Idaho weather in December: Statewide normals and every place, NOAA 1991-2020
In December, Idaho's statewide normal high is 32°F and normal low 17°F; normal highs run from 26°F in Island Park to 44°F in Glenns Ferry (NOAA 1991-2020 normals).
- Statewide normal high
- 32°FDecember, 1991-2020
- Statewide normal low
- 17°FDecember, 1991-2020
- Statewide normal precipitation
- 3.04 inDecember
- Warmest place
- 44°Fnormal high, Glenns Ferry
- Coolest place
- 26°Fnormal high, Island Park
Where is Idaho warmest and wettest in December?
Glenns Ferry has the warmest December afternoons (44°F) and Island Park the coolest (26°F). Mullan gets the most precipitation (6.04 in) and Challis the least (0.52 in). The most snow falls in Ketchum (32.0 inches).
Statewide, December averaged 26.5°F in 2021, 22.8°F in 2022, 29.6°F in 2023, 30.2°F in 2024, 33.4°F in 2025, against a 1991-2020 normal of 24.6°F.
| Place | High | Low | Precip. | Snow |
|---|---|---|---|---|
| Boise | 39°F | 25°F | 1.54 | 5.6 |
| Nampa | 40°F | 23°F | 1.39 | 4.2 |
| Idaho Falls | 30°F | 13°F | 0.78 | – |
| Pocatello | 34°F | 17°F | 1.13 | 10.1 |
| Coeur d'Alene | 36°F | 26°F | 3.47 | – |
| Twin Falls | 37°F | 20°F | 1.23 | – |
| Rexburg | 29°F | 14°F | 0.99 | – |
| Lewiston | 41°F | 30°F | 1.13 | 4.1 |
| Moscow | 36°F | 22°F | 3.47 | 15.5 |
| Mountain Home | 39°F | 23°F | – | – |
| Jerome | 36°F | 23°F | 1.31 | – |
| Blackfoot | 32°F | 18°F | 1.11 | 3.3 |
| Burley | 37°F | 21°F | 1.06 | – |
| Sandpoint | 34°F | 23°F | 4.61 | 19.3 |
| Emmett | 39°F | 24°F | 2.12 | 3.6 |
| Payette | 40°F | 24°F | 1.75 | – |
| Preston | 34°F | 17°F | 1.57 | 14.1 |
| Weiser | 37°F | 23°F | 2.37 | – |
| Rigby | 30°F | 16°F | 1.31 | – |
| American Falls | 35°F | 20°F | 0.87 | – |
| Buhl | 37°F | 23°F | 1.20 | – |
| McCall | 30°F | 14°F | 2.83 | – |
| St. Anthony | 29°F | 13°F | 1.41 | – |
| Grangeville | 37°F | 24°F | 1.79 | 9.6 |
| Ketchum | 30°F | 9°F | 2.57 | 32.0 |
| Salmon | 29°F | 13°F | 0.73 | 6.4 |
| Soda Springs | 33°F | 10°F | 1.19 | – |
| Homedale | 39°F | 23°F | 1.18 | – |
| Bonners Ferry | 33°F | 24°F | 3.17 | 17.3 |
| Bellevue | 34°F | 17°F | 2.44 | – |
| St. Maries | 36°F | 24°F | 4.44 | 18.3 |
| Kellogg | 36°F | 22°F | 3.45 | 13.8 |
| Sugar City | 30°F | 11°F | – | – |
| Fort Hall | 33°F | 15°F | 0.98 | 7.5 |
| Driggs | 33°F | 11°F | 1.74 | – |
| Malad City | 34°F | 16°F | 1.11 | – |
| Parma | 38°F | 23°F | 1.12 | 4.8 |
| Aberdeen | 33°F | 15°F | 0.99 | 7.5 |
| Shoshone | 38°F | 24°F | 1.72 | – |
| Paul | 34°F | 19°F | 1.24 | – |
| Glenns Ferry | 44°F | 25°F | 1.56 | – |
| Kamiah | 36°F | 26°F | 1.98 | 5.7 |
| Plummer | 35°F | 23°F | 3.35 | – |
| Cascade | 32°F | 16°F | 3.51 | 26.4 |
| Hagerman | 38°F | 22°F | 1.58 | – |
| Ashton | 29°F | 15°F | 2.26 | 20.2 |
| Council | 36°F | 19°F | 2.98 | – |
| Grace | 32°F | 14°F | 0.99 | – |
| Challis | 29°F | 11°F | 0.52 | – |
| Cottonwood | 36°F | 24°F | 1.93 | 16.5 |
| Arco | 31°F | 9°F | 0.86 | 8.1 |
| Oakley | 39°F | 21°F | 0.79 | 5.2 |
| Hazelton | 36°F | 20°F | 1.55 | – |
| McCammon | 34°F | 17°F | 1.73 | 12.9 |
| Wallace | 33°F | 24°F | 4.56 | 22.7 |
| Potlatch | 36°F | 25°F | 2.90 | 10.6 |
| Mullan | 27°F | 18°F | 6.04 | – |
| New Meadows | 31°F | 13°F | 4.05 | – |
