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Average Weather in Hiratachō Japan

In Hiratachō, the summers are short, warm, oppressive, and mostly cloudy; the winters are very cold, windy, and partly cloudy; and it is wet year round. Over the course of the year, the temperature typically varies from 37°F to 86°F and is rarely below 32°F or above 91°F.

Climate Summary

coldcoolcomfortablewarmhotwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDec67%67%31%31%overcastclearprecipitation: 8.8 inprecipitation: 8.8 in2.8 in2.8 inmuggy: 98%muggy: 98%0%0%drydrytourism score: 6.7tourism score: 6.70.10.1
Click on each chart for more information.

Based on the tourism score, the best times of year to visit Hiratachō for warm-weather activities are from late May to mid June and from late August to mid October.

Temperature

The hot season lasts for 2.7 months, from June 29 to September 19, with an average daily high temperature above 77°F. The hottest day of the year is August 6, with an average high of 86°F and low of 76°F.

The cool season lasts for 3.4 months, from December 7 to March 19, with an average daily high temperature below 53°F. The coldest day of the year is January 27, with an average low of 37°F and high of 45°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 in HiratachōJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMvery coldcoldcoldcoolcoolwarmcomfortablecoldcomfortablevery coldvery cold
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.

İstanbul, Turkey (5,293 miles away) and Zyrya, Azerbaijan (4,348 miles) are the far-away foreign places with temperatures most similar to Hiratachō (view comparison).

Clouds

In Hiratachō, 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 in Hiratachō begins around September 5 and lasts for 7.8 months, ending around April 30. On October 24, 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 30 and lasts for 4.2 months, ending around September 5. On July 2, the cloudiest day of the year, the sky is overcast or mostly cloudy 69% of the time, and clear, mostly clear, or partly cloudy 31% of the time.

Cloud Cover Categories

Cloud Cover Categories in HiratachōclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 2467%Oct 2467%Jul 231%Jul 231%Sep 549%Sep 549%Apr 3050%Apr 3050%clearpartly cloudymostly cloudyovercastmostly clear
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 in Hiratachō varies throughout the year.

The wetter season lasts 3.2 months, from June 15 to September 21, with a greater than 40% chance of a given day being a wet day. The chance of a wet day peaks at 53% on July 3.

The drier season lasts 8.8 months, from September 21 to June 15. The smallest chance of a wet day is 27% on October 24.

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 53% on July 3.

Daily Chance of Precipitation

Daily Chance of Precipitation in HiratachōwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jul 353%Jul 353%Oct 2427%Oct 2427%Jan 134%Jan 134%Jun 1540%Jun 1540%Sep 2140%Sep 2140%rainmixed
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. Hiratachō experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in Hiratachō. The most rain falls during the 31 days centered around July 1, with an average total accumulation of 8.8 inches.

The least rain falls around January 30, with an average total accumulation of 2.7 inches.

Average Monthly Rainfall

Average Monthly Rainfall in HiratachōJanFebMarAprMayJunJulAugSepOctNovDec0 in2 in4 in6 in8 in10 in12 in14 in16 inJul 18.8 inJul 18.8 inJan 302.7 inJan 302.7 inSep 136.1 inSep 136.1 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 in Hiratachō varies significantly over the course of the year. In 2018, the shortest day is December 22, with 9 hours, 46 minutes of daylight; the longest day is June 21, with 14 hours, 33 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in HiratachōJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2112 hr, 7 minMar 2114 hr, 33 minJun 2114 hr, 33 minJun 2112 hr, 10 minSep 2312 hr, 10 minSep 239 hr, 46 minDec 229 hr, 46 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 4:52 AM on June 13, and the latest sunrise is 2 hours, 25 minutes later at 7:18 AM on January 7. The earliest sunset is at 4:55 PM on December 6, and the latest sunset is 2 hours, 32 minutes later at 7:27 PM on June 29.

Daylight saving time (DST) is not observed in Hiratachō during 2018.

Sunrise & Sunset with Twilight

Sunrise & Sunset with Twilight in HiratachōJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 134:52 AMJun 134:52 AM7:27 PMJun 297:27 PMJun 29Dec 64:55 PMDec 64:55 PM7:18 AMJan 77:18 AMJan 7daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2018. 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.

Hiratachō experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.6 months, from June 10 to September 30, during which time the comfort level is muggy, oppressive, or miserable at least 25% of the time. The muggiest day of the year is August 6, with muggy conditions 98% of the time.

