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 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
In December, the average high-temperature marginally drops from an enjoyable 66.9°F (19.4°C) in November to a still comfortable 61.3°F (16.3°C). In Port Royal, the December nights cool down to an average low of 49.1°F (9.5°C).Humidity
With an average relative humidity of 77%, December is the most humid month.Rainfall
In Port Royal, in December, during 10.5 rainfall days, 2.05" (52mm) of precipitation is typically accumulated. In Port Royal, during the entire year, the rain falls for 154.7 days and collects up to 23.11" (587mm) of precipitation.Snowfall
Months with snowfall are January, February and December. December is the first month it typically snows. Throughout December, there are 0.1 snowfall days. Throughout the year, there are 0.4 snowfall days.Daylight
The month with the shortest days is December, with an average of 10h and 6min of daylight.On the first day of the month, sunrise is at 7:06 am and sunset at 5:17 pm. On the last day of December, sunrise is at 7:24 am and sunset at 5:28 pm EST.
Sunshine
The month with the least sunshine is December, with an average of 5.6h of sunshine.UV index
In December, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 4 during December translates into the following directions:
Prioritize safety - Recommendations to avert sunburn are shared. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Always opt for UVA and UVB-resistant sunglasses on radiant days. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Port Royal in December?
What is the most humid month?
What is the average humidity in December in Port Royal?
How many days 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?
What time are sunrise and sunset in December?
What is the month with the least sunshine?
How many hours of sunshine does Port Royal have in December?
How high is the UV index in December?
Average temperature in December
Port Royal, SC
- Average high temperature in December: 61.3°F
The warmest month (with the highest average high temperature) is July (89.6°F).
The month with the lowest average high temperature is January (57.6°F).
- Average low temperature in December: 49.1°F
The month with the highest average low temperature is August (76.6°F).
The coldest month (with the lowest average low temperature) is January (44.1°F).
Average pressure in December
Port Royal, SC
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June and August (29.98"Hg).
Average wind speed in December
Port Royal, SC
- Average wind speed in December: 7.8mph
The windiest month (with the highest average wind speed) is April (8.2mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in December
Port Royal, SC
- Average humidity in December: 77%
The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is March (71%).
Average rainfall in December
Port Royal, SC
- Average rainfall in December: 2.05"
The wettest month (with the highest rainfall) is August (3.54").
The driest month (with the least rainfall) is February (0.87").
Average rainfall days in December
Port Royal, SC
- Average rainfall days in December: 10.5 days
The month with the highest number of rainy days is August (21.8 days).
The month with the least rainy days is November (6.8 days).
Average snowfall days in December
Port Royal, SC
- Average snowfall days in December: 0.1 days
The month with the highest number of snowfall days is January (0.2 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).
Average daylight in December /
Average sunshine in December
Port Royal, SC
- Average daylight in December: 10h and 1min
The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in December: 5h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).
Average sunshine days in December
Port Royal, SC
- Average sunshine days in December: 18.4 days
The month with the most sunshine days is November (20.7 days).
The month with the least sunshine days is August (5.3 days).
Average UV index in December
Port Royal, SC
- Average UV index in December: 4
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 3).
Average cloud cover in December
Port Royal, SC
- Average cloud cover in December: 39
The months with the most cloud cover are February and December (Cloud cover 39).
The month with the least cloud cover is July (Cloud cover 25).
Average visibility in December
Port Royal, 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).
Port Royal, South Carolina, USA
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