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
December signifies a minor drop in average high-temperature, transitioning from 66.9°F (19.4°C) in November to a still enjoyable 61.3°F (16.3°C). An average low-temperature of 49.1°F (9.5°C) is expected in Port Royal during December.Humidity
December is the most humid month, with an average relative humidity of 77%.Rainfall
In Port Royal, South Carolina, 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
January, February and December are months with snowfall. December is the first month it typically snows. Throughout December, there are 0.1 snowfall days. In Port Royal, during the entire year, snow falls for 0.4 days.Daylight
With an average of 10h and 6min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:06 am and sunset at 5:17 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 5:28 pm EST.
Sunshine
December has the least sunshine of the year in Port Royal, with an average of 5.6h of sunshine.UV index
In December, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In December, a regular UV index of 4 translates into these guidelines:
Make use of precautions - Suggestions to resist sunburn are communicated. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Frequently asked questions
What are December temperatures in Port Royal?
What is the most humid month in Port Royal?
What is the average humidity in December in Port Royal?
How much does it rain in Port Royal in December?
When does it start to snow in Port Royal?
What is the month with the shortest days in Port Royal?
What is the average length of the day in December in Port Royal?
What time are sunrise and sunset in December in Port Royal?
What is the month with the least sunshine in Port Royal?
How many hours of sunshine does Port Royal have in December?
How high is the UV index in December in Port Royal?
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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