This report describes the typical weather at the Norfolk International Airport (Norfolk, Virginia, United States) weather station over the course of an average April. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Norfolk, Virginia has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by oceans and seas (45%), forests (22%), croplands (20%), built-up areas (9%), and lakes and rivers (4%).
The month of April is characterized by rising daily high temperatures, with daily highs increasing from 63Â°F to 72Â°F over the course of the month, exceeding 84Â°F or dropping below 50Â°F only one day in ten.
Over the course of April, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 1:04 hours, implying an average day-over-day increase of 2.1 minutes.
The shortest day of the month is April 1 with 12:38 hours of daylight; the longest day is April 30 with 13:42 hours of daylight.
The earliest sunrise is at 6:11am on April 30; the latest sunset is at 7:53pm on April 30; the latest sunrise is at 6:50am on April 1; the earliest sunset is at 7:28pm on April 1.
Daylight savings time is observed in 2012 but it neither starts nor ends in April, so the entire month is in daylight time.
The median cloud cover is 50% (partly cloudy) and does not vary substantially over the course of the month.
On April 15, a representative day, the sky is clear or mostly clear 47% of the time, partly cloudy 14% of the time, and mostly cloudy or overcast 38% of the time.
The average probability that some form of precipitation will be observed in a given day is 45%, with little variation over the course of the month.
Throughout April, the most common forms of precipitation are moderate rain, light rain, and thunderstorms.
Moderate rain is the most severe precipitation observed during 36% of those days with precipitation. It is most likely around April 3, when it is observed during 17% of all days.
Light rain is the most severe precipitation observed during 34% of those days with precipitation. It is most likely around April 9, when it is observed during 16% of all days.
Thunderstorms are the most severe precipitation observed during 17% of those days with precipitation. They are most likely around April 30, when it is observed during 10% of all days.
The likelihood of snow falling is highest around April 1, occurring in 2% of days.
Either snow rarely accumulates at this location in April or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 43% (comfortable) to 87% (very humid) over the course of a typical April, rarely dropping below 24% (dry) and reaching as high as 100% (very humid).
The air is driest around April 11, at which time the relative humidity drops below 53% (mildly humid) three days out of four; it is most humid around April 30, rising above 82% (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 April, the dew point typically varies from 34Â°F (dry) to 56Â°F (comfortable) and is rarely below 20Â°F (dry) or above 66Â°F (muggy).
The time of the month between April 7 and April 30 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of April typical wind speeds vary from 4 mph to 19 mph (light breeze to fresh breeze), rarely exceeding 25 mph (strong breeze).
The highest average wind speed of 11 mph (gentle breeze) occurs around April 1, at which time the average daily maximum wind speed is 19 mph (fresh breeze).
The lowest average wind speed of 11 mph (gentle breeze) occurs around April 30, at which time the average daily maximum wind speed is 17 mph (moderate breeze).