1. WeatherSpark.com
  2. United States
  3. South Dakota

Climate and Average Weather Year Round in Selby South Dakota, United States

In Selby, the summers are warm; the winters are freezing, snowy, and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 7°F to 85°F and is rarely below -14°F or above 95°F.

Based on the tourism score, the best time of year to visit Selby for warm-weather activities is from late June to late August.

Climate in Selby

freezingcoldcoolwarmwarmcoolcoldfreezingJanFebMarAprMayJunJulAugSepOctNovDecNowNow76%76%44%44%clearovercastprecipitation: 2.9 inprecipitation: 2.9 in0.2 in0.2 inmuggy: 20%muggy: 20%0%0%drydrytourism score: 7.0tourism score: 7.00.00.0
Selby weather by month. Click on each chart for more information.

The hot season lasts for 3.6 months, from May 30 to September 16, with an average daily high temperature above 73°F. The hottest month of the year in Selby is July, with an average high of 84°F and low of 61°F.

The cold season lasts for 3.4 months, from November 23 to March 3, with an average daily high temperature below 36°F. The coldest month of the year in Selby is January, with an average low of 7°F and high of 25°F.

Average High and Low Temperature in Selby

Average High and Low Temperature in SelbyhotcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec-20°F-20°F-10°F-10°F0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 324°FJan 324°FJul 2385°FJul 2385°F7°F7°F62°F62°FMay 3073°FMay 3073°FSep 1673°FSep 1673°FNov 2336°FNov 2336°FMar 336°FMar 336°F51°F51°F50°F50°F20°F20°F17°F17°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 25°F30°F42°F57°F69°F78°F84°F83°F73°F58°F41°F27°F
Temp. 15°F19°F30°F44°F56°F66°F72°F70°F60°F46°F31°F18°F
Low 7°F12°F23°F34°F46°F56°F61°F59°F50°F37°F23°F11°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 Selby

Average Hourly Temperature in SelbyJanFebMarAprMayJunJulAugSepOctNovDec12 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 AMNowNowfrigidfrigidfreezingfreezingcoldcoldcoolcomfortablecomfortablewarmvery coldfrigidvery coldfrigid
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.

Talghar, Kazakhstan (6,305 miles away); Jiayuguan, China (6,441 miles); and Hohhot, China (6,166 miles) are the far-away foreign places with temperatures most similar to Selby (view comparison).

Map
Marker
© OpenStreetMap contributors

Compare Selby to another city:

Map

In Selby, 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 Selby begins around June 7 and lasts for 3.9 months, ending around October 4.

The clearest month of the year in Selby is July, 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 October 4 and lasts for 8.1 months, ending around June 7.

The cloudiest month of the year in Selby is January, during which on average the sky is overcast or mostly cloudy 56% of the time.

Cloud Cover Categories in Selby

Cloud Cover Categories in SelbyclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jul 2376%Jul 2376%Jan 1744%Jan 1744%Jun 759%Jun 759%Oct 460%Oct 460%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 56%55%55%51%47%36%26%27%35%44%50%54%
Clearer 44%45%45%49%53%64%74%73%65%56%50%46%

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

The wetter season lasts 4.2 months, from April 22 to August 30, with a greater than 21% chance of a given day being a wet day. The month with the most wet days in Selby is June, with an average of 10.8 days with at least 0.04 inches of precipitation.

The drier season lasts 7.8 months, from August 30 to April 22. The month with the fewest wet days in Selby is January, with an average of 1.3 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. Based on this categorization, the most common form of precipitation in Selby changes throughout the year.

Rain alone is the most common for 8.0 months, from March 13 to November 12. The month with the most days of rain alone in Selby is June, with an average of 10.8 days.

Snow alone is the most common for 4.0 months, from November 12 to March 13. The month with the most days of snow alone in Selby is February, with an average of 1.3 days.

