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Climate and Average Weather Year Round in Yorii Japan

In Yorii, the summers are short, warm, muggy, wet, and mostly cloudy and the winters are very cold, snowy, and mostly clear. Over the course of the year, the temperature typically varies from 29°F to 88°F and is rarely below 22°F or above 95°F.

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

Climate in Yorii

coldcoolcomfortablewarmhotwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow76%76%28%28%clearovercastprecipitation: 6.9 inprecipitation: 6.9 in1.2 in1.2 inmuggy: 90%muggy: 90%0%0%drydrytourism score: 6.1tourism score: 6.10.00.0
Yorii weather by month. Click on each chart for more information.

The hot season lasts for 2.7 months, from June 24 to September 15, with an average daily high temperature above 79°F. The hottest month of the year in Yorii is August, with an average high of 86°F and low of 72°F.

The cold season lasts for 3.4 months, from December 2 to March 16, with an average daily high temperature below 53°F. The coldest month of the year in Yorii is January, with an average low of 29°F and high of 45°F.

Average High and Low Temperature in Yorii

Average High and Low Temperature in YoriihotcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 2645°FJan 2645°FAug 688°FAug 688°F29°F29°F73°F73°FJun 2479°FJun 2479°FSep 1579°FSep 1579°FDec 253°FDec 253°FMar 1653°FMar 1653°F66°F66°F66°F66°F37°F37°F37°F37°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 45°F46°F54°F65°F73°F78°F84°F86°F79°F69°F59°F50°F
Temp. 36°F38°F44°F55°F64°F70°F77°F79°F72°F61°F50°F41°F
Low 29°F31°F37°F47°F56°F64°F71°F72°F65°F54°F43°F34°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 in Yorii

Average Hourly Temperature in YoriiJanFebMarAprMayJunJulAugSepOctNovDec12 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 AMNowNowfreezingvery coldvery coldvery coldcoldcoldcoolcoolcomfortablewarmhotwarmcold
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.

Wattsville, Virginia, United States (6,868 miles away) is the far-away foreign place with temperatures most similar to Yorii (view comparison).

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Compare Yorii to another city:

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In Yorii, 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 Yorii begins around October 6 and lasts for 5.8 months, ending around April 1.

The clearest month of the year in Yorii is December, during which on average the sky is clear, mostly clear, or partly cloudy 74% of the time.

The cloudier part of the year begins around April 1 and lasts for 6.2 months, ending around October 6.

The cloudiest month of the year in Yorii is June, during which on average the sky is overcast or mostly cloudy 68% of the time.

Cloud Cover Categories in Yorii

Cloud Cover Categories in YoriiclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%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%Jul 128%Jul 128%Oct 651%Oct 651%Apr 152%Apr 152%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 28%35%44%51%57%68%67%55%54%43%34%26%
Clearer 72%65%56%49%43%32%34%45%46%57%66%74%

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

The wetter season lasts 6.4 months, from March 30 to October 9, with a greater than 30% chance of a given day being a wet day. The month with the most wet days in Yorii is July, with an average of 14.6 days with at least 0.04 inches of precipitation.

The drier season lasts 5.6 months, from October 9 to March 30. The month with the fewest wet days in Yorii is December, with an average of 3.6 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 in Yorii is July, with an average of 14.6 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 52% on July 2.

Daily Chance of Precipitation in Yorii

Daily Chance of Precipitation in YoriiwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jul 252%Jul 252%Dec 299%Dec 299%Mar 3031%Mar 3031%Oct 930%Oct 930%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 2.5d3.9d7.6d8.8d9.9d13.3d14.6d13.1d12.4d8.5d5.7d3.3d
Mixed 1.0d1.1d0.7d0.1d0.0d0.0d0.0d0.0d0.0d0.0d0.1d0.3d
Snow 0.2d0.2d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d
Any 3.8d5.2d8.3d9.0d9.9d13.3d14.6d13.1d12.4d8.5d5.8d3.6d

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. Yorii experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in Yorii. The month with the most rain in Yorii is September, with an average rainfall of 6.9 inches.

