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December Weather in Hilton Head Island South Carolina, United States

Daily high temperatures decrease by 5°F, from 65°F to 60°F, rarely falling below 47°F or exceeding 75°F.

Daily low temperatures decrease by 5°F, from 49°F to 44°F, rarely falling below 31°F or exceeding 62°F.

For reference, on July 22, the hottest day of the year, temperatures in Hilton Head Island typically range from 76°F to 89°F, while on January 17, the coldest day of the year, they range from 42°F to 59°F.

Average High and Low Temperature in December in Hilton Head Island

Average High and Low Temperature in December in Hilton Head IslandDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313130°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°FNovJanDec 165°FDec 165°F49°F49°FDec 3160°FDec 3160°F44°F44°FDec 1162°FDec 1162°F46°F46°FDec 2161°FDec 2161°F45°F45°F
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in December in Hilton Head Island

Average Hourly Temperature in December in Hilton Head IslandDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNovJancoldcoldcoolcomfortable
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Uzunbağ, Turkey (6,200 miles away) and Kuai’an, China (8,209 miles) are the far-away foreign places with temperatures most similar to Hilton Head Island (view comparison).

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The month of December in Hilton Head Island experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 42% to 47%.

The clearest day of the month is December 4, with clear, mostly clear, or partly cloudy conditions 58% of the time.

For reference, on July 11, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on October 26, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 65%.

Cloud Cover Categories in December in Hilton Head Island

Cloud Cover Categories in December in Hilton Head IslandDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJanDec 158%Dec 158%Dec 3153%Dec 3153%Dec 1155%Dec 1155%Dec 2154%Dec 2154%clearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Hilton Head Island, the chance of a wet day over the course of December is essentially constant, remaining around 23% throughout.

For reference, the year's highest daily chance of a wet day is 53% on August 6, and its lowest chance is 17% on October 29.

Probability of Precipitation in December in Hilton Head Island

The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during December in Hilton Head Island is gradually increasing, starting the month at 2.4 inches, when it rarely exceeds 4.8 inches or falls below 0.6 inches, and ending the month at 2.8 inches, when it rarely exceeds 5.4 inches or falls below 0.9 inches.

Average Monthly Rainfall in December in Hilton Head Island

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.

Over the course of December in Hilton Head Island, the length of the day is essentially constant. The shortest day of the month is December 20, with 10 hours, 2 minutes of daylight and the longest day is December 1, with 10 hours, 11 minutes of daylight.

Hours of Daylight and Twilight in December in Hilton Head Island

Hours of Daylight and Twilight in December in Hilton Head IslandDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrNovJanDec 2110 hr, 2 minDec 2110 hr, 2 minnightnightdaydayDec 110 hr, 11 minDec 110 hr, 11 min
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise of the month in Hilton Head Island is 7:06 AM on December 1 and the latest sunrise is 17 minutes later at 7:23 AM on December 31.

The earliest sunset is 5:17 PM on December 3 and the latest sunset is 11 minutes later at 5:28 PM on December 31.

Daylight saving time is observed in Hilton Head Island during 2024, but it neither starts nor ends during December, so the entire month is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 6:16 AM and sets 14 hours, 16 minutes later, at 8:32 PM, while on December 21, the shortest day of the year, it rises at 7:20 AM and sets 10 hours, 2 minutes later, at 5:22 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in December in Hilton Head Island

Sunrise & Sunset with Twilight and Daylight Saving Time in December in Hilton Head IslandDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031312 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMNovJan7:06 AM7:06 AMDec 15:17 PMDec 15:17 PM7:23 AM7:23 AMDec 315:28 PMDec 315:28 PM7:14 AM7:14 AMDec 115:18 PMDec 115:18 PM7:20 AM7:20 AMDec 215:22 PMDec 215:22 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of December. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in December in Hilton Head Island

Solar Elevation and Azimuth in December in Hilton Head IslandDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNovJan0010102020303000101020203030
northeastsouthwest
Solar elevation and azimuth over the course of December 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for December 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in December in Hilton Head Island

