December weather forecastAmerican Falls, ID
December
Weather in December
Wrapping up the year, December brings American Falls back to solid winter footing with temperatures dropping to a chilly 18°F (-7.8°C). The increase in snowfall to its annual high of 5.28" (134mm) paints a picture of a white Christmas. Short daylight hours and extended nights characterize the winter solstice period. With decreasing sunlight hours, the UV index falls to an annual low of 1. Atmospheric pressure experiences an uptick to 30.26 in, ensuring a festive and frosty end to the year in the town.Temperature
December, with its average high-temperature of 29.3°F (-1.5°C) and an average low-temperature of 18°F (-7.8°C), holds the record as the coldest month in American Falls.Humidity
In December, the average relative humidity is 84%.Rainfall
In American Falls, during December, the rain falls for 8.5 days and regularly aggregates up to 0.91" (23mm) of precipitation. In American Falls, during the entire year, the rain falls for 108.7 days and collects up to 10.47" (266mm) of precipitation.Snowfall
January through May, September through December are months with snowfall in American Falls, Idaho. In American Falls, in December, snow falls for 13.7 days, with typically accumulated 5.28" (134mm) of snow. Throughout the year, in American Falls, there are 57.1 snowfall days, and 25.2" (640mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:43 am and sunset at 4:58 pm. On the last day of December, sunrise is at 8:01 am and sunset at 5:07 pm MST.
Sunshine
In December, the average sunshine is 5.2h.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 minimal health hazard from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 1 in December translates into these instructions:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
American Falls, ID
- Average high temperature in December: 29.3°F
The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is December (29.3°F).
- Average low temperature in December: 18°F
The month with the highest average low temperature is August (58.5°F).
The coldest months (with the lowest average low temperature) are January and December (18°F).
Average pressure in December
American Falls, ID
- Average pressure in December: 30.26"Hg
The month with the highest atmospheric pressure is January (30.3"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
American Falls, ID
- Average wind speed in December: 7mph
The windiest month (with the highest average wind speed) is April (9.6mph).
The calmest months (with the lowest average wind speed) are January and December (7mph).
Average humidity in December
American Falls, ID
- Average humidity in December: 84%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is August (32%).
Average rainfall in December
American Falls, ID
- Average rainfall in December: 0.91"
The wettest month (with the highest rainfall) is March (1.18").
The driest month (with the least rainfall) is July (0.59").
Average rainfall days in December
American Falls, ID
- Average rainfall days in December: 8.5 days
The month with the highest number of rainy days is March (12.5 days).
The month with the least rainy days is January (6.4 days).
Average snowfall in December
American Falls, ID
- Average snowfall in December: 5.28"
The month with the highest snowfall is January (7.2").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
American Falls, ID
- Average snowfall days in December: 13.7 days
The month with the highest number of snowfall days is December (13.7 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
American Falls, ID
- Average daylight in December: 9h and 6min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 5h and 12min
The months with the most sunshine are June and July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).
Average sunshine days in December
American Falls, ID
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is October (20.3 days).
The month with the least sunshine days is February (12.4 days).
Average UV index in December
American Falls, ID
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
American Falls, ID
- Average cloud cover in December: 47
The months with the most cloud cover are February and December (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility in December
American Falls, ID
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
