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
Union in December demonstrates a small temperature transition, adjusting from an average high of a frosty 45°F (7.2°C) in November to a wintry 32.9°F (0.5°C). Union witnesses a consistent average low-temperature of 19°F (-7.2°C) throughout December.Humidity
In Union, the average relative humidity in December is 80%.Rainfall
In December, the rain falls for 10 days. Throughout December, 1.85" (47mm) of precipitation is accumulated. Throughout the year, there are 110.7 rainfall days, and 16.06" (408mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Union, in December, snow falls for 11.3 days, with typically accumulated 8.62" (219mm) of snow. In Union, during the entire year, snow falls for 51.1 days and aggregates up to 41.54" (1055mm) of snow.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:32 am and sunset at 5:01 pm. On the last day of December, sunrise is at 7:51 am and sunset at 5:10 pm MST.
Sunshine
In December, the average sunshine is 5.8h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for the average person.Note: The UV index of 1 in December translates into these instructions:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Always opt for UVA and UVB-resistant sunglasses on radiant days. 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
How cold is it in December?
What is the average humidity in December?
How many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
What time are sunrise and sunset in December?
How long on average sun shines in December?
When is the lowest UV index in Union?
What is the UV index intensity in December?
Average temperature in December
Union, UT
- Average high temperature in December: 32.9°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (32.5°F).
- Average low temperature in December: 19°F
The month with the highest average low temperature is July (60.3°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).
Average pressure in December
Union, UT
- Average pressure in December: 30.22"Hg
The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in December
Union, UT
- Average wind speed in December: 5.4mph
The windiest months (with the highest average wind speed) are March and April (6.3mph).
The calmest month (with the lowest average wind speed) is January (4.8mph).
Average humidity in December
Union, UT
- Average humidity in December: 80%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is July (37%).
Average rainfall in December
Union, UT
- Average rainfall in December: 1.85"
The wettest month (with the highest rainfall) is March (1.97").
The driest month (with the least rainfall) is June (0.59").
Average rainfall days in December
Union, UT
- Average rainfall days in December: 10 days
The month with the highest number of rainy days is March (13.2 days).
The month with the least rainy days is June (6.3 days).
Average snowfall in December
Union, UT
- Average snowfall in December: 8.62"
The month with the highest snowfall is January (10.71").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Union, UT
- Average snowfall days in December: 11.3 days
The month with the highest number of snowfall days is January (12.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Union, 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 5min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).
Average sunshine days in December
Union, UT
- Average sunshine days in December: 16.1 days
The month with the most sunshine days is June (21.4 days).
The month with the least sunshine days is February (12.9 days).
Average UV index in December
Union, 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
Union, UT
- Average cloud cover in December: 39
The month with the most cloud cover is February (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 10).
Average visibility in December
Union, 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).
Union, Utah, USA
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