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Average Weather at Kadena Air Base Japan

At Kadena Air Base, the temperature typically varies from 57°F to 89°F over the course of the year, and is rarely below 49°F or above 92°F.

The hot season lasts for 3.7 months, from June 12 to October 3, with an average daily high temperature above 85°F. The hottest day of the year is July 20, with an average high of 89°F and low of 80°F.

The cool season lasts for 3.2 months, from December 11 to March 17, with an average daily high temperature below 71°F. The coldest day of the year is January 24, with an average low of 57°F and high of 66°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature with percentile bands, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDeccoolcoolcomfortablecomfortablewarmwarmhothot
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Sun

The length of the day at Kadena Air Base varies over the course of the year. In 2017, the shortest day is December 21, with 10 hours, 29 minutes of daylight; the longest day is June 21, with 13 hours, 48 minutes of daylight.

Hours of Daylight and Twilight

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 5:35 AM on June 10, and the latest sunrise is 1 hour, 43 minutes later at 7:18 AM on January 12. The earliest sunset is at 5:36 PM on November 30, and the latest sunset is 1 hour, 50 minutes later at 7:25 PM on July 2.

Daylight saving time (DST) is not observed at Kadena Air Base during 2017.

Sunrise & Sunset with Twilight

The solar day over the course of the year 2017. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Clouds

At Kadena Air Base, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year at Kadena Air Base begins around September 14 and lasts for 7.1 months, ending around April 17. On December 17, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 69% of the time, and overcast or mostly cloudy 31% of the time.

The cloudier part of the year begins around April 17 and lasts for 4.9 months, ending around September 14. On June 16, the cloudiest day of the year, the sky is overcast or mostly cloudy 81% of the time, and clear, mostly clear, or partly cloudy 19% of the time.

Cloud Cover

clearerclearerclearerclearercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJun 1681%Jun 1681%Dec 1731%Dec 1731%Sep 1457%Sep 1457%Apr 1757%Apr 1757%overcastovercastpartly cloudypartly cloudymostly clearmostly clearclearclear
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Kadena Air Base varies significantly throughout the year.

The wetter season lasts 5.0 months, from March 17 to August 18, with a greater than 40% chance of a given day being a wet day. The chance of a wet day peaks at 57% on June 4.

The drier season lasts 7.0 months, from August 18 to March 17. The smallest chance of a wet day is 22% on December 17.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 57% on June 4.

Daily Chance of Precipitation

The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day in the year. Kadena Air Base experiences very significant seasonal variation in monthly rainfall.

Rain falls throughout the year at Kadena Air Base. The most rain falls during the 31 days centered around June 3, with an average total accumulation of 10.1 inches.

The least rain falls around December 28, with and average total accumulation of 1.8 inches.

Average Monthly Rainfall

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Humidity

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

Kadena Air Base experiences very significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 7.9 months, from March 26 to November 22, during which time the comfort level is muggy, oppressive, or miserable at least 28% of the time. The muggiest day of the year is July 27, with muggy conditions 100% of the time.

The least muggy day of the year is January 13, with muggy conditions 4% of the time.

Humidity Comfort Levels

muggymuggy0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJan 134%Jan 134%100%Jul 27100%Jul 27Mar 2628%Mar 2628%Nov 2229%Nov 2229%miserablemiserablemuggymuggyhumidhumidcomfortablecomfortabledrydry
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed at Kadena Air Base experiences mildly seasonal variation over the course of the year.

The windier part of the year lasts for 5.9 months, from September 26 to March 23, with average wind speeds of more than 7.8 miles per hour. The windiest day of the year is December 2, with an average hourly wind speed of 9.0 miles per hour.

The calmer time of year lasts for 6.1 months, from March 23 to September 26. The calmest day of the year is May 22, with an average hourly wind speed of 6.6 miles per hour.

Average Wind Speed

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction at Kadena Air Base varies throughout the year.

The wind is most often from the east for 1.2 months, from April 17 to May 23 and for 2.1 months, from August 2 to October 5, with a peak percentage of 45% on September 27. The wind is most often from the south for 2.3 months, from May 23 to August 2, with a peak percentage of 69% on June 27. The wind is most often from the north for 6.4 months, from October 5 to April 17, with a peak percentage of 65% on December 26.

Wind Direction

NNEESSEENN0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestwestsouthsoutheasteastnorthnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Kadena Air Base is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.4 months, from June 25 to October 5, with an average temperature above 81°F. The day of the year with the warmest water is July 30, with an average temperature of 84°F.

The time of year with cooler water lasts for 3.6 months, from January 1 to April 20, with an average temperature below 73°F. The day of the year with the coolest water is February 23, with an average temperature of 71°F.

Average Water Temperature

The daily average water temperature (purple line) with percentile bands, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences some seasonal variation over the course of the year.

The brighter period of the year lasts for 3.3 months, from June 17 to September 27, with an average daily incident shortwave energy per square meter above 5.1 kWh. The brightest day of the year is July 22, with an average of 5.5 kWh.

The darker period of the year lasts for 2.4 months, from November 20 to February 2, with an average daily incident shortwave energy per square meter below 3.6 kWh. The darkest day of the year is December 27, with an average of 3.2 kWh.

Average Daily Incident Shortwave Solar Energy

The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Kadena Air Base are 26.350 deg latitude, 127.767 deg longitude, and 128 ft elevation.

The topography within 2 miles of Kadena Air Base contains only modest variations in elevation, with a maximum elevation change of 348 feet, and an average elevation above sea level of 137 feet. Within 10 miles contains significant variations in elevation (715 feet). Within 50 miles contains very significant variations in elevation (1,647 feet).

The area within 2 miles of Kadena Air Base is covered by cropland (63%) and trees (18%), within 10 miles by water (75%) and cropland (13%), and within 50 miles by water (96%).

Data Sources

This report illustrates the typical weather at Kadena Air Base, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

Kadena Air Base has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back are Marine Corps Air Station Futenma, Naha Airport, Kumejima Airport, and Okinoerabu Airport.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for aiports and weather stations are provided by AskGeo.com .