This report describes the typical weather at the Charlottesville-Albemarle Airport (Charlottesville, Virginia, United States) weather station over the course of an average May. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Charlottesville, 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 forests (99%).
The month of May is characterized by rising daily high temperatures, with daily highs increasing from 72Â°F to 79Â°F over the course of the month, exceeding 88Â°F or dropping below 60Â°F only one day in ten.
Over the course of May, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 49 minutes, implying an average day-over-day increase of 1.6 minutes.
The shortest day of the month is May 1 with 13:48 hours of daylight; the longest day is May 31 with 14:38 hours of daylight.
The earliest sunrise is at 5:53am on May 30; the latest sunset is at 8:30pm on May 31; the latest sunrise is at 6:17am on May 1; the earliest sunset is at 8:06pm on May 1.
Daylight savings time is observed in 2012 but it neither starts nor ends in May, so the entire month is in daylight time.
The median cloud cover is 55% (partly cloudy) and does not vary substantially over the course of the month.
On May 16, a representative day, the sky is clear or mostly clear 38% of the time, partly cloudy 8% of the time, and mostly cloudy or overcast 42% 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 May, the most common forms of precipitation are light rain, thunderstorms, and moderate rain.
Light rain is the most severe precipitation observed during 40% of those days with precipitation. It is most likely around May 1, when it is observed during 20% of all days.
Thunderstorms are the most severe precipitation observed during 31% of those days with precipitation. They are most likely around May 31, when it is observed during 17% of all days.
Moderate rain is the most severe precipitation observed during 21% of those days with precipitation. It is most likely around May 1, when it is observed during 10% of all days.
Either snow is exceptionally unlikely to fall at this location in May or this station does not reliably report precipitation types.
The relative humidity typically ranges from 41% (comfortable) to 92% (very humid) over the course of a typical May, rarely dropping below 22% (dry) and reaching as high as 100% (very humid).
The air is driest around May 1, at which time the relative humidity drops below 49% (comfortable) three days out of four; it is most humid around May 31, rising above 87% (very 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 May, the dew point typically varies from 40Â°F (dry) to 63Â°F (mildy humid) and is rarely below 26Â°F (dry) or above 71Â°F (very muggy).
The time of the month between May 1 and May 31 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of May typical wind speeds vary from 0 mph to 12 mph (calm to moderate breeze), rarely exceeding 18 mph (fresh breeze).
The highest average wind speed of 6 mph (light breeze) occurs around May 2, at which time the average daily maximum wind speed is 12 mph (moderate breeze).
The lowest average wind speed of 5 mph (light breeze) occurs around May 30, at which time the average daily maximum wind speed is 11 mph (gentle breeze).