Idaho Falls in December
3.8out of 10
Not the best time
Cold: highs around 0°C. Frequent rain: about 9 rainy days.
0°CAvg high
-8°CAvg low
9Rainy days (38 mm)
8:47 hDaylight
08:01Sunrise · 16:48 Sunset
Why this score
- Cold: highs around 0°C
- Frequent rain: about 9 rainy days
- Nights fall to about -8°C
What to wear and pack
- Winter coat, hat and scarf
- Rain jacket or compact umbrella
- Gloves for freezing mornings
How reliable is the forecast?
Rain in December varies a lot between years (±3.4 rainy days), so check the forecast closer to your trip. Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 0°C | -8°C | 36 mm | 10 | – | – | 3.8 |
| February | 3°C | -6°C | 28 mm | 8 | – | – | 4.4 |
| March | 9°C | -2°C | 36 mm | 9 | – | – | 5.6 |
| April | 14°C | 2°C | 45 mm | 11 | – | – | 6.3 |
| May | 20°C | 6°C | 53 mm | 10 | – | – | 7.4 |
| June | 26°C | 10°C | 31 mm | 6 | – | – | 8.3 |
| July | 31°C | 14°C | 12 mm | 4 | – | – | 8.0 |
| August | 30°C | 13°C | 14 mm | 4 | – | – | 8.2 |
| September | 24°C | 8°C | 24 mm | 4 | – | – | 8.5 |
| October | 16°C | 3°C | 33 mm | 6 | – | – | 7.2 |
| November | 6°C | -3°C | 30 mm | 8 | – | – | 5.2 |
| December | 0°C | -8°C | 38 mm | 9 | – | – | 3.8 |
Frequently asked questions
How hot is Idaho Falls in December?
Daytime highs average 0°C and nights about -8°C.
When is the best time to visit Idaho Falls?
The best months are September, June, August, July.