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Climate and Average Weather Year Round in Aspen Colorado, United States

In Aspen, the summers are comfortable and dry, the winters are freezing and snowy, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 7°F to 73°F and is rarely below -7°F or above 80°F.

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

Climate in Aspen

freezingvery coldcoldcoolcomfortablecoolcoldfreezingJanFebMarAprMayJunJulAugSepOctNovDecNowNow75%75%49%49%clearovercastprecipitation: 1.3 inprecipitation: 1.3 in0.7 in0.7 inmuggy: 0%muggy: 0%drydrytourism score: 4.3tourism score: 4.30.00.0
Aspen weather by month. Click on each chart for more information.

The warm season lasts for 3.4 months, from June 1 to September 14, with an average daily high temperature above 64°F. The hottest month of the year in Aspen is July, with an average high of 73°F and low of 44°F.

The cold season lasts for 3.5 months, from November 20 to March 5, with an average daily high temperature below 36°F. The coldest month of the year in Aspen is January, with an average low of 7°F and high of 28°F.

Average High and Low Temperature in Aspen

Average High and Low Temperature in AspenwarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec-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 2829°FJan 2829°FJul 773°FJul 773°F7°F7°F43°F43°FJun 164°FJun 164°FSep 1464°FSep 1464°FNov 2036°FNov 2036°FMar 536°FMar 536°F35°F35°F37°F37°F15°F15°F15°F15°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 28°F32°F39°F48°F58°F69°F73°F71°F64°F52°F38°F29°F
Temp. 17°F19°F27°F35°F44°F54°F59°F57°F49°F38°F26°F17°F
Low 7°F10°F17°F24°F32°F39°F44°F43°F36°F27°F17°F9°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 Aspen

Average Hourly Temperature in AspenJanFebMarAprMayJunJulAugSepOctNovDec12 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 AMNowNowfrigidfrigidfrigidfreezingfreezingvery coldcoldcoldcoolcomfortablefrigid
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.

Karayazı, Turkey (6,651 miles away) and Kuli, Russia (6,602 miles) are the far-away foreign places with temperatures most similar to Aspen (view comparison).

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In Aspen, 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 Aspen begins around May 28 and lasts for 5.2 months, ending around November 5.

The clearest month of the year in Aspen is September, during which on average the sky is clear, mostly clear, or partly cloudy 73% of the time.

The cloudier part of the year begins around November 5 and lasts for 6.7 months, ending around May 28.

The cloudiest month of the year in Aspen is February, during which on average the sky is overcast or mostly cloudy 50% of the time.

Cloud Cover Categories in Aspen

Cloud Cover Categories in AspenclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 1875%Sep 1875%Feb 1249%Feb 1249%May 2862%May 2862%Nov 562%Nov 562%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 44%50%49%48%42%29%33%35%27%31%40%44%
Clearer 56%50%51%52%58%71%67%65%73%69%60%56%

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

The wetter season lasts 10 months, from July 8 to May 14, with a greater than 21% chance of a given day being a wet day. The month with the most wet days in Aspen is July, with an average of 7.6 days with at least 0.04 inches of precipitation.

The drier season lasts 1.8 months, from May 14 to July 8. The month with the fewest wet days in Aspen is June, 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. Based on this categorization, the most common form of precipitation in Aspen changes throughout the year.

Rain alone is the most common for 5.9 months, from April 29 to October 27. The month with the most days of rain alone in Aspen is July, with an average of 7.6 days.

Snow alone is the most common for 4.8 months, from November 8 to April 2. The month with the most days of snow alone in Aspen is December, with an average of 4.4 days.

Mixed snow and rain is the most common for 1.3 months, from April 2 to April 29 and from October 27 to November 8. The month with the most days of mixed snow and rain in Aspen is April, with an average of 3.0 days.

Daily Chance of Precipitation in Aspen

Daily Chance of Precipitation in AspensnowrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jul 3029%Jul 3029%Jun 1613%Jun 1613%Apr 220%Apr 220%Oct 2720%Oct 2720%May 1421%May 1421%NowNowsnowrainmixed
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 0.1d0.3d0.6d2.0d4.2d4.1d7.6d7.6d6.3d3.5d0.8d0.1d
Mixed 0.7d1.5d2.3d3.0d1.8d0.2d0.0d0.0d0.4d1.8d2.0d0.8d
Snow 3.9d3.5d3.2d1.7d0.3d0.0d0.0d0.0d0.2d0.9d3.0d4.4d
Any 4.7d5.3d6.1d6.7d6.3d4.3d7.6d7.6d6.8d6.2d5.9d5.4d

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. Aspen experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 6.8 months, from April 11 to November 4, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Aspen is September, with an average rainfall of 1.2 inches.

The rainless period of the year lasts for 5.2 months, from November 4 to April 11. The month with the least rain in Aspen is January, with an average rainfall of 0.1 inches.

Average Monthly Rainfall in Aspen

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 0.1″0.2″0.3″0.6″0.9″0.7″1.0″1.0″1.2″0.9″0.3″0.1″

Snowfall

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

The snowy period of the year lasts for 8.0 months, from September 25 to May 26, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Aspen is December, with an average snowfall of 9.4 inches.

The snowless period of the year lasts for 4.0 months, from May 26 to September 25. The least snow falls around July 31, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall in Aspen

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 8.2″8.6″7.3″6.3″2.2″0.2″0.0″0.0″0.4″3.6″8.0″9.4″

The length of the day in Aspen varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 25 minutes of daylight; the longest day is June 20, with 14 hours, 56 minutes of daylight.

