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
Harrison reaches its lowest average temperatures in December, measuring 28°F (-2.2°C) at the peak and 12.7°F (-10.7°C) at the lowest.Humidity
In December, the average relative humidity is 84%.Rainfall
In Harrison, during December, the rain falls for 9.5 days and regularly aggregates up to 0.67" (17mm) of precipitation. Throughout the year, there are 134.2 rainfall days, and 11.34" (288mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall. In Harrison, Montana, in December, during 14.8 snowfall days, 4.72" (120mm) of snow is typically accumulated. Throughout the year, there are 79.6 snowfall days, and 30.08" (764mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 8h and 48min of daylight.On the first day of the month, sunrise is at 7:48 am and sunset at 4:44 pm. On the last day of December, sunrise is at 8:07 am and sunset at 4:53 pm MST.
Sunshine
In December, the average sunshine is 6.1h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 1 during December translates into the following directions:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year?
How cold is December?
What is the average humidity in December?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Harrison have in December?
When are sunrise and sunset in December?
How many hours of sunshine does Harrison have in December?
What is the month with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Harrison, MT
- Average high temperature in December: 28°F
The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is December (28°F).
- Average low temperature in December: 12.7°F
The month with the highest average low temperature is August (50.5°F).
The coldest month (with the lowest average low temperature) is December (12.7°F).
Average pressure in December
Harrison, MT
- Average pressure in December: 30.19"Hg
The months with the highest atmospheric pressure are January and December (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Harrison, MT
- Average wind speed in December: 4.8mph
The windiest month (with the highest average wind speed) is April (5.5mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).
Average humidity in December
Harrison, MT
- Average humidity in December: 84%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (44%).
Average rainfall in December
Harrison, MT
- Average rainfall in December: 0.67"
The wettest month (with the highest rainfall) is June (1.57").
The driest month (with the least rainfall) is August (0.51").
Average rainfall days in December
Harrison, MT
- Average rainfall days in December: 9.5 days
The month with the highest number of rainy days is April (16.5 days).
The month with the least rainy days is August (7.6 days).
Average snowfall in December
Harrison, MT
- Average snowfall in December: 4.72"
The month with the highest snowfall is February (6.02").
The months with the least snowfall are July and August (0").
Average snowfall days in December
Harrison, MT
- Average snowfall days in December: 14.8 days
The month with the highest number of snowfall days is February (16.5 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Harrison, MT
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 6h and 1min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 5h and 54min).
Average sunshine days in December
Harrison, MT
- Average sunshine days in December: 14.4 days
The month with the most sunshine days is September (18.7 days).
The month with the least sunshine days is April (9.3 days).
Average UV index in December
Harrison, MT
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Harrison, MT
- Average cloud cover in December: 38
The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in December
Harrison, MT
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
Harrison, Montana, USA
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