December weather forecastSummit, UT
December
Weather in December
December, the first month of the winter in Summit, is also a wintry month, with an average temperature fluctuating between 35.4°F (1.9°C) and 18.9°F (-7.3°C).Temperature
The months of January and December bring the lowest temperatures, averaging a high of 35.4°F (1.9°C).Humidity
In December, the average relative humidity is 73%.Rainfall
In Summit, during December, the rain falls for 6 days and regularly aggregates up to 1.22" (31mm) of precipitation. In Summit, Utah, during the entire year, the rain falls for 78.4 days and collects up to 11.61" (295mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. December is the month with the most snowfall. Snow falls for 9.8 days and accumulates 8.19" (208mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 36min of daylight.On the first day of the month, sunrise is at 7:29 am and sunset at 5:13 pm. On the last day of December, sunrise is at 7:47 am and sunset at 5:23 pm MST.
Sunshine
December has the least sunshine of the year, with an average of 6.4h of sunshine.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for average individuals.Note: The UV index of 2 during December translates into the following guidance:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Summit, UT
- Average high temperature in December: 35.4°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The months with the lowest average high temperature are January and December (35.4°F).
- Average low temperature in December: 18.9°F
The month with the highest average low temperature is July (59°F).
The coldest month (with the lowest average low temperature) is December (18.9°F).
Average pressure in December
Summit, UT
- Average pressure in December: 30.16"Hg
The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in December
Summit, UT
- Average wind speed in December: 5.8mph
The windiest month (with the highest average wind speed) is June (8.1mph).
The calmest month (with the lowest average wind speed) is January (5.4mph).
Average humidity in December
Summit, UT
- Average humidity in December: 73%
The month with the highest relative humidity is January (76%).
The month with the lowest relative humidity is June (27%).
Average rainfall in December
Summit, UT
- Average rainfall in December: 1.22"
The wettest month (with the highest rainfall) is July (1.34").
The driest month (with the least rainfall) is June (0.2").
Average rainfall days in December
Summit, UT
- Average rainfall days in December: 6 days
The month with the highest number of rainy days is July (11.9 days).
The month with the least rainy days is June (2.7 days).
Average snowfall in December
Summit, UT
- Average snowfall in December: 8.19"
The month with the highest snowfall is December (8.19").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Summit, UT
- Average snowfall days in December: 9.8 days
The month with the highest number of snowfall days is December (9.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Summit, UT
- Average daylight in December: 9h and 36min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 6h and 24min
The months with the most sunshine are June and August (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).
Average sunshine days in December
Summit, UT
- Average sunshine days in December: 18.5 days
The month with the most sunshine days is June (25.8 days).
The month with the least sunshine days is July (16 days).
Average UV index in December
Summit, UT
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Summit, UT
- Average cloud cover in December: 31
The month with the most cloud cover is December (Cloud cover 31).
The month with the least cloud cover is June (Cloud cover 9).
Average visibility in December
Summit, UT
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
