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
The month of December sees the lowest average temperatures, reaching 34.2°F (1.2°C) at the peak and 22.8°F (-5.1°C) at the low.Humidity
The average relative humidity in December is 77%.Rainfall
In December, the rain falls for 5.9 days. Throughout December, 1.06" (27mm) of precipitation is accumulated. In Castleford, during the entire year, the rain falls for 85.9 days and collects up to 8.27" (210mm) of precipitation.Snowfall
January through April, October through December are months with snowfall. In December, it is snowing for 8.3 days. Throughout December, 4.37" (111mm) of snow is accumulated. Throughout the year, there are 33.1 snowfall days, and 16.14" (410mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 6min of daylight.On the first day of December, sunrise is at 7:50 am and sunset at 5:07 pm. On the last day of the month, sunrise is at 8:09 am and sunset at 5:16 pm MST.
Sunshine
December has the least sunshine of the year, with an average of 5.8h of sunshine.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 estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: In December, the average maximum UV index of 2 translates into the following recommendations:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Opt for tightly woven and loose clothing to enhance protection from the Sun. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month?
How cold is December?
What is the average humidity in December?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Castleford have in December?
What time are sunrise and sunset in December?
What is the month with the least sunshine?
How long on average sun shines in December in Castleford?
When is the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Castleford, ID
- Average high temperature in December: 34.2°F
The warmest month (with the highest average high temperature) is July (89.8°F).
The month with the lowest average high temperature is December (34.2°F).
- Average low temperature in December: 22.8°F
The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is December (22.8°F).
Average pressure in December
Castleford, ID
- Average pressure in December: 30.23"Hg
The month with the highest atmospheric pressure is January (30.28"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in December
Castleford, ID
- Average wind speed in December: 7.8mph
The windiest month (with the highest average wind speed) is April (10mph).
The calmest month (with the lowest average wind speed) is August (7.2mph).
Average humidity in December
Castleford, ID
- Average humidity in December: 77%
The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is July (27%).
Average rainfall in December
Castleford, ID
- Average rainfall in December: 1.06"
The wettest month (with the highest rainfall) is January (1.18").
The driest month (with the least rainfall) is July (0.28").
Average rainfall days in December
Castleford, ID
- Average rainfall days in December: 5.9 days
The month with the highest number of rainy days is March (10.8 days).
The month with the least rainy days is October (5.2 days).
Average snowfall in December
Castleford, ID
- Average snowfall in December: 4.37"
The month with the highest snowfall is January (5").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Castleford, ID
- Average snowfall days in December: 8.3 days
The month with the highest number of snowfall days is January (8.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Castleford, ID
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 5h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in December
Castleford, ID
- Average sunshine days in December: 19.3 days
The month with the most sunshine days is October (24.5 days).
The month with the least sunshine days is February (16.1 days).
Average UV index in December
Castleford, 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
Castleford, 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 10).
Average visibility in December
Castleford, 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).
Castleford, Idaho, USA
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