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Average Weather at Minamidaitojima Japan

At Minamidaitojima, the summers are hot, oppressive, wet, and overcast; the winters are comfortable and partly cloudy; and it is windy year round. Over the course of the year, the temperature typically varies from 60°F to 89°F and is rarely below 52°F or above 91°F.

Climate Summary

66%66%18%18%overcastclearprecipitation: 8.7 inprecipitation: 8.7 in1.7 in1.7 inmuggy: 100%muggy: 100%5%5%drydrycomfortablewarmhotwarmtourism score: 7.5tourism score: 7.52.72.7JanFebMarAprMayJunJulAugSepOctNovDec
Click on each chart for more information.

Based on the tourism score, the best times of year to visit Minamidaitojima for warm-weather activities are from mid February to mid April and from late October to mid January.

Temperature

The hot season lasts for 3.8 months, from June 15 to October 7, with an average daily high temperature above 85°F. The hottest day of the year is July 17, with an average high of 89°F and low of 80°F.

The cool season lasts for 3.3 months, from December 12 to March 21, with an average daily high temperature below 72°F. The coldest day of the year is January 24, with an average low of 60°F and high of 68°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 MinamidaitojimaJanFebMarAprMayJunJulAugSepOctNovDec12 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 Minamidaitojima, 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 Minamidaitojima begins around September 15 and lasts for 7.2 months, ending around April 21. On January 3, 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 21 and lasts for 4.8 months, ending around September 15. On June 6, the cloudiest day of the year, the sky is overcast or mostly cloudy 82% of the time, and clear, mostly clear, or partly cloudy 18% of the time.

Cloud Cover Categories

Cloud Cover Categories at MinamidaitojimaclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jan 366%Jan 366%Jun 618%Jun 618%Sep 1541%Sep 1541%Apr 2142%Apr 2142%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 Minamidaitojima varies significantly throughout the year.

The wetter season lasts 10 months, from August 12 to June 19, with a greater than 37% chance of a given day being a wet day. The chance of a wet day peaks at 54% on May 31.

The drier season lasts 1.8 months, from June 19 to August 12. The smallest chance of a wet day is 21% on July 9.

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 54% on May 31.

Daily Chance of Precipitation

Daily Chance of Precipitation at MinamidaitojimawetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%May 3154%May 3154%Jul 921%Jul 921%Jan 122%Jan 122%Aug 1237%Aug 1237%Jun 1937%Jun 1937%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. Minamidaitojima experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year at Minamidaitojima. The most rain falls during the 31 days centered around June 1, with an average total accumulation of 8.7 inches.

The least rain falls around January 15, with an average total accumulation of 1.7 inches.

Average Monthly Rainfall

Average Monthly Rainfall at MinamidaitojimaJanFebMarAprMayJunJulAugSepOctNovDec0 in2 in4 in6 in8 in10 in12 in14 in16 inJun 18.7 inJun 18.7 inJan 151.7 inJan 151.7 inAug 86.2 inAug 86.2 in
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 Minamidaitojima varies over the course of the year. In 2017, the shortest day is December 22, with 10 hours, 31 minutes of daylight; the longest day is June 21, with 13 hours, 45 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at MinamidaitojimaJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2013 hr, 45 minJun 2113 hr, 45 minJun 2112 hr, 8 minSep 2312 hr, 8 minSep 2310 hr, 31 minDec 2210 hr, 31 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 5:22 AM on June 9, and the latest sunrise is 1 hour, 41 minutes later at 7:03 AM on January 13. The earliest sunset is at 5:23 PM on November 30, and the latest sunset is 1 hour, 47 minutes later at 7:10 PM on July 3.

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

Sunrise & Sunset with Twilight

Sunrise & Sunset with Twilight at MinamidaitojimaJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 95:22 AMJun 95:22 AM7:10 PMJul 37:10 PMJul 3Nov 305:23 PMNov 305:23 PM7:03 AMJan 137:03 AMJan 13daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
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.

Minamidaitojima experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 8.3 months, from March 21 to November 29, during which time the comfort level is muggy, oppressive, or miserable at least 29% of the time. The muggiest day of the year is July 28, with muggy conditions 100% of the time.

The least muggy day of the year is January 24, with muggy conditions 5% of the time.

