Best year time to visit City of Grand Coulee

General weather information about City of Grand Coulee

Average annual temperature is 11.1 °C

Absolute maximum temperature: 39.5 °C

Absolute minimum temperature: -14.2 °C

Number of sunny days: 228 days

Number of rainy days: 113 days

Number of snow days: 24 days

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* Weather data for City of Grand Coulee United States is based on climate observations for 2026 year

City of Grand Coulee air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)7.310.113.627.932.133.235.939.530.925.711.18.7
Average daytime temperature (°C)2.04.58.013.225.227.232.031.524.016.66.54.1
Average temperature (°C)-1.2-0.62.47.918.921.225.624.917.911.12.91.4
Average night temperature (°C)-3.8-4.0-2.43.213.015.518.818.512.76.40.3-0.6
Absolute minimum temperature (°C)-14.2-13.3-10.1-2.07.79.013.613.25.0-3.6-3.9-4.3

City of Grand Coulee monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.010.012.014.015.016.015.014.013.011.09.08.0
Daylight mean duration (h)8.910.211.913.715.216.015.614.312.610.89.38.5
Daylight minimum duration (h)8.09.011.012.014.015.015.013.011.010.08.08.0
Sunshine mean duration (h)3.86.38.59.312.613.313.811.610.18.05.13.0
Precipitation (mm)39212459221732516223962
Sunny days142017111522282523211913
Rainy days12371816836791113
Snow days557100000105

City of Grand Coulee - weather forecast by months

City of Grand Coulee weather in januaryCity of Grand Coulee weather in februaryCity of Grand Coulee weather in marchCity of Grand Coulee weather in aprilCity of Grand Coulee weather in mayCity of Grand Coulee weather in juneCity of Grand Coulee weather in julyCity of Grand Coulee weather in augustCity of Grand Coulee weather in septemberCity of Grand Coulee weather in octoberCity of Grand Coulee weather in novemberCity of Grand Coulee weather in december

Best time to visit City of Grand Coulee:

The best time to visit City of Grand Coulee during the most sunny months:

  • May — 12.6(h)
  • June — 13.3(h)
  • July — 13.8(h)
  • August — 11.6(h)

Months with the longest average daylight duration in City of Grand Coulee:

  • June — 16.0(h)
  • July — 15.6(h)

The largest precipitation sum in City of Grand Coulee is at

  • January — 39(mm)
  • April — 59(mm)
  • November — 39(mm)
  • December — 62(mm)

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    Frequently asked questions

    When is the best time to visit City of Grand Coulee?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit City of Grand Coulee.
    What is the weather like in City of Grand Coulee?
    See average temperature, rainfall and daylight hours for City of Grand Coulee by month in the table above.
    How many sunny days does City of Grand Coulee have?
    The monthly weather statistics above show sunshine and rainfall patterns for City of Grand Coulee throughout the year.