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Average Weather at Okinoerabu Airport Japan

At Okinoerabu Airport, the summers are hot, oppressive, and mostly cloudy; the winters are cool and partly cloudy; and it is wet and windy year round. Over the course of the year, the temperature typically varies from 58°F to 88°F and is rarely below 52°F or above 90°F.

The hot season lasts for 3.5 months, from June 17 to October 3, with an average daily high temperature above 83°F. The hottest day of the year is July 26, with an average high of 88°F and low of 81°F.

The cool season lasts for 3.3 months, from December 11 to March 20, with an average daily high temperature below 69°F. The coldest day of the year is January 27, with an average low of 58°F and high of 64°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 Okinoerabu Airport12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDeccoolcomfortablewarmhot
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 Okinoerabu Airport, 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 Okinoerabu Airport begins around September 9 and lasts for 7.1 months, ending around April 12. On December 19, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 67% of the time, and overcast or mostly cloudy 33% of the time.

The cloudier part of the year begins around April 12 and lasts for 4.9 months, ending around September 9. On June 20, 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

Cloud Cover at Okinoerabu Airportclearerclearercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJun 2081%Jun 2081%Dec 1933%Dec 1933%Sep 957%Sep 957%Apr 1257%Apr 1257%overcastmostly cloudypartly cloudymostly clearclear
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 Okinoerabu Airport varies significantly throughout the year.

The wetter season lasts 3.7 months, from March 9 to July 1, with a greater than 43% chance of a given day being a wet day. The chance of a wet day peaks at 61% on June 5.

The drier season lasts 8.3 months, from July 1 to March 9. The smallest chance of a wet day is 24% on December 18.

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 61% on June 5.

Daily Chance of Precipitation

Daily Chance of Precipitation at Okinoerabu Airportwetdrydry0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJun 561%Jun 561%Dec 1824%Dec 1824%Mar 943%Mar 943%Jul 143%Jul 143%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. Okinoerabu Airport experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year at Okinoerabu Airport. The most rain falls during the 31 days centered around June 3, with an average total accumulation of 12.0 inches.

The least rain falls around December 28, with an average total accumulation of 2.2 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 Okinoerabu Airport varies over the course of the year. In 2017, the shortest day is December 21, with 10 hours, 25 minutes of daylight; the longest day is June 21, with 13 hours, 53 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 5:29 AM on June 10, and the latest sunrise is 1 hour, 47 minutes later at 7:16 AM on January 11. The earliest sunset is at 5:30 PM on December 1, and the latest sunset is 1 hour, 54 minutes later at 7:24 PM on July 2.

Daylight saving time (DST) is not observed at Okinoerabu Airport during 2017.

Sunrise & Sunset with Twilight

Sunrise & Sunset with Twilight at Okinoerabu Airport2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecJun 105:29 AMJun 105:29 AM7:24 PMJul 27:24 PMJul 2Dec 15:30 PMDec 15:30 PM7:16 AMJan 117:16 AMJan 11daynightnightnightnight
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.

Okinoerabu Airport experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 7.3 months, from April 6 to November 16, during which time the comfort level is muggy, oppressive, or miserable at least 27% of the time. The muggiest day of the year is July 26, with muggy conditions 100% of the time.

The least muggy day of the year is January 14, with muggy conditions 2% of the time.

Humidity Comfort Levels

Humidity Comfort Levels at Okinoerabu Airportmuggy0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJan 142%Jan 142%100%Jul 26100%Jul 26Apr 627%Apr 627%Nov 1627%Nov 1627%miserablemiserableoppressiveoppressivemuggymuggycomfortablecomfortabledrydry
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 Okinoerabu Airport experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.2 months, from September 28 to April 4, with average wind speeds of more than 7.8 miles per hour. The windiest day of the year is January 12, with an average hourly wind speed of 8.9 miles per hour.

The calmer time of year lasts for 5.8 months, from April 4 to September 28. The calmest day of the year is May 19, with an average hourly wind speed of 6.7 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 Okinoerabu Airport varies throughout the year.

The wind is most often from the south for 1.0 weeks, from April 27 to May 4 and for 2.1 months, from May 29 to July 31, with a peak percentage of 64% on June 29. The wind is most often from the east for 3.6 weeks, from May 4 to May 29 and for 2.0 months, from July 31 to September 29, with a peak percentage of 41% on September 27. The wind is most often from the north for 6.9 months, from September 29 to April 27, with a peak percentage of 69% on January 1.

Wind Direction

Wind Direction at Okinoerabu AirportNESEN0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecsoutheastnorthwest
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

Okinoerabu Airport 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 29 to October 9, with an average temperature above 81°F. The day of the year with the warmest water is August 3, with an average temperature of 84°F.

The time of year with cooler water lasts for 3.8 months, from December 31 to April 25, with an average temperature below 73°F. The day of the year with the coolest water is February 26, with an average temperature of 70°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 3.2 months, from June 18 to September 24, with an average daily incident shortwave energy per square meter above 5.0 kWh. The brightest day of the year is July 21, with an average of 5.6 kWh.

The darker period of the year lasts for 2.4 months, from November 19 to February 3, with an average daily incident shortwave energy per square meter below 3.5 kWh. The darkest day of the year is December 27, with an average of 3.0 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at Okinoerabu Airportbrightdarkdark0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWhJanFebMarAprMayJunJulAugSepOctNovDecJul 215.6 kWhJul 215.6 kWhDec 273.0 kWhDec 273.0 kWhJun 185.1 kWhJun 185.1 kWhSep 245.0 kWhSep 245.0 kWhFeb 33.5 kWhFeb 33.5 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 Okinoerabu Airport are 27.433 deg latitude, 128.705 deg longitude, and 0 ft elevation.

The topography within 2 miles of Okinoerabu Airport contains only modest variations in elevation, with a maximum elevation change of 233 feet and an average elevation above sea level of 25 feet. Within 10 miles contains only modest variations in elevation (810 feet). Within 50 miles contains significant variations in elevation (2,110 feet).

The area within 2 miles of Okinoerabu Airport is covered by water (90%), within 10 miles by water (95%), and within 50 miles by water (99%).

Data Sources

This report illustrates the typical weather at Okinoerabu Airport, 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

Okinoerabu Airport 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, Marine Corps Air Station Futenma, and Naha 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.