This report describes the historical weather record at the Charlottesville-Albemarle Airport (Charlottesville, Virginia, United States) during the last 12 months. This station has records back to April 1961.
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%)
Daylight saving time (DST) was observed at Charlottesville, Virginia during the last 12 months. There were two time changes during the last 12 months:
2017 is not a leap year, so it has 365 days and no February 29th. The first leap year before 2017 was 2016 and the first after will be 2020.
The summer and winter solstices and the spring and fall equinoxes mark the passing of the seasons. They fall on nearly the same day each year, with differences of a day or two depending on the year. In 2017 they occurred on:
|Spring Equinox||Monday, 20 March 2017.|
|Summer Solstice||Wednesday, 21 June 2017.|
|Fall Equinox||Friday, 22 September 2017.|
|Winter Solstice||Thursday, 21 December 2017.|
The hottest day of the last 12 months was July 23, with a high temperature of 99Â°F. For reference, on that day the average high temperature is 87Â°F and the high temperature exceeds 94Â°F only one day in ten. The hottest month of the last 12 months was July with an average daily high temperature of 90Â°F.
Relative to the average, the hottest day was February 12. The high temperature that day was 79Â°F, compared to the average of 47Â°F, a difference of 32Â°F. In relative terms the warmest month was February, with an average high temperature of 60Â°F, compared to an typical value of 48Â°F.
The longest warm spell was from July 12 to August 3, constituting 23 consecutive days with warmer than average high temperatures. The month of July had the largest fraction of warmer than average days with 87% days with higher than average high temperatures.
The coldest day of the last 12 months was January 9, with a low temperature of 8Â°F. For reference, on that day the average low temperature is 29Â°F and the low temperature drops below 16Â°F only one day in ten. The coldest month of the last 12 months was February with an average daily low temperature of 32Â°F.
Relative to the average, the coldest day was January 9. The low temperature that day was 8Â°F, compared to the average of 29Â°F, a difference of 21Â°F. In relative terms the coldest month was April, with an average low temperature of 46Â°F, compared to an typical value of 46Â°F.
The longest cold spell was from May 14 to May 26, constituting 13 consecutive days with cooler than average low temperatures. The month of May had the largest fraction of cooler than average days with 52% days with lower than average low temperatures.
The clearest month of the last 12 months was February, with 76% of days being more clear than cloudy. The longest spell of clear weather was from July 14 to July 29, constituting 16 consecutive days that were clearer than they were cloudy.
The cloudiest month of the last 12 months was January, with 58% of days being more cloudy than clear. The longest spell of cloudy weather was from April 27 to May 8, constituting 12 consecutive days that were cloudier than they were clear.
This station reports both the quantity of liquid precipitation and categorical observations of precipitation (e.g., moderate rain, or heavy snow). Both are subject to erroneous reports, but the former is particularly prone to false reports, especially ones indicating an excessive quantity of precipitation. Please bear this in mind when reading the extrema reported in this section.
The day with the largest quantity of precipitation was June 16. That day saw 1.319" of liquid (or liquid equivalent) precipitation, compared to a median value of 0.124". The month with the most precipitation was May, with 5.567", compared to a median value of 3.850".
As determined by quantitative measurements, the longest dry spell was from April 8 to April 22, constituting 15 consecutive days with no measured precipitation. The month with the largest fraction of dry days was February, with 90% of days reporting no measured precipitation at all.
The month with the largest fraction of days with at least some measured precipitation was May, with 55% of days reporting some measured precipitation.
This station reports when significant weather events (including precipitation) are visually observed at or near the station. Such events do not always correspond to measured quantities of liquid equivalent precipitation, such as when the event is near by not at the station, or in the case of solid precipitation that does not melt in the collection basin.
The day in the last 12 months with the most precipitation observations was January 23. There were 16 hourly weather reports that day (out of a maximum of 24) in which some form of precipitation was observated at or near the station. The month with the most precipitation observations was January, with 93 hourly present weather reports involving some form of precipitation.
