This report describes the typical weather at the Kadena Air Base (Okinawa, Japan) weather station over the course of an average year. 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%).
Over the course of a year, the temperature typically varies from 55°F to 90°F and is rarely below 49°F or above 93°F.
The warm season lasts from June 14 to October 2 with an average daily high temperature above 85°F. The hottest day of the year is July 25, with an average high of 90°F and low of 80°F.
The cold season lasts from December 13 to March 17 with an average daily high temperature below 71°F. The coldest day of the year is February 2, with an average low of 55°F and high of 66°F.
The length of the day varies significantly over the course of the year. The shortest day is December 21 with 10:30 hours of daylight; the longest day is June 20 with 13:47 hours of daylight.
The earliest sunrise is at 5:35am on June 12 and the latest sunset is at 7:26pm on June 30. The latest sunrise is at 7:19am on January 15 and the earliest sunset is at 5:36pm on December 1.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover ranges from 59% (partly cloudy) to 88% (mostly cloudy). The sky is cloudiest on February 18 and clearest on September 13. The clearer part of the year begins around June 30. The cloudier part of the year begins around November 14.
On September 13, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 36% of the time, and overcast or mostly cloudy 24% of the time.
On February 18, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 46% of the time, and clear or mostly clear 11% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around May 20, occurring in 72% of days. Precipitation is least likely around July 20, occurring in 62% of days.
Over the entire year, the most common forms of precipitation are moderate rain, light rain, and thunderstorms.
Moderate rain is the most severe precipitation observed during 48% of those days with precipitation. It is most likely around January 18, when it is observed during 40% of all days.
Light rain is the most severe precipitation observed during 32% of those days with precipitation. It is most likely around November 22, when it is observed during 25% of all days.
Thunderstorms are the most severe precipitation observed during 13% of those days with precipitation. They are most likely around August 8, when it is observed during 19% of all days.
During the warm season, which lasts from June 14 to October 2, there is a 66% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of moderate rain (43% of days with precipitation have at worst moderate rain), light rain (26%), thunderstorms (24%), and heavy rain (6%).
During the cold season, which lasts from December 13 to March 17, there is a 69% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of moderate rain (55% of days with precipitation have at worst moderate rain) and light rain (35%).
Either snow is exceptionally unlikely to fall at any time during the year at this location or this station does not reliably report precipitation types.
The relative humidity typically ranges from 55% (mildly humid) to 93% (very humid) over the course of the year, rarely dropping below 42% (comfortable) and reaching as high as 100% (very humid).
The air is driest around January 3, at which time the relative humidity drops below 62% (mildly humid) three days out of four; it is most humid around June 6, exceeding 90% (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 year, the dew point typically varies from 46°F (dry) to 79°F (oppressive) and is rarely below 37°F (dry) or above 81°F (very oppressive).
There are two periods in the year that are most comfortable: The first is between January 1 and April 12 and the second is between November 16 and December 31. The air feels neither too dry nor too muggy during these periods.
Over the course of the year typical wind speeds vary from 2 mph to 16 mph (light air to moderate breeze), rarely exceeding 25 mph (strong breeze).
The highest average wind speed of 10 mph (gentle breeze) occurs around November 26, at which time the average daily maximum wind speed is 16 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).