The least muggy day of the year is December 13, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels in HiratachōmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Dec 130%Dec 130%98%Aug 698%Aug 6Jun 1025%Jun 1025%Sep 3025%Sep 3025%miserablemiserableoppressiveoppressivedrydryhumidhumid
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 in Hiratachō experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.5 months, from October 28 to April 14, with average wind speeds of more than 12.8 miles per hour. The windiest day of the year is December 26, with an average hourly wind speed of 16.1 miles per hour.

The calmer time of year lasts for 6.5 months, from April 14 to October 28. The calmest day of the year is June 15, with an average hourly wind speed of 9.6 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 in Hiratachō varies throughout the year.

The wind is most often from the west for 1.9 months, from June 7 to August 3 and for 7.2 months, from October 25 to June 1, with a peak percentage of 38% on July 11. The wind is most often from the east for 1.8 months, from August 14 to October 7, with a peak percentage of 36% on September 26. The wind is most often from the north for 2.6 weeks, from October 7 to October 25, with a peak percentage of 34% on October 7.

Wind Direction

Wind Direction in HiratachōWWSENWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsoutheastnorth
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

Hiratachō 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 significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.4 months, from July 16 to September 30, with an average temperature above 75°F. The day of the year with the warmest water is August 17, with an average temperature of 80°F.

The time of year with cooler water lasts for 4.0 months, from January 1 to May 2, with an average temperature below 60°F. The day of the year with the coolest water is March 1, with an average temperature of 54°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 in Hiratachō 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 Hiratachō for general outdoor tourist activities are from late May to mid June and from late August to mid October, with a peak score in the last week of September.

Tourism Score

Tourism Score in Hiratachōbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.76.70.10.16.26.25.45.4 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 Hiratachō for hot-weather activities is from mid July to early September, with a peak score in the second week of August.

Beach/Pool Score

Beach/Pool Score in Hiratachōbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.66.60.00.0 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).

The growing season in Hiratachō typically lasts for 10 months (314 days), from around February 20 to around January 1, rarely starting after March 17, or ending before December 17.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Hiratachōgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Feb 2050%Feb 2050%Jan 150%Jan 190%Mar 1790%Mar 1790%Dec 1790%Dec 1714%Jan 1614%Jan 16Jul 29100%Jul 29100%very coldcoldcoolcomfortablewarmhotfreezing
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.

Based on growing degree days alone, the first spring blooms in Hiratachō should appear around April 4, only rarely appearing before March 22 or after April 15.

Growing Degree Days

Growing Degree Days in HiratachōJanFebMarAprMayJunJulAugSepOctNovDec0°F500°F1,000°F1,500°F2,000°F2,500°F3,000°F3,500°F4,000°F4,500°FApr 480°FApr 480°FJun 12900°FJun 12900°FJul 201,800°FJul 201,800°FDec 314,396°FDec 314,396°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 significant seasonal variation over the course of the year.

The brighter period of the year lasts for 4.3 months, from April 16 to August 24, with an average daily incident shortwave energy per square meter above 5.5 kWh. The brightest day of the year is June 1, with an average of 6.3 kWh.

The darker period of the year lasts for 2.9 months, from November 13 to February 11, with an average daily incident shortwave energy per square meter below 2.9 kWh. The darkest day of the year is December 26, with an average of 2.0 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in HiratachōbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhJun 16.3 kWhJun 16.3 kWhDec 262.0 kWhDec 262.0 kWhApr 165.5 kWhApr 165.5 kWhAug 245.5 kWhAug 245.5 kWhFeb 112.9 kWhFeb 112.9 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 Hiratachō are 35.433 deg latitude, 132.817 deg longitude, and 16 ft elevation.

The topography within 2 miles of Hiratachō contains very significant variations in elevation, with a maximum elevation change of 1,253 feet and an average elevation above sea level of 67 feet. Within 10 miles also contains very significant variations in elevation (1,719 feet). Within 50 miles contains very significant variations in elevation (5,577 feet).

The area within 2 miles of Hiratachō is covered by cropland (69%) and trees (22%), within 10 miles by water (47%) and trees (35%), and within 50 miles by water (66%) and trees (31%).

Data Sources

This report illustrates the typical weather in Hiratachō, 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

There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Hiratachō.

For each station, the records are corrected for the elevation difference between that station and Hiratachō according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Hiratachō is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Hiratachō and a given station.

The stations contributing to this reconstruction are: Miho–Yonago Airport (84%, 39 kilometers, east) and Hiroshima Airport (16%, 111 kilometers, south).

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.