This report describes the typical weather at the Danville Regional Airport (Danville, Virginia, United States) weather station over the course of an average December. 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%).
The month of December is characterized by falling daily high temperatures, with daily highs decreasing from 55°F to 48°F over the course of the month, exceeding 68°F or dropping below 35°F only one day in ten.
Over the course of December, the length of the day is essentially constant. The shortest day of the month is December 26 with 9:40 hours of daylight; the longest day is December 1 with 9:51 hours of daylight.
The earliest sunrise is at 7:11am on December 1; the latest sunset is at 5:12pm on December 31; the latest sunrise is at 7:29am on December 31; the earliest sunset is at 5:01pm on December 6.
Daylight savings time is observed in 2012 but it neither starts nor ends in December, so the entire month is in standard time.
The median cloud cover ranges from 51% (partly cloudy) to 58% (partly cloudy). The trend is for the sky to be becoming cloudier with the median cloud cover increasing by 7% from the start to the end of the month.
On December 16, a representative day, the sky is clear or mostly clear 36% of the time, partly cloudy 7% of the time, and mostly cloudy or overcast 40% of the time.
The average probability that some form of precipitation will be observed in a given day is 34%, with little variation over the course of the month.
Throughout December, the most common forms of precipitation are light rain and moderate rain.
Light rain is the most severe precipitation observed during 55% of those days with precipitation. It is most likely around December 12, when it is observed during 19% of all days.
Moderate rain is the most severe precipitation observed during 17% of those days with precipitation. It is most likely around December 9, when it is observed during 6% of all days.
The likelihood of snow falling is highest around December 31, occurring in 8% of days.
Accumulation at this location in December is extremely unlikely. The chances of there being snow on the ground are highest around December 31, occurring 3% of the time.
The snow is typically at its deepest on December 31, with a median depth of 3.1"; the depth exceeds 3.9" only one year out of ten.
The relative humidity typically ranges from 46% (comfortable) to 93% (very humid) over the course of a typical December, rarely dropping below 26% (dry) and reaching as high as 100% (very humid).
The air is driest around December 11, at which time the relative humidity drops below 55% (mildly humid) three days out of four; it is most humid around December 1, rising above 89% (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 December, the dew point typically varies from 22°F (dry) to 39°F (dry) and is rarely below 5°F (dry) or above 57°F (comfortable).
Over the course of December typical wind speeds vary from 0 mph to 12 mph (calm to gentle breeze), rarely exceeding 18 mph (moderate breeze).
The highest average wind speed of 6 mph (light breeze) occurs around December 30, at which time the average daily maximum wind speed is 12 mph (gentle breeze).
The lowest average wind speed of 6 mph (light breeze) occurs around December 12, at which time the average daily maximum wind speed is 12 mph (gentle breeze).