TODAY MAR29
TEMPERATURE50
HUMIDITY71
PRESSURE101020
WIND COND.160 18.4
  • 5938Fri20%
  • 6339Sat
  • 6340Sun
  • 6543Mon
  • 6844Tue
daynightWeather update from Pearson Airfield at
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Weather Quick Facts

  • The highest monthly average temperature in Walnut Grove for August is 69.4 degrees
  • The lowest monthly average temperature in Walnut Grove for December is 40.1 degrees
  • The most monthly precipitation in Walnut Grove occurs in November with 6.2 inches
  • The air quality index in Walnut Grove is 10% better than the national average
  • The pollution index in Walnut Grove is 30% better than the national average

Compare Walnut Grove, WA Weather

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      Walnut Grove Average Temperature

      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
      January34°F48°F40°F5.4"
      February36°F52°F43°F3.7"
      March39°F57°F47°F4.9"
      April42°F63°F52°F2.9"
      May48°F71°F58°F2.6"
      June53°F76°F63°F1.7"
      July57°F84°F69°F0.5"
      August57°F84°F69°F0.4"
      September52°F79°F64°F1.5"
      October46°F66°F55°F3.7"
      November40°F54°F47°F6.2"
      December34°F47°F40°F6.2"

      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 index383642
      Pollution index1,899,4104,541,8502,726,193

      Walnut Grove air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality285
      Days with moderate air quality77
      Days w/ poor A.Q. for sensitive groups3
      Days with unhealthy air quality0

      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

      CityPopulationAir Quality IndexNational Avg.
      St. Helens, OR13,7791864.0%
      Maywood Park, OR1,2243824.0%
      Brush Prairie, WA2,7213824.0%
      Lewisville, WA2,1663824.0%
      Washougal, WA15,9273824.0%
      Walnut Grove, WA9,3243824.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Northwest Harborcreek, PA9,3213628.0%
      Hondo, TX9,321492.0%
      Sellersburg, IN9,320492.0%
      Brentwood, PA9,3195612.0%
      Bohemia, NY9,3294314.0%
      Walnut Grove, WA9,3243824.0%
      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.