Boise in December
In December, Boise averages 4°C (39°F) during the day and -3°C (26°F) at night, with around 12 days of rain (55 mm total).
Off-peakConditions are cold — pack winter layers. Plan for unsettled weather and bring rain gear.
December in Boise is outside the typical sweet spot for sightseeing weather. It can still be a great time to visit if you have specific reasons (festivals, off-season pricing, etc.).
How December compares to the rest of the year in Boise
December is one of the coolest months in Boise (12th of 12) and one of the wettest months (1st of 12). Daytime temperature runs 15°C below the annual average (19°C). December runs 6°C cooler than November (10°C) and warms a further 1°C into January (4°C).
December sunrise & sunset in Boise
Times shown for Boise local time (America/Boise), calculated for the 15th of December. They shift by a few minutes day to day across the month.
Photography light in Boise — December
Golden-hour and blue-hour windows for the 15th of December, in Boise's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Boise in December
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on December's tier (Off-peak) and Boise's popularity.
December in United States — events that affect travel
Known cultural, religious, or national events that surge prices, fill hotels, or close businesses during this month. Plan around them, or build your itinerary around the ones you'd like to see.
Major travel surge plus widespread Dec 24-26 and Jan 1 business closures.
Plan: Book flights and hotels well ahead; expect many restaurants/shops closed Dec 25 and Jan 1.
Crowds & pricing — December in Boise
This is off-peak for Boise — the lowest prices of the year and the fewest crowds, but with real trade-offs: some restaurants, hotels, and beach businesses may close for the season; weather conditions can make outdoor activities unpredictable; and a handful of seasonal sights run reduced hours or close entirely. Great if you prefer a quiet local rhythm and don't mind the climate giving you reasons to choose indoor activities.
Why this tier: challenging tourism weather Christmas / New Year travel surge
Sun & mosquito risk — December in Boise
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
🥶 Bitter cold — Boise in December
Gear: Snow rare but air is freezing. Insulated coat, hat, and gloves still required — wind chill is the real enemy.
Boise in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 4°C / 40°F | -4°C / 26°F | 43 mm | 10 | — |
| February | 8°C / 46°F | -2°C / 29°F | 38 mm | 9 | — |
| March | 13°C / 56°F | 2°C / 35°F | 39 mm | 9 | — |
| April | 18°C / 64°F | 4°C / 40°F | 31 mm | 7 | — |
| May | 23°C / 74°F | 9°C / 48°F | 39 mm | 8 | — |
| June | 29°C / 84°F | 14°C / 57°F | 22 mm | 3 | — |
| July | 35°C / 95°F | 19°C / 65°F | 2 mm | 1 | — |
| August | 34°C / 92°F | 18°C / 64°F | 5 mm | 1 | — |
| September | 28°C / 82°F | 13°C / 55°F | 15 mm | 3 | — |
| October | 19°C / 66°F | 7°C / 44°F | 26 mm | 5 | — |
| November | 10°C / 50°F | 0°C / 33°F | 37 mm | 8 | — |
| December | 4°C / 39°F | -3°C / 26°F | 55 mm | 12 | — |
Other cities with similar December weather
🌍 See the full ranked list of climate twins for Boise in December →
Frequently asked questions
How hot is Boise in December?
In December, Boise averages a high of 4°C (39°F) and a low of -3°C (26°F) — generally cold.
Does it rain a lot in Boise in December?
December can be fairly wet in Boise, with about 12 rainy days on average.
Is December a good time to visit Boise?
December is cold. It suits travelers who are comfortable with cold weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Boise in December?
Pack heavy winter layers, a coat, hat and gloves, plus a compact umbrella or rain jacket. See the full December packing list for Boise for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.