This report describes the typical weather at the Kadena Air Base (Okinawa, Japan) weather station over the course of an average July. 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 July is characterized by essentially constant daily high temperatures, with daily highs around 89Â°F throughout the month, exceeding 93Â°F or dropping below 85Â°F only one day in ten.
Over the course of July, the length of the day is essentially constant. The shortest day of the month is July 31 with 13:22 hours of daylight; the longest day is July 1 with 13:46 hours of daylight.
The earliest sunrise is at 5:39am on July 1; the latest sunset is at 7:26pm on July 6; the latest sunrise is at 5:54am on July 31; the earliest sunset is at 7:16pm on July 31.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover ranges from 64% (partly cloudy) to 73% (partly cloudy). The trend is for the sky to be clearing with the median cloud cover decreasing by 9% from the start to the end of the month.
On July 16, a representative day, the sky is clear or mostly clear 16% of the time, partly cloudy 15% of the time, and mostly cloudy or overcast 26% of the time.
The average probability that some form of precipitation will be observed in a given day is 63%, with little variation over the course of the month.
Throughout July, the most common forms of precipitation are moderate rain, thunderstorms, and light rain.
Moderate rain is the most severe precipitation observed during 42% of those days with precipitation. It is most likely around July 31, when it is observed during 28% of all days.
Thunderstorms are the most severe precipitation observed during 26% of those days with precipitation. They are most likely around July 31, when it is observed during 17% of all days.
Light rain is the most severe precipitation observed during 26% of those days with precipitation. It is most likely around July 1, when it is observed during 17% of all days.
Either snow is exceptionally unlikely to fall at this location in July or this station does not reliably report precipitation types.
The relative humidity typically ranges from 65% (mildly humid) to 91% (very humid) over the course of a typical July, rarely dropping below 56% (mildly humid) and reaching as high as 98% (very humid).
The air is driest around July 25, at which time the relative humidity drops below 70% (mildly humid) three days out of four; it is most humid around July 1, rising above 88% (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 July, the dew point typically varies from 74Â°F (very muggy) to 79Â°F (oppressive) and is rarely below 71Â°F (very muggy) or above 81Â°F (very oppressive).
Over the course of July typical wind speeds vary from 3 mph to 15 mph (light air to moderate breeze), rarely exceeding 23 mph (fresh breeze).
The highest average wind speed of 10 mph (gentle breeze) occurs around July 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 July 16, at which time the average daily maximum wind speed is 14 mph (moderate breeze).