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Average Weather at Marine Corps Air Station Futenma Japan

At Marine Corps Air Station Futenma, the summers are hot, oppressive, wet, and overcast; the winters are cool and partly cloudy; and it is windy year round. Over the course of the year, the temperature typically varies from 58°F to 89°F and is rarely below 52°F or above 91°F.

The hot season lasts for 3.6 months, from June 11 to September 30, with an average daily high temperature above 84°F. The hottest day of the year is July 13, with an average high of 89°F and low of 81°F.

The cool season lasts for 3.2 months, from December 11 to March 17, with an average daily high temperature below 70°F. The coldest day of the year is January 27, with an average low of 58°F and high of 65°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature, 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

Average Hourly Temperature at Marine Corps Air Station FutenmaJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMhotcoolwarmcomfortable
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.

Clouds

At Marine Corps Air Station Futenma, 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 Marine Corps Air Station Futenma 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 68% of the time, and overcast or mostly cloudy 32% 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 Categories

Cloud Cover Categories at Marine Corps Air Station FutenmaclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Dec 1768%Dec 1768%Jun 1619%Jun 1619%Sep 1443%Sep 1443%Apr 1743%Apr 1743%mostly cloudyclearovercastmostly clearpartly cloudy
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 Marine Corps Air Station Futenma varies significantly throughout the year.

The wetter season lasts 3.1 months, from March 22 to June 26, with a greater than 40% chance of a given day being a wet day. The chance of a wet day peaks at 58% on June 4.

The drier season lasts 8.9 months, from June 26 to March 22. 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 58% on June 4.

Daily Chance of Precipitation

Daily Chance of Precipitation at Marine Corps Air Station FutenmawetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jun 458%Jun 458%Dec 1722%Dec 1722%Mar 2240%Mar 2240%Jun 2640%Jun 2640%rain
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 of the year. Marine Corps Air Station Futenma experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year at Marine Corps Air Station Futenma. 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 an 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.

Sun

The length of the day at Marine Corps Air Station Futenma varies over the course of the year. In 2017, the shortest day is December 22, with 10 hours, 30 minutes of daylight; the longest day is June 21, with 13 hours, 47 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Marine Corps Air Station FutenmaJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2013 hr, 47 minJun 2113 hr, 47 minJun 2112 hr, 8 minSep 2312 hr, 8 minSep 2310 hr, 30 minDec 2210 hr, 30 minDec 22nightnightday
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 9, and the latest sunrise is 1 hour, 42 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, 49 minutes later at 7:25 PM on July 2.

Daylight saving time (DST) is not observed at Marine Corps Air Station Futenma during 2017.

Sunrise & Sunset with Twilight

Sunrise & Sunset with Twilight at Marine Corps Air Station FutenmaJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 95:35 AMJun 95:35 AM7:25 PMJul 27:25 PMJul 2Nov 305:36 PMNov 305:36 PM7:18 AMJan 127:18 AMJan 12daynightnightnightnight
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.

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.

Marine Corps Air Station Futenma experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 7.8 months, from March 28 to November 21, 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 31, with muggy conditions 100% of the time.

The least muggy day of the year is January 14, with muggy conditions 3% of the time.

Humidity Comfort Levels

Humidity Comfort Levels at Marine Corps Air Station FutenmamuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jan 143%Jan 143%100%Jul 31100%Jul 31Mar 2828%Mar 2828%Nov 2128%Nov 2128%oppressiveoppressivedrydrymiserablemiserablehumidhumidcomfortablecomfortablemuggymuggy
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 Marine Corps Air Station Futenma experiences mild 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 9.1 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

Average Wind Speed at Marine Corps Air Station FutenmawindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mphDec 29.1 mphDec 29.1 mphMay 226.6 mphMay 226.6 mphSep 267.8 mphSep 267.8 mphMar 237.8 mphMar 237.8 mph
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 Marine Corps Air Station Futenma varies throughout the year.

The wind is most often from the east for 1.2 months, from April 15 to May 22 and for 2.1 months, from August 2 to October 5, with a peak percentage of 46% on September 27. The wind is most often from the south for 2.4 months, from May 22 to August 2, with a peak percentage of 69% on June 27. The wind is most often from the north for 6.3 months, from October 5 to April 15, with a peak percentage of 64% on January 1.

Wind Direction

Wind Direction at Marine Corps Air Station FutenmaNESENJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%southeastnorthwest
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

Marine Corps Air Station Futenma 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 24 to October 6, 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 24, with an average temperature of 71°F.

Average Water Temperature

The daily average water temperature (purple line), 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 3.4 months, from June 16 to September 28, with an average daily incident shortwave energy per square meter above 5.0 kWh. The brightest day of the year is July 14, 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

Average Daily Incident Shortwave Solar Energy at Marine Corps Air Station FutenmabrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWhJul 145.5 kWhJul 145.5 kWhDec 273.2 kWhDec 273.2 kWhSep 285.0 kWhSep 285.0 kWhFeb 23.6 kWhFeb 23.6 kWh
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 Marine Corps Air Station Futenma are 26.274 deg latitude, 127.756 deg longitude, and 138 ft elevation.

The topography within 2 miles of Marine Corps Air Station Futenma contains significant variations in elevation, with a maximum elevation change of 525 feet and an average elevation above sea level of 203 feet. Within 10 miles also contains significant variations in elevation (636 feet). Within 50 miles contains significant variations in elevation (1,650 feet).

The area within 2 miles of Marine Corps Air Station Futenma is covered by cropland (47%), water (21%), and trees (16%), within 10 miles by water (68%) and cropland (19%), and within 50 miles by water (96%).

Data Sources

This report illustrates the typical weather at Marine Corps Air Station Futenma, 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

Marine Corps Air Station Futenma 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 Kadena Air Base, 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 .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.