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Climate and Average Weather Year Round at Gnoss Field California, United States

At Gnoss Field, the summers are long, warm, 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 39°F to 83°F and is rarely below 30°F or above 93°F.

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

Climate at Gnoss Field

coolcomfortablewarmcoolJanFebMarAprMayJunJulAugSepOctNovDecNowNow92%92%44%44%clearovercastprecipitation: 4.8 inprecipitation: 4.8 in0.0 in0.0 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 6.3tourism score: 6.30.70.7
Gnoss Field weather by month. Click on each chart for more information.

The warm season lasts for 4.0 months, from June 9 to October 11, with an average daily high temperature above 78°F. The hottest month of the year at Gnoss Field is July, with an average high of 82°F and low of 52°F.

The cool season lasts for 2.4 months, from November 27 to February 10, with an average daily high temperature below 61°F. The coldest month of the year at Gnoss Field is January, with an average low of 40°F and high of 57°F.

Average High and Low Temperature at Gnoss Field

Average High and Low Temperature at Gnoss FieldwarmcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FDec 3055°FDec 3055°FAug 2383°FAug 2383°F39°F39°F52°F52°FJun 978°FJun 978°FOct 1178°FOct 1178°FFeb 1061°FFeb 1061°F50°F50°F48°F48°F41°F41°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 57°F61°F65°F69°F74°F79°F82°F83°F82°F76°F65°F57°F
Temp. 47°F50°F53°F56°F59°F63°F65°F64°F63°F59°F53°F47°F
Low 40°F42°F44°F46°F48°F51°F52°F52°F51°F47°F43°F39°F

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature at Gnoss Field

Average Hourly Temperature at Gnoss FieldJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNowNowvery coldvery coldcoldcoolcoolcomfortablewarmvery coldvery 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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Melipilla, Chile (5,963 miles away) and Kendenup, Australia (9,146 miles) are the far-away foreign places with temperatures most similar to Gnoss Field (view comparison).

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At Gnoss Field, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year at Gnoss Field begins around May 17 and lasts for 5.1 months, ending around October 22.

The clearest month of the year at Gnoss Field is July, during which on average the sky is clear, mostly clear, or partly cloudy 90% of the time.

The cloudier part of the year begins around October 22 and lasts for 6.9 months, ending around May 17.

The cloudiest month of the year at Gnoss Field is January, during which on average the sky is overcast or mostly cloudy 55% of the time.

Cloud Cover Categories at Gnoss Field

Cloud Cover Categories at Gnoss FieldclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jul 1992%Jul 1992%Jan 1144%Jan 1144%May 1768%May 1768%Oct 2268%Oct 2268%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 55%54%51%42%33%19%10%10%13%28%46%53%
Clearer 45%46%49%58%67%81%90%90%87%72%54%47%

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

The wetter season lasts 5.2 months, from November 2 to April 8, with a greater than 16% chance of a given day being a wet day. The month with the most wet days at Gnoss Field is February, with an average of 8.9 days with at least 0.04 inches of precipitation.

The drier season lasts 6.8 months, from April 8 to November 2. The month with the fewest wet days at Gnoss Field is July, with an average of 0.2 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone at Gnoss Field is February, with an average of 8.8 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 32% on February 20.

Daily Chance of Precipitation at Gnoss Field

Daily Chance of Precipitation at Gnoss FieldwetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 2032%Feb 2032%Jul 240%Jul 240%Nov 216%Nov 216%Apr 816%Apr 816%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 8.5d8.8d7.7d4.1d2.2d0.7d0.2d0.2d0.8d3.0d6.4d8.8d

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. Gnoss Field experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 7.7 months, from September 30 to May 22, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain at Gnoss Field is February, with an average rainfall of 4.8 inches.

The rainless period of the year lasts for 4.3 months, from May 22 to September 30. The month with the least rain at Gnoss Field is July, with an average rainfall of 0.0 inches.

