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Climate and Average Weather Year Round at Akita Airport Japan

At Akita Airport, the summers are warm, muggy, and wet; the winters are very cold, snowy, and windy; and it is mostly cloudy year round. Over the course of the year, the temperature typically varies from 26°F to 83°F and is rarely below 20°F or above 90°F.

Based on the tourism score, the best time of year to visit Akita Airport for warm-weather activities is from mid June to mid September.

Climate at Akita Airport

very coldcoldcoolcomfortablewarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow60%60%20%20%overcastclearprecipitation: 6.1 inprecipitation: 6.1 in2.0 in2.0 inmuggy: 81%muggy: 81%0%0%drydrytourism score: 6.4tourism score: 6.40.00.0
Akita Airport weather by month. Click on each chart for more information.

The warm season lasts for 3.1 months, from June 15 to September 19, with an average daily high temperature above 73°F. The hottest month of the year at Akita Airport is August, with an average high of 82°F and low of 69°F.

The cold season lasts for 3.5 months, from December 1 to March 18, with an average daily high temperature below 44°F. The coldest month of the year at Akita Airport is January, with an average low of 27°F and high of 35°F.

Average High and Low Temperature at Akita Airport

Average High and Low Temperature at Akita AirportwarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 2534°FJan 2534°FAug 783°FAug 783°F26°F26°F71°F71°FJun 1573°FJun 1573°FSep 1973°FSep 1973°FDec 144°FDec 144°FMar 1844°FMar 1844°F61°F61°F59°F59°F34°F34°F32°F32°FNowNow
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.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 35°F36°F44°F56°F66°F73°F79°F82°F75°F63°F51°F40°F
Temp. 30°F31°F37°F49°F58°F66°F73°F76°F68°F56°F44°F35°F
Low 27°F27°F32°F42°F52°F61°F68°F69°F61°F49°F38°F31°F

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 at Akita Airport

Average Hourly Temperature at Akita AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNowNowfreezingfreezingvery coldvery coldcoldcoldcoolcoolcomfortablewarmfreezing
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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Fairport Harbor, Ohio, United States (6,249 miles away) and Boston, Massachusetts, United States (6,451 miles) are the far-away foreign places with temperatures most similar to Akita Airport (view comparison).

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At Akita 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 Akita Airport begins around March 7 and lasts for 8.8 months, ending around December 1.

The clearest month of the year at Akita Airport is October, during which on average the sky is clear, mostly clear, or partly cloudy 58% of the time.

The cloudier part of the year begins around December 1 and lasts for 3.2 months, ending around March 7.

The cloudiest month of the year at Akita Airport is January, during which on average the sky is overcast or mostly cloudy 78% of the time.

Cloud Cover Categories at Akita Airport

Cloud Cover Categories at Akita AirportclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 2260%Oct 2260%Jan 1920%Jan 1920%Mar 740%Mar 740%Dec 140%Dec 140%NowNowclearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier 78%73%56%52%55%55%58%54%51%42%50%67%
Clearer 22%27%44%48%45%45%42%46%49%58%50%33%

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Akita Airport varies throughout the year.

The wetter season lasts 6.4 months, from June 22 to January 4, with a greater than 39% chance of a given day being a wet day. The month with the most wet days at Akita Airport is November, with an average of 14.7 days with at least 0.04 inches of precipitation.

The drier season lasts 5.6 months, from January 4 to June 22. The month with the fewest wet days at Akita Airport is February, with an average of 9.0 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone at Akita Airport is November, with an average of 13.9 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 48% on November 11.

Daily Chance of Precipitation at Akita Airport

Daily Chance of Precipitation at Akita AirportwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Nov 2550%Nov 2550%May 2329%May 2329%Jan 439%Jan 439%NowNowsnowmixedrain
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).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain 4.6d4.5d8.1d9.9d9.7d10.6d13.0d12.1d13.2d13.4d13.9d9.7d
Mixed 3.5d2.4d1.2d0.1d0.0d0.0d0.0d0.0d0.0d0.0d0.6d2.8d
Snow 2.6d2.1d0.6d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.2d1.7d
Any 10.7d9.0d9.9d10.1d9.7d10.6d13.0d12.1d13.2d13.4d14.7d14.2d

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. Akita Airport experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year at Akita Airport. The month with the most rain at Akita Airport is July, with an average rainfall of 5.9 inches.

