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Climate and Average Weather Year Round at Yokota Air Base Japan

At Yokota Air Base, the summers are short, warm, muggy, wet, and mostly cloudy and the winters are very cold and mostly clear. Over the course of the year, the temperature typically varies from 30°F to 87°F and is rarely below 24°F or above 94°F.

Based on the tourism score, the best time of year to visit Yokota Air Base for warm-weather activities is from late July to early October.

Climate at Yokota Air Base

coldcoolcomfortablewarmhotwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow76%76%27%27%clearovercastprecipitation: 7.3 inprecipitation: 7.3 in1.5 in1.5 inmuggy: 89%muggy: 89%0%0%drydrytourism score: 6.2tourism score: 6.20.00.0
Yokota Air Base weather by month. Click on each chart for more information.

The hot season lasts for 2.6 months, from June 26 to September 15, with an average daily high temperature above 79°F. The hottest month of the year at Yokota Air Base is August, with an average high of 86°F and low of 72°F.

The cold season lasts for 3.5 months, from December 1 to March 18, with an average daily high temperature below 56°F. The coldest month of the year at Yokota Air Base is January, with an average low of 30°F and high of 48°F.

Average High and Low Temperature at Yokota Air Base

Average High and Low Temperature at Yokota Air BasehotcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 2048°FJan 2048°FAug 687°FAug 687°F30°F30°F73°F73°FJun 2679°FJun 2679°FSep 1579°FSep 1579°FDec 156°FDec 156°FMar 1856°FMar 1856°F67°F67°F67°F67°F38°F38°F38°F38°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 48°F49°F55°F65°F73°F77°F84°F86°F79°F69°F60°F52°F
Temp. 38°F40°F46°F56°F64°F70°F76°F79°F72°F62°F52°F43°F
Low 30°F32°F38°F48°F57°F64°F71°F72°F66°F55°F44°F35°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 Yokota Air Base

Average Hourly Temperature at Yokota Air BaseJanFebMarAprMayJunJulAugSepOctNovDec12 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 AMNowNowvery coldvery coldvery coldcoldcoldcoolcoolcomfortablewarmhotfreezingvery coldwarm
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.

Chincoteague, Virginia, United States (6,890 miles away) and Lankaran, Azerbaijan (4,765 miles) are the far-away foreign places with temperatures most similar to Yokota Air Base (view comparison).

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At Yokota Air Base, 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 Yokota Air Base begins around October 6 and lasts for 5.7 months, ending around March 30.

The clearest month of the year at Yokota Air Base is December, during which on average the sky is clear, mostly clear, or partly cloudy 75% of the time.

The cloudier part of the year begins around March 30 and lasts for 6.3 months, ending around October 6.

The cloudiest month of the year at Yokota Air Base is June, during which on average the sky is overcast or mostly cloudy 69% of the time.

Cloud Cover Categories at Yokota Air Base

Cloud Cover Categories at Yokota Air BaseclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Dec 2676%Dec 2676%Jun 2627%Jun 2627%Oct 651%Oct 651%Mar 3052%Mar 3052%NowNowclearmostly clearpartly 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 27%35%44%52%58%69%66%53%53%43%34%25%
Clearer 73%65%56%48%42%31%34%47%47%57%66%75%

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

The wetter season lasts 6.6 months, from March 22 to October 11, with a greater than 30% chance of a given day being a wet day. The month with the most wet days at Yokota Air Base is June, with an average of 13.4 days with at least 0.04 inches of precipitation.

The drier season lasts 5.4 months, from October 11 to March 22. The month with the fewest wet days at Yokota Air Base is December, with an average of 4.3 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 Yokota Air Base is June, with an average of 13.4 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 50% on June 23.

Daily Chance of Precipitation at Yokota Air Base

Daily Chance of Precipitation at Yokota Air BasewetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jun 2350%Jun 2350%Dec 2911%Dec 2911%Mar 2230%Mar 2230%Oct 1130%Oct 1130%NowNowrainmixed
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 3.2d4.7d8.5d9.2d10.2d13.4d13.4d12.0d12.0d8.9d6.3d3.9d
Mixed 1.1d0.9d0.5d0.1d0.0d0.0d0.0d0.0d0.0d0.0d0.1d0.3d
Any 4.4d5.7d8.9d9.3d10.2d13.4d13.4d12.0d12.0d8.9d6.4d4.3d

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. Yokota Air Base experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year at Yokota Air Base. The month with the most rain at Yokota Air Base is September, with an average rainfall of 7.3 inches.

The month with the least rain at Yokota Air Base is January, with an average rainfall of 1.5 inches.

