Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
January is the coldest month, with the temperature often reaching an average high of 57°F (13.9°C) and an average low of 45.5°F (7.5°C).Humidity
January and March, with an average relative humidity of 73%, are the least humid months.Rainfall
The month with the least rainfall is January, when the rain falls for 9.7 days and typically collects 1.42" (36mm) of precipitation.Snowfall
January and February are months with snowfall. The month with the most snowfall days is January, when snow falls for 0.3 days.Daylight
In January, the average length of the day is 10h and 17min.On the first day of the month, sunrise is at 7:21 am and sunset at 5:23 pm. On the last day of January, in Sullivan's Island, sunrise is at 7:14 am and sunset at 5:50 pm EST.
Sunshine
In Sullivan's Island, South Carolina, the average sunshine in January is 5.8h.UV index
With an average maximum UV index of 3, January is the month with the lowest UV index. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The daily high UV index of 3 during January translates into the following recommendations:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. 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
What time of the year is the coldest in Sullivan's Island?
What are January temperatures?
What are the least humid months?
What is the average humidity in January in Sullivan's Island?
What is the driest month in Sullivan's Island?
How much does it rain in January?
What is the snowiest month?
When does it start to snow?
What is the average length of the day in January in Sullivan's Island?
When is the sunrise / sunset in January?
How long on average sun shines in January?
What is the month with the lowest UV index?
What is the UV index intensity in January?
Average temperature in January
Sullivan's Island, SC
- Average high temperature in January: 57°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (57°F).
- Average low temperature in January: 45.5°F
The month with the highest average low temperature is July (78.3°F).
The coldest month (with the lowest average low temperature) is January (45.5°F).
Average pressure in January
Sullivan's Island, SC
- Average pressure in January: 30.14"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed in January
Sullivan's Island, SC
- Average wind speed in January: 10mph
The windiest months (with the highest average wind speed) are March and April (10.3mph).
The calmest month (with the lowest average wind speed) is August (8.4mph).
Average humidity in January
Sullivan's Island, SC
- Average humidity in January: 73%
The month with the highest relative humidity is December (78%).
The months with the lowest relative humidity are January and March (73%).
Average rainfall in January
Sullivan's Island, SC
- Average rainfall in January: 1.42"
The wettest month (with the highest rainfall) is August (8.23").
The driest month (with the least rainfall) is January (1.42").
Average rainfall days in January
Sullivan's Island, SC
- Average rainfall days in January: 9.7 days
The month with the highest number of rainy days is August (25.9 days).
The month with the least rainy days is November (8.5 days).
Average snowfall days in January
Sullivan's Island, SC
- Average snowfall days in January: 0.3 days
The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in January /
Average sunshine in January
Sullivan's Island, SC
- Average daylight in January: 10h and 2min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in January: 5h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in January
Sullivan's Island, SC
- Average sunshine days in January: 19.3 days
The month with the most sunshine days is January (19.3 days).
The month with the least sunshine days is August (2.8 days).
Average UV index in January
Sullivan's Island, SC
- Average UV index in January: 3
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 January
Sullivan's Island, SC
- Average cloud cover in January: 34
The month with the most cloud cover is December (Cloud cover 39).
The month with the least cloud cover is June (Cloud cover 25).
Average visibility in January
Sullivan's Island, SC
- Average visibility in January: 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).
Sullivan's Island, South Carolina, USA
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