1. WeatherSpark.com
  2. United States
  3. California

Climate and Average Weather Year Round in Los Altos California, United States

In Los Altos, the summers are long, comfortable, arid, and mostly clear and the winters are short, cold, wet, and partly cloudy. Over the course of the year, the temperature typically varies from 44°F to 76°F and is rarely below 37°F or above 86°F.

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

Climate in Los Altos

coolcomfortablecomfortablecoolJanFebMarAprMayJunJulAugSepOctNovDecNowNow92%92%45%45%clearovercastprecipitation: 3.7 inprecipitation: 3.7 in0.0 in0.0 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 8.2tourism score: 8.21.21.2
Los Altos weather by month. Click on each chart for more information.

The warm season lasts for 4.5 months, from June 2 to October 16, with an average daily high temperature above 72°F. The hottest month of the year in Los Altos is August, with an average high of 75°F and low of 59°F.

The cool season lasts for 2.3 months, from November 28 to February 9, with an average daily high temperature below 61°F. The coldest month of the year in Los Altos is December, with an average low of 45°F and high of 58°F.

Average High and Low Temperature in Los Altos

Average High and Low Temperature in Los AltoswarmcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FDec 3157°FDec 3157°FSep 1076°FSep 1076°F44°F44°F59°F59°FJun 272°FJun 272°FOct 1672°FOct 1672°FFeb 961°FFeb 961°F55°F55°F55°F55°F46°F46°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 58°F61°F64°F67°F70°F74°F74°F75°F75°F72°F64°F58°F
Temp. 50°F53°F55°F58°F61°F64°F65°F66°F65°F62°F55°F50°F
Low 44°F47°F49°F51°F54°F57°F59°F59°F58°F55°F49°F45°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 Los Altos

Average Hourly Temperature in Los AltosJanFebMarAprMayJunJulAugSepOctNovDec12 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 AMNowNowcoldcoldcoldcoldcoolcomfortable
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.

Monte Patria, Chile (5,754 miles away) and Vieira de Leiria, Portugal (5,632 miles) are the far-away foreign places with temperatures most similar to Los Altos (view comparison).

Map
Marker
© OpenStreetMap contributors

Compare Los Altos to another city:

Map

In Los Altos, 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 Los Altos begins around May 23 and lasts for 5.0 months, ending around October 24.

The clearest month of the year in Los Altos is August, during which on average the sky is clear, mostly clear, or partly cloudy 91% of the time.

The cloudier part of the year begins around October 24 and lasts for 7.0 months, ending around May 23.

The cloudiest month of the year in Los Altos is January, during which on average the sky is overcast or mostly cloudy 53% of the time.

Cloud Cover Categories in Los Altos

Cloud Cover Categories in Los AltosclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Aug 792%Aug 792%Jan 1245%Jan 1245%May 2368%May 2368%Oct 2469%Oct 2469%NowNowclearovercastpartly cloudymostly clearmostly cloudy
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 53%53%49%42%33%19%10%9%13%27%43%51%
Clearer 47%47%51%58%67%81%90%91%87%73%57%49%

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

The wetter season lasts 5.2 months, from November 4 to April 9, with a greater than 15% chance of a given day being a wet day. The month with the most wet days in Los Altos is February, with an average of 8.2 days with at least 0.04 inches of precipitation.

The drier season lasts 6.8 months, from April 9 to November 4. The month with the fewest wet days in Los Altos is July, with an average of 0.1 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 Los Altos is February, with an average of 8.2 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 30% on February 20.

Daily Chance of Precipitation in Los Altos

Daily Chance of Precipitation in Los AltoswetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 2030%Feb 2030%Jul 180%Jul 180%Nov 415%Nov 415%Apr 915%Apr 915%NowNowrain
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 7.8d8.2d7.5d4.0d2.0d0.5d0.1d0.2d0.6d2.5d5.9d8.1d

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. Los Altos experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 7.3 months, from October 3 to May 11, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Los Altos is February, with an average rainfall of 3.7 inches.

The rainless period of the year lasts for 4.7 months, from May 11 to October 3. The month with the least rain in Los Altos is July, with an average rainfall of 0.0 inches.

Average Monthly Rainfall in Los Altos

Average Monthly Rainfall in Los AltosrainrainJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 inFeb 153.7 inFeb 153.7 inJul 290.0 inJul 290.0 inOct 30.5 inOct 30.5 inMay 110.5 inMay 110.5 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 3.3″3.7″2.6″1.1″0.4″0.1″0.0″0.0″0.2″0.9″2.2″3.3″

The length of the day in Los Altos varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 35 minutes of daylight; the longest day is June 20, with 14 hours, 45 minutes of daylight.

Hours of Daylight and Twilight in Los Altos

Hours of Daylight and Twilight in Los AltosJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 1912 hr, 8 minMar 1914 hr, 45 minJun 2014 hr, 45 minJun 2012 hr, 10 minSep 2212 hr, 10 minSep 229 hr, 35 minDec 219 hr, 35 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 9.9h10.8h12.0h13.2h14.2h14.7h14.4h13.5h12.4h11.2h10.2h9.6h

The earliest sunrise is at 5:47 AM on June 12, and the latest sunrise is 1 hour, 48 minutes later at 7:34 AM on November 2. The earliest sunset is at 4:50 PM on December 6, and the latest sunset is 3 hours, 43 minutes later at 8:33 PM on June 27.

