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United States weather

Weather in Boulder County, Colorado for December 2026

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

    Snow Forecast ❄️

  • With an average of 2 snowy days, Boulder County usually enjoys a light touch of snow in December.

    • Temperatures

  • In general, the average temperature in Boulder County at the beginning of December is 6.1 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 7 °C 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
29
Dry days
Average rainy days
0
Rainy days
Average snowy days
2
Snow days
Average temperatures
8°/0°
Temperatures
Average wind speed
23 km/h
Avg max wind
Average humidity
46 %
Avg humidity

Boulder County Weather December

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

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 Snow More
Dec. 1 Sunny
Sunny
 5° /-5° 0 mm 0 cm
Dec. 2 Sunny
Sunny
 6° /-3° 0 mm 0 cm
Dec. 3 Sunny
Sunny
 5° /-4° 8.9 mm 6.5 cm
Dec. 4 Sunny
Sunny
 5° /-3° 0 mm 0 cm
Dec. 5 Partly cloudy
Partly cloudy
 6° /-1° 0 mm 0 cm
Dec. 6 Sunny
Sunny
 8° /-2° 0 mm 0 cm
Dec. 7 Sunny
Sunny
 8° /-1° 0 mm 0 cm
Dec. 8 Overcast
Overcast
 8° /0° 0 mm 0 cm
Dec. 9 Cloudy
Cloudy
 5° /-3° 0 mm 0 cm
Dec. 10 Sunny
Sunny
 3° /-3° 0 mm 0 cm
Dec. 11 Patchy rain possible
Patchy rain possible
 8° /-1° 0 mm 0 cm
Dec. 12 Overcast
Overcast
 8° /0° 0 mm 0 cm
Dec. 13 Overcast
Overcast
 9° /0° 0 mm 0 cm
Dec. 14 Sunny
Sunny
 13° /0° 0 mm 0 cm
Dec. 15 Sunny
Sunny
 12° /3° 0 mm 0 cm
Dec. 16 Sunny
Sunny
 9° /0° 0 mm 0 cm
Dec. 17 Cloudy
Cloudy
 9° /2° 0 mm 0 cm
Dec. 18 Overcast
Overcast
 6° /-3° 0 mm 0 cm
Dec. 19 Sunny
Sunny
 10° /2° 0 mm 0 cm
Dec. 20 Partly cloudy
Partly cloudy
 11° /1° 0 mm 0 cm
Dec. 21 Sunny
Sunny
 12° /3° 0 mm 0 cm
Dec. 22 Overcast
Overcast
 15° /4° 0 mm 0 cm
Dec. 23 Partly cloudy
Partly cloudy
 12° /4° 0 mm 0 cm
Dec. 24 Overcast
Overcast
 11° /2° 0 mm 0 cm
Dec. 25 Overcast
Overcast
 11° /4° 0 mm 0 cm
Dec. 26 Cloudy
Cloudy
 10° /1° 0 mm 0 cm
Dec. 27 Overcast
Overcast
 7° /0° 0 mm 0 cm
Dec. 28 Overcast
Overcast
 2° /-6° 11.4 mm 8.2 cm
Dec. 29 Cloudy
Cloudy
 7° /-3° 0 mm 0 cm
Dec. 30 Cloudy
Cloudy
 7° /-2° 0 mm 0 cm
Dec. 31 Cloudy
Cloudy
 5° /-4° 0 mm 0 cm
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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 8° and colder nights, dipping below 0°.

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

In December, Boulder County can expect light to moderate rainfall, totaling 20.4 mm across approximately 0 days. Occasional showers are possible, and planning ahead for them could be helpful.

Will it snow in Boulder County in December 2026?

Boulder County experiences an average snowfall of 14.7 cm during December, occurring over 2 days.

What are the typical wind conditions in Boulder County during December?

The average wind speed in Boulder County during December is 23 km/h, suggesting breezy to windy conditions, depending on your activities.

Boulder County snow forecast December 2026

Track daily snowfall levels and discover Boulder County’s snowy potential this December ❄️
On average, Boulder County sees 2 snowy days during December, with approximately 14.7 cm of total snowfall.

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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