Weather in Boulder in December
Boulder, United States averages a high of 4.5°C (40.1°F) and low of -8.5°C (16.7°F) in December, with 5 rain days and 8.1 hours of daily sunshine. Travel score: 58.3/100 (Mixed). The best time to visit Boulder is August.
High
5°C40°F
Low
-8°C17°F
🌧️
5
rain days
☀️
8.1
hrs/day sunshine
💧
62%
humidity
58— Mixed
December in Boulder is cold and mostly dry — bring heavy winter clothing.
What are the average temperatures in Boulder?
How much does it rain in Boulder in December?
Boulder receives an average of 22.8mm of rainfall across 5 rainy days in December. The annual total is 586.4mm.
What should I pack for Boulder in December?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
🧥
Heavy winter coat
Cold weather with highs around 5°C
🩳
Thermal base layers
Stay warm in freezing temperatures
🧤
Warm gloves
Cold nights around -8°C
🧣
Warm scarf
Protect against cold winds
Traveling to United States in December?
Don't let a public holiday surprise you — restaurants, shops, and attractions may be closed.
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Data based on 1994–2024 averages · Last updated: 2024-12-31