December weather forecast
American Fork, UT

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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. Snowfall intensifies, recording 10.16", 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

January and December mark American Fork's lowest temperatures, averaging a high-temperature of 32.4°F.

Humidity

In American Fork, Utah, the average relative humidity in December is 81%.

Rainfall

The months with the most rainfall are April and December, with an average 1.93" of precipitation.

Snowfall

Months with snowfall in American Fork are January through May, October through December. In December, it is snowing for 13 days. Throughout December, 10.16" of snow is accumulated. In American Fork, Utah, during the entire year, snow falls for 58.5 days and aggregates up to 44.49" of snow.

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 7:30 am and sunset at 5:01 pm. On the last day of the month, sunrise is at 7:49 am and sunset at 5:10 pm MST.

Sunshine

The average sunshine in December is 5.7h.

UV index

With an average maximum UV index of 1, December is the month with the lowest UV index in American Fork, Utah. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: A maximum UV index of 1 in December translates into the following recommendations:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. To protect against the Sun's most potent rays, avoid direct exposure around midday. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
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Frequently asked questions

What is the coldest time of year in American Fork?

The coldest period falls in January and December, when the average high-temperature reaches 32.4°F.

How cold is December in American Fork?

In American Fork, in December, the average high-temperature is 32.4°F, and the average low-temperature is 17.2°F.

What is the average humidity in December in American Fork?

In December, the average relative humidity in American Fork, Utah, is 81%.

What is the rainiest month in American Fork?

The wettest months in American Fork are April and December, with an average 1.93" of rainfall.

How much does it rain in American Fork in December?

In December, the rain falls for 10.2 days. Throughout December, 1.93" of precipitation is accumulated.

How many days does it snow in December in American Fork?

In American Fork, Utah, in December, snow falls for 13 days, with typically accumulated 10.16" of snow.

What is the month with the shortest days in American Fork?

December has the shortest days of the year in American Fork, Utah, with an average of 9h and 18min of daylight.

What is the average length of the day in December in American Fork?

In December, the average day length is 9h and 21min.

What time are sunrise and sunset in December in American Fork?

In December, on the first day of the month, sunrise is at 7:30 am and sunset at 5:01 pm. On the last day of the month, in American Fork, sunrise is at 7:49 am and sunset at 5:10 pm MST.

How long on average sun shines in December in American Fork?

In American Fork, the average sunshine duration in December is 5.7h.

What is the month with the lowest UV index in American Fork?

With an average maximum UV index of 1, December is the month with the lowest UV index in American Fork, Utah.

What is the UV index reading in December in American Fork?

In December, the average daily maximum UV index in American Fork, Utah, is 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJFMAMJJASONDecember
Nov
December
Jan
Average high temperature
44.6°F
32.4°F
32.4°F
Average low temperature
27.5°F
17.2°F
15.8°F
Average pressure
30.12"Hg
30.21"Hg
30.27"Hg
Average wind speed
5.5mph
5.2mph
4.6mph
Average max. wind speed
5.9mph
5.5mph
5mph
Average wind speed gusts
9.5mph
9mph
8.2mph
Average humidity
65%
81%
86%
Average rainfall
1.22"
1.93"
1.85"
Average rainfall days
7.3
10.2
7.8
Average snowfall
4.69"
10.16"
11.06"
Average snowfall days
6.2
13
12.7
Average daylight
9h 5min
9h 2min
9h 4min
Average sunshine
6h 4min
5h 4min
5h 2min
Average sunshine days
18.5
13.9
15.7
Average UV index
2
1
2
Average cloud cover
26%
40%
41%
Average visibility
6mi
5mi
4mi

Average temperature in December
American Fork, UT

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).

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Average pressure in December
American Fork, UT

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).

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Average wind speed in December
American Fork, UT

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).

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Average humidity in December
American Fork, UT

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%).

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Average rainfall in December
American Fork, UT

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").

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Average rainfall days in December
American Fork, UT

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).

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Average snowfall in December
American Fork, UT

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").

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Average snowfall days in December
American Fork, UT

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).

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Average daylight in December /
Average sunshine in December
American Fork, UT

Average daylight in December / Average sunshine in December - American Fork, UT
  • Average daylight in December: 9h and 2min

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 4min

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).

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Average sunshine days in December
American Fork, UT

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).

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Average UV index in December
American Fork, UT

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).

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Average cloud cover in December
American Fork, UT

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).

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Average visibility in December
American Fork, UT

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).

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American Fork, Utah, USA

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