Keystone in December
8.3out of 10
Yes, a good time to go
Warm and comfortable: highs around 22°C. Some rain: about 6 rainy days.
22°CAvg high
12°CAvg low
6Rainy days (56 mm)
10:13 hDaylight
07:20Sunrise · 17:33 Sunset
Why this score
- Warm and comfortable: highs around 22°C
- Some rain: about 6 rainy days
What to wear and pack
- T-shirts and light layers
- A light jacket for cooler evenings
How reliable is the forecast?
Rainfall in December is fairly consistent from year to year (2.5 days). 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 | 21°C | 11°C | 63 mm | 7 | – | – | 8.1 |
| February | 22°C | 12°C | 56 mm | 6 | – | – | 8.2 |
| March | 25°C | 14°C | 64 mm | 6 | – | – | 8.2 |
| April | 28°C | 17°C | 54 mm | 6 | – | – | 8.2 |
| May | 31°C | 20°C | 59 mm | 8 | – | – | 7.7 |
| June | 32°C | 23°C | 127 mm | 16 | – | – | 6.0 |
| July | 32°C | 24°C | 127 mm | 19 | – | – | 5.6 |
| August | 32°C | 24°C | 144 mm | 20 | – | – | 5.3 |
| September | 31°C | 23°C | 117 mm | 15 | – | – | 6.3 |
| October | 29°C | 19°C | 53 mm | 7 | – | – | 8.1 |
| November | 25°C | 15°C | 36 mm | 5 | – | – | 8.5 |
| December | 22°C | 12°C | 56 mm | 6 | – | – | 8.3 |
Frequently asked questions
How hot is Keystone in December?
Daytime highs average 22°C and nights about 12°C.
When is the best time to visit Keystone?
The best months are November, December, February, March.