91°F	75°F	0.2"
September	52°F	83°F	66°F	0.4"
October	43°F	67°F	54°F	1.3"
November	35°F	53°F	43°F	2.1"
December	29°F	42°F	35°F	3.1"

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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.
Index	Grass Valley	Oregon	National
Air quality index	23	32	42
Pollution index	1,258,680	7,156,356	2,726,193

Grass Valley air quality

Measurement	Total
Days measured	350
Days with good air quality	298
Days with moderate air quality	52
Days w/ poor A.Q. for sensitive groups	0
Days with unhealthy air quality	0

Air quality details

Pollutant	Total
Arsenic	0.000%
Benzene	0.020%
Carbon Tetrachloride	0.001%
Lead	0.010%
Mercury	0.000%

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	Population	Air Quality Index	National Avg.
Moro, OR	326	23	54.0%
Maupin, OR	387	23	54.0%
Grass Valley, OR	243	23	54.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Koyuk, AK	243	38	24.0%
Malcolm, AL	243	42	16.0%
East Globe, AZ	243	60	20.0%
McNeal, AZ	243	45	10.0%
Bloomfield, CA	243	34	32.0%
Grass Valley, OR	243	23	54.0%

Source: The Grass Valley, OR 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.