December weather forecastRupert, ID
December
Weather in December
The city of Rupert, Idaho sees the year off under the stronghold of winter in December. The sharp descent from November’s weather conditions is quite striking. Characterized by shorter days and the triumphant return of snowfall, December identifies as very much a winter month. Against the practically absent snowfall in November, it's an unmistakable herald of the full-fledged winter setting up its reign for the coming January.Temperature
Rupert's December weather reaches an average high of 32.5°F (0.3°C) and an average low of 21.6°F (-5.8°C), making it the coldest month.Humidity
In December, the average relative humidity is 79%.Rainfall
In Rupert, in December, it is raining for 8.7 days, with typically 1.34" (34mm) of accumulated precipitation. Throughout the year, in Rupert, there are 105.2 rainfall days, and 10.63" (270mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. The month with the most snowfall is December, when snow falls for 13 days and typically aggregates up to 6.54" (166mm) of snow.Daylight
The month with the shortest days in Rupert is December, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:45 am and sunset at 5:02 pm. On the last day of December, in Rupert, sunrise is at 8:04 am and sunset at 5:11 pm MST.
Sunshine
In December, the average sunshine in Rupert is 5.8h.UV index
The month with the lowest UV index in Rupert is December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: In December, the maximum UV index of 1 translates into these guidelines:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Rupert, ID
- Average high temperature in December: 32.5°F
The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is December (32.5°F).
- Average low temperature in December: 21.6°F
The months with the highest average low temperature are July and August (60.8°F).
The coldest month (with the lowest average low temperature) is December (21.6°F).
Average pressure in December
Rupert, ID
- Average pressure in December: 30.24"Hg
The month with the highest atmospheric pressure is January (30.29"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in December
Rupert, ID
- Average wind speed in December: 7.3mph
The windiest month (with the highest average wind speed) is April (9.8mph).
The calmest month (with the lowest average wind speed) is January (7.1mph).
Average humidity in December
Rupert, ID
- Average humidity in December: 79%
The month with the highest relative humidity is January (80%).
The months with the lowest relative humidity are July and August (30%).
Average rainfall in December
Rupert, ID
- Average rainfall in December: 1.34"
The wettest month (with the highest rainfall) is March (1.46").
The driest month (with the least rainfall) is July (0.28").
Average rainfall days in December
Rupert, ID
- Average rainfall days in December: 8.7 days
The months with the highest number of rainy days are March and April (14 days).
The months with the least rainy days are July and August (5.2 days).
Average snowfall in December
Rupert, ID
- Average snowfall in December: 6.54"
The month with the highest snowfall is December (6.54").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Rupert, ID
- Average snowfall days in December: 13 days
The month with the highest number of snowfall days is December (13 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Rupert, ID
- Average daylight in December: 9h and 6min
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 48min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 42min).
Average sunshine days in December
Rupert, ID
- Average sunshine days in December: 13.8 days
The month with the most sunshine days is July (22.6 days).
The month with the least sunshine days is March (12 days).
Average UV index in December
Rupert, ID
- Average UV index in December: 1
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Rupert, ID
- Average cloud cover in December: 40
The month with the most cloud cover is December (Cloud cover 40).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility in December
Rupert, ID
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
