This report describes the typical weather at the Kadena Air Base (Okinawa, Japan) 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.
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 April is characterized by rising daily high temperatures, with daily highs increasing from 73Â°F to 79Â°F over the course of the month, exceeding 84Â°F or dropping below 67Â°F only one day in ten.
Over the course of April, the length of the day is gradually increasing. The shortest day of the month is April 1 with 12:26 hours of daylight; the longest day is April 30 with 13:08 hours of daylight.
The earliest sunrise is at 5:52am on April 30; the latest sunset is at 7:01pm on April 30; the latest sunrise is at 6:20am on April 1; the earliest sunset is at 6:46pm on April 1.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover is 84% (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 13% of the time, partly cloudy 12% of the time, and mostly cloudy or overcast 33% of the time.
The average probability that some form of precipitation will be observed in a given day is 69%, with little variation over the course of the month.
Throughout April, the most common forms of precipitation are moderate rain, light rain, and thunderstorms.
Moderate rain is the most severe precipitation observed during 46% of those days with precipitation. It is most likely around April 11, when it is observed during 32% of all days.
Light rain is the most severe precipitation observed during 32% of those days with precipitation. It is most likely around April 6, when it is observed during 23% of all days.
Thunderstorms are the most severe precipitation observed during 15% of those days with precipitation. They are most likely around April 19, when it is observed during 11% of all days.
Either snow is exceptionally unlikely to fall at this location in April or this station does not reliably report precipitation types.
The relative humidity typically ranges from 62% (mildly humid) to 90% (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 1, at which time the relative humidity drops below 71% (humid) three days out of four; it is most humid around April 29, rising above 86% (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 55Â°F (very comfortable) to 69Â°F (muggy) and is rarely below 44Â°F (dry) or above 75Â°F (very muggy).
Over the course of April 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 April 1, 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 April 30, at which time the average daily maximum wind speed is 14 mph (moderate breeze).