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Weather in Umatilla County, Oregon for December 2025

Your guide to Umatilla County weather in December - trends and predictions

    Temperatures

  • In general, the average temperature in Umatilla County at the beginning of December is 1.4 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 7.6 °F by the end of December.

  • Rain 🌧️

  • Umatilla County in December brings notable rainfall, with an average of 16 rainy days and a total precipitation of 144.8 mm.

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Average dry days
15
Dry days
Average rainy days
16
Rainy days
Average snowy days
0
Snow days
Average temperatures
6°/1°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
84 %
Avg humidity

Umatilla County Weather December

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Temperatures trend during December in Umatilla County

See the weather trend as well as the moving average line

December weather in Umatilla County day by day

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Date Weather Temperatures Rain UV More
Dec. 1 Cloudy
Cloudy
1° /-1° 0 mm 1
Dec. 2 Cloudy
Cloudy
0° /-1° 0 mm 1
Dec. 3 Overcast
Overcast
0° /-1° 0 mm 1
Dec. 4 Overcast
Overcast
0° /0° 0 mm 1
Dec. 5 Overcast
Overcast
2° /-1° 0 mm 1
Dec. 6 Overcast
Overcast
1° /-1° 0 mm 1
Dec. 7 Moderate or heavy rain shower
Moderate or heavy rain shower
6° /-1° 18.2 mm 2
Dec. 8 Patchy rain possible
Patchy rain possible
7° /2° 0.9 mm 2
Dec. 9 Partly cloudy
Partly cloudy
5° /-1° 0 mm 3
Dec. 10 Overcast
Overcast
0° /-2° 0 mm 1
Dec. 11 Cloudy
Cloudy
5° /-2° 0 mm 2
Dec. 12 Light freezing rain
Light freezing rain
0° /-2° 3.1 mm 1
Dec. 13 Moderate rain at times
Moderate rain at times
6° /0° 4.6 mm 2
Dec. 14 Moderate or heavy rain shower
Moderate or heavy rain shower
9° /4° 10.1 mm 2
Dec. 15 Patchy rain possible
Patchy rain possible
7° /0° 0.1 mm 2
Dec. 16 Moderate or heavy rain shower
Moderate or heavy rain shower
3° /1° 10.3 mm 1
Dec. 17 Moderate or heavy rain shower
Moderate or heavy rain shower
8° /2° 10.7 mm 2
Dec. 18 Overcast
Overcast
12° /3° 0.1 mm 3
Dec. 19 Cloudy
Cloudy
7° /0° 0 mm 2
Dec. 20 Overcast
Overcast
6° /2° 0 mm 2
Dec. 21 Heavy rain at times
Heavy rain at times
5° /2° 8.2 mm 2
Dec. 22 Heavy rain at times
Heavy rain at times
9° /2° 6.6 mm 2
Dec. 23 Overcast
Overcast
11° /5° 1 mm 3
Dec. 24 Moderate or heavy rain shower
Moderate or heavy rain shower
9° /3° 19 mm 2
Dec. 25 Heavy rain at times
Heavy rain at times
7° /0° 9.3 mm 2
Dec. 26 Moderate or heavy rain shower
Moderate or heavy rain shower
10° /5° 15.9 mm 3
Dec. 27 Moderate or heavy rain shower
Moderate or heavy rain shower
8° /3° 14.6 mm 2
Dec. 28 Overcast
Overcast
9° /5° 5.1 mm 2
Dec. 29 Patchy rain possible
Patchy rain possible
8° /4° 6.8 mm 2
Dec. 30 Patchy rain possible
Patchy rain possible
6° /1° 0.1 mm 2
Dec. 31 Partly cloudy
Partly cloudy
5° /-1° 0 mm 2
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Important Notice
Our weather forecast for Umatilla County in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Umatilla County forecast closer to your planned date for the most up-to-date weather information.

Umatilla County in December - FAQ

What are the expected maximum and minimum temperatures in Umatilla County during December?
Prepare for cooler days with highs just around 6° and colder nights, dipping below 1°.
How much rainfall should be expected in Umatilla County during December?
Significant rainfall exceeding 144.8 mm is expected in Umatilla County during December, occurring over more than 16 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Umatilla County in December 2025?
Umatilla County typically sees 0 cm of snowfall during December.
What are the typical wind conditions in Umatilla County during December?
The average wind speed in Umatilla County during December is 16 km/h, suggesting breezy to windy conditions, depending on your activities.

December rainfall patterns in Umatilla County

Explore the daily rainfall trends and prepare for Umatilla Countys December weather 💧
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Location coordinates Where is Umatilla County?

Get accurate weather forecasts for Umatilla County, located at latitude 45.672 and longitude -118.789. Stay updated with localized weather information tailored for Umatilla County.

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