The month with the least rain at Akita Airport is February, with an average rainfall of 1.6 inches.

Average Monthly Rainfall at Akita Airport

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 snowfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 1.8″1.6″2.4″3.4″3.5″4.4″5.9″5.7″5.7″4.6″4.6″3.1″

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Akita Airport experiences significant seasonal variation in monthly snowfall.

The snowy period of the year lasts for 4.1 months, from November 19 to March 22, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow at Akita Airport is January, with an average snowfall of 5.7 inches.

The snowless period of the year lasts for 7.9 months, from March 22 to November 19. The least snow falls around July 30, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall at Akita Airport

Average Monthly Snowfall at Akita AirportsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 inJan 125.8 inJan 125.8 inJul 300.0 inJul 300.0 inNov 191.0 inNov 191.0 inMar 221.0 inMar 221.0 in
The average snowfall (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 rainfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Snowfall 5.7″4.4″1.5″0.1″0.0″0.0″0.0″0.0″0.0″0.0″0.7″4.3″

The length of the day at Akita Airport varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 22 minutes of daylight; the longest day is June 21, with 14 hours, 59 minutes of daylight.

Hours of Daylight and Twilight at Akita Airport

Hours of Daylight and Twilight at Akita AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 2012 hr, 8 minMar 2014 hr, 58 minJun 2114 hr, 58 minJun 2112 hr, 10 minSep 2212 hr, 10 minSep 229 hr, 22 minDec 219 hr, 22 minDec 21nightnightdayNowNow
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.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 9.7h10.7h12.0h13.3h14.4h14.9h14.6h13.7h12.4h11.1h10.0h9.4h

The earliest sunrise is at 4:10 AM on June 14, and the latest sunrise is 2 hours, 49 minutes later at 7:00 AM on January 5. The earliest sunset is at 4:14 PM on December 8, and the latest sunset is 2 hours, 56 minutes later at 7:10 PM on June 27.

Daylight saving time (DST) is not observed at Akita Airport during 2024.

Sunrise & Sunset with Twilight at Akita Airport

Sunrise & Sunset with Twilight at Akita AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PMJun 144:10 AMJun 144:10 AM7:10 PMJun 277:10 PMJun 27Dec 84:14 PMDec 84:14 PM7:00 AMJan 57:00 AMJan 5daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2024. 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.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth at Akita Airport

Solar Elevation and Azimuth at Akita AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AM000010101010202020203030303040404050506060700000101010102020202030303040405050602774NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

Moon Rise, Set & Phases at Akita Airport

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

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.

Akita Airport experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 2.8 months, from June 24 to September 18, during which time the comfort level is muggy, oppressive, or miserable at least 20% of the time. The month with the most muggy days at Akita Airport is August, with 22.6 days that are muggy or worse.

The least muggy day of the year is March 4, when muggy conditions are essentially unheard of.

Humidity Comfort Levels at Akita Airport

Humidity Comfort Levels at Akita AirportmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Mar 40%Mar 40%81%Aug 781%Aug 7Jun 2420%Jun 2420%Sep 1820%Sep 1820%NowNowoppressiveoppressivemuggymuggyhumidhumiddrydrycomfortablecomfortable
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days 0.0d0.0d0.0d0.0d0.1d3.5d18.1d22.6d7.9d0.3d0.0d0.0d

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 Akita Airport experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.0 months, from November 10 to April 9, with average wind speeds of more than 8.9 miles per hour. The windiest month of the year at Akita Airport is January, with an average hourly wind speed of 12.1 miles per hour.

The calmer time of year lasts for 7.0 months, from April 9 to November 10. The calmest month of the year at Akita Airport is July, with an average hourly wind speed of 5.5 miles per hour.

Average Wind Speed at Akita Airport

Average Wind Speed at Akita AirportwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mphFeb 712.4 mphFeb 712.4 mphJul 295.4 mphJul 295.4 mphNov 108.9 mphNov 108.9 mphApr 98.9 mphApr 98.9 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph) 12.112.110.68.66.95.75.55.76.47.89.311.0

The predominant average hourly wind direction at Akita Airport varies throughout the year.