The month with the least rain in Yorii is January, with an average rainfall of 1.0 inches.

Average Monthly Rainfall in Yorii

Average Monthly Rainfall in YoriiJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 in14 in14 inSep 146.9 inSep 146.9 inJan 41.0 inJan 41.0 inJul 16.0 inJul 16.0 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 1.0″1.5″2.7″3.5″3.8″5.4″5.5″5.5″6.9″4.7″2.4″1.3″

Snowfall

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

The snowy period of the year lasts for 3.0 months, from December 22 to March 23, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Yorii is February, with an average snowfall of 3.1 inches.

The snowless period of the year lasts for 9.0 months, from March 23 to December 22. The least snow falls around August 3, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall in Yorii

Average Monthly Snowfall in YoriisnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 inJan 273.4 inJan 273.4 inAug 30.0 inAug 30.0 inDec 221.0 inDec 221.0 inMar 231.0 inMar 231.0 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 3.0″3.1″1.3″0.2″0.0″0.0″0.0″0.0″0.0″0.0″0.1″0.6″

The length of the day in Yorii varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 42 minutes of daylight; the longest day is June 21, with 14 hours, 37 minutes of daylight.

Hours of Daylight and Twilight in Yorii

Hours of Daylight and Twilight in YoriiJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 2012 hr, 8 minMar 2014 hr, 37 minJun 2114 hr, 37 minJun 2112 hr, 9 minSep 2212 hr, 9 minSep 229 hr, 42 minDec 219 hr, 42 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 10.0h10.9h12.0h13.1h14.1h14.6h14.3h13.5h12.4h11.3h10.3h9.8h

The earliest sunrise is at 4:25 AM on June 13, and the latest sunrise is 2 hours, 29 minutes later at 6:54 AM on January 7. The earliest sunset is at 4:28 PM on December 5, and the latest sunset is 2 hours, 36 minutes later at 7:04 PM on June 28.

Daylight saving time (DST) is not observed in Yorii during 2024.

Sunrise & Sunset with Twilight in Yorii

Sunrise & Sunset with Twilight in YoriiJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PMJun 134:25 AMJun 134:25 AM7:04 PMJun 287:04 PMJun 28Dec 54:28 PMDec 54:28 PM6:54 AMJan 76:54 AMJan 7daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
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 in Yorii

Solar Elevation and Azimuth in YoriiJanFebMarAprMayJunJulAugSepOctNovDec12 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 AM000010101010202020203030303040404050505060607000001010101020202020303030304040405050607077NowNow
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 in Yorii

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.

Yorii experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.2 months, from June 16 to September 23, during which time the comfort level is muggy, oppressive, or miserable at least 23% of the time. The month with the most muggy days in Yorii is August, with 26.1 days that are muggy or worse.

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

Humidity Comfort Levels in Yorii

Humidity Comfort Levels in YoriimuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 130%Feb 130%90%Aug 690%Aug 6Jun 1623%Jun 1623%Sep 2323%Sep 2323%NowNowoppressiveoppressivemuggymuggydrydrymiserablemiserablecomfortablecomfortable
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 0.0d0.0d0.0d0.0d0.4d7.3d23.1d26.1d11.6d0.8d0.0d0.0d

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 in Yorii experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.2 months, from December 1 to May 8, with average wind speeds of more than 6.8 miles per hour. The windiest month of the year in Yorii is February, with an average hourly wind speed of 8.4 miles per hour.

The calmer time of year lasts for 6.8 months, from May 8 to December 1. The calmest month of the year in Yorii is July, with an average hourly wind speed of 5.3 miles per hour.

Average Wind Speed in Yorii

Average Wind Speed in YoriiwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mphFeb 78.5 mphFeb 78.5 mphJul 305.2 mphJul 305.2 mphDec 16.8 mphDec 16.8 mphMay 86.8 mphMay 86.8 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) 8.18.48.17.56.55.65.35.45.85.96.47.5

The predominant average hourly wind direction in Yorii varies throughout the year.

