December weather forecastCastlewood, CO
December
Weather in December
The first month of the winter, December, is still a cold month in Castlewood, Colorado, with an average temperature varying between 40.3°F (4.6°C) and 20.7°F (-6.3°C).Temperature
Castlewood's temperature records reveal December as the coldest month, marked by average highs of 40.3°F (4.6°C) and lows of 20.7°F (-6.3°C).Humidity
In December, the average relative humidity is 61%.Rainfall
In Castlewood, in December, it is raining for 4.4 days, with typically 0.51" (13mm) of accumulated precipitation. Throughout the year, there are 94.2 rainfall days, and 11.97" (304mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Castlewood, in December, snow falls for 7.6 days, with typically accumulated 3.39" (86mm) of snow. Throughout the year, there are 46.5 snowfall days, and 37.2" (945mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:01 am and sunset at 4:36 pm. On the last day of December, sunrise is at 7:20 am and sunset at 4:45 pm MST.
Sunshine
In Castlewood, the average sunshine in December is 7h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: An average UV index of 2 in December transforms into this advice:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Castlewood, CO
- Average high temperature in December: 40.3°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is December (40.3°F).
- Average low temperature in December: 20.7°F
The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is December (20.7°F).
Average pressure in December
Castlewood, CO
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are April and June (29.91"Hg).
Average wind speed in December
Castlewood, CO
- Average wind speed in December: 6.5mph
The windiest month (with the highest average wind speed) is April (7.8mph).
The calmest months (with the lowest average wind speed) are August and December (6.5mph).
Average humidity in December
Castlewood, CO
- Average humidity in December: 61%
The month with the highest relative humidity is February (65%).
The months with the lowest relative humidity are June, August and September (43%).
Average rainfall in December
Castlewood, CO
- Average rainfall in December: 0.51"
The wettest month (with the highest rainfall) is May (2.2").
The driest month (with the least rainfall) is September (0.47").
Average rainfall days in December
Castlewood, CO
- Average rainfall days in December: 4.4 days
The month with the highest number of rainy days is May (14.2 days).
The month with the least rainy days is November (3.4 days).
Average snowfall in December
Castlewood, CO
- Average snowfall in December: 3.39"
The month with the highest snowfall is April (6.34").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Castlewood, CO
- Average snowfall days in December: 7.6 days
The month with the highest number of snowfall days is February (9.4 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Castlewood, CO
- Average daylight in December: 9h and 24min
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: 7h and 0min
The months with the most sunshine are June and July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 48min).
Average sunshine days in December
Castlewood, CO
- Average sunshine days in December: 21.5 days
The month with the most sunshine days is November (23.2 days).
The month with the least sunshine days is April (12.7 days).
Average UV index in December
Castlewood, CO
- 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
Castlewood, CO
- Average cloud cover in December: 22
The month with the most cloud cover is April (Cloud cover 26).
The months with the least cloud cover are June and September (Cloud cover 15).
Average visibility in December
Castlewood, 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).