Moon Rise, Set & Phases in December in Hilton Head IslandDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNovJanNov 18:48 AMNov 18:48 AMNov 154:29 PMNov 154:29 PMDec 11:22 AMDec 11:22 AMDec 154:02 AMDec 154:02 AMDec 305:28 PMDec 305:28 PMJan 135:28 PMJan 135:28 PMJan 297:37 AMJan 297:37 AM7:45 AM7:45 AM6:29 PM6:29 PM5:04 PM5:04 PM7:49 AM7:49 AM7:37 AM7:37 AM5:26 PM5:26 PM4:31 PM4:31 PM7:46 AM7:46 AM7:23 AM7:23 AM5:08 PM5:08 PM5:24 PM5:24 PM8:12 AM8:12 AM7:37 AM7:37 AM6:12 PM6:12 PM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.
Dec 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
0%7:37 AMESE5:26 PMWSW-12:31 PMS245,337 mi
2
2%8:36 AMSE6:19 PMSW-1:27 PMS243,253 mi
3
7%9:32 AMSE7:18 PMWSW-2:25 PMS241,120 mi
4
13%10:21 AMESE8:23 PMWSW-3:22 PMS238,973 mi
5
21%11:04 AMESE9:29 PMWSW-4:17 PMS236,833 mi
6
31%11:41 AMESE10:35 PMWSW-5:08 PMS234,717 mi
7
42%12:14 PMESE11:41 PMW-5:57 PMS232,662 mi
8
50%12:45 PME--6:44 PMS230,741 mi
9
66%-12:47 AMW1:14 PME7:31 PMS229,069 mi
10
77%-1:53 AMW1:44 PME8:19 PMS227,799 mi
11
86%-3:01 AMWNW2:17 PMENE9:10 PMS227,106 mi
12
93%-4:11 AMWNW2:55 PMENE10:05 PMS227,150 mi
13
98%-5:24 AMWNW3:39 PMENE11:05 PMS228,042 mi
14
99%-6:37 AMWNW4:31 PMENE--
15
100%-7:46 AMNW5:31 PMNE12:07 AMS229,803 mi
16
99%-8:46 AMWNW6:36 PMENE1:10 AMS232,338 mi
17
95%-9:37 AMWNW7:43 PMENE2:10 AMS235,448 mi
18
90%-10:19 AMWNW8:48 PMENE3:05 AMS238,860 mi
19
82%-10:54 AMWNW9:50 PMENE3:54 AMS242,275 mi
20
74%-11:23 AMWNW10:48 PME4:39 AMS245,412 mi
21
64%-11:50 AMW11:44 PME5:21 AMS248,032 mi
22
50%-12:14 PMW-6:00 AMS249,952 mi
23
45%12:38 AME12:38 PMW-6:39 AMS251,062 mi
24
35%1:32 AME1:03 PMWSW-7:18 AMS251,319 mi
25
26%2:27 AMESE1:30 PMWSW-7:59 AMS250,750 mi
26
18%3:24 AMESE2:00 PMWSW-8:42 AMS249,443 mi
27
11%4:24 AMESE2:36 PMWSW-9:30 AMS247,540 mi
28
6%5:25 AMESE3:19 PMWSW-10:21 AMS245,218 mi
29
2%6:25 AMESE4:09 PMSW-11:17 AMS242,679 mi
30
0%7:23 AMSE5:08 PMWSW-12:16 PMS240,121 mi
31
1%8:16 AMESE6:12 PMWSW-1:14 PMS237,718 mi

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in Hilton Head Island is decreasing during December, falling from 10% to 4% over the course of the month.

For reference, on July 19, the muggiest day of the year, there are muggy conditions 99% of the time, while on January 30, the least muggy day of the year, there are muggy conditions 2% of the time.

Humidity Comfort Levels in December in Hilton Head Island

Humidity Comfort Levels in December in Hilton Head IslandDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%NovJanDec 110%Dec 110%Dec 314%Dec 314%Dec 118%Dec 118%Dec 215%Dec 215%muggymuggyhumidhumidcomfortablecomfortabledrydryoppressiveoppressive
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Hilton Head Island is essentially constant during December, remaining within 0.2 miles per hour of 11.3 miles per hour throughout.

For reference, on January 29, the windiest day of the year, the daily average wind speed is 12.0 miles per hour, while on August 16, the calmest day of the year, the daily average wind speed is 9.1 miles per hour.

