This report describes the typical weather at the Dublin International Airport (Dublin, Ireland) weather station over the course of an average May. 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 May is characterized by rising daily high temperatures, with daily highs increasing from 55°F to 60°F over the course of the month, exceeding 66°F or dropping below 49°F only one day in ten.
Over the course of May, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1:34 hours, implying an average day-over-day increase of 3.0 minutes.
The shortest day of the month is May 1 with 15:06 hours of daylight; the longest day is May 31 with 16:40 hours of daylight.
The earliest sunrise is at 5:03am on May 31; the latest sunset is at 9:43pm on May 31; the latest sunrise is at 5:49am on May 1; the earliest sunset is at 8:55pm on May 1.
Daylight savings time is observed in 2012 but it neither starts nor ends in May, 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 May 16, a representative day, the sky is clear or mostly clear 21% of the time, partly cloudy 19% 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 68%, with little variation over the course of the month.
Throughout May, the most common forms of precipitation are moderate rain and light rain.
Moderate rain is the most severe precipitation observed during 73% of those days with precipitation. It is most likely around May 28, when it is observed during 50% of all days.
Light rain is the most severe precipitation observed during 15% of those days with precipitation. It is most likely around May 1, when it is observed during 11% of all days.
The likelihood of snow falling is highest around May 1, occurring in 4% of days.
Either snow rarely accumulates at this location in May 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 May, rarely dropping below 46% (comfortable) and reaching as high as 100% (very humid).
The air is driest around May 28, at which time the relative humidity drops below 68% (mildly humid) three days out of four; it is most humid around May 29, 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 May, the dew point typically varies from 38°F (dry) to 51°F (very comfortable) and is rarely below 31°F (dry) or above 56°F (comfortable).
Over the course of May typical wind speeds vary from 3 mph to 17 mph (light air to moderate breeze), rarely exceeding 25 mph (strong breeze).
The highest average wind speed of 11 mph (gentle breeze) occurs around May 2, at which time the average daily maximum wind speed is 17 mph (moderate breeze).
The lowest average wind speed of 10 mph (gentle breeze) occurs around May 29, at which time the average daily maximum wind speed is 16 mph (moderate breeze).