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United States weather

Weather in Boulder County, Colorado for December 2025

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

    Temperatures

  • Until now, December 2025 in Boulder County is slightly cooler than the historical average by -0.6 °F.

  • The forecast for the upcoming days in Boulder County predicts a temperature of 10.1 °F, which is slightly above the historical average.

  • In general, the average temperature in Boulder County at the beginning of December is 6.1 °F. As the month progressed, temperatures tended to slightly decrease, reaching an average of 5.7 °F by the end of December.

    • Rain 🌧️

  • Precipitation in Boulder County during December is a rare event, with an average of fewer than 2 rainy days.

    • More

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

Average dry days
31
Dry days
Average rainy days
0
Rainy days
Average snowy days
0
Snow days
Average temperatures
7°/-1°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
46 %
Avg humidity

Boulder County Weather December

Move between months or click on a day
November
January
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
5°
2
Sunny
6°
3
Sunny
5°
4
Sunny
5°
5
Partly cloudy
6°
6
Sunny
8°
7
Sunny
8°
8
Overcast
8°
9
Cloudy
5°
10
Sunny
3°
11
Patchy rain possible
8°
12
Overcast
6°
13
Sunny
13°
14
Cloudy
16°
15
Sunny
16°
16
Sunny
14°
17
Sunny
14°
18
Sunny
8°
19
Sunny
12°
20
Sunny
13°
21
Sunny
7°
22
Patchy rain possible
2°
23
Sunny
-2°
24
Sunny
11°
25
Sunny
7°
26
Cloudy
7°
27
Overcast
6°
28
Overcast
5°
29
Cloudy
9°
30
Cloudy
6°
31
Cloudy
0°

Temperatures trend during December in Boulder County

See the weather trend as well as the moving average line

December weather in Boulder County day by day

Click on a date for more information
November January
Date Weather Temperatures Rain UV More
Dec. 1 Sunny
Sunny
 5° /-5° 0 mm 3
Dec. 2 Sunny
Sunny
 6° /-3° 0 mm 3
Dec. 3 Sunny
Sunny
 5° /-4° 8.9 mm 3
Dec. 4 Sunny
Sunny
 5° /-3° 0 mm 3
Dec. 5 Partly cloudy
Partly cloudy
 6° /-1° 0 mm 2
Dec. 6 Sunny
Sunny
 8° /-2° 0 mm 3
Dec. 7 Sunny
Sunny
 8° /-1° 0 mm 3
Dec. 8 Overcast
Overcast
 8° /0° 0 mm 2
Dec. 9 Cloudy
Cloudy
 5° /-3° 0 mm 2
Dec. 10 Sunny
Sunny
 3° /-3° 0 mm 2
Dec. 11 Patchy rain possible
Patchy rain possible
 8° /-1° 0 mm 3
Dec. 12 Overcast
Overcast
 6° /-2° 0 mm 2
Dec. 13 Sunny
Sunny
 13° /2° 0 mm 0.4
Dec. 14 Cloudy
Cloudy
 16° /1° 0 mm 0.4
Dec. 15 Sunny
Sunny
 16° /6° 0 mm 0.4
Dec. 16 Sunny
Sunny
 14° /5° 0 mm 0.4
Dec. 17 Sunny
Sunny
 14° /6° 0 mm 0
Dec. 18 Sunny
Sunny
 8° /1° 0 mm 2
Dec. 19 Sunny
Sunny
 12° /2° 0 mm 3
Dec. 20 Sunny
Sunny
 13° /4° 0 mm 3
Dec. 21 Sunny
Sunny
 7° /-1° 0 mm 2
Dec. 22 Patchy rain possible
Patchy rain possible
 2° /-5° 0.5 mm 1
Dec. 23 Sunny
Sunny
 -2° /-7° 0 mm 2
Dec. 24 Sunny
Sunny
 11° /-3° 0 mm 2
Dec. 25 Sunny
Sunny
 7° /0° 0 mm 2
Dec. 26 Cloudy
Cloudy
 7° /-2° 0 mm 2
Dec. 27 Overcast
Overcast
 6° /1° 0 mm 2
Dec. 28 Overcast
Overcast
 5° /-2° 0 mm 2
Dec. 29 Cloudy
Cloudy
 9° /1° 0 mm 2
Dec. 30 Cloudy
Cloudy
 6° /-2° 0 mm 2
Dec. 31 Cloudy
Cloudy
 0° /-6° 0 mm 1
Next
Important Notice
Our weather forecast for Boulder 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 Boulder County forecast closer to your planned date for the most up-to-date weather information.
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Boulder County in December - FAQ

What are the expected maximum and minimum temperatures in Boulder County during December?
Prepare for cooler days with highs just around 7° and colder nights, dipping below -1°.
How much rainfall should be expected in Boulder County during December?
Rainfall in Boulder County during December is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 0 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.
Will it snow in Boulder County in December 2025?
Boulder County typically sees 0 cm of snowfall during December.
What are the typical wind conditions in Boulder County during December?
The average wind speed in Boulder County during December is 20 km/h, suggesting breezy to windy conditions, depending on your activities.

December rainfall patterns in Boulder County

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

Get accurate weather forecasts for Boulder County, located at latitude 40.015 and longitude -105.271. Stay updated with localized weather information tailored for Boulder County.

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