This report describes the typical weather at the Raleigh-Durham International Airport (Raleigh, North 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.
Raleigh, North 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 (74%), croplands (16%), built-up areas (6%), and lakes and rivers (5%).
The month of March is characterized by rising daily high temperatures, with daily highs increasing from 58°F to 67°F over the course of the month, exceeding 79°F or dropping below 44°F only one day in ten.
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 1:08 hours, implying an average day-over-day increase of 2.2 minutes.
The shortest day of the month is March 1 with 11:26 hours of daylight; the longest day is March 31 with 12:34 hours of daylight.
The earliest sunrise is at 6:32am on March 10; the latest sunset is at 7:37pm on March 31; the latest sunrise is at 7:31am on March 11; the earliest sunset is at 6:11pm on March 1.
Daylight savings time (DST) starts at 3:00am on March 11, 2012, shifting sunrise and sunset to an hour later.
The median cloud cover ranges from 66% (partly cloudy) to 72% (partly cloudy). The trend is for the sky to be clearing with the median cloud cover decreasing by 5% from the start to the end of the month.
On March 16, a representative day, the sky is clear or mostly clear 37% of the time, partly cloudy 14% of the time, and mostly cloudy or overcast 48% of the time.
The average probability that some form of precipitation will be observed in a given day is 42%, with little variation over the course of the month.
Throughout March, the most common forms of precipitation are moderate rain, light rain, and thunderstorms.
Moderate rain is the most severe precipitation observed during 35% of those days with precipitation. It is most likely around March 16, when it is observed during 15% of all days.
Light rain is the most severe precipitation observed during 34% of those days with precipitation. It is most likely around March 31, when it is observed during 15% of all days.
Thunderstorms are the most severe precipitation observed during 14% of those days with precipitation. They are most likely around March 31, when it is observed during 8% of all days.
The likelihood of snow falling is highest around March 1, occurring in 7% of days.
Accumulation at this location in March is extremely unlikely. The chances of there being snow on the ground are highest around March 1, occurring 5% of the time.
The snow is typically at its deepest on March 2, with a median depth of 3.4"; the depth exceeds 6.1" only one year out of ten.
The relative humidity typically ranges from 38% (comfortable) to 87% (very humid) over the course of a typical March, rarely dropping below 21% (dry) and reaching as high as 100% (very humid).
The air is driest around March 31, at which time the relative humidity drops below 46% (comfortable) three days out of four; it is most humid around March 23, rising above 79% (humid) three days out of four.
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 26°F (dry) to 48°F (dry) and is rarely below 11°F (dry) or above 61°F (comfortable).
Over the course of March typical wind speeds vary from 1 mph to 15 mph (light air to moderate breeze), rarely exceeding 21 mph (fresh breeze).
The highest average wind speed of 8 mph (gentle breeze) occurs around March 28, at which time the average daily maximum wind speed is 15 mph (moderate breeze).
The lowest average wind speed of 8 mph (gentle breeze) occurs around March 7, at which time the average daily maximum wind speed is 14 mph (moderate breeze).