Climate and Average Weather Year Round at Lancaster County Airport-Mc Whirter Field South Carolina, United States

At Lancaster County Airport-Mc Whirter Field, the summers are hot and muggy, the winters are very cold and wet, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 31°F to 90°F and is rarely below 18°F or above 97°F.

Based on the tourism score, the best times of year to visit Lancaster County Airport-Mc Whirter Field for warm-weather activities are from late April to mid June and from late August to mid October.

The hot season lasts for 3.6 months, from May 25 to September 13, with an average daily high temperature above 83°F. The hottest month of the year at Lancaster County Airport-Mc Whirter Field is July, with an average high of 90°F and low of 69°F.

The cold season lasts for 3.0 months, from November 26 to February 28, with an average daily high temperature below 60°F. The coldest month of the year at Lancaster County Airport-Mc Whirter Field is January, with an average low of 32°F and high of 53°F.

At Lancaster County Airport-Mc Whirter Field, 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 at Lancaster County Airport-Mc Whirter Field begins around August 2 and lasts for 3.7 months, ending around November 25.

The clearest month of the year at Lancaster County Airport-Mc Whirter Field is October, during which on average the sky is clear, mostly clear, or partly cloudy 65% of the time.

The cloudier part of the year begins around November 25 and lasts for 8.3 months, ending around August 2.

The cloudiest month of the year at Lancaster County Airport-Mc Whirter Field is January, during which on average the sky is overcast or mostly cloudy 50% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Lancaster County Airport-Mc Whirter Field varies throughout the year.

The wetter season lasts 3.2 months, from May 22 to August 28, with a greater than 31% chance of a given day being a wet day. The month with the most wet days at Lancaster County Airport-Mc Whirter Field is July, with an average of 12.9 days with at least 0.04 inches of precipitation.

The drier season lasts 8.8 months, from August 28 to May 22. The month with the fewest wet days at Lancaster County Airport-Mc Whirter Field is October, with an average of 6.3 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone at Lancaster County Airport-Mc Whirter Field is July, with an average of 12.9 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 44% on July 26.

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. Lancaster County Airport-Mc Whirter Field experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year at Lancaster County Airport-Mc Whirter Field. The month with the most rain at Lancaster County Airport-Mc Whirter Field is August, with an average rainfall of 3.6 inches.

The month with the least rain at Lancaster County Airport-Mc Whirter Field is May, with an average rainfall of 2.8 inches.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Lancaster County Airport-Mc Whirter Field experiences some seasonal variation in monthly snowfall.

The snowy period of the year lasts for 3.0 months, from December 7 to March 8, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow at Lancaster County Airport-Mc Whirter Field is January, with an average snowfall of 3.4 inches.

The snowless period of the year lasts for 9.0 months, from March 8 to December 7. The least snow falls around July 18, with an average total accumulation of 0.0 inches.

The length of the day at Lancaster County Airport-Mc Whirter Field varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 50 minutes of daylight; the longest day is June 20, with 14 hours, 29 minutes of daylight.

The earliest sunrise is at 6:09 AM on June 12, and the latest sunrise is 1 hour, 36 minutes later at 7:45 AM on November 2. The earliest sunset is at 5:12 PM on December 4, and the latest sunset is 3 hours, 29 minutes later at 8:40 PM on June 28.

Daylight saving time (DST) is observed at Lancaster County Airport-Mc Whirter Field during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

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

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.

Lancaster County Airport-Mc Whirter Field experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 4.9 months, from May 10 to October 7, during which time the comfort level is muggy, oppressive, or miserable at least 23% of the time. The month with the most muggy days at Lancaster County Airport-Mc Whirter Field is July, with 27.5 days that are muggy or worse.

The month with the fewest muggy days at Lancaster County Airport-Mc Whirter Field is February, with 0.1 days that are muggy or worse.

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 at Lancaster County Airport-Mc Whirter Field experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.7 months, from October 26 to May 17, with average wind speeds of more than 4.7 miles per hour. The windiest month of the year at Lancaster County Airport-Mc Whirter Field is March, with an average hourly wind speed of 5.7 miles per hour.

The calmer time of year lasts for 5.3 months, from May 17 to October 26. The calmest month of the year at Lancaster County Airport-Mc Whirter Field is August, with an average hourly wind speed of 3.8 miles per hour.

The predominant average hourly wind direction at Lancaster County Airport-Mc Whirter Field varies throughout the year.

The wind is most often from the north for 1.4 months, from February 2 to March 13 and for 3.5 months, from September 14 to December 29, with a peak percentage of 37% on October 14. The wind is most often from the south for 1.3 months, from March 13 to April 21; for 2.7 weeks, from May 9 to May 28; and for 2.3 weeks, from July 26 to August 11, with a peak percentage of 33% on April 17. The wind is most often from the west for 2.6 weeks, from April 21 to May 9; for 1.9 months, from May 28 to July 26; and for 1.1 months, from December 29 to February 2, with a peak percentage of 34% on July 13.

To characterize how pleasant the weather is at Lancaster County Airport-Mc Whirter Field 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 Lancaster County Airport-Mc Whirter Field for general outdoor tourist activities are from late April to mid June and from late August to mid October, with a peak score in the third week of September.

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 Lancaster County Airport-Mc Whirter Field for hot-weather activities is from early June to early September, with a peak score in the second week of August.

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.

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 at Lancaster County Airport-Mc Whirter Field typically lasts for 6.7 months (204 days), from around April 6 to around October 27, rarely starting before March 18 or after April 25, and rarely ending before October 10 or after November 15.

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 at Lancaster County Airport-Mc Whirter Field should appear around February 16, only rarely appearing before January 28 or after March 4.

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 4.3 months, from April 11 to August 21, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest month of the year at Lancaster County Airport-Mc Whirter Field is June, with an average of 6.7 kWh.

The darker period of the year lasts for 2.9 months, from November 10 to February 6, with an average daily incident shortwave energy per square meter below 3.4 kWh. The darkest month of the year at Lancaster County Airport-Mc Whirter Field is December, with an average of 2.6 kWh.

For the purposes of this report, the geographical coordinates of Lancaster County Airport-Mc Whirter Field are 34.719 deg latitude, -80.859 deg longitude, and 459 ft elevation.

The topography within 2 miles of Lancaster County Airport-Mc Whirter Field contains only modest variations in elevation, with a maximum elevation change of 217 feet and an average elevation above sea level of 478 feet. Within 10 miles also contains only modest variations in elevation (394 feet). Within 50 miles contains only modest variations in elevation (1,503 feet).

The area within 2 miles of Lancaster County Airport-Mc Whirter Field is covered by trees (77%) and artificial surfaces (14%), within 10 miles by trees (72%) and cropland (18%), and within 50 miles by trees (64%) and cropland (20%).