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
A noticeable downshift in temperatures is seen as November gives way to December, with average highs moving from a chilly 43.3°F (6.3°C) to a subzero cold 28.2°F (-2.1°C). During the nights in December, Isabel experiences a consistent average temperature of 16.2°F (-8.8°C).Humidity
The average relative humidity in December is 80%.Rainfall
In Isabel, during December, the rain falls for 4 days and regularly aggregates up to 0.83" (21mm) of precipitation. Throughout the year, there are 99.7 rainfall days, and 16.06" (408mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Isabel, South Dakota, in December, during 10.4 snowfall days, 3.31" (84mm) of snow is typically accumulated. In Isabel, during the entire year, snow falls for 58.3 days and aggregates up to 22.95" (583mm) of snow.Daylight
With an average of 8h and 48min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:05 am and sunset at 4:04 pm. On the last day of December, sunrise is at 7:25 am and sunset at 4:12 pm MST.
Sunshine
In December, the average sunshine is 5.1h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the average person.Note: The maximum UV index, 2 during December, leads to the following recommendations:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Isabel in December?
What is the average humidity in December?
How much does it rain in December?
How much does it snow in Isabel in December?
What is the month with the shortest days?
How many hours of daylight does Isabel have in December?
What time are sunrise and sunset in December?
How many hours of sunshine does Isabel have in December?
What is the month with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Isabel, SD
- Average high temperature in December: 28.2°F
The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in December: 16.2°F
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (13.6°F).
Average pressure in December
Isabel, SD
- Average pressure in December: 30.14"Hg
The months with the highest atmospheric pressure are January and February (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in December
Isabel, SD
- Average wind speed in December: 10.9mph
The windiest month (with the highest average wind speed) is April (12.2mph).
The calmest months (with the lowest average wind speed) are February and August (10.4mph).
Average humidity in December
Isabel, SD
- Average humidity in December: 80%
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are August and September (49%).
Average rainfall in December
Isabel, SD
- Average rainfall in December: 0.83"
The wettest month (with the highest rainfall) is May (2.83").
The driest month (with the least rainfall) is January (0.51").
Average rainfall days in December
Isabel, SD
- Average rainfall days in December: 4 days
The month with the highest number of rainy days is May (14.7 days).
The months with the least rainy days are January and February (3.3 days).
Average snowfall in December
Isabel, SD
- Average snowfall in December: 3.31"
The month with the highest snowfall is February (5.12").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Isabel, SD
- Average snowfall days in December: 10.4 days
The month with the highest number of snowfall days is January (12.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Isabel, SD
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 5h and 1min
The month with the most sunshine is July (Average sunshine: 11h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in December
Isabel, SD
- Average sunshine days in December: 17.3 days
The month with the most sunshine days is September (20.4 days).
The month with the least sunshine days is April (12.4 days).
Average UV index in December
Isabel, SD
- Average UV index in December: 2
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Isabel, SD
- Average cloud cover in December: 47
The month with the most cloud cover is January (Cloud cover 50).
The months with the least cloud cover are July and August (Cloud cover 19).
Average visibility in December
Isabel, SD
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Isabel, South Dakota, USA
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