Daily Chance of Precipitation in Selby

Daily Chance of Precipitation in SelbysnowrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jun 539%Jun 539%Jan 253%Jan 253%Mar 139%Mar 139%Nov 127%Nov 127%Apr 2221%Apr 2221%Aug 3021%Aug 3021%NowNowrainsnow
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 0.1d0.2d1.3d4.4d8.8d10.8d9.4d7.7d5.4d3.5d0.8d0.1d
Mixed 0.1d0.2d0.6d0.6d0.1d0.0d0.0d0.0d0.0d0.2d0.3d0.1d
Snow 1.1d1.3d1.1d0.4d0.0d0.0d0.0d0.0d0.0d0.2d0.9d1.2d
Any 1.3d1.7d3.0d5.4d8.9d10.8d9.4d7.7d5.4d4.0d2.0d1.5d

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. Selby experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 7.4 months, from March 21 to November 3, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Selby is June, with an average rainfall of 2.9 inches.

The rainless period of the year lasts for 4.5 months, from November 3 to March 21. The month with the least rain in Selby is January, with an average rainfall of 0.0 inches.

Average Monthly Rainfall in Selby

Average Monthly Rainfall in SelbyrainJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 inJun 132.9 inJun 132.9 inJan 90.0 inJan 90.0 inMar 210.5 inMar 210.5 inNov 30.5 inNov 30.5 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 snowfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 0.0″0.1″0.4″1.4″2.5″2.9″2.1″1.8″1.5″1.2″0.2″0.0″

Snowfall

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

The snowy period of the year lasts for 6.0 months, from October 30 to April 30, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Selby is March, with an average snowfall of 2.6 inches.

The snowless period of the year lasts for 6.0 months, from April 30 to October 30. The least snow falls around July 17, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall in Selby

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 1.6″2.3″2.6″2.1″0.1″0.0″0.0″0.0″0.0″0.5″1.6″2.2″

The length of the day in Selby varies significantly over the course of the year. In 2024, the shortest day is December 21, with 8 hours, 42 minutes of daylight; the longest day is June 20, with 15 hours, 41 minutes of daylight.

Hours of Daylight and Twilight in Selby

Hours of Daylight and Twilight in SelbyJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 1912 hr, 8 minMar 1915 hr, 41 minJun 2015 hr, 41 minJun 2012 hr, 12 minSep 2212 hr, 12 minSep 228 hr, 42 minDec 218 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 9.2h10.4h12.0h13.6h14.9h15.6h15.2h14.0h12.5h10.9h9.5h8.8h

The earliest sunrise is at 5:50 AM on June 15, and the latest sunrise is 2 hours, 31 minutes later at 8:21 AM on November 2. The earliest sunset is at 4:56 PM on December 9, and the latest sunset is 4 hours, 37 minutes later at 9:33 PM on June 25.

Daylight saving time (DST) is observed in Selby during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

Sunrise & Sunset with Twilight and Daylight Saving Time in Selby

Sunrise & Sunset with Twilight and Daylight Saving Time in SelbyJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 155:50 AMJun 155:50 AM9:33 PMJun 259:33 PMJun 25Dec 94:56 PMDec 94:56 PM8:21 AMNov 28:21 AMNov 2Mar 10DSTMar 10DSTDSTNov 3DSTNov 3daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
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 transitions to and from daylight saving time are indicated by the 'DST' labels.

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 Selby

Solar Elevation and Azimuth in SelbyJanFebMarAprMayJunJulAugSepOctNovDec12 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 AM000101010102020203030304040506000010101020202020303040405050602168NowNow
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 Selby

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.

Selby experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.0 months, from June 9 to September 8, during which time the comfort level is muggy, oppressive, or miserable at least 5% of the time. The month with the most muggy days in Selby is July, with 5.8 days that are muggy or worse.

The least muggy day of the year is February 25, when muggy conditions are essentially unheard of.

Humidity Comfort Levels in Selby

Humidity Comfort Levels in SelbymuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 250%Feb 250%Jul 1720%Jul 1720%Jun 95%Jun 95%Sep 85%Sep 85%NowNowmuggymuggycomfortablecomfortabledrydry
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 0.0d0.0d0.0d0.0d0.2d2.4d5.8d3.8d0.8d0.0d0.0d0.0d

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 Selby experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.5 months, from December 21 to June 7, with average wind speeds of more than 11.4 miles per hour. The windiest month of the year in Selby is April, with an average hourly wind speed of 12.6 miles per hour.

