December weather forecastNew Castle, CO
December
Weather in December
December, the first month of the winter in New Castle, is still a freezing cold month, with an average temperature varying between 30.7°F (-0.7°C) and 14.9°F (-9.5°C).Temperature
Setting in of December comes with a decrease in the average high-temperature, moving from a wintry 42.1°F (5.6°C) in November to a freezing cold 30.7°F (-0.7°C). Throughout December, an average low-temperature of 14.9°F (-9.5°C) is experienced.Humidity
The average relative humidity in December is 79%.Rainfall
In New Castle, in December, it is raining for 8.4 days, with typically 1.14" (29mm) of accumulated precipitation. In New Castle, during the entire year, the rain falls for 107.7 days and collects up to 11.89" (302mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in New Castle. In New Castle, in December, during 11 snowfall days, 7.05" (179mm) of snow is typically accumulated. In New Castle, during the entire year, snow falls for 58.6 days and aggregates up to 36.85" (936mm) of snow.Daylight
The month with the shortest days in New Castle, Colorado, is December, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:12 am and sunset at 4:46 pm. On the last day of December, sunrise is at 7:30 am and sunset at 4:56 pm MST.
Sunshine
The average sunshine in December is 6.4h.UV index
The months with the lowest UV index in New Castle are January through March, 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 unsafe exposure to UV radiation for the ordinary person.Note: An average maximum UV index of 2 in December leads to these recommendations:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
New Castle, CO
- Average high temperature in December: 30.7°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (30.6°F).
- Average low temperature in December: 14.9°F
The month with the highest average low temperature is July (50.4°F).
The coldest month (with the lowest average low temperature) is January (12°F).
Average pressure in December
New Castle, CO
- Average pressure in December: 30.2"Hg
The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is May (29.93"Hg).
Average wind speed in December
New Castle, CO
- Average wind speed in December: 4.2mph
The windiest month (with the highest average wind speed) is June (6.2mph).
The calmest month (with the lowest average wind speed) is January (4.1mph).
Average humidity in December
New Castle, CO
- Average humidity in December: 79%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is June (43%).
Average rainfall in December
New Castle, CO
- Average rainfall in December: 1.14"
The wettest month (with the highest rainfall) is April (1.57").
The driest month (with the least rainfall) is September (0.51").
Average rainfall days in December
New Castle, CO
- Average rainfall days in December: 8.4 days
The month with the highest number of rainy days is April (14 days).
The month with the least rainy days is June (5.9 days).
Average snowfall in December
New Castle, CO
- Average snowfall in December: 7.05"
The month with the highest snowfall is February (8.74").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
New Castle, CO
- Average snowfall days in December: 11 days
The month with the highest number of snowfall days is January (13 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
New Castle, 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: 6h and 24min
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: 6h and 6min).
Average sunshine days in December
New Castle, CO
- Average sunshine days in December: 16.9 days
The month with the most sunshine days is June (20.7 days).
The month with the least sunshine days is April (11.7 days).
Average UV index in December
New Castle, 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, March, October, November and December (UV index 2).
Average cloud cover in December
New Castle, CO
- Average cloud cover in December: 34
The month with the most cloud cover is February (Cloud cover 39).
The months with the least cloud cover are June and September (Cloud cover 12).
Average visibility in December
New Castle, CO
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
