TODAY MAY25
TEMPERATURE68
HUMIDITY55
PRESSURE30
WIND COND.200 6.9
  • 6648Sat20%
  • 7451Sun
  • 7550
  • 6749Tue
  • 6548Wed
daynightWeather update from Pearson Airfield at

Walnut Grove 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
January16°F66°F41°F5.4"
February15°F65°F42°F2.2"
March25°F76°F47°F3.5"
April26°F84°F51°F2.7"
May33°F97°F59°F2.5"
June44°F101°F63°F1.4"
July48°F108°F70°F0.3"
August46°F102°F68°F0.8"
September37°F95°F63°F0.7"
October24°F78°F54°F2.8"
November25°F66°F47°F6.6"
December10°F63°F39°F6.1"

Did you know?

  • The highest monthly average temperature in Walnut Grove for July is 70 degrees.
  • The lowest monthly average temperature in Walnut Grove for December is 39 degrees.
  • The most monthly precipitation in Walnut Grove occurs in November with 6.6 inches.
  • The air quality index in Walnut Grove is 23% better than the national average.
  • The pollution index in Walnut Grove is 62% better than the national average.

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Compare Walnut Grove, WA Weather To Other Cities

Walnut Grove 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.
IndexWalnut GroveWashingtonNational
Air quality index383650
Pollution index1,899,4108,596,9895,066,862

Walnut Grove air quality information

MeasurementTotal
Days measured365
Days with good air quality241
Days with moderate air quality108
Days w/ poor A.Q. for sensitive groups12
Days with unhealthy air quality4

Walnut Grove air quality information

PollutantTotal
Arsenic0.003%
Benzene0.020%
Carbon Tetrachloride0.010%
Lead0.010%
Mercury0.002%

Average monthly Walnut Grove temperature with heat index

Walnut Grove monthly precipitation with daily maximum

Walnut Grove monthly snow depth with daily maximum

Walnut Grove monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
St. Helens, OR13,1692256%
Bethany, OR22,8193824%
Garden Home-Whitford, OR6,2913824%
Portland, OR620,5893824%
Scappoose, OR6,9013824%
Walnut Grove, WA9,3243824%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Columbia City, IN9,324476%
Harahan, LA9,3214510%
Springfield, FL9,3183726%
Louisville, OH9,3183922%
Fort Irwin, CA9,3371864%
Walnut Grove, WA9,3243824%
Source: The Walnut Grove, WA 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.