This report describes the typical weather at the Charlottesville-Albemarle Airport (Charlottesville, 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.
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 December is characterized by falling daily high temperatures, with daily highs decreasing from 52Â°F to 45Â°F over the course of the month, exceeding 66Â°F or dropping below 33Â°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 14 with 9:31 hours of daylight; the longest day is December 1 with 9:42 hours of daylight.
The earliest sunrise is at 7:12am on December 1; the latest sunset is at 5:04pm on December 31; the latest sunrise is at 7:30am on December 31; the earliest sunset is at 4:53pm on December 9.
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 is 47% (partly cloudy) and does not vary substantially over the course of the month.
On December 16, a representative day, the sky is clear or mostly clear 42% of the time, partly cloudy 6% of the time, and mostly cloudy or overcast 39% of the time.
The average probability that some form of precipitation will be observed in a given day is 37%, with little variation over the course of the month.
Throughout December, the most common forms of precipitation are light rain, moderate rain, and light snow.
Light rain is the most severe precipitation observed during 38% of those days with precipitation. It is most likely around December 5, when it is observed during 15% of all days.
Moderate rain is the most severe precipitation observed during 26% of those days with precipitation. It is most likely around December 1, when it is observed during 10% of all days.
Light snow is the most severe precipitation observed during 14% of those days with precipitation. It is most likely around December 31, when it is observed during 7% of all days.
The likelihood of snow falling is highest around December 31, occurring in 13% of days.
Either snow rarely accumulates at this location in December or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 44% (comfortable) to 84% (humid) over the course of a typical December, rarely dropping below 25% (dry) and reaching as high as 100% (very humid).
The air is driest around December 27, at which time the relative humidity drops below 53% (mildly humid) three days out of four; it is most humid around December 5, rising above 73% (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 18Â°F (dry) to 36Â°F (dry) and is rarely below 2Â°F (dry) or above 54Â°F (very comfortable).
Over the course of December typical wind speeds vary from 0 mph to 12 mph (calm to gentle breeze), rarely exceeding 18 mph (fresh 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 11 mph (gentle breeze).