The calmer time of year lasts for 6.5 months, from June 7 to December 21. The calmest month of the year in Selby is July, with an average hourly wind speed of 10.3 miles per hour.

Average Wind Speed in Selby

Average Wind Speed in SelbywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mph20 mph20 mphMar 3112.8 mphMar 3112.8 mphJul 309.9 mphJul 309.9 mphDec 2111.4 mphDec 2111.4 mphJun 711.4 mphJun 711.4 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) 11.811.812.512.612.211.210.310.311.411.811.411.4

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

The wind is most often from the north for 3.3 months, from February 1 to May 11 and for 3.4 weeks, from September 25 to October 19, with a peak percentage of 35% on April 10. The wind is most often from the south for 4.5 months, from May 11 to September 25, with a peak percentage of 37% on August 19. The wind is most often from the west for 3.4 months, from October 19 to February 1, with a peak percentage of 37% on January 1.

Wind Direction in Selby

Wind Direction in SelbyWNSNWJanFebMarAprMayJunJulAugSepOctNovDec0%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 Selby 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 Selby for general outdoor tourist activities is from late June to late August, with a peak score in the last week of July.

Tourism Score in Selby

Tourism Score in Selbybest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.07.00.00.0NowNowtemperaturetemperature 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 Selby for hot-weather activities is from early July to mid August, with a peak score in the last week of July.

Beach/Pool Score in Selby

Beach/Pool Score in Selbybest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810104.94.90.00.0NowNowtemperaturetemperature 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 Selby typically lasts for 4.9 months (150 days), from around May 5 to around October 2, rarely starting before April 16 or after May 23, and rarely ending before September 14 or after October 20.

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

Time Spent in Various Temperature Bands and the Growing Season in Selbygrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 550%May 550%Oct 250%Oct 250%May 2390%May 2390%Sep 1490%Sep 1490%Apr 1610%Apr 1610%Oct 2010%Oct 2010%0%Dec 40%Dec 4Jul 19100%Jul 19100%NowNowfrigidfreezingcoolcomfortablewarmhotcoldvery cold
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 Selby should appear around April 25, only rarely appearing before April 13 or after May 10.

Growing Degree Days in Selby

Growing Degree Days in SelbyJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°FApr 2590°FApr 2590°FJul 3900°FJul 3900°FAug 141,800°FAug 141,800°FDec 312,570°FDec 312,570°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 extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.4 months, from May 3 to August 17, with an average daily incident shortwave energy per square meter above 6.2 kWh. The brightest month of the year in Selby is July, with an average of 7.2 kWh.

The darker period of the year lasts for 3.5 months, from October 27 to February 12, with an average daily incident shortwave energy per square meter below 2.7 kWh. The darkest month of the year in Selby is December, with an average of 1.5 kWh.

Average Daily Incident Shortwave Solar Energy in Selby

Average Daily Incident Shortwave Solar Energy in SelbybrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJul 17.4 kWhJul 17.4 kWhDec 241.5 kWhDec 241.5 kWhMay 36.2 kWhMay 36.2 kWhAug 176.2 kWhAug 176.2 kWhOct 272.7 kWhOct 272.7 kWhFeb 122.7 kWhFeb 122.7 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) 1.82.84.25.56.57.27.26.34.83.32.01.5

For the purposes of this report, the geographical coordinates of Selby are 45.506 deg latitude, -100.032 deg longitude, and 1,900 ft elevation.

The topography within 2 miles of Selby contains only modest variations in elevation, with a maximum elevation change of 161 feet and an average elevation above sea level of 1,889 feet. Within 10 miles contains only modest variations in elevation (538 feet). Within 50 miles contains significant variations in elevation (902 feet).

The area within 2 miles of Selby is covered by cropland (65%) and grassland (35%), within 10 miles by grassland (53%) and cropland (47%), and within 50 miles by grassland (68%) and cropland (29%).

This report illustrates the typical weather in Selby, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Selby.

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

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Selby 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.