Hours of Daylight and Twilight in Aspen

Hours of Daylight and Twilight in AspenJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 1912 hr, 8 minMar 1914 hr, 56 minJun 2014 hr, 56 minJun 2012 hr, 10 minSep 2212 hr, 10 minSep 229 hr, 25 minDec 219 hr, 25 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 9.8h10.8h12.0h13.3h14.4h14.9h14.6h13.6h12.4h11.1h10.0h9.5h

The earliest sunrise is at 5:40 AM on June 13, and the latest sunrise is 1 hour, 56 minutes later at 7:36 AM on November 2. The earliest sunset is at 4:44 PM on December 6, and the latest sunset is 3 hours, 54 minutes later at 8:37 PM on June 26.

Daylight saving time (DST) is observed in Aspen 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 Aspen

Sunrise & Sunset with Twilight and Daylight Saving Time in AspenJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 135:40 AMJun 135:40 AM8:37 PMJun 268:37 PMJun 26Dec 64:44 PMDec 64:44 PM7:36 AMNov 27:36 AMNov 2Mar 10DSTMar 10DSTDSTNov 3DSTNov 3daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
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 Aspen

Solar Elevation and Azimuth in AspenJanFebMarAprMayJunJulAugSepOctNovDec12 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 AM0001010101020202030303040404050506060700001010102020202030304040505060702774NowNow
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 Aspen

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.

The perceived humidity level in Aspen, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.

Humidity Comfort Levels in Aspen

Humidity Comfort Levels in AspenJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jul 20%Jul 20%NowNowdrydry
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 0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d

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

The windier part of the year lasts for 8.0 months, from October 21 to June 21, with average wind speeds of more than 5.1 miles per hour. The windiest month of the year in Aspen is April, with an average hourly wind speed of 6.2 miles per hour.

The calmer time of year lasts for 4.0 months, from June 21 to October 21. The calmest month of the year in Aspen is August, with an average hourly wind speed of 4.1 miles per hour.

Average Wind Speed in Aspen

Average Wind Speed in AspenwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mph8 mph8 mph9 mph9 mph10 mph10 mphApr 106.2 mphApr 106.2 mphJul 314.0 mphJul 314.0 mphOct 215.1 mphOct 215.1 mphJun 215.1 mphJun 215.1 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) 5.35.65.96.25.75.24.24.14.75.15.35.3

The predominant average hourly wind direction in Aspen is from the west throughout the year.

Wind Direction in Aspen

Wind Direction in AspenJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsouthnortheast
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 Aspen 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 Aspen for general outdoor tourist activities is from late June to mid August, with a peak score in the first week of July.

Tourism Score in Aspen

Tourism Score in Aspenbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810104.34.30.00.0NowNowtemperaturetemperature 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 Aspen for hot-weather activities is from late June to late July, with a peak score in the first week of July.

Beach/Pool Score in Aspen

Beach/Pool Score in AspenJanFebMarAprMayJunJulAugSepOctNovDec002244668810101.91.90.00.0NowNowtemperaturetemperature 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 Aspen typically lasts for 2.8 months (86 days), from around June 16 to around September 10, rarely starting before May 27 or after July 8, and rarely ending before August 23 or after September 27.

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

Time Spent in Various Temperature Bands and the Growing Season in AspenJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jun 1650%Jun 1650%Sep 1050%Sep 1050%Jul 890%Jul 890%Aug 2390%Aug 2390%May 2710%May 2710%Sep 2710%Sep 2710%0%Mar 60%Mar 6Jul 2999%Jul 2999%NowNowfrigidfreezingcoldcoolcomfortablevery 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 Aspen should appear around May 27, only rarely appearing before May 17 or after June 8.

Growing Degree Days in Aspen

Growing Degree Days in AspenJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F200°F200°F400°F400°F600°F600°F800°F800°F1,000°F1,000°F1,200°F1,200°FMay 2790°FMay 2790°FSep 3900°FSep 3900°FDec 311,054°FDec 311,054°FNowNow
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 2.5 months, from May 11 to July 26, with an average daily incident shortwave energy per square meter above 7.2 kWh. The brightest month of the year in Aspen is June, with an average of 8.2 kWh.

The darker period of the year lasts for 3.3 months, from November 1 to February 10, with an average daily incident shortwave energy per square meter below 3.7 kWh. The darkest month of the year in Aspen is December, with an average of 2.6 kWh.

Average Daily Incident Shortwave Solar Energy in Aspen

Average Daily Incident Shortwave Solar Energy in AspenbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWh10 kWh10 kWhJun 168.3 kWhJun 168.3 kWhDec 212.5 kWhDec 212.5 kWhJul 267.2 kWhJul 267.2 kWhNov 13.7 kWhNov 13.7 kWhFeb 103.7 kWhFeb 103.7 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) 2.93.95.36.57.48.27.56.65.84.53.22.6

For the purposes of this report, the geographical coordinates of Aspen are 39.191 deg latitude, -106.818 deg longitude, and 8,904 ft elevation.

The topography within 2 miles of Aspen contains large variations in elevation, with a maximum elevation change of 2,808 feet and an average elevation above sea level of 8,629 feet. Within 10 miles contains large variations in elevation (6,437 feet). Within 50 miles also contains extreme variations in elevation (8,950 feet).

The area within 2 miles of Aspen is covered by trees (68%) and shrubs (30%), within 10 miles by trees (73%) and shrubs (13%), and within 50 miles by trees (58%) and shrubs (22%).

This report illustrates the typical weather in Aspen, 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Aspen.

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