TODAY DEC23
TEMPERATURE38
HUMIDITY100
PRESSURE101630
WIND COND.300 9.4
  • 4139Mon50%
  • 4331Tue60%
  • 383520%100%
  • 4135Thu70%50%
  • 4035Fri60%70%
daynightWeather update from Ephrata, Ephrata Municipal Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Coulee City for July is 77.6 degrees
  • The lowest monthly average temperature in Coulee City for December is 26.4 degrees
  • The most monthly precipitation in Coulee City occurs in December with 1.2 inches
  • The air quality index in Coulee City is 57% better than the national average
  • The pollution index in Coulee City is 2% better than the national average

Compare Coulee City, WA Weather

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      Coulee City 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
      January22°F36°F28°F0.8"
      February27°F45°F35°F0.5"
      March32°F55°F43°F0.6"
      April38°F64°F50°F0.5"
      May47°F75°F61°F0.8"
      June54°F81°F67°F0.9"
      July62°F92°F78°F0.1"
      August59°F89°F74°F0.1"
      September50°F80°F65°F0.2"
      October39°F63°F50°F0.6"
      November30°F46°F38°F1.0"
      December19°F34°F26°F1.2"

      Coulee City 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.
      IndexCoulee CityWashingtonNational
      Air quality index183642
      Pollution index2,683,4104,541,8502,726,193

      Coulee City air quality

      MeasurementTotal
      Days measured365
      Days with good air quality339
      Days with moderate air quality26
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.000%
      Benzene0.040%
      Carbon Tetrachloride0.004%
      Lead0.030%
      Mercury0.000%

      Average monthly Coulee City temperature with heat index

      Coulee City monthly precipitation with daily maximum

      Coulee City monthly snow depth with daily maximum

      Coulee City monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Wilson Creek, WA1931864.0%
      Banks Lake South, WA1131864.0%
      Hartline, WA1821864.0%
      Krupp, WA411864.0%
      Coulee City, WA5791864.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Jacumba, CA5795816.0%
      East Galesburg, IL5794118.0%
      Ullin, IL5794412.0%
      LeRoy, KS5792256.0%
      Laddonia, MO5793824.0%
      Coulee City, WA5791864.0%
      Source: The Coulee City, 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.