December weather forecastAmerican Fork, UT
December
Weather in December
December in American Fork signals the beginning of winter, with a significant drop in temperature from November, visible by the average low dipping to 17.2°F (-8.2°C). Snowfall intensifies, recording 10.16" (258mm), closely matching the amount seen at the beginning of the year. The shortage of daylight hours and the increased frequency of snow showers make the city resemble a winter wonderland. Despite the dropping temperatures, the holiday spirit brings warmth during this coldest month of the year. The winter chill is usually mitigated by the festive cheer spread across the city, and the crisp weather forms the perfect backdrop for seasonal celebrations.Temperature
The temperature hits its lowest levels in January and December, recording an average high-temperature of 32.4°F (0.2°C).Humidity
The average relative humidity in December in American Fork is 81%.Rainfall
The wettest months are April and December, with an average 1.93" (49mm) of rainfall.Snowfall
January through May, October through December are months with snowfall. In American Fork, during December, snow falls for 13 days and regularly aggregates up to 10.16" (258mm) of snow. Throughout the year, there are 58.5 snowfall days, and 44.49" (1130mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 18min of daylight.On the first day of December, sunrise is at 7:31 am and sunset at 5:01 pm. On the last day of the month, sunrise is at 7:50 am and sunset at 5:11 pm MST.
Sunshine
In American Fork, the average sunshine in December is 5.7h.UV index
December is the month with the lowest UV index in American Fork, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for the average person.Note: In December, the maximum UV index of 1 suggests these recommendations:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
American Fork, UT
- Average high temperature in December: 32.4°F
The warmest month (with the highest average high temperature) is July (85.3°F).
The months with the lowest average high temperature are January and December (32.4°F).
- Average low temperature in December: 17.2°F
The month with the highest average low temperature is July (58.1°F).
The coldest month (with the lowest average low temperature) is January (15.8°F).
Average pressure in December
American Fork, UT
- Average pressure in December: 30.21"Hg
The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in December
American Fork, UT
- Average wind speed in December: 5.2mph
The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest month (with the lowest average wind speed) is January (4.6mph).
Average humidity in December
American Fork, UT
- Average humidity in December: 81%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is July (38%).
Average rainfall in December
American Fork, UT
- Average rainfall in December: 1.93"
The wettest months (with the highest rainfall) are April and December (1.93").
The driest month (with the least rainfall) is June (0.75").
Average rainfall days in December
American Fork, UT
- Average rainfall days in December: 10.2 days
The month with the highest number of rainy days is May (14.3 days).
The months with the least rainy days are June and November (7.3 days).
Average snowfall in December
American Fork, UT
- Average snowfall in December: 10.16"
The month with the highest snowfall is January (11.06").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
American Fork, UT
- Average snowfall days in December: 13 days
The month with the highest number of snowfall days is December (13 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
American Fork, UT
- Average daylight in December: 9h and 18min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 5h and 42min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).
Average sunshine days in December
American Fork, UT
- Average sunshine days in December: 13.9 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is February (11.4 days).
Average UV index in December
American Fork, UT
- 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
American Fork, UT
- Average cloud cover in December: 40
The month with the most cloud cover is February (Cloud cover 42).
The month with the least cloud cover is August (Cloud cover 10).
Average visibility in December
American Fork, UT
- 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).