Average Monthly Rainfall at Yokota Air Base

Average Monthly Rainfall at Yokota Air BaseJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 in14 in14 inSep 197.3 inSep 197.3 inDec 311.4 inDec 311.4 inJun 286.3 inJun 286.3 inApr 74.1 inApr 74.1 inNowNow
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 1.5″2.1″3.5″4.1″4.3″5.9″5.5″5.5″7.3″5.4″2.8″1.6″

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Yokota Air Base experiences some seasonal variation in monthly snowfall.

The snowy period of the year lasts for 2.2 months, from December 28 to March 2, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow at Yokota Air Base is January, with an average snowfall of 1.8 inches.

The snowless period of the year lasts for 9.8 months, from March 2 to December 28. The least snow falls around July 30, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall at Yokota Air Base

Average Monthly Snowfall at Yokota Air BasesnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 inJan 261.9 inJan 261.9 inJul 300.0 inJul 300.0 inDec 281.0 inDec 281.0 inMar 21.0 inMar 21.0 inNowNow
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 1.8″1.6″0.5″0.1″0.0″0.0″0.0″0.0″0.0″0.0″0.1″0.5″

The length of the day at Yokota Air Base varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 44 minutes of daylight; the longest day is June 21, with 14 hours, 35 minutes of daylight.

Hours of Daylight and Twilight at Yokota Air Base

Hours of Daylight and Twilight at Yokota Air BaseJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 2012 hr, 8 minMar 2014 hr, 35 minJun 2114 hr, 35 minJun 2112 hr, 9 minSep 2212 hr, 9 minSep 229 hr, 44 minDec 219 hr, 44 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 10.0h10.9h12.0h13.1h14.1h14.5h14.3h13.5h12.4h11.3h10.3h9.8h

The earliest sunrise is at 4:26 AM on June 12, and the latest sunrise is 2 hours, 27 minutes later at 6:53 AM on January 8. The earliest sunset is at 4:28 PM on December 5, and the latest sunset is 2 hours, 34 minutes later at 7:02 PM on June 28.

Daylight saving time (DST) is not observed at Yokota Air Base during 2024.

Sunrise & Sunset with Twilight at Yokota Air Base

Sunrise & Sunset with Twilight at Yokota Air BaseJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PMJun 124:26 AMJun 124:26 AM7:02 PMJun 287:02 PMJun 28Dec 54:28 PMDec 54:28 PM6:53 AMJan 86:53 AMJan 8daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
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 Yokota Air Base

Solar Elevation and Azimuth at Yokota Air BaseJanFebMarAprMayJunJulAugSepOctNovDec12 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 AM000010101010202020203030303040404050505060607000001010101020202020303030304040405050607078NowNow
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 Yokota Air Base

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.

Yokota Air Base experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.5 months, from June 10 to September 26, during which time the comfort level is muggy, oppressive, or miserable at least 22% of the time. The month with the most muggy days at Yokota Air Base is August, with 26.6 days that are muggy or worse.

The least muggy day of the year is February 11, when muggy conditions are essentially unheard of.

Humidity Comfort Levels at Yokota Air Base

Humidity Comfort Levels at Yokota Air BasemuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 110%Feb 110%89%Aug 789%Aug 7Jun 1022%Jun 1022%Sep 2622%Sep 2622%NowNowmiserablemiserableoppressiveoppressivemuggymuggydrydryhumidhumidcomfortablecomfortable
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 0.0d0.0d0.0d0.1d0.9d9.5d24.0d26.6d13.8d1.5d0.0d0.0d

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 Yokota Air Base experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 4.8 months, from December 23 to May 17, with average wind speeds of more than 7.4 miles per hour. The windiest month of the year at Yokota Air Base is March, with an average hourly wind speed of 8.3 miles per hour.

The calmer time of year lasts for 7.2 months, from May 17 to December 23. The calmest month of the year at Yokota Air Base is July, with an average hourly wind speed of 6.5 miles per hour.

Average Wind Speed at Yokota Air Base

Average Wind Speed at Yokota Air BasewindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mphMar 248.4 mphMar 248.4 mphJul 316.4 mphJul 316.4 mphDec 237.4 mphDec 237.4 mphMay 177.4 mphMay 177.4 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) 7.78.18.38.27.46.66.56.56.86.86.87.3

The predominant average hourly wind direction at Yokota Air Base varies throughout the year.

The wind is most often from the south for 4.9 months, from April 15 to September 12, with a peak percentage of 46% on July 23. The wind is most often from the north for 3.3 months, from September 12 to December 21 and for 3.5 months, from December 30 to April 15, with a peak percentage of 47% on November 22. The wind is most often from the west for 1.3 weeks, from December 21 to December 30, with a peak percentage of 44% on December 29.

