December weather forecastJamestown, CO
December
Weather in December
The first month of the winter, December, is also an icy month in Jamestown, Colorado, with temperature in the range of an average low of 18.1°F (-7.7°C) and an average high of 35.2°F (1.8°C).Temperature
Jamestown's coldest temperatures are experienced in December, with average high temperatures of 35.2°F (1.8°C) and lows of 18.1°F (-7.7°C).Humidity
In December, the average relative humidity is 65%.Rainfall
In Jamestown, during December, the rain falls for 3.9 days and regularly aggregates up to 0.51" (13mm) of precipitation. In Jamestown, during the entire year, the rain falls for 117.3 days and collects up to 14.17" (360mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Jamestown, Colorado. In Jamestown, during December, snow falls for 7.2 days and regularly aggregates up to 3.94" (100mm) of snow. In Jamestown, during the entire year, snow falls for 44.8 days and aggregates up to 37.01" (940mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 7:05 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:46 pm MST.
Sunshine
In December, the average sunshine is 6.8h.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 unsafe exposure to UV radiation for average individuals.Note: The average daily UV index of 2 in December transforms into the following instructions:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Jamestown, CO
- Average high temperature in December: 35.2°F
The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is December (35.2°F).
- Average low temperature in December: 18.1°F
The month with the highest average low temperature is July (55.2°F).
The coldest month (with the lowest average low temperature) is February (18°F).
Average pressure in December
Jamestown, CO
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The months with the lowest atmospheric pressure are April, May and June (29.92"Hg).
Average wind speed in December
Jamestown, CO
- Average wind speed in December: 6.8mph
The windiest month (with the highest average wind speed) is January (7.3mph).
The calmest months (with the lowest average wind speed) are May, July, August and September (5.7mph).
Average humidity in December
Jamestown, CO
- Average humidity in December: 65%
The month with the highest relative humidity is February (70%).
The months with the lowest relative humidity are June, August and September (45%).
Average rainfall in December
Jamestown, CO
- Average rainfall in December: 0.51"
The wettest month (with the highest rainfall) is May (2.48").
The driest month (with the least rainfall) is January (0.39").
Average rainfall days in December
Jamestown, CO
- Average rainfall days in December: 3.9 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is November (3.3 days).
Average snowfall in December
Jamestown, CO
- Average snowfall in December: 3.94"
The month with the highest snowfall is April (7.76").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Jamestown, CO
- Average snowfall days in December: 7.2 days
The month with the highest number of snowfall days is February (10.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Jamestown, CO
- Average daylight in December: 9h and 24min
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 24min).
- Average sunshine in December: 6h and 48min
The months with the most sunshine are June and July (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 6h and 36min).
Average sunshine days in December
Jamestown, CO
- Average sunshine days in December: 21.9 days
The month with the most sunshine days is January (22.2 days).
The month with the least sunshine days is July (9.9 days).
Average UV index in December
Jamestown, CO
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Jamestown, CO
- Average cloud cover in December: 24
The months with the most cloud cover are April and May (Cloud cover 28).
The month with the least cloud cover is September (Cloud cover 16).
Average visibility in December
Jamestown, CO
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