The wind is most often from the north for 1.3 months, from February 29 to April 7 and for 1.1 months, from September 29 to November 3, with a peak percentage of 39% on February 29. The wind is most often from the west for 1.1 weeks, from April 7 to April 15 and for 3.9 months, from November 3 to February 28, with a peak percentage of 30% on April 8. The wind is most often from the east for 1.1 months, from June 6 to July 9 and for 2.2 months, from July 23 to September 29, with a peak percentage of 39% on August 20.

Wind Direction in Yorii

Wind Direction in YoriiWNSESENWJanFebMarAprMayJunJulAugSepOctNovDec0%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).

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

Tourism Score in Yorii

Tourism Score in Yoriibest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.16.10.00.05.45.45.25.2NowNowtemperaturetemperature 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 Yorii for hot-weather activities is from late July to late August, with a peak score in the second week of August.

Beach/Pool Score in Yorii

Beach/Pool Score in YoriiJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.06.00.00.0NowNowtemperaturetemperature 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 in Yorii typically lasts for 8.3 months (253 days), from around March 23 to around December 1, rarely starting before March 6 or after April 10, and rarely ending before November 14 or after December 18.

Time Spent in Various Temperature Bands and the Growing Season in Yorii

Time Spent in Various Temperature Bands and the Growing Season in Yoriigrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Mar 2350%Mar 2350%Dec 150%Dec 190%Apr 1090%Apr 1090%Nov 1490%Nov 1410%Mar 610%Mar 610%Dec 1810%Dec 180%Jan 280%Jan 28Jul 27100%Jul 27100%very coldcoldcoolcomfortablewarmhotfreezing
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 in Yorii should appear around April 7, only rarely appearing before March 28 or after April 16.

Growing Degree Days in Yorii

Growing Degree Days in YoriiJanFebMarAprMayJunJulAugSepOctNovDec0°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°FApr 786°FApr 786°FJun 12900°FJun 12900°FJul 201,800°FJul 201,800°FDec 314,064°FDec 314,064°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 4.4 months, from April 10 to August 23, with an average daily incident shortwave energy per square meter above 5.3 kWh. The brightest month of the year in Yorii is May, with an average of 5.9 kWh.

The darker period of the year lasts for 3.1 months, from November 2 to February 4, with an average daily incident shortwave energy per square meter below 3.2 kWh. The darkest month of the year in Yorii is December, with an average of 2.6 kWh.

Average Daily Incident Shortwave Solar Energy in Yorii

Average Daily Incident Shortwave Solar Energy in YoriibrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhMay 216.0 kWhMay 216.0 kWhDec 222.5 kWhDec 222.5 kWhApr 105.3 kWhApr 105.3 kWhAug 235.3 kWhAug 235.3 kWhNov 23.2 kWhNov 23.2 kWhFeb 43.2 kWhFeb 43.2 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) 2.83.64.55.55.95.65.65.54.53.62.92.6

For the purposes of this report, the geographical coordinates of Yorii are 36.116 deg latitude, 139.194 deg longitude, and 335 ft elevation.

The topography within 2 miles of Yorii contains very significant variations in elevation, with a maximum elevation change of 879 feet and an average elevation above sea level of 447 feet. Within 10 miles contains very significant variations in elevation (3,133 feet). Within 50 miles contains large variations in elevation (9,521 feet).

The area within 2 miles of Yorii is covered by trees (56%) and cropland (40%), within 10 miles by trees (60%) and cropland (35%), and within 50 miles by trees (58%) and cropland (26%).

This report illustrates the typical weather in Yorii, 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 Yorii.

For each station, the records are corrected for the elevation difference between that station and Yorii 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 Yorii is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Yorii and a given station.

The stations contributing to this reconstruction are:

  • Iruma Ab (RJTJ, 92%, 22 mi, southeast, -43 ft elevation change)
  • Toyama Airport (RJNT, 8%, 118 mi, west, -240 ft elevation change)

To get a sense of how much these sources agree with each other, you can view a comparison of Yorii and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

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.