Average Weather In March For Charleston, South Carolina, USA

Location

This report describes the typical weather at the Charleston International Airport (Charleston Air Force Base) (Charleston, South Carolina, United States) weather station over the course of an average March. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.

Charleston, South Carolina has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by forests (63%), oceans and seas (16%), croplands (12%), lakes and rivers (4%), and built-up areas (3%).

Temperature

The month of March is characterized by rising daily high temperatures, with daily highs increasing from 66°F to 72°F over the course of the month, exceeding 82°F or dropping below 54°F only one day in ten.

Daily High and Low Temperature in March

The daily average low (blue) and high (red) temperature with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).
Daily low temperatures range from 45°F to 51°F, falling below 33°F or exceeding 62°F only one day in ten.

Fraction of Time Spent in Various Temperature Bands in March

The average fraction of time spent in various temperature bands: frigid (below 15°F), freezing (15°F to 32°F), cold (32°F to 50°F), cool (50°F to 65°F), comfortable (65°F to 75°F), warm (75°F to 85°F), hot (85°F to 100°F) and sweltering (above 100°F).

Sun

Over the course of March, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 1:02 hours, implying an average day-over-day increase of 2.0 minutes.

The shortest day of the month is March 1 with 11:30 hours of daylight; the longest day is March 31 with 12:31 hours of daylight.

Daily Hours of Daylight and Twilight in March

The number of hours during which the Sun is visible (black line), with various degrees of daylight, twilight, and night, indicated by the color bands. From bottom (most yellow) to top (most gray): full daylight, solar twilight (Sun is visible but less than 6° from the horizon), civil twilight (Sun is not visible but is less than 6° below the horizon), nautical twilight (Sun is between 6° and 12° below the horizon), astronomical twilight (Sun is between 12° and 18° below the horizon), and full night.

The earliest sunrise is at 6:36am on March 10; the latest sunset is at 7:40pm on March 31; the latest sunrise is at 7:35am on March 11; the earliest sunset is at 6:18pm on March 1.

Daylight savings time (DST) starts at 3:00am on March 11, 2012, shifting sunrise and sunset to an hour later.

Daily Sunrise & Sunset with Twilight and Daylight Savings Time in March

The solar day over the course of the year 2012 . From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (solar, civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight savings time are indicated by the "DST" labels.

Clouds

The median cloud cover ranges from 39% (mostly clear) to 50% (partly cloudy). The trend is for the sky to be clearing with the median cloud cover decreasing by 10% from the start to the end of the month.

Median Cloud Cover in March

The median daily cloud cover (black line) with percentile bands (inner band from 40th to 60th percentile, outer band from 25th to 75th percentile).

On March 30, the clearest day of the month, the sky is clear, mostly clear, or partly cloudy 64% of the time, and overcast or mostly cloudy 35% of the time.

On March 1, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 52% of the time, and clear or mostly clear 47% of the time.

Cloud Cover Types in March

The fraction of time spent in each of the five sky cover categories. From top (most blue) to bottom (most gray), the categories are clear, mostly clear, partly cloudy, mostly cloudy, and overcast. Pink indicates missing data. Outside of the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data.

Precipitation

The average probability that some form of precipitation will be observed in a given day is 35%, with little variation over the course of the month.

Probability of Precipitation at Some Point in the Day in March

The fraction of days in which various types of precipitation are observed. If more than one type of precipitation is reported in a given day, the more severe precipitation is counted. For example, if light rain is observed in the same day as a thunderstorm, that day counts towards the thunderstorm totals. The order of severity is from the top down in this graph, with the most severe at the bottom.

Throughout March, the most common forms of precipitation are light rain, moderate rain, and thunderstorms.

Light rain is the most severe precipitation observed during 40% of those days with precipitation. It is most likely around March 2, when it is observed during 15% of all days.

Moderate rain is the most severe precipitation observed during 34% of those days with precipitation. It is most likely around March 1, when it is observed during 13% of all days.

Thunderstorms are the most severe precipitation observed during 17% of those days with precipitation. They are most likely around March 31, when it is observed during 8% of all days.

Types of Precipitation Throughout March

Relative frequency of various types of precipitation over the course of a typical March.

Snow

Either snow is exceptionally unlikely to fall at this location in March or this station does not reliably report precipitation types.

Humidity

The relative humidity typically ranges from 41% (comfortable) to 91% (very humid) over the course of a typical March, rarely dropping below 22% (dry) and reaching as high as 100% (very humid).

The air is driest around March 5, at which time the relative humidity drops below 53% (mildly humid) three days out of four; it is most humid around March 22, rising above 86% (very humid) three days out of four.

Relative Humidity in March

The average daily high (blue) and low (brown) relative humidity with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

Dew Point

Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.

Over the course of a typical March, the dew point typically varies from 35°F (dry) to 56°F (comfortable) and is rarely below 18°F (dry) or above 65°F (mildy humid).

The time of the month between March 2 and March 31 is the most comfortable, with dew points that are neither too dry nor too muggy.

Dew Point in March

The daily average low (blue) and high (red) dew point with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

Wind

Over the course of March typical wind speeds vary from 2 mph to 17 mph (light air to moderate breeze), rarely exceeding 23 mph (fresh breeze).

The highest average wind speed of 9 mph (gentle breeze) occurs around March 29, at which time the average daily maximum wind speed is 17 mph (moderate breeze).

The lowest average wind speed of 9 mph (gentle breeze) occurs around March 17, at which time the average daily maximum wind speed is 16 mph (moderate breeze).

Wind Speed in March

The average daily minimum (red), maximum (green), and average (black) wind speed with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).
The wind is most often out of the south (16% of the time), north (14% of the time), south west (13% of the time), north east (13% of the time), and west (13% of the time).

Wind Directions in March

The fraction of time spent with the wind blowing from the various directions over the entire year. Values do not sum to 100% because the wind direction is undefined when the wind speed is zero.

Fraction of Time Spent with Various Wind Directions in March

The fraction of time spent with the wind blowing from the various directions on a daily basis. Stacked values do not always sum to 100% because the wind direction is undefined when the wind speed is zero.