St. Simons Island, GA weather in December
December in St. Simons Island: cool, with some rain. Highs 64°F, lows 47°F, rain on about 8 days. It is one of the coolest months in St. Simons Island.
- Normal high
- 64°F
- Normal low
- 47°F
- Wet days
- 8
- 2.8 in total
- Muggy days
- 1
- dew point 65°F+
How December changes from start to finish
| December 1 | December 31 | |
|---|---|---|
| Normal high | 67°F | 62°F |
| Normal low | 50°F | 45°F |
| Chance of a wet day | 24% | 26% |
| Sunrise / sunset | 7:06 am / 5:22 pm | 7:23 am / 5:33 pm |
| Daylight | 10.3 h | 10.2 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical December day
- 6 am50°Fdew point 46°F
- 9 am53°Fdew point 48°F
- Noon60°Fdew point 48°F
- 3 pm61°Fdew point 48°F
- 6 pm57°Fdew point 49°F
- 9 pm54°Fdew point 49°F
NOAA hourly normals (local standard time) from Brunswick Malcolm Mckinnon Airport (1 mi away); average wind 7 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F10 of 31
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph0 of 31
- Hot dayshigh 90°F or more0 of 31
- Muggy daysdaily mean dew point 65°F or more1 of 31
- Wet daysat least 0.01 in of rain or melted snow8 of 31
- Notable rainat least 0.10 in5 of 31
- Freezing nightslow 32°F or below2 of 31
Average days per December, counted from daily records for each year 1991-2020.
Rain in December
Normal precipitation is 2.8 in; a dry December brings about 1.2 in and a wet one about 3.8 in (25th and 75th percentiles). About 2 days bring half an inch or more, and about 1 an inch or more.
How December varies from year to year
- Warmest December, 1991-20202015: average high 72°F
- Coolest December2000: average high 56°F
- Wettest December2018: 8.6 in
- Driest December2008: 0.5 in
- Highest reading81°F (December 1, 2019)
- Lowest reading23°F (December 31, 2000)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
December compared with November and January
| November | December | January | |
|---|---|---|---|
| Normal high | 71°F | 64°F | 62°F |
| Normal low | 53°F | 47°F | 44°F |
| Wet days | 7 | 8 | 8 |
| Comfortable days | 14 | 10 | 9 |
| Daylight | 10.6 h | 10.2 h | 10.4 h |
Highs change by -7°F from November and -2°F into January.
Nearby alternatives in December
- Warmer: Gainesville, FL117 mi · high 69°F · 7 wet days
- Cooler: Athens, GA226 mi · high 57°F · 10 wet days
How St. Simons Island ranks in December
- Normal high84th warmest of 378 cities; 1st of 8 in Georgia
- Wet days145th driest of 378
- Comfortable days76th most of 340
What to pack for St. Simons Island in December
- A rain jacket or umbrella – rain on about 8 days
Frost in December
The first fall frost typically comes around Dec 26; in 1 year in 10 it comes before Nov 30. All frost dates for St. Simons Island.
Heating and cooling
December has 302 heating degree days and 15 cooling degree days (base 65°F), 8% of the year's total heating and cooling demand.
Questions
How cold is St. Simons Island in December?
The normal high is 64°F and the normal low is 47°F. From 1991 to 2020 the coldest December reading was 23°F (most recently on December 31, 2000).
Does it rain a lot in St. Simons Island in December?
About 8 days in December have at least 0.01 in of precipitation, and the normal total is 2.8 in. The wettest December in 1991-2020 was in 2018 (8.6 in); the driest was in 2008 (0.5 in).
Is December a good time to visit St. Simons Island?
December ranks 8th of 12 months on our comfort score for St. Simons Island (56 out of 100). It has about 10 comfortable days. The best months are March, April and November.
Where the numbers come from
- Temperature, rain, frost dates and humidity and wind by hour: Brunswick Malcolm Mckinnon Airport (USW00013878), 1.2 mi N of the city center, 16 ft . NOAA normals and daily records, 1991-2020.
- Snowfall: Brunswick (USC00091340), 7.0 mi WNW of the city center, 13 ft . NOAA normals and daily records, 1991-2020.
- Snow depth: Sapelo Is (USC00097808), 19 mi NNE of the city center, 10 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Malcolm Mc Kinnon Airport (722137-13878), 1.2 mi N of the city center, 14 ft . Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).