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United States weather

Weather in Tri-Cities, Washington for December 2025

Your guide to Tri-Cities weather in December - trends and predictions

    Snow Forecast ❄️

  • With an average of 2 snowy days, Tri-Cities usually enjoys a light touch of snow in December.
    According to Tri-Cities snow forecast for December 2025, no snow is expected until the end of the month.

    • Temperatures

  • So far, December 2025 in Tri-Cities shows a warmer trend than usual by 2.1 °F.

  • The forecast for the next days in Tri-Cities predicts temperatures to be around 7 °F, close to the historical average.

  • In general, the average temperature in Tri-Cities at the beginning of December is 6.1 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 7.3 °F by the end of December.

    • Rain 🌧️

  • Tri-Cities in December brings notable rainfall, with an average of 17 rainy days and a total precipitation of 119.4 mm.

    • More

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

Average dry days
12
Dry days
Average rainy days
17
Rainy days
Average snowy days
2
Snow days
Average temperatures
5°/0°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
86 %
Avg humidity

Tri-Cities Weather December

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

Temperatures trend during December in Tri-Cities

See the weather trend as well as the moving average line

December weather in Tri-Cities day by day

Click on a date for more information
November January
Date Weather Temperatures Rain UV More
Dec. 1 Mist
Mist
 4° /-3° 1.2 mm 1
Dec. 2 Overcast
Overcast
 4° /-1° 0 mm 2
Dec. 3 Moderate rain
Moderate rain
 5° /0° 3.1 mm 2
Dec. 4 Light rain
Light rain
 5° /1° 2.4 mm 2
Dec. 5 Light rain
Light rain
 8° /1° 4.1 mm 2
Dec. 6 Patchy rain possible
Patchy rain possible
 8° /2° 0.8 mm 2
Dec. 7 Light rain
Light rain
 9° /1° 4.8 mm 2
Dec. 8 Mist
Mist
 10° /3° 0 mm 2
Dec. 9 Light drizzle
Light drizzle
 7° /1° 0.3 mm 2
Dec. 10 Moderate rain
Moderate rain
 7° /2° 4.1 mm 2
Dec. 11 Overcast
Overcast
 9° /2° 0.1 mm 2
Dec. 12 Overcast
Overcast
 6° /2° 0 mm 2
Dec. 13 Partly cloudy
Partly cloudy
 6° /0° 0 mm 2
Dec. 14 Cloudy
Cloudy
 7° /2° 4.3 mm 2
Dec. 15 Overcast
Overcast
 8° /2° 0 mm 2
Dec. 16 Overcast
Overcast
 7° /2° 7.3 mm 2
Dec. 17 Sunny
Sunny
 8° /2° 4.8 mm 3
Dec. 18 Light drizzle
Light drizzle
 9° /2° 3.1 mm 2
Dec. 19 Patchy rain possible
Patchy rain possible
 7° /1° 0 mm 2
Dec. 20 Partly cloudy
Partly cloudy
 8° /2° 0 mm 2
Dec. 21 Overcast
Overcast
 7° /2° 0 mm 0
Dec. 22 Partly cloudy
Partly cloudy
 8° /2° 0 mm 0.2
Dec. 23 Cloudy
Cloudy
 8° /2° 0 mm 0.1
Dec. 24 Moderate rain
Moderate rain
 4° /3° 5.6 mm 0
Dec. 25 Patchy rain possible
Patchy rain possible
 8° /3° 1.7 mm 0
Dec. 26 Cloudy
Cloudy
 7° /3° 0 mm 1
Dec. 27 Patchy rain possible
Patchy rain possible
 7° /3° 0.7 mm 1
Dec. 28 Sunny
Sunny
 7° /3° 0 mm 2
Dec. 29 Partly cloudy
Partly cloudy
 5° /1° 0 mm 2
Dec. 30 Patchy rain possible
Patchy rain possible
 8° /4° 1.4 mm 2
Dec. 31 Patchy rain possible
Patchy rain possible
 9° /8° 0.3 mm 2
Next
Important Notice
Our weather forecast for Tri-Cities 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 Tri-Cities forecast closer to your planned date for the most up-to-date weather information.
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Tri-Cities in December - FAQ

What are the expected maximum and minimum temperatures in Tri-Cities during December?
Brace for cold days with temperatures not exceeding 5° and nights that are likely to be freezing. Winter clothing is essential for comfort and safety.
How much rainfall should be expected in Tri-Cities during December?
Significant rainfall exceeding 119.4 mm is expected in Tri-Cities during December, occurring over more than 17 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Tri-Cities in December 2025?
Tri-Cities experiences an average snowfall of 1.235 cm during December, occurring over 2 days.
What are the typical wind conditions in Tri-Cities during December?
The average wind speed in Tri-Cities during December is 16 km/h, suggesting breezy to windy conditions, depending on your activities.

December rainfall patterns in Tri-Cities

Explore the daily rainfall trends and prepare for Tri-Citiess December weather 💧
Typically, Tri-Cities has 17 rainy days in December with a total of 119.4 mm of rainfall.

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Location coordinates Where is Tri-Cities?

Get accurate weather forecasts for Tri-Cities, located at latitude 46.245 and longitude -119.196. Stay updated with localized weather information tailored for Tri-Cities.

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