This report describes the typical weather at the Key West International Airport (Key West, Florida, United States) 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.
Key West, Florida has a tropical savanna climate with dry winters. The area within 25 mi of this station is covered by oceans and seas (98%).
The month of May is characterized by gradually rising daily high temperatures, with daily highs around 85Â°F throughout the month, exceeding 89Â°F or dropping below 80Â°F only one day in ten.
Over the course of May, the length of the day is essentially constant. The shortest day of the month is May 1 with 13:05 hours of daylight; the longest day is May 31 with 13:33 hours of daylight.
The earliest sunrise is at 6:38am on May 30; the latest sunset is at 8:11pm on May 31; the latest sunrise is at 6:52am on May 1; the earliest sunset is at 7:57pm 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 ranges from 36% (mostly clear) to 42% (partly cloudy). The trend is for the sky to be becoming cloudier with the median cloud cover increasing by 6% from the start to the end of the month.
On May 16, a representative day, the sky is clear or mostly clear 50% of the time, partly cloudy 26% of the time, and mostly cloudy or overcast 22% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around May 31, occurring in 42% of days. Precipitation is least likely around May 1, occurring in 28% of days.
Throughout May, the most common forms of precipitation are thunderstorms, light rain, and moderate rain.
Thunderstorms are the most severe precipitation observed during 41% of those days with precipitation. They are most likely around May 31, when it is observed during 21% of all days.
Light rain is the most severe precipitation observed during 32% of those days with precipitation. It is most likely around May 11, when it is observed during 11% of all days.
Moderate rain is the most severe precipitation observed during 21% of those days with precipitation. It is most likely around May 2, when it is observed during 8% 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 61% (mildly humid) to 86% (very humid) over the course of a typical May, rarely dropping below 50% (comfortable) and reaching as high as 99% (very humid).
The air is driest around May 1, at which time the relative humidity drops below 67% (mildly humid) three days out of four; it is most humid around May 26, rising above 81% (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 65Â°F (muggy) to 75Â°F (very muggy) and is rarely below 58Â°F (comfortable) or above 78Â°F (oppressive).
Over the course of May typical wind speeds vary from 5 mph to 16 mph (light breeze to moderate breeze), rarely exceeding 20 mph (fresh breeze).
The highest average wind speed of 11 mph (gentle breeze) occurs around May 1, at which time the average daily maximum wind speed is 16 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 14 mph (moderate breeze).