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
As November transitions to December, the average high-temperature in Roy falls from a chilly 45.5°F (7.5°C) to an icy 34°F (1.1°C). Roy reports an average nighttime low-temperature of 23.4°F (-4.8°C) in December.Humidity
The average relative humidity in December in Roy is 77%.Rainfall
In December, in Roy, Utah, the rain falls for 5.5 days. Throughout December, 1.02" (26mm) of precipitation is accumulated. Throughout the year, in Roy, there are 91.6 rainfall days, and 11.06" (281mm) of precipitation is accumulated.Snowfall
Months with snowfall in Roy are January through May, September through December. In Roy, in December, during 8.2 snowfall days, 4.37" (111mm) of snow is typically accumulated. Throughout the year, in Roy, there are 37.8 snowfall days, and 24.76" (629mm) of snow is accumulated.Daylight
The month with the shortest days is December, 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 5:00 pm. On the last day of December, sunrise is at 7:53 am and sunset at 5:09 pm MST.
Sunshine
In December, the average sunshine is 6h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for ordinary individuals.Note: During December, 2 as the daily maximum UV index converts into the following advice:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
Frequently asked questions
How cold is December in Roy?
What is the average humidity in December in Roy?
How much does it rain in Roy in December?
How many days does it snow in December in Roy?
What is the month with the shortest days in Roy?
What is the average length of the day in December in Roy?
What time are sunrise and sunset in December in Roy?
How long on average sun shines in December in Roy?
What is the month with the lowest UV index in Roy?
What is the UV index reading in December in Roy?
Average temperature in December
Roy, UT
- Average high temperature in December: 34°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (33.4°F).
- Average low temperature in December: 23.4°F
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in December
Roy, UT
- Average pressure in December: 30.23"Hg
The month with the highest atmospheric pressure is January (30.29"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in December
Roy, UT
- Average wind speed in December: 5.5mph
The windiest month (with the highest average wind speed) is April (6.5mph).
The calmest month (with the lowest average wind speed) is January (4.8mph).
Average humidity in December
Roy, UT
- Average humidity in December: 77%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is July (37%).
Average rainfall in December
Roy, UT
- Average rainfall in December: 1.02"
The wettest month (with the highest rainfall) is April (1.26").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in December
Roy, UT
- Average rainfall days in December: 5.5 days
The month with the highest number of rainy days is May (12.5 days).
The month with the least rainy days is January (4.6 days).
Average snowfall in December
Roy, UT
- Average snowfall in December: 4.37"
The month with the highest snowfall is January (6.89").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Roy, UT
- Average snowfall days in December: 8.2 days
The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Roy, UT
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 6h and 0min
The months with the most sunshine are June, July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 5h and 36min).
Average sunshine days in December
Roy, UT
- Average sunshine days in December: 19.9 days
The months with the most sunshine days are October and November (21.6 days).
The month with the least sunshine days is April (14.7 days).
Average UV index in December
Roy, UT
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Roy, UT
- Average cloud cover in December: 37
The months with the most cloud cover are January and February (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 10).
Average visibility in December
Roy, 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).
Roy, Utah, USA
Weather forecast for your location
2. Allow the app to use your location