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Average Weather at Kumejima Airport Japan

At Kumejima Airport, the summers are hot, oppressive, wet, windy, and overcast and the winters are cool, extremely windy, and partly cloudy. 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.

Climate Summary

66%66%19%19%overcastprecipitation: 10.3 inprecipitation: 10.3 in1.6 in1.6 inmuggy: 100%muggy: 100%3%3%drydrycomfortablewarmhotwarmtourism score: 7.5tourism score: 7.52.52.5JanFebMarAprMayJunJulAugSepOctNovDec
Click on each chart for more information.

Based on the tourism score, the best time of year to visit Kumejima Airport for warm-weather activities is from mid October to late December.

Temperature

The hot season lasts for 3.5 months, from June 13 to September 29, with an average daily high temperature above 84°F. The hottest day of the year is July 19, 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 Kumejima AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMhotcoolwarmcomfortable
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < very cold < 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 Kumejima 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 Kumejima Airport begins around September 12 and lasts for 7.1 months, ending around April 16. On October 26, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 66% of the time, and overcast or mostly cloudy 34% of the time.

The cloudier part of the year begins around April 16 and lasts for 4.9 months, ending around September 12. 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 Kumejima AirportclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 2666%Oct 2666%Jun 1619%Jun 1619%Sep 1242%Sep 1242%Apr 1643%Apr 1643%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 Kumejima Airport varies significantly throughout the year.

The wetter season lasts 3.5 months, from March 13 to June 27, 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 5.

The drier season lasts 8.5 months, from June 27 to March 13. 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 5.

Daily Chance of Precipitation

Daily Chance of Precipitation at Kumejima AirportwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jun 558%Jun 558%Dec 1722%Dec 1722%Mar 1340%Mar 1340%Jun 2740%Jun 2740%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. Kumejima Airport experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year at Kumejima Airport. The most rain falls during the 31 days centered around June 3, with an average total accumulation of 10.3 inches.

The least rain falls around December 28, with an average total accumulation of 1.6 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 Kumejima Airport varies over the course of the year. In 2017, the shortest day is December 22, 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

Hours of Daylight and Twilight at Kumejima AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2013 hr, 48 minJun 2113 hr, 48 minJun 2112 hr, 8 minSep 2312 hr, 8 minSep 2310 hr, 29 minDec 2210 hr, 29 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 5:39 AM on June 9, and the latest sunrise is 1 hour, 43 minutes later at 7:22 AM on January 12. The earliest sunset is at 5:40 PM on November 30, and the latest sunset is 1 hour, 50 minutes later at 7:29 PM on July 2.

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

Sunrise & Sunset with Twilight

Sunrise & Sunset with Twilight at Kumejima AirportJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 95:39 AMJun 95:39 AM7:29 PMJul 27:29 PMJul 2Nov 305:40 PMNov 305:40 PM7:22 AMJan 127:22 AMJan 12daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
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.

Kumejima Airport experiences extreme 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 25, with muggy conditions 100% of the time.

The least muggy day of the year is January 13, with muggy conditions 3% of the time.

Humidity Comfort Levels

Humidity Comfort Levels at Kumejima AirportmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jan 133%Jan 133%100%Jul 25100%Jul 25Mar 2628%Mar 2628%Nov 2228%Nov 2228%drydrymiserablemiserablecomfortablecomfortablehumidhumidmuggymuggyoppressiveoppressive
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 Kumejima Airport experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.9 months, from September 27 to March 24, with average wind speeds of more than 15.2 miles per hour. The windiest day of the year is December 2, with an average hourly wind speed of 17.6 miles per hour.

The calmer time of year lasts for 6.1 months, from March 24 to September 27. The calmest day of the year is May 22, with an average hourly wind speed of 12.8 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 Kumejima Airport varies throughout the year.

The wind is most often from the east for 4.0 days, from April 18 to April 22; for 3.0 weeks, from May 5 to May 26; and for 1.8 months, from August 8 to October 1, with a peak percentage of 44% on September 27. The wind is most often from the south for 1.9 weeks, from April 22 to May 5 and for 2.4 months, from May 26 to August 8, with a peak percentage of 70% on June 29. The wind is most often from the north for 6.6 months, from October 1 to April 18, with a peak percentage of 63% on January 1.

Wind Direction

Wind Direction at Kumejima AirportNSESENJanFebMarAprMayJunJulAugSepOctNovDec0%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

Kumejima 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 3.3 months, from June 23 to October 1, with an average temperature above 82°F. The day of the year with the warmest water is July 29, with an average temperature of 84°F.

The time of year with cooler water lasts for 3.5 months, from December 29 to April 14, with an average temperature below 74°F. The day of the year with the coolest water is February 16, 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.

Best Time of Year to Visit

To characterize how pleasant the weather is at Kumejima Airport throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Kumejima Airport for general outdoor tourist activities is from mid October to late December, with a peak score in the last week of October.

Tourism Score

Tourism Score at Kumejima Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468107.57.52.52.56.46.45.75.7 precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Kumejima Airport for hot-weather activities is from mid September to early November, with a peak score in the second week of October.

Beach/Pool Score

Beach/Pool Score at Kumejima Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468107.17.10.80.85.05.04.44.4precipitationprecipitationcloudscloudstemperaturetemperaturebeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Growing Season

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Temperatures at Kumejima Airport are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season at Kumejima AirportJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%100%Jan 1100%Jan 1100%Jul 3100%Jul 3coldcoolcomfortablewarmhot
The percentage of time spent in various temperature bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Growing Degree Days

Growing Degree Days at Kumejima AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F1,000°F2,000°F3,000°F4,000°F5,000°F6,000°F7,000°F8,000°FMar 11900°FMar 11900°FApr 281,800°FApr 281,800°FDec 318,496°FDec 318,496°F
The average growing degree days accumulated over the course of the year, 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 3.5 months, from June 18 to October 2, with an average daily incident shortwave energy per square meter above 5.0 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 21 to February 5, with an average daily incident shortwave energy per square meter below 3.5 kWh. The darkest day of the year is December 30, with an average of 3.0 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at Kumejima AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWhJul 225.5 kWhJul 225.5 kWhDec 303.0 kWhDec 303.0 kWhJun 185.0 kWhJun 185.0 kWhOct 25.0 kWhOct 25.0 kWhFeb 53.5 kWhFeb 53.5 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 Kumejima Airport are 26.364 deg latitude, 126.714 deg longitude, and 0 ft elevation.

The topography within 2 miles of Kumejima Airport contains only modest variations in elevation, with a maximum elevation change of 256 feet and an average elevation above sea level of 24 feet. Within 10 miles contains only modest variations in elevation (1,027 feet). Within 50 miles also contains very significant variations in elevation (1,004 feet).

The area within 2 miles of Kumejima Airport is covered by water (75%) and trees (13%), within 10 miles by water (94%), and within 50 miles by water (100%).

Data Sources

This report illustrates the typical weather at Kumejima 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

Kumejima 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 Naha Airport, Marine Corps Air Station Futenma, and Kadena Air Base.

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.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.