This report describes the typical weather at the DeKalb-Peachtree Airport (Atlanta, Georgia, United States) weather station over the course of an average April. It is based on the historical records from 1998 to 2012. Earlier records are either unavailable or unreliable.
Atlanta, Georgia has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by croplands (43%), forests (30%), and built-up areas (25%).
The month of April is characterized by rising daily high temperatures, with daily highs increasing from 69°F to 76°F over the course of the month, exceeding 84°F or dropping below 57°F only one day in ten.
Over the course of April, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 58 minutes, implying an average day-over-day increase of 1.9 minutes.
The shortest day of the month is April 1 with 12:34 hours of daylight; the longest day is April 30 with 13:32 hours of daylight.
The earliest sunrise is at 6:49am on April 30; the latest sunset is at 8:21pm on April 30; the latest sunrise is at 7:24am on April 1; the earliest sunset is at 7:58pm 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 12% (mostly clear) to 19% (mostly clear). The trend is for the sky to be clearing with the median cloud cover decreasing by 6% from the start to the end of the month.
On April 15, a representative day, the sky is clear or mostly clear 61% of the time, partly cloudy 6% of the time, and mostly cloudy or overcast 33% 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 April, the most common forms of precipitation are thunderstorms, light rain, moderate rain, and heavy rain.
Thunderstorms are the most severe precipitation observed during 33% of those days with precipitation. They are most likely around April 29, when it is observed during 14% of all days.
Light rain is the most severe precipitation observed during 29% of those days with precipitation. It is most likely around April 14, when it is observed during 10% of all days.
Moderate rain is the most severe precipitation observed during 21% of those days with precipitation. It is most likely around April 1, when it is observed during 8% of all days.
Heavy rain is the most severe precipitation observed during 17% of those days with precipitation. It is most likely around April 4, when it is observed during 6% of all days.
Either snow is exceptionally unlikely to fall at this location in April or this station does not reliably report precipitation types.
The relative humidity typically ranges from 39% (comfortable) to 91% (very humid) over the course of a typical April, rarely dropping below 22% (dry) and reaching as high as 100% (very humid).
The air is driest around April 14, at which time the relative humidity drops below 49% (comfortable) three days out of four; it is most humid around April 29, rising above 87% (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 April, the dew point typically varies from 39°F (dry) to 58°F (comfortable) and is rarely below 24°F (dry) or above 65°F (muggy).
The time of the month between April 1 and April 30 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of April typical wind speeds vary from 0 mph to 13 mph (calm to moderate breeze), rarely exceeding 20 mph (fresh breeze).
The highest average wind speed of 7 mph (light breeze) occurs around April 7, at which time the average daily maximum wind speed is 13 mph (moderate breeze).
The lowest average wind speed of 6 mph (light breeze) occurs around April 28, at which time the average daily maximum wind speed is 12 mph (moderate breeze).