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
A shift in Grantsville's weather is observed as November turns into December, with the average high temperature reducing from a chilly 45.9°F (7.7°C) to an icy 33.8°F (1°C). Grantsville observes an average nighttime low-temperature of 22.1°F (-5.5°C) during the month of December.Humidity
In December, the average relative humidity in Grantsville is 78%.Rainfall
In Grantsville, during December, the rain falls for 10.6 days and regularly aggregates up to 1.93" (49mm) of precipitation. In Grantsville, during the entire year, the rain falls for 137.7 days and collects up to 20.98" (533mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. The month with the most snowfall is December, when snow falls for 12.5 days and typically aggregates up to 9.69" (246mm) 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 the month, sunrise is at 7:34 am and sunset at 5:03 pm. On the last day of December, sunrise is at 7:53 am and sunset at 5:13 pm MST.
Sunshine
In Grantsville, the average sunshine in December is 5.4h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: A daily high UV index of 1 in December leads to these guidelines:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Frequently asked questions
How cold is it in Grantsville in December?
What is the average humidity in December in Grantsville?
How many days does it rain in December in Grantsville?
What is the snowiest month in Grantsville?
How many days does it snow in December in Grantsville?
What is the month with the shortest days in Grantsville?
What is the average length of the day in December in Grantsville?
When is the sunrise / sunset in December in Grantsville?
How many hours of sunshine does Grantsville have in December?
When is the lowest UV index in Grantsville?
How high is the UV index in December in Grantsville?
Average temperature in December
Grantsville, UT
- Average high temperature in December: 33.8°F
The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (33.4°F).
- Average low temperature in December: 22.1°F
The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).
Average pressure in December
Grantsville, 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
Grantsville, UT
- Average wind speed in December: 7.1mph
The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is January (6mph).
Average humidity in December
Grantsville, UT
- Average humidity in December: 78%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is July (36%).
Average rainfall in December
Grantsville, UT
- Average rainfall in December: 1.93"
The wettest month (with the highest rainfall) is April (2.52").
The driest month (with the least rainfall) is June (1.1").
Average rainfall days in December
Grantsville, UT
- Average rainfall days in December: 10.6 days
The month with the highest number of rainy days is April (16.3 days).
The month with the least rainy days is November (7.5 days).
Average snowfall in December
Grantsville, UT
- Average snowfall in December: 9.69"
The month with the highest snowfall is December (9.69").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Grantsville, UT
- Average snowfall days in December: 12.5 days
The month with the highest number of snowfall days is December (12.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Grantsville, 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 2min
The month with the most sunshine is August (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).
Average sunshine days in December
Grantsville, UT
- Average sunshine days in December: 13.1 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is February (10.2 days).
Average UV index in December
Grantsville, UT
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Grantsville, UT
- Average cloud cover in December: 43
The month with the most cloud cover is January (Cloud cover 45).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in December
Grantsville, UT
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
Grantsville, Utah, USA
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