Boise

Idaho Weather in December

Average temperatures, rainfall, sunshine and the best places to visit in Idaho, the United States of America in December.

Planning a getaway to Idaho, the United States of America this December and curious about the weather you should prepare for? Discover all the vital details you need on this page, solving your puzzle:

What to Expect in Idaho in December

Idaho, the United States of America is a region in the United States of America. December in Idaho generally has temperatures that range from very cold to cold, with precipitation levels ranging from low to high. December falls during the winter season.

Temperatures

During the day the temperature is very cold in Stanley at -2°C (28°F) and cold in Lewiston at 5°C (41°F). As night falls, temperatures generally drop to -1°C (30°F) in Lewiston and -15°C (5°F) in Stanley. December is a very cold month in some areas, so be prepared and make sure to dress up warm.

To explore the conditions in Idaho, the United States of America in more detail, check the map below.

Precipitation

In December, precipitation varies across different areas. From low snowfall in Salmon with an average of 16 mm (0.6 in) to high snowfall in Wallace with 150 mm (5.9 in). Based on climate data from the last 30 years, Boise receives the most rainfall during this month of the year.

Average sunshine

Sunshine levels are moderate in most locations. Boise typically sees 103 hours of sunlight, creating comfortable conditions that aren't too bright or too dim. Looking for something sunnier? Our weather planner helps you discover destinations with more reliable sunshine.

Explore Idaho by month

Pick a month to see the average temperature, rainfall and sunshine in Idaho — and find the best time to visit. (based on Boise)

Best Places to Visit in Idaho in December

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Idaho.

perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Idaho

What is the weather like in December for some of the most popular destinations in Idaho, the United States of America?

Temperature range in Idaho (December)

Precipitation variation in Idaho (December)

Boise

In December Boise generally has low temperatures with maximum daytime temperatures around 4°C (39°F), minimum nighttime temperatures around -5°C (23°F) and moderate monthly snow/rainfall. So on average the conditions are poor that month.

November
December
January
Max temperature
10°C (50°F)
4°C (39°F)
4°C (39°F)
Min temperature
-1°C (30°F)
-5°C (23°F)
-5°C (23°F)
Monthly sun hours
117 hours
103 hours
111 hours
Monthly snow/rainfall
34 mm (1.3 in)
49 mm (1.9 in)
34 mm (1.3 in)
Monthly rainy days
11 days
14 days
11 days
Weather conditions

Coeur d'Alene

In December Coeur d'Alene generally has very low temperatures with maximum daytime temperatures around 2°C (36°F), minimum nighttime temperatures around -4°C (25°F) and moderate monthly snow/rainfall. So on average the conditions are poor that month.

November
December
January
Max temperature
7°C (45°F)
2°C (36°F)
3°C (37°F)
Min temperature
-1°C (30°F)
-4°C (25°F)
-4°C (25°F)
Monthly sun hours
73 hours
60 hours
78 hours
Monthly snow/rainfall
93 mm (3.7 in)
98 mm (3.9 in)
88 mm (3.5 in)
Monthly rainy days
17 days
17 days
16 days
Weather conditions

Idaho Falls

In December Idaho Falls generally has very low temperatures with maximum daytime temperatures around 0°C (32°F), minimum nighttime temperatures around -10°C (14°F) and low monthly snowfall. So on average the conditions are poor that month.

November
December
January
Max temperature
7°C (45°F)
0°C (32°F)
-2°C (28°F)
Min temperature
-5°C (23°F)
-10°C (14°F)
-11°C (12°F)
Monthly snowfall
22 mm (0.9 in)
24 mm (0.9 in)
22 mm (0.9 in)
Monthly rainy days
7 days
10 days
9 days
Weather conditions

Ketchum

In December Ketchum generally has very low temperatures with maximum daytime temperatures around 0°C (32°F), minimum nighttime temperatures around -11°C (12°F) and moderate monthly snowfall. So on average the conditions are poor that month.

November
December
January
Max temperature
6°C (43°F)
0°C (32°F)
1°C (34°F)
Min temperature
-7°C (19°F)
-11°C (12°F)
-12°C (10°F)
Monthly snowfall
45 mm (1.8 in)
83 mm (3.3 in)
50 mm (2 in)
Monthly rainy days
13 days
15 days
12 days
Weather conditions

Pocatello

In December Pocatello generally has very low temperatures with maximum daytime temperatures around 2°C (36°F), minimum nighttime temperatures around -7°C (19°F) and moderate monthly snow/rainfall. So on average the conditions are poor that month.

November
December
January
Max temperature
8°C (46°F)
2°C (36°F)
1°C (34°F)
Min temperature
-3°C (27°F)
-7°C (19°F)
-8°C (18°F)
Monthly snow/rainfall
28 mm (1.1 in)
32 mm (1.3 in)
28 mm (1.1 in)
Monthly rainy days
8 days
13 days
11 days
Weather conditions

Is your destination not in the list? Have a look at all destinations in Idaho, in the United States of America.

Popular cities in December

Day & night temperatures, rainfall and average weather in Idaho in December.

City Weather Day temp Night temp Rainfall
Boise 4°C (39°F) -5°C (23°F) 49 mm (1.9 in)
Coeur d'Alene 2°C (36°F) -4°C (25°F) 98 mm (3.9 in)
Idaho Falls 0°C (32°F) -10°C (14°F) 24 mm (0.9 in)
Ketchum 0°C (32°F) -11°C (12°F) 83 mm (3.3 in)
Pocatello 2°C (36°F) -7°C (19°F) 32 mm (1.3 in)
Island Park -2°C (28°F) -14°C (7°F) 104 mm (4.1 in)

Idaho weather in December: frequently asked questions

What is the weather like in Idaho, the United States of America in December?

Expect poor weather across Idaho, the United States of America in December. The popular destination of Boise averages 4°C (39°F) by day and -5°C (23°F) at night during this winter month.

What is the average temperature in Idaho, the United States of America in December?

In Boise, the average daytime high in December is 4°C (39°F), while nighttime temperatures drop to around -5°C (23°F).

Does Idaho, the United States of America get a lot of snow/rain in December?

December is on the drier side in Idaho, the United States of America. Boise averages only about 49 mm (1.9 in), with most days staying dry.

Is December a Good Time to Visit Idaho, the United States of America?

In our opinion, December may not be the ideal time to visit Idaho, the United States of America due to the typically poor weather in Boise.

On average, the best time to visit Idaho, the United States of America is in May, June, September and October with generally perfect weather in Boise. In contrast, January, July, November and December tend to have poor weather conditions.

Interested in more climate information?

We have much more information about the climate in Idaho.

Weather and climate has detailed information for every country in the world. Are you going to the United States of America? Get detailed historical weather averages for many cities in the United States of America.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

Bucket list

Need travel inspiration? Check out our bucket list articles and be inspired.