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
December is the coldest month in Boulder, with an average high-temperature of 23.9°F (-4.5°C) and an average low-temperature of 5.9°F (-14.5°C).Humidity
The average relative humidity in December in Boulder, Wyoming, is 83%.Rainfall
In Boulder, Wyoming, in December, it is raining for 7.2 days, with typically 0.55" (14mm) of accumulated precipitation. In Boulder, Wyoming, during the entire year, the rain falls for 102.6 days and collects up to 10.75" (273mm) of precipitation.Snowfall
Months with snowfall are January through June, September through December. In Boulder, during December, snow falls for 13.5 days and regularly aggregates up to 4.33" (110mm) of snow. Throughout the year, in Boulder, there are 86.8 snowfall days, and 41.77" (1061mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:30 am and sunset at 4:46 pm. On the last day of December, sunrise is at 7:49 am and sunset at 4:55 pm MST.
Sunshine
In Boulder, Wyoming, the average sunshine in December is 6.5h.UV index
The months with the lowest UV index are January through April, October through December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum daily UV index, 2 in December, converts into the following recommendations:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month in Boulder?
How cold is December in Boulder?
What is the average humidity in December in Boulder?
How much does it rain in Boulder in December?
How much does it snow in Boulder in December?
What is the month with the shortest days in Boulder?
How many hours of daylight does Boulder have in December?
What time are sunrise and sunset in December in Boulder?
How long on average sun shines in December in Boulder?
What is the month with the lowest UV index in Boulder?
What is the UV index reading in December in Boulder?
Average temperature in December
Boulder, WY
- Average high temperature in December: 23.9°F
The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is December (23.9°F).
- Average low temperature in December: 5.9°F
The month with the highest average low temperature is July (55.2°F).
The coldest month (with the lowest average low temperature) is January (5.4°F).
Average pressure in December
Boulder, WY
- Average pressure in December: 30.24"Hg
The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Boulder, WY
- 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 December (5.8mph).
Average humidity in December
Boulder, WY
- Average humidity in December: 83%
The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is August (34%).
Average rainfall in December
Boulder, WY
- Average rainfall in December: 0.55"
The wettest month (with the highest rainfall) is May (1.73").
The driest month (with the least rainfall) is August (0.51").
Average rainfall days in December
Boulder, WY
- Average rainfall days in December: 7.2 days
The month with the highest number of rainy days is May (15.2 days).
The month with the least rainy days is January (5.5 days).
Average snowfall in December
Boulder, WY
- Average snowfall in December: 4.33"
The month with the highest snowfall is February (7.32").
The months with the least snowfall are July and August (0").
Average snowfall days in December
Boulder, WY
- Average snowfall days in December: 13.5 days
The month with the highest number of snowfall days is March (15.7 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Boulder, WY
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 6h and 3min
The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 6h and 18min).
Average sunshine days in December
Boulder, WY
- Average sunshine days in December: 16.7 days
The month with the most sunshine days is January (19.8 days).
The month with the least sunshine days is May (9.7 days).
Average UV index in December
Boulder, WY
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in December
Boulder, WY
- Average cloud cover in December: 34
The month with the most cloud cover is February (Cloud cover 39).
The month with the least cloud cover is August (Cloud cover 11).
Average visibility in December
Boulder, WY
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and February (4mi).
Boulder, Wyoming, USA
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