December weather forecastIrmo, SC
December
Weather in December
In December, Irmo, South Carolina, experiences the chill of winter with temperatures hitting their lowest for the year. It's a time of year marked by cozy indoor activities, warm drinks, and the holiday season. A slight snowfall of 0.08" (2mm) can be witnessed, indicating the arrival of winter. The increase in cloud cover, along with shorter daylight hours, further accentuates the wintry atmosphere. Bidding goodbye to the year, residents prepare for January, continuing the cycle of weather changes with its distinct cold.Temperature
The onset of December in Irmo, South Carolina, results in a small decrease in the average high-temperature, moderately receding from an enjoyable 62.2°F (16.8°C) in November to a mild 55.8°F (13.2°C). Throughout December, an average nighttime temperature of 41.2°F (5.1°C) is experienced in Irmo, South Carolina.Humidity
The most humid month is December, with an average relative humidity of 75%.Rainfall
The month with the most rainfall is December, when the rain falls for 11.1 days and typically aggregates up to 3.11" (79mm) of precipitation.Snowfall
Months with snowfall in Irmo are January through March and December. December is the first month it typically snows. Throughout December, in the average 0.1 snowfall days, it receives 0.08" (2mm) of snow. Throughout the year, there are 1.2 snowfall days, and 0.79" (20mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 54min of daylight.On the first day of December, sunrise is at 7:12 am and sunset at 5:15 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 5:25 pm EST.
Sunshine
December has the least sunshine of the year, with an average of 5.5h of sunshine.UV index
In Irmo, South Carolina, the average daily maximum UV index in December is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: The UV index of 3 in December translates into these instructions:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Irmo, SC
- Average high temperature in December: 55.8°F
The warmest month (with the highest average high temperature) is July (91.4°F).
The month with the lowest average high temperature is January (52.3°F).
- Average low temperature in December: 41.2°F
The month with the highest average low temperature is July (72.9°F).
The coldest month (with the lowest average low temperature) is January (36.9°F).
Average pressure in December
Irmo, SC
- Average pressure in December: 30.14"Hg
The months with the highest atmospheric pressure are January, November and December (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in December
Irmo, SC
- Average wind speed in December: 7.3mph
The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in December
Irmo, 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 (70%).
Average rainfall in December
Irmo, SC
- Average rainfall in December: 3.11"
The wettest month (with the highest rainfall) is December (3.11").
The driest month (with the least rainfall) is September (1.54").
Average rainfall days in December
Irmo, SC
- Average rainfall days in December: 11.1 days
The month with the highest number of rainy days is July (17.4 days).
The month with the least rainy days is October (7.8 days).
Average snowfall in December
Irmo, SC
- Average snowfall in December: 0.08"
The month with the highest snowfall is February (0.43").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in December
Irmo, SC
- Average snowfall days in December: 0.1 days
The month with the highest number of snowfall days is January (0.5 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
Irmo, SC
- Average daylight in December: 9h and 54min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in December: 5h and 30min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in December
Irmo, SC
- Average sunshine days in December: 18.8 days
The month with the most sunshine days is October (21.8 days).
The month with the least sunshine days is July (10.8 days).
Average UV index in December
Irmo, SC
- Average UV index in December: 3
The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is January (UV index 2).
Average cloud cover in December
Irmo, SC
- Average cloud cover in December: 41
The months with the most cloud cover are February and December (Cloud cover 41).
The months with the least cloud cover are June and October (Cloud cover 28).
Average visibility in December
Irmo, 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).
