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Average Weather in Holly Hill South Carolina, United States

In Holly Hill, the summers are hot and oppressive, the winters are short and cold, and it is wet and partly cloudy year round. Over the course of the year, the temperature typically varies from 38°F to 91°F and is rarely below 25°F or above 97°F.

Based on the tourism score, the best times of year to visit Holly Hill for warm-weather activities are from mid April to early June and from early September to late October.

Climate Summary

coolcomfortablewarmhotwarmcomfortablecoolJanFebMarAprMayJunJulAugSepOctNovDecNowNow66%66%48%48%clearovercastprecipitation: 4.6 inprecipitation: 4.6 in2.3 in2.3 inmuggy: 96%muggy: 96%0%0%drydrytourism score: 6.2tourism score: 6.21.91.9
Click on each chart for more information.

Temperature

The hot season lasts for 3.7 months, from May 23 to September 15, with an average daily high temperature above 84°F. The hottest day of the year is July 19, with an average high of 91°F and low of 72°F.

The cool season lasts for 2.9 months, from November 29 to February 26, with an average daily high temperature below 64°F. The coldest day of the year is January 17, with an average low of 38°F and high of 57°F.

Average High and Low Temperature

Average High and Low Temperature in Holly HillhotcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 1757°FJan 1757°FJul 1991°FJul 1991°F38°F38°F72°F72°FMay 2384°FMay 2384°FSep 1584°FSep 1584°FNov 2964°FNov 2964°FFeb 2664°FFeb 2664°F63°F63°F66°F66°F43°F43°F42°F42°FNowNow
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 entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

Average Hourly Temperature in Holly HillJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowvery coldcoldcoldcoldcoldcoolcoolcomfortablewarmhotwarmvery coldvery cold
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.

Matmata, Tunisia (5,022 miles away) is the far-away foreign place with temperatures most similar to Holly Hill (view comparison).

Clouds

In Holly Hill, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year in Holly Hill begins around August 30 and lasts for 2.9 months, ending around November 28. On October 27, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 66% of the time, and overcast or mostly cloudy 34% of the time.

The cloudier part of the year begins around November 28 and lasts for 9.1 months, ending around August 30. On July 13, the cloudiest day of the year, the sky is overcast or mostly cloudy 52% of the time, and clear, mostly clear, or partly cloudy 48% of the time.

Cloud Cover Categories

Cloud Cover Categories in Holly HillclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 2766%Oct 2766%Jul 1348%Jul 1348%Aug 3057%Aug 3057%Nov 2857%Nov 2857%NowNowclearpartly cloudymostly cloudyovercastmostly clear
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.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Holly Hill varies significantly throughout the year.

The wetter season lasts 3.5 months, from May 28 to September 13, with a greater than 35% chance of a given day being a wet day. The chance of a wet day peaks at 52% on August 5.

The drier season lasts 8.5 months, from September 13 to May 28. The smallest chance of a wet day is 18% on October 30.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 52% on August 5.

Daily Chance of Precipitation

Daily Chance of Precipitation in Holly HillwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Aug 552%Aug 552%Oct 3018%Oct 3018%Jan 125%Jan 125%May 2835%May 2835%Sep 1335%Sep 1335%NowNowrainmixed
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 months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Holly Hill experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Holly Hill. The most rain falls during the 31 days centered around August 14, with an average total accumulation of 4.6 inches.

The least rain falls around November 9, with an average total accumulation of 2.3 inches.

Average Monthly Rainfall

Average Monthly Rainfall in Holly HillJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 inAug 144.6 inAug 144.6 inNov 92.3 inNov 92.3 inMar 13.5 inMar 13.5 inMay 12.6 inMay 12.6 inNowNow
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 liquid-equivalent snowfall.

Sun

The length of the day in Holly Hill varies significantly over the course of the year. In 2021, the shortest day is December 21, with 9 hours, 57 minutes of daylight; the longest day is June 20, with 14 hours, 22 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in Holly HillJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 6 minMar 2012 hr, 6 minMar 2014 hr, 22 minJun 2014 hr, 22 minJun 2012 hr, 8 minSep 2212 hr, 8 minSep 229 hr, 57 minDec 219 hr, 57 minDec 21nightnightday
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 is at 6:11 AM on June 11, and the latest sunrise is 1 hour, 33 minutes later at 7:44 AM on November 6. The earliest sunset is at 5:13 PM on December 4, and the latest sunset is 3 hours, 21 minutes later at 8:35 PM on June 29.

Daylight saving time (DST) is observed in Holly Hill during 2021, starting in the spring on March 14, lasting 7.8 months, and ending in the fall on November 7.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time in Holly HillJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 116:11 AMJun 116:11 AM8:35 PMJun 298:35 PMJun 29Dec 45:13 PMDec 45:13 PM7:44 AMNov 67:44 AMNov 6Mar 14DSTMar 14DSTDSTNov 7DSTNov 7daynightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2021. 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 transitions to and from daylight saving time are indicated by the 'DST' labels.

Moon

The figure below presents a compact representation of key lunar data for 2021. 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.

Moon Rise, Set & Phases

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.

Humidity

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.

Holly Hill experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 5.2 months, from May 9 to October 16, during which time the comfort level is muggy, oppressive, or miserable at least 24% of the time. The muggiest day of the year is July 23, with muggy conditions 96% of the time.

