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
With average temperatures fluctuating between a high of 21.2°F (-6°C) and a low of 0.7°F (-17.4°C), December stands out as the coldest month.Humidity
In December, the average relative humidity is 85%.Rainfall
In Jefferson, in December, it is raining for 4.5 days, with typically 1.34" (34mm) of accumulated precipitation. In Jefferson, Colorado, during the entire year, the rain falls for 110.4 days and collects up to 24.09" (612mm) of precipitation.Snowfall
January through December are months with snowfall in Jefferson. In Jefferson, in December, during 17.6 snowfall days, 10.83" (275mm) of snow is typically accumulated. Throughout the year, there are 158 snowfall days, and 118.82" (3018mm) of snow is accumulated.Daylight
The month with the shortest days in Jefferson is December, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:04 am and sunset at 4:40 pm. On the last day of December, sunrise is at 7:23 am and sunset at 4:50 pm MST.
Sunshine
In Jefferson, Colorado, the average sunshine in December is 5.5h.UV index
The months with the lowest UV index in Jefferson are February and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for the average person.Note: The maximum UV index of 1 during December leads to 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. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
Frequently asked questions
What is the coldest month in Jefferson?
How cold is December in Jefferson?
What is the average humidity in December in Jefferson?
How much does it rain in Jefferson in December?
How much does it snow in Jefferson in December?
What is the month with the shortest days in Jefferson?
What is the average length of the day in December in Jefferson?
When are sunrise and sunset in December in Jefferson?
How long on average sun shines in December in Jefferson?
When is the lowest UV index in Jefferson?
How high is the UV index in December in Jefferson?
Average temperature in December
Jefferson, CO
- Average high temperature in December: 21.2°F
The warmest month (with the highest average high temperature) is July (65.8°F).
The month with the lowest average high temperature is December (21.2°F).
- Average low temperature in December: 0.7°F
The month with the highest average low temperature is July (40.1°F).
The coldest months (with the lowest average low temperature) are January and December (0.7°F).
Average pressure in December
Jefferson, CO
- Average pressure in December: 30.16"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The months with the lowest atmospheric pressure are April and May (29.94"Hg).
Average wind speed in December
Jefferson, CO
- Average wind speed in December: 6.2mph
The windiest month (with the highest average wind speed) is February (7mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Jefferson, CO
- Average humidity in December: 85%
The month with the highest relative humidity is February (89%).
The month with the lowest relative humidity is June (54%).
Average rainfall in December
Jefferson, CO
- Average rainfall in December: 1.34"
The wettest month (with the highest rainfall) is July (3.35").
The driest month (with the least rainfall) is November (1.14").
Average rainfall days in December
Jefferson, CO
- Average rainfall days in December: 4.5 days
The month with the highest number of rainy days is July (22.8 days).
The month with the least rainy days is November (2.8 days).
Average snowfall in December
Jefferson, CO
- Average snowfall in December: 10.83"
The month with the highest snowfall is May (19.69").
The month with the least snowfall is July (0.24").
Average snowfall days in December
Jefferson, CO
- Average snowfall days in December: 17.6 days
The month with the highest number of snowfall days is April (22.8 days).
The month with the least snowfall days is July (1.3 days).
Average daylight in December /
Average sunshine in December
Jefferson, CO
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 5h and 3min
The month with the most sunshine is June (Average sunshine: 11h and 24min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).
Average sunshine days in December
Jefferson, CO
- Average sunshine days in December: 13.2 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is July (5.8 days).
Average UV index in December
Jefferson, CO
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 3).
The months with the lowest UV index are February and December (UV index 1).
Average cloud cover in December
Jefferson, CO
- Average cloud cover in December: 48
The month with the most cloud cover is February (Cloud cover 54).
The month with the least cloud cover is June (Cloud cover 19).
Average visibility in December
Jefferson, CO
- Average visibility in December: 4mi
The months with the highest visibility are June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, April and December (4mi).
Jefferson, Colorado, USA
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