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
December
Weather in December
Temperature
December's arrival comes with a mild decrease in the average high-temperature, moving subtly from a refreshing 59.9°F (15.5°C) in November to a fresh 53.1°F (11.7°C). In December, Fort Mill encounters an average low-temperature of 39°F (3.9°C) during the night.Humidity
With an average relative humidity of 75%, December is the most humid month.Rainfall
In Fort Mill, in December, it is raining for 10 days, with typically 2.91" (74mm) of accumulated precipitation. In Fort Mill, during the entire year, the rain falls for 146.1 days and collects up to 28.94" (735mm) of precipitation.Snowfall
January through March and December are months with snowfall. December is the first month it typically snows. Throughout December, in the average 0.5 snowfall days, it receives 0.83" (21mm) of snow. Throughout the year, there are 3.1 snowfall days, and 3.58" (91mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 48min of daylight.On the first day of December, sunrise is at 7:13 am and sunset at 5:12 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 5:22 pm EST.
Sunshine
With an average of 5.3h of sunshine, December has the least sunshine of the year.UV index
January and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for average individuals.Note: The UV index of 2 in December translates into these instructions:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. To guard against the harmful effects of the Sun, minimize exposure during midday. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are December temperatures?
What is the most humid month in Fort Mill?
What is the average humidity in December in Fort Mill?
How much does it rain in December?
When does it start snowing?
What is the month with the shortest days?
What is the average length of the day in December?
When is the sunrise / sunset in December?
What is the month with the least sunshine in Fort Mill?
How long on average sun shines in December?
When is the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Fort Mill, SC
- Average high temperature in December: 53.1°F
The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is January (49.6°F).
- Average low temperature in December: 39°F
The month with the highest average low temperature is July (70.7°F).
The coldest month (with the lowest average low temperature) is January (34.3°F).
Average pressure in December
Fort Mill, SC
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed in December
Fort Mill, SC
- Average wind speed in December: 6.8mph
The windiest months (with the highest average wind speed) are February and April (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in December
Fort Mill, SC
- Average humidity in December: 75%
The month with the highest relative humidity is December (75%).
The month with the lowest relative humidity is July (69%).
Average rainfall in December
Fort Mill, SC
- Average rainfall in December: 2.91"
The wettest month (with the highest rainfall) is August (3.23").
The driest months (with the least rainfall) are September and October (1.81").
Average rainfall days in December
Fort Mill, SC
- Average rainfall days in December: 10 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is November (8.3 days).
Average snowfall in December
Fort Mill, SC
- Average snowfall in December: 0.83"
The month with the highest snowfall is February (1.26").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in December
Fort Mill, SC
- Average snowfall days in December: 0.5 days
The month with the highest number of snowfall days is February (1.4 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in December /
Average sunshine in December
Fort Mill, SC
- Average daylight in December: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in December: 5h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days in December
Fort Mill, SC
- Average sunshine days in December: 19.8 days
The month with the most sunshine days is October (22 days).
The month with the least sunshine days is July (11.8 days).
Average UV index in December
Fort Mill, SC
- 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 and December (UV index 2).
Average cloud cover in December
Fort Mill, SC
- Average cloud cover in December: 44
The months with the most cloud cover are February and December (Cloud cover 44).
The month with the least cloud cover is June (Cloud cover 30).
Average visibility in December
Fort Mill, SC
- 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).