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's arrival sees a clear drop in the average high-temperature, decreasing from November's frosty 46.4°F (8°C) to a subzero cold 31.5°F (-0.3°C). Throughout the month of December, the nighttime temperature dips to an average of 20.7°F (-6.3°C).Humidity
In December, the average relative humidity is 78%.Rainfall
In December, the rain falls for 2 days. Throughout December, 0.98" (25mm) of precipitation is accumulated. Throughout the year, in Saint Charles, there are 109.3 rainfall days, and 19.41" (493mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. The month with the most snowfall is December, when snow falls for 5.8 days and typically aggregates up to 3.66" (93mm) of snow.Daylight
The month with the shortest days in Saint Charles is December, with an average of 9h and 6min of daylight.On the first day of December, sunrise is at 7:48 am and sunset at 5:02 pm. On the last day of the month, sunrise is at 8:07 am and sunset at 5:11 pm CST.
Sunshine
In Saint Charles, the average sunshine in December is 5.1h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: A daily maximum UV index of 2 in December translates into the following instructions:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Saint Charles?
What is the average humidity in December in Saint Charles?
How many days does it rain in December in Saint Charles?
What is the snowiest month in Saint Charles?
How many days does it snow in December in Saint Charles?
What is the month with the shortest days in Saint Charles?
What is the average length of the day in December in Saint Charles?
What time are sunrise and sunset in December in Saint Charles?
How many hours of sunshine does Saint Charles have in December?
When is the lowest UV index in Saint Charles?
What is the UV index reading in December in Saint Charles?
Average temperature in December
Saint Charles, SD
- Average high temperature in December: 31.5°F
The warmest month (with the highest average high temperature) is July (85.1°F).
The month with the lowest average high temperature is January (29.7°F).
- Average low temperature in December: 20.7°F
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (17.2°F).
Average pressure in December
Saint Charles, SD
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in December
Saint Charles, SD
- Average wind speed in December: 11.6mph
The windiest month (with the highest average wind speed) is April (12.2mph).
The calmest month (with the lowest average wind speed) is July (9.3mph).
Average humidity in December
Saint Charles, SD
- Average humidity in December: 78%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is October (61%).
Average rainfall in December
Saint Charles, SD
- Average rainfall in December: 0.98"
The wettest month (with the highest rainfall) is May (3.03").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in December
Saint Charles, SD
- Average rainfall days in December: 2 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is January (1.6 days).
Average snowfall in December
Saint Charles, SD
- Average snowfall in December: 3.66"
The month with the highest snowfall is December (3.66").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Saint Charles, SD
- Average snowfall days in December: 5.8 days
The month with the highest number of snowfall days is February (7.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Saint Charles, SD
- Average daylight in December: 9h and 1min
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 1min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).
Average sunshine days in December
Saint Charles, SD
- Average sunshine days in December: 22.1 days
The month with the most sunshine days is November (23.4 days).
The month with the least sunshine days is June (9.6 days).
Average UV index in December
Saint Charles, SD
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Saint Charles, SD
- Average cloud cover in December: 44
The month with the most cloud cover is January (Cloud cover 49).
The months with the least cloud cover are July, August and September (Cloud cover 25).
Average visibility in December
Saint Charles, 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).
Saint Charles, South Dakota, USA
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