Ada County (Boise)
December
Weather in Ada County, Idaho for December 2025
Your guide to Ada County weather in December - trends and predictions
Avalanche Warning - See hour by hour.
Expect heavy snowfall in Ada County during December, with an average of 16 snowy days.
According to Ada County snow forecast for December 2025, no snow is expected until the end of the month.So far, December 2025 in Ada County is slightly warmer than the historical average by 1.3 °F.
The forecast for the next days in Ada County predicts temperatures to be around 8 °F, close to the historical average.
In general, the average temperature in Ada County at the beginning of December is 4.6 °F. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 6.9 °F by the end of December.
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10
Dry days
5
Rainy days
16
Snow days
3°/-2°
Temperatures
12 km/h
Avg max wind
82 %
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 | 6° /0° | 0 mm | 0 cm | |
| Dec. 21 |  Heavy rain | 5° /2° | 37.9 mm | 0 cm | |
| Dec. 22 | Patchy rain possible | 7° /4° | 2.9 mm | 0 cm | |
| Dec. 23 |  Moderate rain | 10° /4° | 8.6 mm | 0 cm | |
| Dec. 24 | Moderate rain | 10° /4° | 11.2 mm | 0 cm | |
| Dec. 25 | Patchy rain possible | 10° /2° | 1.3 mm | 0 cm | |
| Dec. 26 | Patchy rain possible | 7° /3° | 0.4 mm | 0 cm | |
| Dec. 27 | Patchy rain possible | 9° /5° | 0.5 mm | 0 cm | |
| Dec. 28 | Partly cloudy | 6° /2° | 0.1 mm | 0 cm | |
| Dec. 29 | Sunny | 5° /-1° | 0 mm | 0 cm | |
| Dec. 30 | Partly cloudy | 5° /1° | 0 mm | 0 cm | |
| Dec. 31 | Patchy rain possible | 6° /5° | 0.4 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 3° 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 307.1 mm is expected in Ada County during December, occurring over more than 5 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Ada County in December 2025?
Ada County experiences an average snowfall of 95.61 cm during December, occurring over 16 days.
What are the typical wind conditions in Ada County during December?
The average wind speed in Ada County during December is 12 km/h, suggesting breezy to windy conditions, depending on your activities.
Ada County snow forecast December 2025
Track daily snowfall levels and discover Ada County’s snowy potential this December ❄️
On average, Ada County sees 16 snowy days during December, with approximately 95.6 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 5 rainy days in December with a total of 307.1 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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