Myrtle Beach Weather in December
Although December's weather can get chilly at Myrtle Beach, South Carolina, it can also get warm. The amount of sun and rainfall that occur now are similar to the rest of winter.
This page gives detailed information on the typical December temperature, precipitation, sun and humidity for Myrtle Beach. The temperature and rainfall numbers here are historical averages based on climate data gathered at Grand Strand Airport. The sunshine and humidity measurements are averages from Charleston International Airport.
Temperature
| 59 °F | December average high | 15 °C |
| 40 °F | December average low | 4 °C |
| 16 days | 60 °F max. or more (16 °C) |
| 9 days | 32 °F min. or less (0 °C) |
Nearly every December day warms to over 50 degrees Fahrenheit (10 degrees Celsius) at Myrtle Beach. The city averages 4 days in this month when the thermometer reaches into the 70s °F (over 21 °C). Temperatures above 80 °F (27 °C) rare not normal here during December.
Most years the thermometer does not dip below 20 °F (-8 °C) during December.
Precipitation
| 3.1 in | total precipitation | 79 mm |
| 10 days | of rain or snow |
Half the time, Myrtle Beach receives 2.2 to 3.3 inches (56 to 84 mm) of rainfall in December. One in four years has drier weather, while another one in four is wetter.
Sun
| 56 % | sunshine |
| 9 days | clear skies |
The sun's rays reach the ground in Myrtle Beach during 56 percent of daylight hours on average in December, for a total of 173 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 this holiday destination averages 9 hours and 57 minutes a day. The shortest days of the year, from around December 17th to 25th, last 9 hours and 55 minutes from sunrise to sunset.
Humidity
| 72 % | December average humidity |
The relative humidity in Myrtle Beach during December usually peaks at 82 percent in the morning then drops to 55 percent by late afternoon.
| Local Time | 1 am | 4 am | 7 am | 10 am | 1 pm | 4 pm | 7 pm | 10 pm |
| Humidity % | 80 | 82 | 82 | 69 | 55 | 55 | 71 | 78 |
Reference
The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals.