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Climate and Average Weather Year Round in Prudhoe Bay Alaska, United States

In Prudhoe Bay, the summers are cold; the winters are long, frigid, snowy, and windy; and it is overcast year round. Over the course of the year, the temperature typically varies from -21°F to 54°F and is rarely below -40°F or above 67°F.

Based on the tourism score, the best time of year to visit Prudhoe Bay for warm-weather activities is from early July to early August.

Climate in Prudhoe Bay

frigidfreezingcoldfreezingfrigidJanFebMarAprMayJunJulAugSepOctNovDecNowNow35%35%10%10%overcastprecipitation: 1.2 inprecipitation: 1.2 in0.1 in0.1 inmuggy: 0%muggy: 0%drydrytourism score: 0.8tourism score: 0.80.00.0
Prudhoe Bay weather by month. Click on each chart for more information.

The warm season lasts for 3.0 months, from June 9 to September 9, with an average daily high temperature above 41°F. The hottest month of the year in Prudhoe Bay is July, with an average high of 53°F and low of 40°F.

The cold season lasts for 4.6 months, from November 19 to April 7, with an average daily high temperature below 4°F. The coldest month of the year in Prudhoe Bay is February, with an average low of -20°F and high of -8°F.

Average High and Low Temperature in Prudhoe Bay

Average High and Low Temperature in Prudhoe BaywarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec-40°F-40°F-20°F-20°F0°F0°F20°F20°F40°F40°F60°F60°F80°F80°F100°F100°FFeb 9-9°FFeb 9-9°FJul 2854°FJul 2854°F-21°F-21°F41°F41°FJun 941°FJun 941°FSep 941°FSep 941°FNov 194°FNov 194°FApr 74°FApr 74°F31°F31°F33°F33°F-7°F-7°F-10°F-10°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 -8°F-8°F-5°F10°F28°F45°F53°F49°F38°F22°F5°F-4°F
Temp. -14°F-15°F-13°F2°F23°F39°F46°F43°F34°F18°F-0°F-9°F
Low -19°F-20°F-18°F-3°F19°F34°F40°F38°F30°F13°F-6°F-15°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 Prudhoe Bay

Average Hourly Temperature in Prudhoe BayJanFebMarAprMayJunJulAugSepOctNovDec12 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 AMNowNowfrigidfrigidfreezingvery coldcoldfreezing
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.

Tosontsengel, Mongolia (3,578 miles away) and McMurdo Station, Antarctica (10,406 miles) are the far-away foreign places with temperatures most similar to Prudhoe Bay (view comparison).

Map
Marker
© Esri, et al.

Compare Prudhoe Bay to another city:

Map

In Prudhoe Bay, 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 Prudhoe Bay begins around May 1 and lasts for 5.5 months, ending around October 17.

The clearest month of the year in Prudhoe Bay is June, during which on average the sky is clear, mostly clear, or partly cloudy 33% of the time.

The cloudier part of the year begins around October 17 and lasts for 6.5 months, ending around May 1.

The cloudiest month of the year in Prudhoe Bay is January, during which on average the sky is overcast or mostly cloudy 89% of the time.

Cloud Cover Categories in Prudhoe Bay

Cloud Cover Categories in Prudhoe BayclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jun 2735%Jun 2735%Jan 2110%Jan 2110%May 122%May 122%Oct 1723%Oct 1723%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 89%89%88%83%73%67%69%74%73%77%84%87%
Clearer 11%11%12%17%27%33%31%26%27%23%16%13%

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

The wetter season lasts 3.1 months, from June 23 to September 27, with a greater than 12% chance of a given day being a wet day. The month with the most wet days in Prudhoe Bay is August, with an average of 6.5 days with at least 0.04 inches of precipitation.

The drier season lasts 8.9 months, from September 27 to June 23. The month with the fewest wet days in Prudhoe Bay is March, with an average of 0.7 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 Prudhoe Bay changes throughout the year.

Snow alone is the most common for 7.9 months, from September 26 to May 24. The month with the most days of snow alone in Prudhoe Bay is October, with an average of 1.3 days.

Rain alone is the most common for 4.1 months, from May 24 to September 26. The month with the most days of rain alone in Prudhoe Bay is August, with an average of 6.3 days.

Daily Chance of Precipitation in Prudhoe Bay

Daily Chance of Precipitation in Prudhoe BaysnowrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Aug 1722%Aug 1722%Mar 242%Mar 242%May 247%May 247%Sep 2612%Sep 2612%Jan 14%Jan 14%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 0.0d0.0d0.0d0.0d0.7d2.7d5.4d6.3d2.9d0.3d0.0d0.0d
Mixed 1.2d1.1d0.7d0.7d1.0d0.3d0.0d0.1d0.9d1.3d0.8d1.1d
Snow 0.0d0.0d0.0d0.0d0.3d0.3d0.0d0.1d0.6d0.3d0.0d0.0d
Any 1.2d1.2d0.7d0.7d2.0d3.3d5.4d6.5d4.4d1.9d0.9d1.1d

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. Prudhoe Bay experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 3.1 months, from June 13 to September 18, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Prudhoe Bay is August, with an average rainfall of 1.2 inches.

The rainless period of the year lasts for 8.9 months, from September 18 to June 13. The month with the least rain in Prudhoe Bay is March, with an average rainfall of 0.0 inches.

Average Monthly Rainfall in Prudhoe Bay

Average Monthly Rainfall in Prudhoe BayrainJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 inAug 101.2 inAug 101.2 inMar 210.0 inMar 210.0 inFeb 130.0 inFeb 130.0 inJun 130.5 inJun 130.5 inSep 180.5 inSep 180.5 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 0.0″0.0″0.0″0.0″0.2″0.5″1.0″1.2″0.6″0.1″0.0″0.0″

Snowfall

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

The snowy period of the year lasts for 9.2 months, from September 3 to June 11, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Prudhoe Bay is October, with an average snowfall of 2.0 inches.

The snowless period of the year lasts for 2.8 months, from June 11 to September 3. The least snow falls around July 14, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall in Prudhoe Bay

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 1.4″1.3″0.8″0.9″1.5″0.8″0.0″0.3″1.7″2.0″1.1″1.3″

Due to its extreme latitude, Prudhoe Bay experiences polar day (also known as the midnight Sun) during the summer and polar night during the winter. These are periods of time in which the sun is continuously above or below the horizon for more than one day. The precise start and end dates of polar day and night vary from year to year and depend on the precise location and elevation of the observer, and the local topography.

In the summer in Prudhoe Bay during 2022, the Sun is continuously above the horizon for 2.4 months, rising at 1:50 AM on May 15, and not setting again until 1:26 AM on July 29.

In the winter in Prudhoe Bay during 2022, the Sun is continuously below the horizon for 1.8 months, setting at 1:02 PM on November 23, and not rising again until 12:32 PM on January 18.

Hours of Daylight and Twilight in Prudhoe Bay

Hours of Daylight and Twilight in Prudhoe Baypolar dayJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 13 minMar 2012 hr, 13 minMar 2024 hr, 0 minJun 2124 hr, 0 minJun 2112 hr, 21 minSep 2212 hr, 21 minSep 220 minDec 210 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 1.4h7.3h11.9h16.6h22.7h24.0h23.7h18.0h13.2h8.6h2.9h0.0h

Daylight saving time (DST) is observed in Prudhoe Bay during 2022, starting in the spring on March 13, lasting 7.8 months, and ending in the fall on November 6.

Sunrise & Sunset with Twilight and Daylight Saving Time in Prudhoe Bay

Sunrise & Sunset with Twilight and Daylight Saving Time in Prudhoe BayJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM2 AMMay 151:50 AMMay 151:50 AM1:26 AMJul 281:26 AMJul 281:02 PMNov 231:02 PMNov 23Jan 1812:32 PMJan 1812:32 PMMar 13DSTMar 13DSTdaynightnightnightnightSolarMidnightSolarMidnightSolarNoon
The solar day over the course of the year 2022. 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 key lunar data for 2022. 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 Prudhoe Bay

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 Prudhoe Bay, 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 Prudhoe Bay

Humidity Comfort Levels in Prudhoe BayJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jul 30%Jul 30%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 Prudhoe Bay experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 7.9 months, from September 17 to May 14, with average wind speeds of more than 11.1 miles per hour. The windiest month of the year in Prudhoe Bay is January, with an average hourly wind speed of 12.6 miles per hour.

The calmer time of year lasts for 4.1 months, from May 14 to September 17. The calmest month of the year in Prudhoe Bay is July, with an average hourly wind speed of 9.5 miles per hour.

Average Wind Speed in Prudhoe Bay

Average Wind Speed in Prudhoe BaywindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mph20 mph20 mph22 mph22 mphJan 1212.9 mphJan 1212.9 mphJul 299.3 mphJul 299.3 mphSep 1711.1 mphSep 1711.1 mphMay 1411.1 mphMay 1411.1 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) 12.612.411.911.711.010.09.59.811.111.611.612.0

The predominant average hourly wind direction in Prudhoe Bay is from the east throughout the year.

Wind Direction in Prudhoe Bay

Wind Direction in Prudhoe BayJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwesteastnorthsouth
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).

Prudhoe Bay 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 1.7 months, from July 22 to September 11, with an average temperature above 34°F. The month of the year in Prudhoe Bay with the warmest water is August, with an average temperature of 36°F.

The time of year with cooler water lasts for 7.5 months, from October 22 to June 8, with an average temperature below 30°F. The month of the year in Prudhoe Bay with the coolest water is February, with an average temperature of 29°F.

Average Water Temperature in Prudhoe Bay

Average Water Temperature in Prudhoe BaywarmcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec28°F28°F30°F30°F32°F32°F34°F34°F36°F36°F38°F38°F40°F40°FAug 1736°FAug 1736°F29°FFeb 929°FFeb 9Oct 2230°FOct 2230°FJun 830°FJun 830°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 29°F29°F29°F29°F29°F31°F34°F36°F34°F31°F29°F29°F

To characterize how pleasant the weather is in Prudhoe Bay 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 Prudhoe Bay for general outdoor tourist activities is from early July to early August, with a peak score in the last week of July.

Tourism Score in Prudhoe Bay

Tourism Score in Prudhoe BayJanFebMarAprMayJunJulAugSepOctNovDec002244668810100.80.80.00.0NowNowprecipitationprecipitationcloudscloudstemperaturetemperature
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 Prudhoe Bay for hot-weather activities is from mid to late July.

Beach/Pool Score in Prudhoe Bay

Beach/Pool Score in Prudhoe BayJanFebMarAprMayJunJulAugSepOctNovDec002244668810100.00.00.00.0NowNowprecipitationprecipitationcloudsclouds
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 Prudhoe Bay typically lasts for 1.7 months (51 days), from around June 28 to around August 18, rarely starting before June 7, or ending after September 8.

Time Spent in Various Temperature Bands and the Growing Season in Prudhoe Bay

Time Spent in Various Temperature Bands and the Growing Season in Prudhoe BayJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jun 2850%Jun 2850%Aug 1850%Aug 1850%Jun 710%Jun 710%Sep 810%Sep 810%0%Nov 170%Nov 17Jul 2881%Jul 2881%NowNowfrigidvery coldcoldcoolfreezing
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 Prudhoe Bay

Growing Degree Days in Prudhoe BayJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F20°F20°F40°F40°F60°F60°F80°F80°F100°F100°F120°F120°F140°F140°F160°F160°F180°F180°FAug 1090°FAug 1090°FDec 31112°FDec 31112°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 6 to July 21, with an average daily incident shortwave energy per square meter above 4.7 kWh. The brightest month of the year in Prudhoe Bay is June, with an average of 5.8 kWh.

The darker period of the year lasts for 5.5 months, from September 28 to March 12, with an average daily incident shortwave energy per square meter below 1.2 kWh. The darkest month of the year in Prudhoe Bay is December, with an average of 0.0 kWh.

Average Daily Incident Shortwave Solar Energy in Prudhoe Bay

Average Daily Incident Shortwave Solar Energy in Prudhoe BaybrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhJun 145.9 kWhJun 145.9 kWhJan 10.0 kWhJan 10.0 kWhMay 64.7 kWhMay 64.7 kWhJul 214.7 kWhJul 214.7 kWhSep 281.2 kWhSep 281.2 kWhMar 121.2 kWhMar 121.2 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 0.00.31.53.45.25.84.93.11.70.50.00.0

For the purposes of this report, the geographical coordinates of Prudhoe Bay are 70.255 deg latitude, -148.337 deg longitude, and 46 ft elevation.

The topography within 2 miles of Prudhoe Bay is essentially flat, with a maximum elevation change of 59 feet and an average elevation above sea level of 39 feet. Within 10 miles is also essentially flat (82 feet). Within 50 miles is essentially flat (965 feet).

The area within 2 miles of Prudhoe Bay is covered by sparse vegetation (56%), herbaceous vegetation (21%), and water (13%), within 10 miles by sparse vegetation (31%) and water (28%), and within 50 miles by water (45%) and grassland (33%).

This report illustrates the typical weather in Prudhoe Bay, 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 Prudhoe Bay.

For each station, the records are corrected for the elevation difference between that station and Prudhoe Bay 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 Prudhoe Bay is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Prudhoe Bay 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 Prudhoe Bay 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 © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

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.