Hilton Head Island Weather in December
December's weather can get brisk at Hilton Head Island, South Carolina. But most days during winter have mild temperatures.
This page gives detailed information on the typical December weather for Hilton Head Island. The temperature and rainfall numbers here are historical averages based on climate data gathered at Hilton Head Island. The humidity and sunshine measurements are averages from the Savannah / Hilton Head International Airport.
Temperature
| 62 °F | December average high | 16 °C |
| 43 °F | December average low | 6 °C |
In most years, Hilton Head Island averages a daily maximum temperature for December that's between 58 and 65 degrees Fahrenheit (14 to 19 degrees Celsius). The minimum temperature usually falls between 38 and 47 °F (3 to 8 °C).
The days at Hilton Head Island cool down further during December. By the end of the month, the temperature has dropped around 5 °F (3 °C) below what it was at the start.
| 18 days | 60 °F max. or more (16 °C) |
| 13 days | 40 °F min. or less (4 °C) |
Nearly every December day warms to over 50 °F (10 °C) at Hilton Head. The Island averages 6 days in December when the thermometer reaches into the 70s °F (over 21 °C). Temperatures above 80 °F (27 °C) occasionally occur this month.
The thermometer dips to 32 °F (0 °C) or below on an average of 4 nights. Only rarely does December get a night as cold as 20 °F (-8 °C).
Rain
| 3.1 in | total precipitation | 79 mm |
| 8 days | of rain |
Half the time, Hilton Head Island receives 1.5 to 5 inches (39 to 121 mm) of rainfall in December. One in four years has drier weather, while another one in four is wetter.
Sun
| 55 % | sunshine |
| 9 days | clear skies |
The sun's rays reach the ground in Hilton Head Island during 55 percent of daylight hours on average in December, for a total of 172 hours in the month. Typically on 9 days this month the sky is mainly clear, with at most 30 percent cloud cover.
Sunlight in December at the island town averages 10 hours and 4 minutes a day. The shortest days of the year, from around December 19th to 24th, last 10 hours and 2 minutes from sunrise to sunset.
Humidity
| 71 % | December average humidity |
The relative humidity in Hilton Head Island during December usually peaks at 83 percent in the morning then drops to 53 percent by late afternoon.
| Local Time | 1 am | 4 am | 7 am | 10 am | 1 pm | 4 pm | 7 pm | 10 pm |
| Humidity % | 79 | 82 | 83 | 70 | 54 | 53 | 69 | 77 |
Storms
| 2 days | rainfall of 0.5 inches (13 mm) or more |
Reference
These weather data are long-term historical averages provided by the National Climatic Data Center of the United States. The temperature and precipitation numbers are 1981-2010 normals while the humidity statistics are 1961-1990 normals.