Wind Direction at Yokota Air Base

Wind Direction at Yokota Air BaseNSNJanFebMarAprMayJunJulAugSepOctNovDec0%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).

Yokota Air Base 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 2.5 months, from July 14 to September 28, with an average temperature above 74°F. The month of the year at Yokota Air Base with the warmest water is August, with an average temperature of 78°F.

The time of year with cooler water lasts for 4.0 months, from December 25 to April 24, with an average temperature below 61°F. The month of the year at Yokota Air Base with the coolest water is February, with an average temperature of 57°F.

Average Water Temperature at Yokota Air Base

Average Water Temperature at Yokota Air BasewarmcoolJanFebMarAprMayJunJulAugSepOctNovDec50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°FAug 1879°FAug 1879°F57°FFeb 2457°FFeb 24Jul 1474°FJul 1474°FSep 2874°FSep 2874°FDec 2561°FDec 2561°FApr 2461°FApr 2461°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 59°F57°F58°F60°F65°F70°F75°F78°F76°F71°F67°F62°F

To characterize how pleasant the weather is at Yokota Air Base 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 Yokota Air Base for general outdoor tourist activities is from late July to early October, with a peak score in the first week of September.

Tourism Score at Yokota Air Base

Tourism Score at Yokota Air Basebest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.26.20.00.05.55.55.25.2NowNowtemperaturetemperature precipitationprecipitationtourism 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 Yokota Air Base for hot-weather activities is from late July to late August, with a peak score in the second week of August.

Beach/Pool Score at Yokota Air Base

Beach/Pool Score at Yokota Air BaseJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.16.10.00.0NowNowtemperaturetemperature precipitationprecipitationbeach/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 Yokota Air Base typically lasts for 8.6 months (262 days), from around March 20 to around December 7, rarely starting before March 1 or after April 6, and rarely ending before November 19 or after December 25.

Time Spent in Various Temperature Bands and the Growing Season at Yokota Air Base

Time Spent in Various Temperature Bands and the Growing Season at Yokota Air Basegrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Mar 2050%Mar 2050%Dec 750%Dec 790%Apr 690%Apr 690%Nov 1990%Nov 1910%Mar 110%Mar 110%Dec 2510%Dec 250%Jan 270%Jan 27Jul 30100%Jul 30100%very 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 Yokota Air Base should appear around March 31, only rarely appearing before March 18 or after April 12.

Growing Degree Days at Yokota Air Base

Growing Degree Days at Yokota Air BaseJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°F3,000°F3,000°F3,500°F3,500°F4,000°F4,000°F4,500°F4,500°FMar 3184°FMar 3184°FJun 9900°FJun 9900°FJul 191,800°FJul 191,800°FDec 314,169°FDec 314,169°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 4.5 months, from April 11 to August 27, with an average daily incident shortwave energy per square meter above 5.3 kWh. The brightest month of the year at Yokota Air Base is May, with an average of 5.9 kWh.

The darker period of the year lasts for 3.1 months, from October 31 to February 4, with an average daily incident shortwave energy per square meter below 3.3 kWh. The darkest month of the year at Yokota Air Base is December, with an average of 2.6 kWh.

Average Daily Incident Shortwave Solar Energy at Yokota Air Base

Average Daily Incident Shortwave Solar Energy at Yokota Air BasebrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhMay 225.9 kWhMay 225.9 kWhDec 192.6 kWhDec 192.6 kWhApr 115.3 kWhApr 115.3 kWhAug 275.3 kWhAug 275.3 kWhOct 313.3 kWhOct 313.3 kWhFeb 43.3 kWhFeb 43.3 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) 2.93.64.55.45.95.55.65.54.53.62.92.6

For the purposes of this report, the geographical coordinates of Yokota Air Base are 35.748 deg latitude, 139.348 deg longitude, and 427 ft elevation.

The topography within 2 miles of Yokota Air Base contains only modest variations in elevation, with a maximum elevation change of 249 feet and an average elevation above sea level of 433 feet. Within 10 miles contains only modest variations in elevation (2,477 feet). Within 50 miles contains large variations in elevation (12,451 feet).

The area within 2 miles of Yokota Air Base is covered by artificial surfaces (46%), cropland (28%), and trees (17%), within 10 miles by artificial surfaces (40%) and trees (38%), and within 50 miles by trees (42%) and cropland (23%).

This report illustrates the typical weather at Yokota Air Base, 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

Yokota Air Base 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 include but are not limited to Iruma Ab, Atsugi United States Naval Air Station, Tokyo, Tokyo International Airport, Yokosuka Fwf, Shimofusa Ab, Tateyama Ab, and Narita International 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 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.