| Downey | 34°F | 16°F | 1.07 | – |
| Kooskia | 38°F | 24°F | – | – |
| Idaho City | 35°F | 14°F | 3.53 | – |
| Dubois | 30°F | 16°F | 0.99 | 13.7 |
| Pierce | 34°F | 19°F | 5.70 | 31.6 |
| Fairfield | 28°F | 10°F | 1.98 | – |
| Mackay | 29°F | 10°F | 0.87 | – |
| Richfield | 33°F | 15°F | 1.66 | 6.9 |
| Nezperce | 34°F | 21°F | 1.55 | 8.4 |
| Grand View | 40°F | 23°F | 0.88 | – |
| Riggins | 40°F | 25°F | 1.44 | 2.0 |
| Lava Hot Springs | 33°F | 15°F | 1.70 | – |
| Winchester | 35°F | 22°F | 1.78 | 14.5 |
| Cambridge | 32°F | 19°F | 3.86 | – |
| Garden Valley | 33°F | 20°F | 4.96 | 24.2 |
| Swan Valley | 32°F | 12°F | 1.44 | – |
| Tetonia | 27°F | 9°F | 2.07 | – |
| Elk City | 33°F | 14°F | 2.78 | 26.4 |
| Castleford | 35°F | 19°F | 1.30 | – |
| Island Park | 26°F | 6°F | 4.01 | – |
| Malta | 36°F | 17°F | 0.70 | 3.1 |
| Stanley | 28°F | 6°F | 1.92 | – |
| Leadore | 29°F | 6°F | – | – |
| Minidoka | 37°F | 19°F | 1.18 | 4.6 |
| Hamer | 30°F | 9°F | 0.80 | 6.8 |
| Lowman | 33°F | 16°F | – | – |
| Bruneau | 43°F | 26°F | 0.95 | – |
| Arrowrock Dam | 37°F | 24°F | – | – |
| Bayview Model Basin | 34°F | 22°F | 3.58 | 12.1 |
| Bern | 30°F | 9°F | 1.71 | 20.6 |
| Boise Lucky Peak Dam | 40°F | 25°F | 2.34 | – |
| Brownlee Dam | 40°F | 29°F | 2.03 | – |
| Cabinet Gorge | 34°F | 24°F | 3.64 | – |
| Chilly Barton Flat | 30°F | 9°F | 0.44 | 4.5 |
| Craters Of The Moon | 24°F | 8°F | 2.19 | 22.9 |
| Deadwood Lodge | 31°F | 9°F | 7.49 | – |
| Deer Flat Dam | 40°F | 24°F | 1.11 | – |
| Dixie | 31°F | 6°F | – | – |
| Dixie N | 28°F | 6°F | 4.79 | – |
| Dworshak Fish Hatchery | 39°F | 28°F | 3.18 | 8.1 |
| Elk River | 33°F | 21°F | 5.69 | – |
| Fenn Ranger Station | 36°F | 27°F | 4.70 | 17.0 |
| Gibbonsville #2 | 30°F | 12°F | – | – |
| Headquarters | 33°F | 20°F | 5.58 | 31.6 |
| Hill City (1 mi W) | 30°F | 11°F | 2.72 | – |
| Howe | 30°F | 11°F | 0.38 | 4.2 |
| Idaho Falls (46 mi W) | 29°F | 7°F | 0.70 | 7.6 |
| Idaho Falls - Kifi | 31°F | 17°F | 1.14 | – |
| Lifton Pumping Station | 30°F | 10°F | 0.75 | 7.2 |
| Lowell Three Rivers | 38°F | 29°F | 4.30 | – |
| Massacre Rocks State Park | 35°F | 18°F | 1.35 | – |
| May (2 mi SSE) | 32°F | 9°F | 0.32 | – |
| Middle Fork Lodge | 33°F | 15°F | 1.79 | 12.5 |
| Monteview | 28°F | 7°F | 0.77 | – |
| Murphy (10 mi W) | 38°F | 21°F | 1.40 | – |
| Murphy (Desert) Hot Springs | 40°F | 16°F | 1.29 | 9.9 |
| Ola | 38°F | 17°F | 3.89 | – |
| Picabo | 32°F | 9°F | 1.80 | 15.2 |
| Porthill (1 mi SW) | 36°F | 21°F | 2.45 | – |
| Powell | 30°F | 18°F | – | – |
| Prichard (3 mi ESE) | 32°F | 22°F | 5.57 | – |
| Priest River Experiment Station | 31°F | 22°F | 4.53 | 25.7 |
| Red River Ranger Station | 33°F | 15°F | – | – |
| Rexburg BYU Idaho | 30°F | 15°F | 1.08 | – |
| Shoup | 31°F | 19°F | – | – |
| Silver City (5 mi W) | 35°F | 22°F | – | – |
| Small (6 mi N) | 29°F | 12°F | 1.23 | – |
| Swan Falls Powerhouse | 42°F | 26°F | 0.93 | – |
| Taylor Ranch | 30°F | 17°F | 1.09 | 8.1 |
| Twin Falls-KMVT | 40°F | 23°F | 1.31 | – |
| Warren | 34°F | 9°F | – | – |
| Yellowpine | 34°F | 15°F | 2.97 | – |
| Yellowpine Bar | 36°F | 22°F | 2.08 | 15.6 |
Source: NOAA NCEI nClimDiv statewide normals; NOAA NCEI 1991-2020 monthly normals for each station.