Average Monthly Rainfall at Gnoss Field

Average Monthly Rainfall at Gnoss FieldrainrainJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 inFeb 154.8 inFeb 154.8 inJul 300.0 inJul 300.0 inDec 284.5 inDec 284.5 inSep 300.5 inSep 300.5 inMay 220.5 inMay 220.5 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 4.3″4.8″3.2″1.3″0.6″0.2″0.0″0.0″0.2″1.2″3.0″4.5″

The length of the day at Gnoss Field varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 31 minutes of daylight; the longest day is June 20, with 14 hours, 49 minutes of daylight.

Hours of Daylight and Twilight at Gnoss Field

Hours of Daylight and Twilight at Gnoss FieldJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 1912 hr, 8 minMar 1914 hr, 49 minJun 2014 hr, 49 minJun 2012 hr, 10 minSep 2212 hr, 10 minSep 229 hr, 31 minDec 219 hr, 31 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 9.9h10.8h12.0h13.2h14.3h14.8h14.5h13.6h12.4h11.2h10.1h9.6h

The earliest sunrise is at 5:46 AM on June 13, and the latest sunrise is 1 hour, 51 minutes later at 7:37 AM on November 2. The earliest sunset is at 4:50 PM on December 5, and the latest sunset is 3 hours, 47 minutes later at 8:37 PM on June 27.

Daylight saving time (DST) is observed at Gnoss Field 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 at Gnoss Field

Sunrise & Sunset with Twilight and Daylight Saving Time at Gnoss FieldJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 135:46 AMJun 135:46 AM8:37 PMJun 278:37 PMJun 27Dec 54:50 PMDec 54:50 PM7:37 AMNov 27:37 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 at Gnoss Field

Solar Elevation and Azimuth at Gnoss FieldJanFebMarAprMayJunJulAugSepOctNovDec12 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 AM0001010101020202030303040404050506060700001010102020202030304040505060702875NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

Moon Rise, Set & Phases at Gnoss Field

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 at Gnoss Field, 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 at Gnoss Field

Humidity Comfort Levels at Gnoss FieldJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Dec 30%Dec 30%Jul 40%Jul 40%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 0.0d0.0d0.0d0.0d0.0d0.1d0.1d0.0d0.1d0.0d0.0d0.0d

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 at Gnoss Field experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.4 months, from February 13 to July 25, with average wind speeds of more than 7.6 miles per hour. The windiest month of the year at Gnoss Field is May, with an average hourly wind speed of 8.4 miles per hour.

The calmer time of year lasts for 6.6 months, from July 25 to February 13. The calmest month of the year at Gnoss Field is October, with an average hourly wind speed of 6.7 miles per hour.

Average Wind Speed at Gnoss Field

Average Wind Speed at Gnoss FieldwindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mphMay 298.5 mphMay 298.5 mphOct 206.7 mphOct 206.7 mphFeb 137.6 mphFeb 137.6 mphJul 257.6 mphJul 257.6 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) 7.47.67.98.28.48.47.87.47.06.77.17.7

The predominant average hourly wind direction at Gnoss Field varies throughout the year.

The wind is most often from the west for 8.8 months, from February 15 to November 9, with a peak percentage of 90% on July 30. The wind is most often from the north for 3.2 months, from November 9 to February 15, with a peak percentage of 39% on January 1.

Wind Direction at Gnoss Field

Wind Direction at Gnoss FieldNWNJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestnorthsoutheast
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).

Gnoss Field 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 2.4 months, from August 9 to October 22, with an average temperature above 56°F. The month of the year at Gnoss Field with the warmest water is September, with an average temperature of 57°F.

The time of year with cooler water lasts for 3.1 months, from March 18 to June 22, with an average temperature below 53°F. The month of the year at Gnoss Field with the coolest water is May, with an average temperature of 52°F.