The wind is most often from the south for 1.3 weeks, from July 25 to August 3, with a peak percentage of 34% on July 27. The wind is most often from the west for 4.3 weeks, from August 3 to September 2 and for 11 months, from September 5 to July 25, with a peak percentage of 32% on August 8. The wind is most often from the east for 3.0 days, from September 2 to September 5, with a peak percentage of 30% on September 2.

Wind Direction at Akita Airport

Wind Direction at Akita AirportWWWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Akita 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 significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.7 months, from July 15 to October 4, with an average temperature above 71°F. The month of the year at Akita Airport with the warmest water is August, with an average temperature of 77°F.

The time of year with cooler water lasts for 4.0 months, from January 4 to May 5, with an average temperature below 53°F. The month of the year at Akita Airport with the coolest water is March, with an average temperature of 47°F.

Average Water Temperature at Akita Airport

Average Water Temperature at Akita AirportwarmcoolJanFebMarAprMayJunJulAugSepOctNovDec40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°FAug 2178°FAug 2178°F47°FMar 847°FMar 8Jul 1571°FJul 1571°FOct 471°FOct 471°FJan 453°FJan 453°FMay 553°FMay 553°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 52°F48°F47°F50°F56°F65°F72°F77°F75°F69°F63°F57°F

To characterize how pleasant the weather is at Akita 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 Akita Airport for general outdoor tourist activities is from mid June to mid September, with a peak score in the second week of August.

Tourism Score at Akita Airport

Tourism Score at Akita Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.46.40.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationtourism 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 Akita Airport for hot-weather activities is from late July to late August, with a peak score in the first week of August.

Beach/Pool Score at Akita Airport

Beach/Pool Score at Akita AirportJanFebMarAprMayJunJulAugSepOctNovDec002244668810105.75.70.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationbeach/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.

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 at Akita Airport typically lasts for 7.6 months (233 days), from around April 2 to around November 20, rarely starting before March 16 or after April 19, and rarely ending before November 4 or after December 7.

Time Spent in Various Temperature Bands and the Growing Season at Akita Airport

Time Spent in Various Temperature Bands and the Growing Season at Akita Airportgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Apr 250%Apr 250%Nov 2050%Nov 2090%Apr 1990%Apr 1990%Nov 490%Nov 410%Mar 1610%Mar 1610%Dec 710%Dec 70%Jan 290%Jan 29Jul 28100%Jul 28100%freezingvery coldcoldcoolcomfortablewarmhot
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 percentage of time spent in various temperature bands. 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 at Akita Airport should appear around April 30, only rarely appearing before April 21 or after May 9.

Growing Degree Days at Akita Airport

Growing Degree Days at Akita AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°F3,000°F3,000°FApr 3089°FApr 3089°FJul 3900°FJul 3900°FAug 101,800°FAug 101,800°FDec 313,105°FDec 313,105°F
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

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 4.1 months, from April 18 to August 22, with an average daily incident shortwave energy per square meter above 5.2 kWh. The brightest month of the year at Akita Airport is June, with an average of 6.1 kWh.

The darker period of the year lasts for 3.2 months, from November 8 to February 15, with an average daily incident shortwave energy per square meter below 2.3 kWh. The darkest month of the year at Akita Airport is December, with an average of 1.4 kWh.

Average Daily Incident Shortwave Solar Energy at Akita Airport

Average Daily Incident Shortwave Solar Energy at Akita AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJun 26.2 kWhJun 26.2 kWhDec 251.3 kWhDec 251.3 kWhApr 185.2 kWhApr 185.2 kWhAug 225.2 kWhAug 225.2 kWhFeb 152.3 kWhFeb 152.3 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 1.52.33.75.15.86.15.85.44.33.32.01.4

This report illustrates the typical weather at Akita 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

Akita 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 Hachinohe Ab, Matsushima Ab, and Misawa 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 Algorithms 2nd Edition , 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 airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

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.

Please review our full terms contained on our Terms of Service page.