Humidity Comfort Levels

Humidity Comfort Levels at MinamidaitojimamuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jan 245%Jan 245%100%Jul 28100%Jul 28Mar 2129%Mar 2129%Nov 2929%Nov 2929%drydrymiserablemiserablecomfortablecomfortablemuggymuggyhumidhumid
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 Minamidaitojima experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.6 months, from September 28 to March 16, with average wind speeds of more than 14.1 miles per hour. The windiest day of the year is December 3, with an average hourly wind speed of 16.3 miles per hour.

The calmer time of year lasts for 6.4 months, from March 16 to September 28. The calmest day of the year is July 9, with an average hourly wind speed of 11.8 miles per hour.

Average Wind Speed

Average Wind Speed at MinamidaitojimawindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mph16 mph18 mph20 mph22 mph24 mphDec 316.3 mphDec 316.3 mphJul 911.8 mphJul 911.8 mphSep 2814.1 mphSep 2814.1 mphMar 1614.1 mphMar 1614.1 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 Minamidaitojima varies throughout the year.

The wind is most often from the east for 1.4 months, from April 1 to May 12 and for 3.8 months, from July 19 to November 14, with a peak percentage of 49% on September 29. The wind is most often from the south for 2.2 months, from May 12 to July 19, with a peak percentage of 62% on June 25. The wind is most often from the north for 4.6 months, from November 14 to April 1, with a peak percentage of 60% on January 1.

Wind Direction

Wind Direction at MinamidaitojimaNESENJanFebMarAprMayJunJulAugSepOctNovDec0%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

Minamidaitojima 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 3.7 months, from June 24 to October 13, with an average temperature above 81°F. The day of the year with the warmest water is July 22, with an average temperature of 84°F.

The time of year with cooler water lasts for 3.6 months, from January 3 to April 22, with an average temperature below 73°F. The day of the year with the coolest water is February 28, 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.

Best Time of Year to Visit

To characterize how pleasant the weather is at Minamidaitojima 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 times of year to visit Minamidaitojima for general outdoor tourist activities are from mid February to mid April and from late October to mid January, with a peak score in the third week of November.

Tourism Score

Tourism Score at Minamidaitojimabest timebest timeJanFebMarAprMayJunJulAugSepOctNovDec02468107.57.52.72.77.17.16.66.6 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 Minamidaitojima for hot-weather activities is from mid September to mid November, with a peak score in the second week of October.

Beach/Pool Score

Beach/Pool Score at Minamidaitojimabest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.96.91.11.15.25.25.05.04.64.6 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/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 Minamidaitojima 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 MinamidaitojimaJanFebMarAprMayJunJulAugSepOctNovDec0%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 3coolcomfortablewarmhotcold
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 MinamidaitojimaJanFebMarAprMayJunJulAugSepOctNovDec0°F1,000°F2,000°F3,000°F4,000°F5,000°F6,000°F7,000°F8,000°F9,000°FMar 2900°FMar 2900°FApr 191,800°FApr 191,800°FDec 318,856°FDec 318,856°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 2.6 months, from March 16 to June 4, with an average daily incident shortwave energy per square meter above 5.2 kWh. The brightest day of the year is May 1, with an average of 5.7 kWh.

The darker period of the year lasts for 2.3 months, from November 20 to January 28, with an average daily incident shortwave energy per square meter below 3.7 kWh. The darkest day of the year is December 22, with an average of 3.2 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at MinamidaitojimabrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWhMay 15.7 kWhMay 15.7 kWhDec 223.2 kWhDec 223.2 kWhMar 165.2 kWhMar 165.2 kWhJun 45.2 kWhJun 45.2 kWhJan 283.7 kWhJan 283.7 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 Minamidaitojima are 25.847 deg latitude, 131.263 deg longitude, and 0 ft elevation.

The topography within 2 miles of Minamidaitojima contains only modest variations in elevation, with a maximum elevation change of 233 feet and an average elevation above sea level of 43 feet. Within 10 miles also contains only modest variations in elevation (236 feet). Within 50 miles also contains only modest variations in elevation (230 feet).

The area within 2 miles of Minamidaitojima is covered by water (61%) and cropland (37%), within 10 miles by water (98%), and within 50 miles by water (100%).

Data Sources

This report illustrates the typical weather at Minamidaitojima, 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

Minamidaitojima 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.

There are no other weather stations in our network within 200 kilometers of this location. Consequently, in the case of missing or erroneous measurements from this station, we fall back on NASA's MERRA-2 modern-era reanalysis , adjusted according to typical seasonal and diurnal differences between this station and the wide-area MERRA-2 reconstructed values.

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.