This report describes the typical weather at the Dayton Wright Brothers Airport (Dayton, Ohio, United States) weather station over the course of an average April. It is based on the historical records from 1999 to 2012. Earlier records are either unavailable or unreliable.
Dayton, Ohio has a humid continental climate with hot summers and no dry season. The area within 25 mi of this station is covered by croplands (84%), built-up areas (10%), and grasslands (4%).
The month of April is characterized by rapidly rising daily high temperatures, with daily highs increasing from 59°F to 68°F over the course of the month, exceeding 78°F or dropping below 44°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 1:10 hours, implying an average day-over-day increase of 2.3 minutes.
The shortest day of the month is April 1 with 12:41 hours of daylight; the longest day is April 30 with 13:52 hours of daylight.
The earliest sunrise is at 6:38am on April 30; the latest sunset is at 8:30pm on April 30; the latest sunrise is at 7:20am on April 1; the earliest sunset is at 8:02pm on April 1.
Daylight saving 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 28% (mostly clear) to 38% (mostly clear). The trend is for the sky to be clearing with the median cloud cover decreasing by 10% from the start to the end of the month.
On April 15, a representative day, the sky is clear or mostly clear 52% of the time, partly cloudy 6% 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 36%, 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 36% of those days with precipitation. They are most likely around April 30, when it is observed during 16% of all days.
Light rain is the most severe precipitation observed during 29% of those days with precipitation. It is most likely around April 19, when it is observed during 11% of all days.
Moderate rain is the most severe precipitation observed during 17% of those days with precipitation. It is most likely around April 2, when it is observed during 6% of all days.
The likelihood of snow falling is highest around April 1, occurring in 6% 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 42% (comfortable) to 88% (very humid) over the course of a typical April, rarely dropping below 27% (dry) and reaching as high as 100% (very humid).
The air is driest around April 8, at which time the relative humidity drops below 50% (mildly humid) three days out of four; it is most humid around April 30, rising above 82% (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 30°F (dry) to 52°F (very comfortable) and is rarely below 18°F (dry) or above 62°F (mildy humid).
Over the course of April typical wind speeds vary from 1 mph to 16 mph (light air to moderate breeze), rarely exceeding 22 mph (fresh breeze).
The highest average wind speed of 9 mph (gentle breeze) occurs around April 7, at which time the average daily maximum wind speed is 16 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).