This report describes the typical weather at the Kadena Air Base (Okinawa, Japan) 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.
Okinawa has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by oceans and seas (85%), croplands (8%), and forests (7%).
The month of May is characterized by gradually rising daily high temperatures, with daily highs around 80Â°F throughout the month, exceeding 87Â°F or dropping below 74Â°F only one day in ten.
Over the course of May, the length of the day is gradually increasing. The shortest day of the month is May 1 with 13:10 hours of daylight; the longest day is May 31 with 13:41 hours of daylight.
The earliest sunrise is at 5:37am on May 31; the latest sunset is at 7:17pm on May 31; the latest sunrise is at 5:52am on May 1; the earliest sunset is at 7:01pm on May 1.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover is 85% (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 12% of the time, partly cloudy 12% of the time, and mostly cloudy or overcast 35% 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 May, the most common forms of precipitation are moderate rain, light rain, and thunderstorms.
Moderate rain is the most severe precipitation observed during 44% of those days with precipitation. It is most likely around May 2, when it is observed during 32% of all days.
Light rain is the most severe precipitation observed during 31% of those days with precipitation. It is most likely around May 7, when it is observed during 23% of all days.
Thunderstorms are the most severe precipitation observed during 18% of those days with precipitation. They are most likely around May 25, when it is observed during 14% 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 65% (mildly humid) to 93% (very humid) over the course of a typical May, rarely dropping below 49% (comfortable) and reaching as high as 100% (very humid).
The air is driest around May 3, at which time the relative humidity drops below 73% (humid) three days out of four; it is most humid around May 31, rising above 89% (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 62Â°F (mildy humid) to 74Â°F (very muggy) and is rarely below 53Â°F (very comfortable) or above 79Â°F (oppressive).
Over the course of May typical wind speeds vary from 3 mph to 15 mph (light air to moderate breeze), rarely exceeding 21 mph (fresh breeze).
The highest average wind speed of 9 mph (gentle breeze) occurs around May 24, at which time the average daily maximum wind speed is 15 mph (moderate breeze).
The lowest average wind speed of 9 mph (gentle breeze) occurs around May 2, at which time the average daily maximum wind speed is 14 mph (moderate breeze).