This report describes the typical weather at the Gibraltar Airport (Gibraltar) 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.
Gibraltar has a mediterranean climate with dry hot summers and mild winters. The area within 25 mi of this station is covered by oceans and seas (56%), grasslands (20%), shrublands (18%), croplands (3%), and forests (2%).
The month of May is characterized by rising daily high temperatures, with daily highs increasing from 69°F to 74°F over the course of the month, exceeding 79°F or dropping below 64°F only one day in ten.
Over the course of May, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 45 minutes, implying an average day-over-day increase of 1.5 minutes.
The shortest day of the month is May 1 with 13:41 hours of daylight; the longest day is May 31 with 14:26 hours of daylight.
The earliest sunrise is at 7:06am on May 30; the latest sunset is at 9:32pm on May 31; the latest sunrise is at 7:28am on May 1; the earliest sunset is at 9:09pm on May 1.
Daylight saving 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 ranges from 34% (mostly clear) to 46% (partly cloudy). The trend is for the sky to be clearing with the median cloud cover decreasing by 12% from the start to the end of the month.
On May 31, the clearest day of the month, the sky is clear, mostly clear, or partly cloudy 75% of the time, and overcast or mostly cloudy 17% of the time.
On May 1, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 50% of the time, and clear or mostly clear 43% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around May 1, occurring in 32% of days. Precipitation is least likely around May 31, occurring in 20% of days.
Throughout May, the most common forms of precipitation are moderate rain, thunderstorms, and light rain.
Moderate rain is the most severe precipitation observed during 64% of those days with precipitation. It is most likely around May 1, when it is observed during 21% of all days.
Thunderstorms are the most severe precipitation observed during 19% of those days with precipitation. They are most likely around May 1, when it is observed during 6% of all days.
Light rain is the most severe precipitation observed during 13% of those days with precipitation. It is most likely around May 1, when it is observed during 4% of all days.
Either snow is exceptionally unlikely to fall at this location in May or this station does not reliably report precipitation types.
The relative humidity typically ranges from 53% (mildly humid) to 88% (very humid) over the course of a typical May, rarely dropping below 36% (comfortable) and reaching as high as 98% (very humid).
The air is driest around May 17, at which time the relative humidity drops below 63% (mildly humid) three days out of four; it is most humid around May 23, rising above 83% (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 48°F (dry) to 61°F (comfortable) and is rarely below 40°F (dry) or above 65°F (mildy humid).
The time of the month between May 1 and May 31 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of May typical wind speeds vary from 5 mph to 19 mph (light breeze to fresh breeze), rarely exceeding 26 mph (strong breeze).
The highest average wind speed of 12 mph (moderate breeze) occurs around May 1, at which time the average daily maximum wind speed is 19 mph (fresh breeze).
The lowest average wind speed of 12 mph (gentle breeze) occurs around May 22, at which time the average daily maximum wind speed is 18 mph (fresh breeze).