December weather forecastSaint Charles, ID
December
Weather in December
The first month of the winter, December, is also a subzero cold month in Saint Charles, Idaho, with temperature in the range of an average high of 25.5°F (-3.6°C) and an average low of 9.9°F (-12.3°C).Temperature
Saint Charles's December weather reaches an average high of 25.5°F (-3.6°C) and an average low of 9.9°F (-12.3°C), making it the coldest month.Humidity
The average relative humidity in December is 89%.Rainfall
In Saint Charles, in December, during 5.5 rainfall days, 1.22" (31mm) of precipitation is typically accumulated. In Saint Charles, during the entire year, the rain falls for 105.7 days and collects up to 16.69" (424mm) of precipitation.Snowfall
January through June, September through December are months with snowfall. In December, it is snowing for 18.5 days. Throughout December, 9.09" (231mm) of snow is accumulated. Throughout the year, there are 104.6 snowfall days, and 63.58" (1615mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 12min of daylight.On the first day of December, sunrise is at 7:35 am and sunset at 4:54 pm. On the last day of the month, sunrise is at 7:53 am and sunset at 5:04 pm MST.
Sunshine
The average sunshine in December is 4.6h.UV index
January, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: A maximum daily UV index of 1 during December morphs into the following directions:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Saint Charles, ID
- Average high temperature in December: 25.5°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is December (25.5°F).
- Average low temperature in December: 9.9°F
The month with the highest average low temperature is August (49.8°F).
The coldest month (with the lowest average low temperature) is January (8.4°F).
Average pressure in December
Saint Charles, ID
- Average pressure in December: 30.25"Hg
The month with the highest atmospheric pressure is January (30.29"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Saint Charles, ID
- Average wind speed in December: 4.4mph
The windiest month (with the highest average wind speed) is June (6mph).
The calmest month (with the lowest average wind speed) is January (4.3mph).
Average humidity in December
Saint Charles, ID
- Average humidity in December: 89%
The month with the highest relative humidity is January (92%).
The month with the lowest relative humidity is August (42%).
Average rainfall in December
Saint Charles, ID
- Average rainfall in December: 1.22"
The wettest month (with the highest rainfall) is May (2.28").
The driest month (with the least rainfall) is July (0.91").
Average rainfall days in December
Saint Charles, ID
- Average rainfall days in December: 5.5 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (4.3 days).
Average snowfall in December
Saint Charles, ID
- Average snowfall in December: 9.09"
The month with the highest snowfall is March (12.17").
The months with the least snowfall are July and August (0").
Average snowfall days in December
Saint Charles, ID
- Average snowfall days in December: 18.5 days
The month with the highest number of snowfall days is February (20 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Saint Charles, ID
- Average daylight in December: 9h and 12min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 4h and 36min
The months with the most sunshine are July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in December
Saint Charles, ID
- Average sunshine days in December: 12.6 days
The month with the most sunshine days is July (18.4 days).
The month with the least sunshine days is February (8.6 days).
Average UV index in December
Saint Charles, ID
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in December
Saint Charles, ID
- Average cloud cover in December: 56
The month with the most cloud cover is February (Cloud cover 63).
The months with the least cloud cover are July and August (Cloud cover 13).
Average visibility in December
Saint Charles, ID
- Average visibility in December: 4mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January and February (3mi).