As determined by the present weather reports, the longest dry spell was from February 26 to November 9, constituting 258 consecutive days with no observed precipitation. The months of March, April, May, June, July, August, September, and October were completely without observed precipitation.
The month with the largest fraction of days with at least some observed precipitation was January, with 58% of days reporting some observed precipitation.
In this section we consider only those weather reports that indicate liquid precipitation. For the purposes of this analysis, we include thunderstorms even though some thunderstorms are not accompanied by liquid precipitation.
The month of the last 12 months with the largest number of those reports was January, with a total of 72 reports. The day with the largest number of those reports was January 23, with a total of 16 reports.
This station reports when snow is observed falling but does not report the quantity of snow that has fallen or the depth of snow on the ground.
In this section we consider hourly weather reports that contain an observation of falling snow. These reports do not necessarily correspond to accumulation.
The first reported snow fall in the last 12 months was on January 6; the last was on January 30. The month of the last 12 months with the largest number of those reports was January, with a total of 21 reports. The day with the largest number of those reports was January 7, with a total of 13 reports.
Humidity is an important factor in determining how weather conditions feel to a person experiencing them. Hot and humid days feel even hotter than hot and dry days because the high level of water content in humid air discourages the evaporation of sweat from a person's skin.
When reading the graph below, keep in mind that the hottest part of the day tends to be the least humid, so the daily low (brown) traces are more relevant for understanding daytime comfort than the daily high (blue) traces, which typically occur during the night. Applying that observation, the least humid month of the last 12 months was February with an average daily low humidity of 29%, and the most humid month was August with an average daily low humidity of 52%.
But it is important to keep in mind that humidity does not tell the whole picture and the dew point is often a better measure of how comfortable a person will find a given set of weather conditions. Please see the next section for continued discussion of this point.
Dew point is the temperature below which water vapor will condense into liquid water. It is therefore also related to the rate of evaporation of liquid water. Since the evaporation of sweat is an important cooling mechanism for the human body, the dew point is an important measurement for understanding how dry, comfortable, or humid a given set of weather conditions will feel.
Generally speaking, dew points below 50Â°F will feel a bit dry to some people, but comfortable to people accustomed to dry conditions; dew points from 50Â°F to 68Â°F are fairly comfortable to most people, and dew points above 68Â°F are increasingly uncomfortable, becoming oppressive around 77Â°F.
To take some examples, and basing our categorization on the daily high dew point in the last 12 months, March had 19 dry days, 12 comfortable days, and no humid days; June had 1 dry day, 15 comfortable days, and 14 humid days; September had no dry days, 18 comfortable days, and 12 humid days; and December had 28 dry days, 3 comfortable days, and no humid days.
The highest sustained wind speed was 30 mph, occurring on January 23; the highest daily mean wind speed was 15 mph (January 12); and the highest wind gust speed was 49 mph (June 16).
The windiest month was March, with an average wind speed of 7 mph. The least windy month was July, with an average wind speed of 4 mph.
Visibility is the maximum distance at which a given reference object or light can be clearly discerned. In the United States, visibilities that are greater than or equal to 10 miles are typically reported as 10 miles.
The day of the last 12 months with the lowest average visibility was January 21, with an average visibility of 1.2 mi. The month with the lowest average visibility was January, with an average visibility of 8.2 mi. With an average visibility of 9.9 mi, the month of February had the highest average visibility.
The cloud ceiling is the altitude of the lowest layer of clouds that are at categorized as broken (mostly cloudy) or overcast (cloudy). If no such cloud layer exists then the ceiling is unlimited and no value is reported.
The day of the last 12 months with the lowest average cloud ceiling was July 17, with an average cloud ceiling of 98'. The month with the lowest average cloud ceiling was March, with an average cloud ceiling of 4711'. The month of February has the highest average cloud ceiling, with an average cloud ceiling of 8291'.