Ada County (Boise)
December
Weather in Ada County, Idaho for December 2026
Your guide to Ada County weather in December - trends and predictions
Ada County typically experiences moderate snowfall in December, with an average of 7 snowy days.
In general, the average temperature in Ada County at the beginning of December is 4.3 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 2.8 °C by the end of December.
Is December a good time to visit Ada County? check out the best time to travel to Ada County page.
✨ Is December a good time to visit Ada County? – Ask the AI Weatherman
Snow Forecast ❄️
Temperatures
More
18
Dry days
6
Rainy days
7
Snow days
4°/-1°
Temperatures
13 km/h
Avg max wind
82 %
Avg humidity
Ada County Weather December
Move between months or click on a day
Temperatures trend during December in Ada County
See the weather trend as well as the moving average line
December weather in Ada County day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Dec. 1 |  Light snow | 4° /-3° | 2 mm | 1.7 cm | |
| Dec. 2 |  Moderate snow | 4° /-1° | 11.3 mm | 6.9 cm | |
| Dec. 3 | Light snow | 3° /-2° | 22.3 mm | 2.6 cm | |
| Dec. 4 |  Patchy rain possible | 5° /-2° | 1.1 mm | 0 cm | |
| Dec. 5 |  Light rain | 4° /-1° | 3.7 mm | 0.7 cm | |
| Dec. 6 | Light rain | 5° /-1° | 7.4 mm | 0 cm | |
| Dec. 7 | Light snow | 6° /-1° | 2.3 mm | 1.2 cm | |
| Dec. 8 |  Light freezing rain | 4° /0° | 0.8 mm | 0.7 cm | |
| Dec. 9 | Light rain | 4° /-2° | 7.9 mm | 0.1 cm | |
| Dec. 10 | Patchy rain possible | 5° /-1° | 0.7 mm | 0.1 cm | |
| Dec. 11 | Light rain | 4° /-1° | 3.4 mm | 0.2 cm | |
| Dec. 12 | Light snow | 4° /1° | 4.7 mm | 3.4 cm | |
| Dec. 13 |  Sunny | 5° /0° | 0 mm | 0 cm | |
| Dec. 14 |  Heavy rain | 4° /0° | 36.6 mm | 1.4 cm | |
| Dec. 15 | Moderate snow | 3° /-2° | 7.6 mm | 5.5 cm | |
| Dec. 16 | Moderate snow | 5° /0° | 12.4 mm | 5.1 cm | |
| Dec. 17 | Moderate snow | 5° /0° | 14 mm | 6.5 cm | |
| Dec. 18 |  Moderate rain | 3° /0° | 15.7 mm | 3.4 cm | |
| Dec. 19 | Patchy light drizzle | 5° /0° | 1.4 mm | 0 cm | |
| Dec. 20 |  Cloudy | 4° /-2° | 0 mm | 0 cm | |
| Dec. 21 | Moderate rain | 4° /-1° | 14.5 mm | 0 cm | |
| Dec. 22 | Patchy rain possible | 6° /1° | 1.1 mm | 0 cm | |
| Dec. 23 | Light rain | 6° /1° | 4.5 mm | 0 cm | |
| Dec. 24 | Light rain | 4° /-1° | 5.5 mm | 0 cm | |
| Dec. 25 | Light rain | 4° /0° | 4.2 mm | 0 cm | |
| Dec. 26 |  Heavy snow | 2° /-1° | 28.7 mm | 19.7 cm | |
| Dec. 27 | Light snow | 1° /-3° | 8.9 mm | 3.4 cm | |
| Dec. 28 | Light snow | 2° /-2° | 30.8 mm | 4.9 cm | |
| Dec. 29 | Moderate rain | 3° /-2° | 14.8 mm | 0 cm | |
| Dec. 30 |  Overcast | 4° /-1° | 0.6 mm | 0.4 cm | |
| Dec. 31 |  Partly cloudy | 3° /-2° | 0 mm | 0 cm | |
| Next | |||||
Important Notice
Our weather forecast for Ada 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 Ada County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Ada County in December - FAQ
What are the expected maximum and minimum temperatures in Ada County during December?
Brace for cold days with temperatures not exceeding 4° and nights that are likely to be freezing. Winter clothing is essential for comfort and safety.
How much rainfall should be expected in Ada County during December?
Significant rainfall exceeding 269.1 mm is expected in Ada County during December, occurring over more than 6 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Ada County in December 2026?
Ada County experiences an average snowfall of 67.8 cm during December, occurring over 7 days.
What are the typical wind conditions in Ada County during December?
The average wind speed in Ada County during December is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
Ada County snow forecast December 2026
Track daily snowfall levels and discover Ada County’s snowy potential this December ❄️
On average, Ada County sees 7 snowy days during December, with approximately 67.8 cm of total snowfall.
December rainfall patterns in Ada County
Explore the daily rainfall trends and prepare for Ada Countys December weather 💧
Typically, Ada County has 6 rainy days in December with a total of 269.1 mm of rainfall.
Top locations in Ada County
Select a location for an accurate weather forecast
More Locations Quick links
More Ada County weather pages
You are here
Found a mistake?
We appreciate your attention to details. Tell us here.