Ada County (Boise)
December
Weather in Ada County, Idaho for December 2026
Your guide to Ada County weather in December - trends and predictions
Expect heavy snowfall in Ada County during December, with an average of 18 snowy days.
In general, the average temperature in Ada County at the beginning of December is 4.6 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 3.3 °C by the end of December.
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Snow Forecast ❄️
Temperatures
More
3
Dry days
10
Rainy days
18
Snow days
4°/-1°
Temperatures
13 km/h
Avg max wind
81 %
Avg humidity
Ada County Weather December
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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
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Dec. 1 |  Heavy snow | 4° /-3° | 2 mm | 1.7 cm | |
| Dec. 2 | Heavy snow | 4° /-2° | 11.3 mm | 6.9 cm | |
| Dec. 3 | Heavy snow | 3° /-2° | 22.3 mm | 2.6 cm | |
| Dec. 4 |  Fog | 5° /-3° | 1.1 mm | 0 cm | |
| Dec. 5 |  Freezing fog | 5° /-1° | 3.7 mm | 0.7 cm | |
| Dec. 6 |  Light drizzle | 5° /-1° | 7.4 mm | 0 cm | |
| Dec. 7 | Mist | 6° /-1° | 2.3 mm | 1.2 cm | |
| Dec. 8 |  Light freezing rain | 4° /-1° | 0.8 mm | 0.7 cm | |
| Dec. 9 |  Overcast | 4° /-2° | 7.9 mm | 0.1 cm | |
| Dec. 10 |  Moderate snow | 5° /-1° | 0.7 mm | 0.1 cm | |
| Dec. 11 | Heavy snow | 4° /-1° | 3.4 mm | 0.2 cm | |
| Dec. 12 |  Light snow | 4° /0° | 4.7 mm | 3.4 cm | |
| Dec. 13 |  Sunny | 6° /0° | 0 mm | 0 cm | |
| Dec. 14 |  Patchy rain possible | 4° /0° | 36.6 mm | 1.4 cm | |
| Dec. 15 | Sunny | 3° /-2° | 7.6 mm | 5.5 cm | |
| Dec. 16 |  Partly cloudy | 5° /0° | 12.4 mm | 5.1 cm | |
| Dec. 17 | Sunny | 5° /0° | 14 mm | 6.5 cm | |
| Dec. 18 | Patchy rain possible | 3° /-1° | 15.7 mm | 3.4 cm | |
| Dec. 19 | Patchy light drizzle | 6° /-1° | 1.4 mm | 0 cm | |
| Dec. 20 |  Cloudy | 5° /-2° | 0 mm | 0 cm | |
| Dec. 21 | Partly cloudy | 4° /-2° | 14.5 mm | 0 cm | |
| Dec. 22 | Partly cloudy | 7° /0° | 1.1 mm | 0 cm | |
| Dec. 23 | Sunny | 6° /0° | 4.5 mm | 0 cm | |
| Dec. 24 | Overcast | 4° /-1° | 5.5 mm | 0 cm | |
| Dec. 25 | Overcast | 4° /0° | 4.2 mm | 0 cm | |
| Dec. 26 | Heavy snow | 3° /-1° | 28.7 mm | 19.7 cm | |
| Dec. 27 | Partly cloudy | 2° /-3° | 8.9 mm | 3.4 cm | |
| Dec. 28 | Cloudy | 3° /-2° | 30.8 mm | 4.9 cm | |
| Dec. 29 | Partly cloudy | 4° /-2° | 14.8 mm | 0 cm | |
| Dec. 30 | Overcast | 4° /-1° | 0.6 mm | 0.4 cm | |
| Dec. 31 | Partly cloudy | 3° /-3° | 0 mm | 0 cm | |
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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.
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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 10 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 67.7867 cm during December, occurring over 18 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 18 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 10 rainy days in December with a total of 269.1 mm of rainfall.
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Where is Ada County?Get accurate weather forecasts for Ada County, located at latitude 43.614 and longitude -116.203. Stay updated with localized weather information tailored for Ada County.
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