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 arrival of December brings a distinct temperature shift, with the average high-temperature dropping from a frosty 45.5°F (7.5°C) in November to a subzero cold 29.1°F (-1.6°C). December's nights in Fort Thompson observe an average temperature of 16.9°F (-8.4°C).Humidity
In December, the average relative humidity in Fort Thompson is 82%.Rainfall
In Fort Thompson, during December, the rain falls for 3.9 days and regularly aggregates up to 0.94" (24mm) of precipitation. Throughout the year, there are 107.6 rainfall days, and 17.83" (453mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall in Fort Thompson. In Fort Thompson, in December, snow falls for 9.6 days, with typically accumulated 3.07" (78mm) of snow. Throughout the year, in Fort Thompson, there are 50.9 snowfall days, and 17.87" (454mm) of snow is accumulated.Daylight
The month with the shortest days in Fort Thompson is December, with an average of 8h and 54min of daylight.On the first day of the month, sunrise is at 7:53 am and sunset at 5:00 pm. On the last day of December, sunrise is at 8:12 am and sunset at 5:09 pm CST.
Sunshine
In Fort Thompson, the average sunshine in December is 4.9h.UV index
In December, the average daily maximum UV index in Fort Thompson is 2. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for the average person.Note: A maximum high daily UV index of 2 during December translates into the following directions:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Frequently asked questions
How cold is December in Fort Thompson?
What is the average humidity in December in Fort Thompson?
How much does it rain in Fort Thompson in December?
How many days does it snow in December in Fort Thompson?
What is the month with the shortest days in Fort Thompson?
What is the average length of the day in December in Fort Thompson?
What time are sunrise and sunset in December in Fort Thompson?
How long on average sun shines in December in Fort Thompson?
How high is the UV index in December in Fort Thompson?
Average temperature in December
Fort Thompson, SD
- Average high temperature in December: 29.1°F
The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (26.1°F).
- Average low temperature in December: 16.9°F
The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (12.6°F).
Average pressure in December
Fort Thompson, SD
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in December
Fort Thompson, SD
- Average wind speed in December: 10mph
The windiest month (with the highest average wind speed) is April (11.3mph).
The calmest month (with the lowest average wind speed) is August (9.1mph).
Average humidity in December
Fort Thompson, SD
- Average humidity in December: 82%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is September (58%).
Average rainfall in December
Fort Thompson, SD
- Average rainfall in December: 0.94"
The wettest month (with the highest rainfall) is June (3.03").
The driest month (with the least rainfall) is November (0.55").
Average rainfall days in December
Fort Thompson, SD
- Average rainfall days in December: 3.9 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is February (3.3 days).
Average snowfall in December
Fort Thompson, SD
- Average snowfall in December: 3.07"
The month with the highest snowfall is February (3.66").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Fort Thompson, SD
- Average snowfall days in December: 9.6 days
The months with the highest number of snowfall days are January and February (11.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Fort Thompson, SD
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in December
Fort Thompson, SD
- Average sunshine days in December: 19.5 days
The month with the most sunshine days is November (20.7 days).
The month with the least sunshine days is April (11.8 days).
Average UV index in December
Fort Thompson, SD
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in December
Fort Thompson, SD
- Average cloud cover in December: 47
The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in December
Fort Thompson, SD
- 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).
Fort Thompson, South Dakota, USA
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