December weather forecastGrangeville, ID
December
Weather in December
Come December, Grangeville is completely submerged in winter, with the weather becoming harsh and frigid. The visible transition from November is the increase in snowfall, standing at nearly 13" (330mm), the highest of the year. As the daylight hours reach their lowest, the festive spirit begins to lighten up the wintry gloom. While the chill necessitates bundling up in warm attire, the magic of the holiday season provides a sense of cheer throughout the month. Despite the severe cold weather, December in Grangeville, Idaho is a truly special time in the white winter wonderland.Temperature
In Grangeville, the month of December is known for its lowest average temperatures, reaching a high of 33.6°F (0.9°C) and a low of 21.7°F (-5.7°C).Humidity
In December, the average relative humidity in Grangeville is 87%.Rainfall
In December, the rain falls for 9.1 days. Throughout December, 2.2" (56mm) of precipitation is accumulated. Throughout the year, there are 146.2 rainfall days, and 23.35" (593mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. In Grangeville, during December, snow falls for 16.9 days and regularly aggregates up to 12.8" (325mm) of snow. Throughout the year, there are 80.3 snowfall days, and 60.47" (1536mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 8h and 42min of daylight.On the first day of December, sunrise is at 7:06 am and sunset at 4:01 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:09 pm PST.
Sunshine
In December, the average sunshine is 4.9h.UV index
In Grangeville, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum daily UV index of 2 in December converts into the following recommendations:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Grangeville, ID
- Average high temperature in December: 33.6°F
The warmest month (with the highest average high temperature) is August (82.6°F).
The month with the lowest average high temperature is December (33.6°F).
- Average low temperature in December: 21.7°F
The month with the highest average low temperature is August (53.2°F).
The coldest month (with the lowest average low temperature) is December (21.7°F).
Average pressure in December
Grangeville, ID
- Average pressure in December: 30.19"Hg
The month with the highest atmospheric pressure is January (30.21"Hg).
The months with the lowest atmospheric pressure are June and August (29.94"Hg).
Average wind speed in December
Grangeville, ID
- Average wind speed in December: 4.8mph
The windiest months (with the highest average wind speed) are January and November (4.9mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).
Average humidity in December
Grangeville, ID
- Average humidity in December: 87%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is August (47%).
Average rainfall in December
Grangeville, ID
- Average rainfall in December: 2.2"
The wettest month (with the highest rainfall) is April (2.91").
The driest month (with the least rainfall) is July (0.59").
Average rainfall days in December
Grangeville, ID
- Average rainfall days in December: 9.1 days
The month with the highest number of rainy days is April (19.3 days).
The month with the least rainy days is August (6.8 days).
Average snowfall in December
Grangeville, ID
- Average snowfall in December: 12.8"
The month with the highest snowfall is February (12.95").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Grangeville, ID
- Average snowfall days in December: 16.9 days
The month with the highest number of snowfall days is December (16.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Grangeville, ID
- Average daylight in December: 8h and 42min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 4h and 54min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in December
Grangeville, ID
- Average sunshine days in December: 11.5 days
The month with the most sunshine days is August (22.2 days).
The month with the least sunshine days is March (7.5 days).
Average UV index in December
Grangeville, ID
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in December
Grangeville, ID
- Average cloud cover in December: 50
The month with the most cloud cover is February (Cloud cover 53).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in December
Grangeville, ID
- Average visibility in December: 4mi
The months with the highest visibility are May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).