Average Wind Speed in December in Hilton Head Island

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The wind direction in Hilton Head Island during December is predominantly out of the north from December 1 to December 30 and the west from December 30 to December 31.

Wind Direction in December in Hilton Head Island

Wind Direction in December in Hilton Head IslandNWDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%NovJanwestsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Hilton Head Island is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature in Hilton Head Island is gradually decreasing during December, falling by 2°F, from 67°F to 65°F, over the course of the month.

Average Water Temperature in December in Hilton Head Island

Average Water Temperature in December in Hilton Head IslandDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313156°F56°F58°F58°F60°F60°F62°F62°F64°F64°F66°F66°F68°F68°F70°F70°F72°F72°F74°F74°F76°F76°FNovJanDec 167°FDec 167°FDec 3165°FDec 3165°FDec 1166°FDec 1166°FDec 2165°FDec 2165°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Hilton Head Island typically lasts for 10 months (307 days), from around February 14 to around December 17, rarely starting before January 23 or after March 11, and rarely ending before November 23 or after January 7.

The month of December in Hilton Head Island is very likely fully outside of the growing season, with the chance that a given day is in the growing season very rapidly decreasing from 79% to 20% over the course of the month.

Time Spent in Various Temperature Bands and the Growing Season in December in Hilton Head Island

Time Spent in Various Temperature Bands and the Growing Season in December in Hilton Head Islandgrowing seasonDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJan79%Dec 179%Dec 1Dec 3120%Dec 3120%62%Dec 1162%Dec 11Dec 2139%Dec 2139%90%Nov 2390%Nov 23very coldcoldcoolcomfortablewarmfreezing
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Hilton Head Island are increasing during December, increasing by 187°F, from 6,257°F to 6,444°F, over the course of the month.

Growing Degree Days in December in Hilton Head Island

Growing Degree Days in December in Hilton Head IslandDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031316,000°F6,000°F6,100°F6,100°F6,200°F6,200°F6,300°F6,300°F6,400°F6,400°F6,500°F6,500°F6,600°F6,600°F6,700°F6,700°F6,800°F6,800°FNovJanDec 16,257°FDec 16,257°FDec 316,444°FDec 316,444°FDec 116,329°FDec 116,329°FDec 216,390°FDec 216,390°F
The average growing degree days accumulated over the course of December, with 25th to 75th and 10th to 90th percentile bands.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in Hilton Head Island is essentially constant during December, remaining within 0.1 kWh of 3.0 kWh throughout.

The lowest average daily incident shortwave solar energy during December is 2.8 kWh on December 20.

Average Daily Incident Shortwave Solar Energy in December in Hilton Head Island

Average Daily Incident Shortwave Solar Energy in December in Hilton Head IslandDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 kWh0.0 kWh0.5 kWh0.5 kWh1.0 kWh1.0 kWh1.5 kWh1.5 kWh2.0 kWh2.0 kWh2.5 kWh2.5 kWh3.0 kWh3.0 kWh3.5 kWh3.5 kWh4.0 kWh4.0 kWh4.5 kWh4.5 kWh5.0 kWh5.0 kWhNovJanDec 202.8 kWhDec 202.8 kWhDec 13.1 kWhDec 13.1 kWhDec 312.9 kWhDec 312.9 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of Hilton Head Island are 32.194 deg latitude, -80.738 deg longitude, and 10 ft elevation.

The topography within 2 miles of Hilton Head Island is essentially flat, with a maximum elevation change of 16 feet and an average elevation above sea level of 7 feet. Within 10 miles is also essentially flat (33 feet). Within 50 miles is essentially flat (302 feet).

The area within 2 miles of Hilton Head Island is covered by herbaceous vegetation (67%), artificial surfaces (13%), and water (12%), within 10 miles by water (64%) and herbaceous vegetation (25%), and within 50 miles by water (50%) and trees (24%).

This report illustrates the typical weather in Hilton Head Island, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Hilton Head Island.

For each station, the records are corrected for the elevation difference between that station and Hilton Head Island according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Hilton Head Island is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Hilton Head Island and a given station.

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Hilton Head Island and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

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