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United States weather

Weather in Umatilla County, Oregon for December 2026

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

    Snow Forecast ❄️

  • Snowfall in Umatilla County during December is quite rare, with fewer than 2 snowy days on average.

    • Temperatures

  • In general, the average temperature in Umatilla County at the beginning of December is 4.4 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 6.4 °C by the end of December.

    • Rain 🌧️

  • Umatilla County in December brings notable rainfall, with an average of 20 rainy days and a total precipitation of 137.4 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
10
Dry days
Average rainy days
20
Rainy days
Average snowy days
1
Snow days
Average temperatures
7°/2°
Temperatures
Average wind speed
19 km/h
Avg max wind
Average humidity
81 %
Avg humidity

Umatilla County Weather December

Move between months or click on a day
November
January
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Cloudy
2°
2
Cloudy
2°
3
Overcast
3°
4
Overcast
4°
5
Overcast
7°
6
Overcast
5°
7
Moderate or heavy rain shower
8°
8
Patchy rain possible
10°
9
Partly cloudy
9°
10
Overcast
8°
11
Cloudy
10°
12
Light freezing rain
7°
13
Moderate rain at times
11°
14
Moderate or heavy rain shower
11°
15
Patchy rain possible
11°
16
Moderate or heavy rain shower
8°
17
Moderate or heavy rain shower
11°
18
Overcast
12°
19
Cloudy
9°
20
Overcast
7°
21
Heavy rain at times
7°
22
Heavy rain at times
9°
23
Overcast
9°
24
Moderate or heavy rain shower
11°
25
Heavy rain at times
9°
26
Moderate or heavy rain shower
9°
27
Moderate or heavy rain shower
5°
28
Overcast
5°
29
Patchy rain possible
7°
30
Patchy rain possible
6°
31
Partly cloudy
4°

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

Click on a date for more information
November January
Date Weather Temperatures Rain Snow More
Dec. 1 Cloudy
Cloudy
 2° /-3° 0 mm 0 cm
Dec. 2 Cloudy
Cloudy
 2° /0° 1.7 mm 0 cm
Dec. 3 Overcast
Overcast
 3° /0° 0 mm 0 cm
Dec. 4 Overcast
Overcast
 4° /0° 15.2 mm 0 cm
Dec. 5 Overcast
Overcast
 7° /1° 3.3 mm 0 cm
Dec. 6 Overcast
Overcast
 5° /2° 0 mm 0 cm
Dec. 7 Moderate or heavy rain shower
Moderate or heavy rain shower
 8° /2° 9.1 mm 0 cm
Dec. 8 Patchy rain possible
Patchy rain possible
 10° /5° 0.4 mm 0 cm
Dec. 9 Partly cloudy
Partly cloudy
 9° /3° 13.4 mm 0 cm
Dec. 10 Overcast
Overcast
 8° /5° 0 mm 0 cm
Dec. 11 Cloudy
Cloudy
 10° /4° 0 mm 0 cm
Dec. 12 Light freezing rain
Light freezing rain
 7° /2° 1.5 mm 0 cm
Dec. 13 Moderate rain at times
Moderate rain at times
 11° /1° 2.3 mm 0 cm
Dec. 14 Moderate or heavy rain shower
Moderate or heavy rain shower
 11° /3° 5.1 mm 0 cm
Dec. 15 Patchy rain possible
Patchy rain possible
 11° /4° 0.1 mm 0 cm
Dec. 16 Moderate or heavy rain shower
Moderate or heavy rain shower
 8° /4° 5.2 mm 0 cm
Dec. 17 Moderate or heavy rain shower
Moderate or heavy rain shower
 11° /2° 9.8 mm 0 cm
Dec. 18 Overcast
Overcast
 12° /3° 10.6 mm 0 cm
Dec. 19 Cloudy
Cloudy
 9° /1° 4.8 mm 2 cm
Dec. 20 Overcast
Overcast
 7° /1° 0 mm 0 cm
Dec. 21 Heavy rain at times
Heavy rain at times
 7° /1° 4.1 mm 0 cm
Dec. 22 Heavy rain at times
Heavy rain at times
 9° /2° 3.3 mm 0 cm
Dec. 23 Overcast
Overcast
 9° /3° 2.2 mm 0 cm
Dec. 24 Moderate or heavy rain shower
Moderate or heavy rain shower
 11° /2° 9.5 mm 0 cm
Dec. 25 Heavy rain at times
Heavy rain at times
 9° /1° 4.7 mm 0 cm
Dec. 26 Moderate or heavy rain shower
Moderate or heavy rain shower
 9° /3° 17.8 mm 0 cm
Dec. 27 Moderate or heavy rain shower
Moderate or heavy rain shower
 5° /1° 7.3 mm 0 cm
Dec. 28 Overcast
Overcast
 5° /1° 2.5 mm 0 cm
Dec. 29 Patchy rain possible
Patchy rain possible
 7° /2° 3.4 mm 0 cm
Dec. 30 Patchy rain possible
Patchy rain possible
 6° /0° 0.1 mm 0 cm
Dec. 31 Partly cloudy
Partly cloudy
 4° /-1° 0 mm 0 cm
Next
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.
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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 7° and colder nights, dipping below 2°.

How much rainfall should be expected in Umatilla County during December?

Significant rainfall exceeding 137.4 mm is expected in Umatilla County during December, occurring over more than 20 days. Preparing for wet conditions is recommended in your planning.

Will it snow in Umatilla County in December 2026?

Umatilla County typically sees 2.025 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 19 km/h, suggesting breezy to windy conditions, depending on your activities.

Umatilla County snow forecast December 2026

Track daily snowfall levels and discover Umatilla County’s snowy potential this December ❄️
On average, Umatilla County sees 1 snowy days during December, with approximately 2 cm of total snowfall.

December rainfall patterns in Umatilla County

Explore the daily rainfall trends and prepare for Umatilla Countys December weather 💧
Typically, Umatilla County has 20 rainy days in December with a total of 137.4 mm of rainfall.
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Pendleton
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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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