Average Water Temperature at Gnoss Field

Average Water Temperature at Gnoss FieldwarmcoolJanFebMarAprMayJunJulAugSepOctNovDec48°F48°F50°F50°F52°F52°F54°F54°F56°F56°F58°F58°F60°F60°F62°F62°FSep 1857°FSep 1857°F52°FMay 1152°FMay 11Aug 956°FAug 956°FOct 2256°FOct 2256°FMar 1853°FMar 1853°FJun 2253°FJun 2253°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 53°F53°F53°F52°F52°F53°F55°F57°F57°F57°F55°F54°F

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

Tourism Score at Gnoss Field

Tourism Score at Gnoss Fieldbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.36.30.70.7NowNowtemperaturetemperature 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 Gnoss Field for hot-weather activities is from mid June to mid September, with a peak score in the second week of July.

Beach/Pool Score at Gnoss Field

Beach/Pool Score at Gnoss Fieldbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810102.62.60.00.0NowNowtemperaturetemperature 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 at Gnoss Field typically lasts for 10 months (304 days), from around February 4 to around December 3, rarely starting after March 7, or ending before November 12.

Time Spent in Various Temperature Bands and the Growing Season at Gnoss Field

Time Spent in Various Temperature Bands and the Growing Season at Gnoss Fieldgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Feb 450%Feb 450%Dec 350%Dec 390%Mar 790%Mar 790%Nov 1290%Nov 1218%Dec 3018%Dec 30Jul 21100%Jul 21100%NowNowvery coldcoldcoolcomfortablewarmhot
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms at Gnoss Field should appear around February 13, only rarely appearing before February 2 or after February 29.

Growing Degree Days at Gnoss Field

Growing Degree Days at Gnoss FieldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°F3,000°F3,000°FFeb 1390°FFeb 1390°FJun 9900°FJun 9900°FAug 121,800°FAug 121,800°FDec 312,979°FDec 312,979°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 3.5 months, from May 7 to August 24, with an average daily incident shortwave energy per square meter above 7.2 kWh. The brightest month of the year at Gnoss Field is June, with an average of 8.2 kWh.

The darker period of the year lasts for 3.6 months, from November 2 to February 19, with an average daily incident shortwave energy per square meter below 3.3 kWh. The darkest month of the year at Gnoss Field is December, with an average of 2.1 kWh.

Average Daily Incident Shortwave Solar Energy at Gnoss Field

Average Daily Incident Shortwave Solar Energy at Gnoss FieldbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWh10 kWh10 kWhJun 288.4 kWhJun 288.4 kWhDec 252.1 kWhDec 252.1 kWhMay 77.2 kWhMay 77.2 kWhAug 247.2 kWhAug 247.2 kWhNov 23.3 kWhNov 23.3 kWhFeb 193.3 kWhFeb 193.3 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 2.43.24.76.27.48.28.27.46.04.32.82.1

For the purposes of this report, the geographical coordinates of Gnoss Field are 38.141 deg latitude, -122.557 deg longitude, and 3 ft elevation.

The topography within 2 miles of Gnoss Field contains very significant variations in elevation, with a maximum elevation change of 1,526 feet and an average elevation above sea level of 149 feet. Within 10 miles also contains very significant variations in elevation (1,880 feet). Within 50 miles contains very significant variations in elevation (4,701 feet).

The area within 2 miles of Gnoss Field is covered by herbaceous vegetation (47%) and grassland (34%), within 10 miles by grassland (44%) and cropland (12%), and within 50 miles by water (36%) and grassland (19%).

This report illustrates the typical weather at Gnoss Field, 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

Gnoss Field has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back include but are not limited to Napa County Airport, Sonoma County Airport, Naval Air Station Alameda (historical), Buchanan Field Airport, Oakland International Airport, San Francisco International Airport, Travis Air Force Base, and Nut Tree Airport.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

Please review our full terms contained on our Terms of Service page.