This report describes the typical weather at the Danville Regional Airport (Danville, Virginia, United States) weather station over the course of an average year. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Danville, 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 (98%).
Over the course of a year, the temperature typically varies from 29°F to 88°F and is rarely below 17°F or above 95°F.
The warm season lasts from May 28 to September 17 with an average daily high temperature above 80°F. The hottest day of the year is July 14, with an average high of 88°F and low of 69°F.
The cold season lasts from December 1 to February 26 with an average daily high temperature below 55°F. The coldest day of the year is January 18, with an average low of 29°F and high of 46°F.
The length of the day varies significantly over the course of the year. The shortest day is December 21 with 9:40 hours of daylight; the longest day is June 20 with 14:40 hours of daylight.
The earliest sunrise is at 5:58am on June 10 and the latest sunset is at 8:40pm on July 1. The latest sunrise is at 7:43am on November 3 and the earliest sunset is at 5:01pm on December 6.
Daylight savings time (DST) is observed in this location during 2012, starting in the spring on March 11 and ending in the fall on November 4.
The median cloud cover ranges from 41% (partly cloudy) to 62% (partly cloudy). The sky is cloudiest on May 21 and clearest on October 29. The clearer part of the year begins around September 12. The cloudier part of the year begins around December 3.
On October 29, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 47% of the time, and overcast or mostly cloudy 36% of the time.
On May 21, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 51% of the time, and clear or mostly clear 32% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around July 2, occurring in 41% of days. Precipitation is least likely around October 10, occurring in 28% of days.
Over the entire year, the most common forms of precipitation are light rain, thunderstorms, and moderate rain.
Light rain is the most severe precipitation observed during 44% of those days with precipitation. It is most likely around January 25, when it is observed during 19% of all days.
Thunderstorms are the most severe precipitation observed during 28% of those days with precipitation. They are most likely around July 2, when it is observed during 25% of all days.
Moderate rain is the most severe precipitation observed during 14% of those days with precipitation. It is most likely around October 24, when it is observed during 7% of all days.
During the warm season, which lasts from May 28 to September 17, there is a 38% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of thunderstorms (55% of days with precipitation have at worst thunderstorms), light rain (30%), and moderate rain (9%).
During the cold season, which lasts from December 1 to February 26, there is a 35% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of light rain (53% of days with precipitation have at worst light rain), moderate rain (16%), light snow (10%), and heavy snow (6%).
The likelihood of snow falling is highest around February 2, occurring in 9% of days.
During peak snow season, accumulation at this location on a given day is very unlikely. The chances of there being snow on the ground are highest around January 16, occurring 7% of the time.
The snow is typically at its deepest on February 26, with a median depth of 4.5"; the depth exceeds 6.3" only one year out of ten.
The relative humidity typically ranges from 37% (comfortable) to 97% (very humid) over the course of the year, rarely dropping below 19% (dry) and reaching as high as 100% (very humid).
The air is driest around April 11, at which time the relative humidity drops below 44% (comfortable) three days out of four; it is most humid around September 12, exceeding 96% (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 year, the dew point typically varies from 19°F (dry) to 72°F (very muggy) and is rarely below 3°F (dry) or above 75°F (very muggy).
There are two periods in the year that are most comfortable: The first is between April 21 and June 4 and the second is between September 14 and October 26. The air feels neither too dry nor too muggy during these periods.
Over the course of the year typical wind speeds vary from 0 mph to 14 mph (calm to moderate breeze), rarely exceeding 20 mph (fresh breeze).
The highest average wind speed of 8 mph (gentle breeze) occurs around March 30, at which time the average daily maximum wind speed is 14 mph (moderate breeze).
The lowest average wind speed of 5 mph (light breeze) occurs around August 16, at which time the average daily maximum wind speed is 11 mph (gentle breeze).