December weather forecastCaldwell, ID
December
Weather in December
December brings along the holiday spirit and a noticeable change in the atmosphere. Caldwell steps into December with a significant lowering of temperatures, making it the coldest month at 36.3°F (2.4°C) and marking the onset of winter. It is also the time where snow starts to adorn the cityscape, transforming Caldwell into a true winter wonderland. While outdoor activities dwindle, warm indoor get-togethers bolster the city’s spirits.Temperature
With average high and low temperatures of 36.3°F (2.4°C) and 24.8°F (-4°C) respectively, December is Caldwell's coldest month.Humidity
In Caldwell, the average relative humidity in December is 76%.Rainfall
In Caldwell, during December, the rain falls for 9.9 days and regularly aggregates up to 1.34" (34mm) of precipitation. In Caldwell, during the entire year, the rain falls for 103.7 days and collects up to 9.84" (250mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. The month with the most snowfall is December, when snow falls for 7.2 days and typically aggregates up to 3.35" (85mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 0min of daylight.On the first day of the month, sunrise is at 8:01 am and sunset at 5:11 pm. On the last day of December, sunrise is at 8:20 am and sunset at 5:20 pm MST.
Sunshine
With an average of 5.7h of sunshine, December has the least sunshine of the year.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 reading of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 2 during December translates into the following guidance:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Caldwell, ID
- Average high temperature in December: 36.3°F
The warmest month (with the highest average high temperature) is July (90.9°F).
The month with the lowest average high temperature is December (36.3°F).
- Average low temperature in December: 24.8°F
The month with the highest average low temperature is August (62.8°F).
The coldest month (with the lowest average low temperature) is December (24.8°F).
Average pressure in December
Caldwell, ID
- Average pressure in December: 30.21"Hg
The month with the highest atmospheric pressure is January (30.25"Hg).
The months with the lowest atmospheric pressure are June and August (29.91"Hg).
Average wind speed in December
Caldwell, ID
- Average wind speed in December: 5.9mph
The windiest month (with the highest average wind speed) is April (7.3mph).
The calmest month (with the lowest average wind speed) is January (5.2mph).
Average humidity in December
Caldwell, ID
- Average humidity in December: 76%
The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (29%).
Average rainfall in December
Caldwell, ID
- Average rainfall in December: 1.34"
The wettest month (with the highest rainfall) is March (1.38").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in December
Caldwell, ID
- Average rainfall days in December: 9.9 days
The month with the highest number of rainy days is March (15.1 days).
The month with the least rainy days is August (3.5 days).
Average snowfall in December
Caldwell, ID
- Average snowfall in December: 3.35"
The month with the highest snowfall is December (3.35").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Caldwell, ID
- Average snowfall days in December: 7.2 days
The month with the highest number of snowfall days is December (7.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Caldwell, ID
- Average daylight in December: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in December: 5h and 42min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in December
Caldwell, ID
- Average sunshine days in December: 17 days
The month with the most sunshine days is July (23.3 days).
The month with the least sunshine days is March (14.6 days).
Average UV index in December
Caldwell, ID
- Average UV index in December: 2
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Caldwell, ID
- Average cloud cover in December: 39
The month with the most cloud cover is December (Cloud cover 39).
The months with the least cloud cover are July and August (Cloud cover 8).
Average visibility in December
Caldwell, ID
- 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).
