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
December, with average temperatures reaching a high of 25°F (-3.9°C) and a low of 8.6°F (-13°C), is the coldest month.Humidity
In December, the average relative humidity in Ketchum is 84%.Rainfall
In Ketchum, during December, the rain falls for 7 days and regularly aggregates up to 1.65" (42mm) of precipitation. Throughout the year, in Ketchum, there are 107.7 rainfall days, and 15.63" (397mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through June, September through December. In Ketchum, during December, snow falls for 14 days and regularly aggregates up to 12.05" (306mm) of snow. Throughout the year, in Ketchum, Idaho, there are 88.2 snowfall days, and 69.45" (1764mm) of snow is accumulated.Daylight
With an average of 9h and 0min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:51 am and sunset at 5:01 pm. On the last day of December, sunrise is at 8:10 am and sunset at 5:10 pm MST.
Sunshine
In December, the average sunshine is 5.8h.UV index
In Ketchum, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: The maximum UV index of 2 during December leads to these instructions:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Frequently asked questions
What month is the coldest in Ketchum?
How cold is December in Ketchum?
What is the average humidity in December in Ketchum?
How many days does it rain in December in Ketchum?
How many days does it snow in December in Ketchum?
What is the month with the shortest days in Ketchum?
What is the average length of the day in December in Ketchum?
When are sunrise and sunset in December in Ketchum?
How many hours of sunshine does Ketchum have in December?
How high is the UV index in December in Ketchum?
Average temperature in December
Ketchum, ID
- Average high temperature in December: 25°F
The warmest month (with the highest average high temperature) is July (74.1°F).
The month with the lowest average high temperature is December (25°F).
- Average low temperature in December: 8.6°F
The months with the highest average low temperature are July and August (50.5°F).
The coldest month (with the lowest average low temperature) is January (8.4°F).
Average pressure in December
Ketchum, ID
- Average pressure in December: 30.24"Hg
The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Ketchum, ID
- Average wind speed in December: 4.7mph
The windiest month (with the highest average wind speed) is July (6.3mph).
The calmest month (with the lowest average wind speed) is January (4.5mph).
Average humidity in December
Ketchum, ID
- Average humidity in December: 84%
The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is August (37%).
Average rainfall in December
Ketchum, ID
- Average rainfall in December: 1.65"
The wettest month (with the highest rainfall) is March (2.01").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in December
Ketchum, ID
- Average rainfall days in December: 7 days
The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is July (5.9 days).
Average snowfall in December
Ketchum, ID
- Average snowfall in December: 12.05"
The month with the highest snowfall is February (15").
The months with the least snowfall are July and August (0").
Average snowfall days in December
Ketchum, ID
- Average snowfall days in December: 14 days
The month with the highest number of snowfall days is March (16 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Ketchum, 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 5min
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
Ketchum, ID
- Average sunshine days in December: 15.8 days
The month with the most sunshine days is July (20.8 days).
The month with the least sunshine days is April (11.1 days).
Average UV index in December
Ketchum, ID
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 5).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in December
Ketchum, ID
- Average cloud cover in December: 40
The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 10).
Average visibility in December
Ketchum, ID
- Average visibility in December: 4mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).
Ketchum, Idaho, USA
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