Boise Weather in December
During December, Boise experiences low daytime temperatures of 4°C (39°F) and cooler nights around -5°C (23°F). As the wettest month of the year, and part of the winter season, expect frequent snow/rainfall.
Rainfall in Boise in December
Given that this is the rainiest month, it's wise to carry an umbrella to stay dry during unexpected showers. This month experiences about 14 days of snow/rain according to historical data, averaging 49 mm (1.9 in). A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.
Temperature in Boise in December
December in Boise brings low temperatures, with highs of 4°C (39°F) and nights around -5°C (23°F). Experience the winter season in December. Even daytime conditions remain cold, making layers, a warm coat, and winter accessories a good idea. Nights drop below freezing to -5°C (23°F). An extra blanket is worth packing if you're unsure about the heating where you're staying. It is a very cold month, so be prepared and make sure to dress up warm. It's always better to be prepared than to find oneself shivering in the cold.
Sunshine in Boise in December
The city usually sees around 103 hours of sunlight, indicating a moderately sunny period.December in Boise has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Boise's climate page.
Boise Temperature in December
Min Temperature
-5°C (23°F)
Max Temperature
4°C (39°F)
Chance of Rain
47%
Precipitation
49 mm (1.9 in)
Rainy days
14 days
Humidity
74%
Sunshine
103 hours
Percentage Sunshine
38%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Boise typically drop from around 5°C (41°F) at the start of December to approximately 2°C (36°F) by the end. Nights are very cold, with lows typically ranging from -6°C (21°F) to -2°C (28°F).
Average temperatures in December
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather for Boise in December
Browse day-by-day weather records for Boise spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Boise historical weather extremes in December
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Boise.
- The warmest day in December was on December 6, 1987, with a maximum of 17°C (63°F).
Best Places in the United States of America in December
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in December →
perfect weather
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unpleasant
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What to Wear in Boise in December
Dress warmly and in layers for your trip to Boise in December. A good base layer system works wonders. Start with good thermal underwear, add something warm like a fleece sweater, then finish with a waterproof jacket on top. Wet weather is likely, so pack waterproof gear for multiple rainy days. Sunglasses could come in handy during the sunnier parts of your trip.What To Do in Boise in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Boise's climate page.
Temperature Rainfall Sunshine Humidity
See the full Boise climate overview or explore weather in the United States of America.
