This report describes the typical weather at the Dublin International Airport (Dublin, Ireland) 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.
Dublin has a mild humid temperate climate with warm summers and no dry season. The area within 25 mi of this station is covered by grasslands (53%), oceans and seas (39%), built-up areas (4%), and croplands (3%).
The month of April is characterized by gradually rising daily high temperatures, with daily highs increasing from 51°F to 55°F over the course of the month, exceeding 61°F or dropping below 45°F only one day in ten.
Over the course of April, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1:58 hours, implying an average day-over-day increase of 3.9 minutes.
The shortest day of the month is April 1 with 13:03 hours of daylight; the longest day is April 30 with 15:01 hours of daylight.
The earliest sunrise is at 5:52am on April 30; the latest sunset is at 8:53pm on April 30; the latest sunrise is at 6:58am on April 1; the earliest sunset is at 8:01pm 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 is 86% (mostly cloudy) and does not vary substantially over the course of the month.
On April 15, a representative day, the sky is clear or mostly clear 21% of the time, partly cloudy 18% of the time, and mostly cloudy or overcast 56% of the time.
The average probability that some form of precipitation will be observed in a given day is 71%, with little variation over the course of the month.
Throughout April, the most common forms of precipitation are moderate rain and light rain.
Moderate rain is the most severe precipitation observed during 71% of those days with precipitation. It is most likely around April 1, when it is observed during 51% of all days.
Light rain is the most severe precipitation observed during 14% of those days with precipitation. It is most likely around April 29, when it is observed during 11% of all days.
The likelihood of snow falling is highest around April 1, occurring in 7% 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 60% (mildly humid) to 95% (very humid) over the course of a typical April, rarely dropping below 46% (comfortable) and reaching as high as 100% (very humid).
The air is driest around April 18, at which time the relative humidity drops below 67% (mildly humid) three days out of four; it is most humid around April 1, rising above 93% (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 34°F (dry) to 46°F (dry) and is rarely below 27°F (dry) or above 52°F (very comfortable).
Over the course of April typical wind speeds vary from 3 mph to 18 mph (light air to fresh breeze), rarely exceeding 29 mph (strong breeze).
The highest average wind speed of 12 mph (gentle breeze) occurs around April 1, at which time the average daily maximum wind speed is 18 mph (fresh breeze).
The lowest average wind speed of 11 mph (gentle breeze) occurs around April 25, at which time the average daily maximum wind speed is 17 mph (moderate breeze).