Grand Coulee Dam Airport Rainfall Forecast

  • 10%
  • 90%
  • 75%
  • 65%
  • 50%
  • 35%
  • 20%
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Grand Coulee Dam Airport Rainfall Statistics

December Rainfall

Omak Airport (42.3 miles)

  • Total Rainfall December

    0.1in

  • Daily Average December

    0.01in

  • Wettest Day 1 December, 2025

    0.04in

  • Wet Days December

    2/6 (33%)

Climate (2010–Present)

Omak Airport (42.3 miles)

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  • Annual Average 2020–2024

    11.4in

  • Monthly Average 2020–2025

    0.9in

  • Daily Average 2020–2025

    0.03in

  • Wettest Day 10 December, 2022

    0.9in
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