The least muggy day of the year is February 5, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels in Holly HillmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 50%Feb 50%96%Jul 2396%Jul 23May 924%May 924%Oct 1624%Oct 1624%NowNowmiserablemiserableoppressiveoppressivedrydryhumidhumidmuggymuggy
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.

Wind

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 Holly Hill experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.4 months, from November 4 to May 18, with average wind speeds of more than 6.7 miles per hour. The windiest day of the year is March 9, with an average hourly wind speed of 8.0 miles per hour.

The calmer time of year lasts for 5.6 months, from May 18 to November 4. The calmest day of the year is August 9, with an average hourly wind speed of 5.4 miles per hour.

Average Wind Speed

Average Wind Speed in Holly HillwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mphMar 98.0 mphMar 98.0 mphAug 95.4 mphAug 95.4 mphNov 46.7 mphNov 46.7 mphMay 186.7 mphMay 186.7 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Holly Hill varies throughout the year.

The wind is most often from the west for 2.6 months, from January 2 to March 20, with a peak percentage of 35% on January 14. The wind is most often from the south for 5.1 months, from March 20 to August 23, with a peak percentage of 45% on July 14. The wind is most often from the north for 3.2 months, from September 28 to January 2, with a peak percentage of 32% on January 1.

Wind Direction

Wind Direction in Holly HillWSENJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsouthnortheast
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).

Water Temperature

Holly Hill 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 water temperature experiences significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.4 months, from June 14 to September 26, with an average temperature above 79°F. The day of the year with the warmest water is August 4, with an average temperature of 83°F.

The time of year with cooler water lasts for 4.3 months, from December 11 to April 19, with an average temperature below 67°F. The day of the year with the coolest water is March 8, with an average temperature of 63°F.

Average Water Temperature

Average Water Temperature in Holly HillwarmcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°FAug 483°FAug 483°F63°FMar 863°FMar 8Jun 1479°FJun 1479°FSep 2679°FSep 2679°FDec 1167°FDec 1167°FApr 1967°FApr 1967°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

To characterize how pleasant the weather is in Holly Hill throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best times of year to visit Holly Hill for general outdoor tourist activities are from mid April to early June and from early September to late October, with a peak score in the second week of May.

Tourism Score

Tourism Score in Holly Hillbest timebest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.26.21.91.96.26.24.34.3NowNowprecipitationprecipitationcloudscloudstemperaturetemperature tourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Holly Hill for hot-weather activities is from late May to late September, with a peak score in the first week of September.

Beach/Pool Score

Beach/Pool Score in Holly Hillbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810105.75.70.30.35.65.65.25.2NowNowprecipitationprecipitationcloudscloudstemperaturetemperature beach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Growing Season

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 Holly Hill typically lasts for 8.2 months (252 days), from around March 13 to around November 19, rarely starting before February 18 or after April 5, and rarely ending before October 31 or after December 12.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Holly Hillgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Mar 1350%Mar 1350%Nov 1950%Nov 1990%Apr 590%Apr 590%Oct 3190%Oct 3110%Feb 1810%Feb 1810%Dec 1210%Dec 120%Jan 220%Jan 22Jul 24100%Jul 24100%NowNowvery coldcoldcoolcomfortablewarmhot
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.

Based on growing degree days alone, the first spring blooms in Holly Hill should appear around January 29, only rarely appearing before January 16 or after February 15.

Growing Degree Days

Growing Degree Days in Holly HillJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F1,000°F1,000°F2,000°F2,000°F3,000°F3,000°F4,000°F4,000°F5,000°F5,000°F6,000°F6,000°FJan 2989°FJan 2989°FApr 30900°FApr 30900°FJun 101,800°FJun 101,800°FDec 315,674°FDec 315,674°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 experiences significant seasonal variation over the course of the year.

The brighter period of the year lasts for 3.5 months, from April 8 to July 25, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest day of the year is May 19, with an average of 6.7 kWh.

The darker period of the year lasts for 2.8 months, from November 12 to February 5, with an average daily incident shortwave energy per square meter below 3.5 kWh. The darkest day of the year is December 21, with an average of 2.7 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in Holly HillbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhMay 196.7 kWhMay 196.7 kWhDec 212.7 kWhDec 212.7 kWhApr 85.9 kWhApr 85.9 kWhJul 255.9 kWhJul 255.9 kWhFeb 53.5 kWhFeb 53.5 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Holly Hill are 33.323 deg latitude, -80.414 deg longitude, and 102 ft elevation.

The topography within 2 miles of Holly Hill is essentially flat, with a maximum elevation change of 36 feet and an average elevation above sea level of 97 feet. Within 10 miles is essentially flat (157 feet). Within 50 miles contains only modest variations in elevation (509 feet).

The area within 2 miles of Holly Hill is covered by trees (61%), artificial surfaces (20%), and cropland (15%), within 10 miles by trees (50%) and cropland (26%), and within 50 miles by trees (49%) and cropland (21%).

Data Sources

This report illustrates the typical weather in Holly Hill, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Holly Hill.

For each station, the records are corrected for the elevation difference between that station and Holly Hill 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 Holly Hill is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Holly Hill and a given station.

The stations contributing to this reconstruction are: Summerville Airport (31%, 32 kilometers, southeast); Santee Cooper Regional Airport (27%, 35 kilometers, northeast); Berkeley County Airport (23%, 39 kilometers, southeast); and Orangeburg Municipal Airport (19%, 44 kilometers, west).

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 © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

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.