Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
January brings an average high-temperature of a still wintry 35.2°F (1.8°C), showing a slight difference from December's 34.7°F (1.5°C). During the nights in January, Boise experiences a consistent average temperature of 23.4°F (-4.8°C).Humidity
With an average relative humidity of 80%, January is the most humid month.Rainfall
In Boise, in January, during 10.5 rainfall days, 2.05" (52mm) of precipitation is typically accumulated. In Boise, during the entire year, the rain falls for 116.8 days and collects up to 15.08" (383mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Boise, in January, during 8.2 snowfall days, 6.54" (166mm) of snow is typically accumulated. Throughout the year, there are 31.4 snowfall days, and 21.3" (541mm) of snow is accumulated.Daylight
In Boise, the average length of the day in January is 9h and 23min.On the first day of the month, sunrise is at 8:18 am and sunset at 5:18 pm. On the last day of January, sunrise is at 8:02 am and sunset at 5:54 pm MST.
Sunshine
In January, the average sunshine is 5.7h.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 value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for average individuals.Note: In January, a daily UV index of 2 turns into the following recommendations:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Enhance your sun protection with tightly woven, yet airy clothing. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is January?
What is the most humid month?
What is the average humidity in January?
How many days does it rain in January?
How much does it snow in January?
How many hours of daylight does Boise have in January?
What time are sunrise and sunset in January?
How many hours of sunshine does Boise have in January?
What are the months with the lowest UV index?
How high is the UV index in January?
Average temperature in January
Boise, ID
- Average high temperature in January: 35.2°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 January: 23.4°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 January
Boise, ID
- Average pressure in January: 30.25"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 January
Boise, ID
- Average wind speed in January: 5.2mph
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 January
Boise, ID
- Average humidity in January: 80%
The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is July (30%).
Average rainfall in January
Boise, ID
- Average rainfall in January: 2.05"
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 January
Boise, ID
- Average rainfall days in January: 10.5 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 January
Boise, ID
- Average snowfall in January: 6.54"
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 January
Boise, ID
- Average snowfall days in January: 8.2 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 January /
Average sunshine in January
Boise, ID
- Average daylight in January: 9h and 2min
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 January: 5h and 4min
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 January
Boise, ID
- Average sunshine days in January: 15.8 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 January
Boise, ID
- Average UV index in January: 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 January
Boise, ID
- Average cloud cover in January: 40
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 January
Boise, ID
- Average visibility in January: 5mi
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
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