Daylight saving time (DST) is observed in Los Altos 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 Los Altos

Sunrise & Sunset with Twilight and Daylight Saving Time in Los AltosJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 125:47 AMJun 125:47 AM8:33 PMJun 278:33 PMJun 27Dec 64:50 PMDec 64:50 PM7:34 AMNov 27:34 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 Los Altos

Solar Elevation and Azimuth in Los AltosJanFebMarAprMayJunJulAugSepOctNovDec12 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 AM0001010101020202030303040404050506060700001010102020202030304040505060702976NowNow
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 Los Altos

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 Los Altos, 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 Los Altos

Humidity Comfort Levels in Los AltosJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 150%Feb 150%Jul 240%Jul 240%NowNowcomfortablecomfortabledrydryhumidhumid
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 Los Altos experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.3 months, from February 15 to July 23, with average wind speeds of more than 8.1 miles per hour. The windiest month of the year in Los Altos is May, with an average hourly wind speed of 9.1 miles per hour.

The calmer time of year lasts for 6.7 months, from July 23 to February 15. The calmest month of the year in Los Altos is October, with an average hourly wind speed of 6.9 miles per hour.

Average Wind Speed in Los Altos

Average Wind Speed in Los AltoswindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mphJun 49.3 mphJun 49.3 mphOct 196.8 mphOct 196.8 mphFeb 158.1 mphFeb 158.1 mphJul 238.1 mphJul 238.1 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) 7.78.18.48.89.19.18.37.87.16.97.58.0

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

The wind is most often from the west for 8.9 months, from February 13 to November 11, with a peak percentage of 92% on August 10. The wind is most often from the north for 3.1 months, from November 11 to February 13, with a peak percentage of 34% on January 1.

Wind Direction in Los Altos

Wind Direction in Los AltosNWNJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestnortheastsouth
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).

Los Altos 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 some seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.6 months, from July 31 to October 17, with an average temperature above 57°F. The month of the year in Los Altos with the warmest water is September, with an average temperature of 58°F.

The time of year with cooler water lasts for 5.7 months, from December 20 to June 10, with an average temperature below 54°F. The month of the year in Los Altos with the coolest water is April, with an average temperature of 53°F.

Average Water Temperature in Los Altos

Average Water Temperature in Los AltoswarmcoolJanFebMarAprMayJunJulAugSepOctNovDec50°F50°F52°F52°F54°F54°F56°F56°F58°F58°F60°F60°F62°F62°FSep 1458°FSep 1458°F53°FMay 153°FMay 1Jul 3157°FJul 3157°FOct 1757°FOct 1757°FDec 2054°FDec 2054°FJun 1054°FJun 1054°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 54°F54°F54°F53°F53°F55°F56°F58°F58°F57°F56°F54°F

To characterize how pleasant the weather is in Los Altos 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 Los Altos for general outdoor tourist activities is from late June to late September, with a peak score in the last week of July.

Tourism Score in Los Altos

Tourism Score in Los Altosbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810108.28.21.21.2 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 Los Altos for hot-weather activities is from late June to mid September, with a peak score in the third week of August.

Beach/Pool Score in Los Altos

Beach/Pool Score in Los Altosbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810102.32.30.00.0temperaturetemperature 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).

Temperatures in Los Altos are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Time Spent in Various Temperature Bands and the Growing Season in Los Altos

Time Spent in Various Temperature Bands and the Growing Season in Los AltosJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%100%Feb 23100%Feb 2392%Jan 392%Jan 3Jul 9100%Jul 9100%NowNowvery coldcoldcoolcomfortablewarm
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.

Growing Degree Days in Los Altos

Growing Degree Days in Los AltosJanFebMarAprMayJunJulAugSepOctNovDec0°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°FFeb 190°FFeb 190°FMay 25900°FMay 25900°FJul 271,800°FJul 271,800°FDec 313,458°FDec 313,458°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 3.6 months, from May 6 to August 25, with an average daily incident shortwave energy per square meter above 7.2 kWh. The brightest month of the year in Los Altos is July, with an average of 8.2 kWh.

The darker period of the year lasts for 3.5 months, from November 3 to February 18, with an average daily incident shortwave energy per square meter below 3.5 kWh. The darkest month of the year in Los Altos is December, with an average of 2.3 kWh.

Average Daily Incident Shortwave Solar Energy in Los Altos

Average Daily Incident Shortwave Solar Energy in Los AltosbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWh10 kWh10 kWhJun 268.4 kWhJun 268.4 kWhDec 222.2 kWhDec 222.2 kWhMay 67.2 kWhMay 67.2 kWhAug 257.2 kWhAug 257.2 kWhNov 33.5 kWhNov 33.5 kWhFeb 183.5 kWhFeb 183.5 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) 2.63.44.86.37.58.28.27.56.14.43.02.3

For the purposes of this report, the geographical coordinates of Los Altos are 37.385 deg latitude, -122.114 deg longitude, and 157 ft elevation.

The topography within 2 miles of Los Altos contains only modest variations in elevation, with a maximum elevation change of 469 feet and an average elevation above sea level of 168 feet. Within 10 miles contains only modest variations in elevation (2,907 feet). Within 50 miles contains large variations in elevation (4,318 feet).

The area within 2 miles of Los Altos is covered by artificial surfaces (100%), within 10 miles by artificial surfaces (41%) and trees (20%), and within 50 miles by water (41%) and grassland (17%).

This report illustrates the typical weather in Los Altos, 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 Los Altos.

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