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.
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
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
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
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
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
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
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
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
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
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
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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
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.
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
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.
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.
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.
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
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
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
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%).
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).
Time zones for airports and weather stations are provided by AskGeo.com .