Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
Boise's coldest weather arrives in December, when temperatures average a high of 34.7°F and a low of 23.2°F.Humidity
In December, the average relative humidity is 78%.Rainfall
In Boise, Idaho, in December, it is raining for 10.4 days, with typically 2.09" of accumulated precipitation. Throughout the year, there are 116.8 rainfall days, and 15.08" of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall in Boise. The month with the most snowfall is December, when snow falls for 9.2 days and typically aggregates up to 6.65" of snow.Daylight
December has the shortest days of the year, with an average of 9h and 0min of daylight.On the first day of the month, sunrise is at 7:58 am and sunset at 5:09 pm. On the last day of December, in Boise, sunrise is at 8:18 am and sunset at 5:17 pm MST.
Sunshine
The month with the least sunshine is December, with an average of 5.5h of sunshine.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Boise. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.Note: In December, the maximum UV index of 2 translates into these guidelines:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. It's recommended to limit sun exposure when its radiation is at its peak during midday. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Frequently asked questions
What is the coldest month in Boise?
How cold is December in Boise?
What is the average humidity in December in Boise?
How much does it rain in Boise in December?
What is the snowiest month in Boise?
How much does it snow in Boise in December?
What is the month with the shortest days in Boise?
What is the average length of the day in December in Boise?
When are sunrise and sunset in December in Boise?
What is the month with the least sunshine in Boise?
How many hours of sunshine does Boise have in December?
What is the month with the lowest UV index in Boise?
What is the UV index intensity in December in Boise?
Average temperature in December
Boise, ID
- Average high temperature in December: 34.7°F
The warmest month (with the highest average high temperature) is July (87.8°F).
The month with the lowest average high temperature is December (34.7°F).
- Average low temperature in December: 23.2°F
The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is December (23.2°F).
Average pressure in December
Boise, ID
- Average pressure in December: 30.22"Hg
The month with the highest atmospheric pressure is January (30.25"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Boise, ID
- Average wind speed in December: 5.8mph
The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is January (5.2mph).
Average humidity in December
Boise, ID
- Average humidity in December: 78%
The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is July (30%).
Average rainfall in December
Boise, ID
- Average rainfall in December: 2.09"
The wettest month (with the highest rainfall) is March (2.2").
The driest month (with the least rainfall) is July (0.2").
Average rainfall days in December
Boise, ID
- Average rainfall days in December: 10.4 days
The month with the highest number of rainy days is March (16.2 days).
The month with the least rainy days is July (4.5 days).
Average snowfall in December
Boise, ID
- Average snowfall in December: 6.65"
The month with the highest snowfall is December (6.65").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Boise, ID
- Average snowfall days in December: 9.2 days
The month with the highest number of snowfall days is December (9.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Boise, ID
- Average daylight in December: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in December: 5h and 3min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in December
Boise, ID
- Average sunshine days in December: 15.2 days
The month with the most sunshine days is July (23.6 days).
The month with the least sunshine days is March (12.1 days).
Average UV index in December
Boise, ID
- Average UV index in December: 2
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Boise, ID
- Average cloud cover in December: 42
The month with the most cloud cover is December (Cloud cover 42).
The month with the least cloud cover is July (Cloud cover 8).
Average visibility in December
Boise, ID
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Boise, Idaho, USA
Weather forecast for your location
2. Allow the app to use your location
