January weather forecast
Boise, ID

The golden fall season in Boise, Idaho
The golden fall season in Boise, Idaho

Weather in January

January, the same as December, is another cold winter month in Boise, Idaho, with an average temperature varying between 23.4°F (-4.8°C) and 35.2°F (1.8°C).

Temperature

In January, the average high-temperature is practically the same as in December - a still wintry 35.2°F (1.8°C). In Boise, Idaho, the average low-temperature is 23.4°F (-4.8°C).

Humidity

With an average relative humidity of 80%, January is the most humid month.

Rainfall

In January, the rain falls for 10.5 days. Throughout January, 2.05" (52mm) of precipitation is accumulated. Throughout the year, in Boise, there are 116.8 rainfall days, and 15.08" (383mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Boise, Idaho, are January through April, November and December. In January, in Boise, Idaho, it is snowing for 8.2 days. Throughout January, 6.54" (166mm) of snow is accumulated. In Boise, during the entire year, snow falls for 31.4 days and aggregates up to 21.3" (541mm) of snow.

Daylight

In January, the average length of the day in Boise is 9h and 23min.
On the first day of January, sunrise is at 8:18 am and sunset at 5:18 pm. On the last day of the month, sunrise is at 8:01 am and sunset at 5:54 pm MST.

Sunshine

In January, the average sunshine in Boise is 5.7h.

UV index

The months with the lowest UV index in Boise are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 2 in January interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
[Resources]

FAQ

What is the most humid month in Boise?

January is the most humid month in Boise, with an average relative humidity of 80%.

What is the average humidity in January in Boise?

In January, the average relative humidity in Boise, Idaho, is 80%.

How much does it rain in Boise in January?

In January, in Boise, Idaho, the rain falls for 10.5 days. Throughout January, 2.05" (52mm) of precipitation is accumulated.

How much does it snow in Boise in January?

In January, in Boise, it is snowing for 8.2 days. Throughout January, 6.54" (166mm) of snow is accumulated.

How many hours of daylight does Boise have in January?

In January, the average day length in Boise, Idaho, is 9h and 23min.

When is the sunrise / sunset in January in Boise?

In January, on the first day of the month, sunrise is at 8:18 am and sunset at 5:18 pm. On the last day of the month, in Boise, Idaho, sunrise is at 8:01 am and sunset at 5:54 pm MST.

How many hours of sunshine does Boise have in January?

In Boise, the average sunshine duration in January is 5.7h.

What are the months with the lowest UV index in Boise?

The months with the lowest UV index in Boise, Idaho, are January, February, November and December, with an average maximum UV index of 2.

How high is the UV index in January in Boise?

The average daily maximum UV index in January in Boise, Idaho, is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Boise, ID

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).

[Resources]

Average pressure in January
Boise, ID

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).

[Resources]

Average wind speed in January
Boise, ID

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).

[Resources]

Average humidity in January
Boise, ID

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%).

[Resources]

Average rainfall in January
Boise, ID

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").

[Resources]

Average rainfall days in January
Boise, ID

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).

[Resources]

Average snowfall in January
Boise, ID

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").

[Resources]

Average snowfall days in January
Boise, ID

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).

[Resources]

Average daylight in January /
Average sunshine in January
Boise, ID

Average daylight in January / Average sunshine in January - Boise, ID
  • Average daylight in January: 9h and 23min

The month with the longest days is June (Average daylight: 15h and 23min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in January: 5h and 42min

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).

[Resources]

Average sunshine days in January
Boise, ID

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).

[Resources]

Average UV index in January
Boise, ID

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).

[Resources]

Average cloud cover in January
Boise, ID

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).

[Resources]

Average visibility in January
Boise, ID

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).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location