This report describes the typical weather at the Nashville International Airport (Nashville, Tennessee, United States) weather station over the course of an average April. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Nashville, Tennessee 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 (84%), built-up areas (8%), croplands (4%), and lakes and rivers (3%).
The month of April is characterized by rising daily high temperatures, with daily highs increasing from 66°F to 74°F over the course of the month, exceeding 84°F or dropping below 52°F only one day in ten.
Over the course of April, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 1:02 hours, implying an average day-over-day increase of 2.1 minutes.
The shortest day of the month is April 1 with 12:37 hours of daylight; the longest day is April 30 with 13:39 hours of daylight.
The earliest sunrise is at 5:55am on April 30; the latest sunset is at 7:34pm on April 30; the latest sunrise is at 6:32am on April 1; the earliest sunset is at 7:09pm on April 1.
Daylight savings time is observed in 2012 but it neither starts nor ends in April, so the entire month is in daylight time.
The median cloud cover ranges from 62% (partly cloudy) to 69% (partly cloudy). The trend is for the sky to be clearing with the median cloud cover decreasing by 7% from the start to the end of the month.
On April 15, a representative day, the sky is clear or mostly clear 36% of the time, partly cloudy 20% of the time, and mostly cloudy or overcast 45% of the time.
The average probability that some form of precipitation will be observed in a given day is 43%, with little variation over the course of the month.
Throughout April, the most common forms of precipitation are thunderstorms, light rain, and moderate rain.
Thunderstorms are the most severe precipitation observed during 35% of those days with precipitation. They are most likely around April 30, when it is observed during 18% of all days.
Light rain is the most severe precipitation observed during 35% of those days with precipitation. It is most likely around April 5, when it is observed during 16% of all days.
Moderate rain is the most severe precipitation observed during 21% of those days with precipitation. It is most likely around April 3, when it is observed during 10% of all days.
The likelihood of snow falling is highest around April 1, occurring in 3% of days.
Either snow rarely accumulates at this location in April or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 39% (comfortable) to 89% (very humid) over the course of a typical April, rarely dropping below 23% (dry) and reaching as high as 99% (very humid).
The air is driest around April 10, at which time the relative humidity drops below 48% (comfortable) three days out of four; it is most humid around April 30, rising above 85% (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 April, the dew point typically varies from 34°F (dry) to 56°F (comfortable) and is rarely below 21°F (dry) or above 65°F (muggy).
Over the course of April typical wind speeds vary from 1 mph to 15 mph (light air to moderate breeze), rarely exceeding 23 mph (fresh breeze).
The highest average wind speed of 9 mph (gentle breeze) occurs around April 2, at which time the average daily maximum wind speed is 15 mph (moderate breeze).
The lowest average wind speed of 8 mph (gentle breeze) occurs around April 30, at which time the average daily maximum wind speed is 14 mph (moderate breeze).