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Climate and Average Weather Year Round in Alfta Sweden

In Alfta, the summers are comfortable and partly cloudy and the winters are long, freezing, snowy, and mostly cloudy. Over the course of the year, the temperature typically varies from 14°F to 70°F and is rarely below -8°F or above 79°F.

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

Climate in Alfta

freezingvery coldcoldcoolcomfortablecoolcoldvery coldfreezingJanFebMarAprMayJunJulAugSepOctNovDecNowNow51%51%26%26%overcastclearprecipitation: 3.1 inprecipitation: 3.1 in0.9 in0.9 inmuggy: 1%muggy: 1%0%0%drydrytourism score: 6.1tourism score: 6.10.00.0
Alfta weather by month. Click on each chart for more information.

The warm season lasts for 3.3 months, from May 26 to September 3, with an average daily high temperature above 61°F. The hottest month of the year in Alfta is July, with an average high of 69°F and low of 50°F.

The cold season lasts for 3.9 months, from November 14 to March 10, with an average daily high temperature below 35°F. The coldest month of the year in Alfta is January, with an average low of 14°F and high of 27°F.

Average High and Low Temperature in Alfta

Average High and Low Temperature in AlftawarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec-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°FFeb 728°FFeb 728°FJul 2070°FJul 2070°F14°F14°F51°F51°FMay 2661°FMay 2661°FSep 361°FSep 361°FNov 1435°FNov 1435°FMar 1035°FMar 1035°F41°F41°F44°F44°F25°F25°F20°F20°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 27°F29°F37°F47°F58°F65°F69°F66°F58°F46°F35°F28°F
Temp. 21°F22°F29°F39°F49°F57°F61°F58°F50°F40°F30°F23°F
Low 14°F15°F21°F29°F38°F46°F50°F47°F41°F33°F25°F17°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 Alfta

Average Hourly Temperature in AlftaJanFebMarAprMayJunJulAugSepOctNovDec12 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 AMNowNowfreezingfreezingvery coldvery coldcoldcoolcomfortablecool
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.

Smithers, British Columbia, Canada (4,172 miles away); Golden, British Columbia, Canada (4,240 miles); and Breckenridge, Colorado, United States (4,761 miles) are the far-away foreign places with temperatures most similar to Alfta (view comparison).

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In Alfta, 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 Alfta begins around April 20 and lasts for 5.0 months, ending around September 19.

The clearest month of the year in Alfta is July, during which on average the sky is clear, mostly clear, or partly cloudy 51% of the time.

The cloudier part of the year begins around September 19 and lasts for 7.0 months, ending around April 20.

The cloudiest month of the year in Alfta is November, during which on average the sky is overcast or mostly cloudy 74% of the time.

Cloud Cover Categories in Alfta

Cloud Cover Categories in AlftaclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jul 1751%Jul 1751%Nov 926%Nov 926%Apr 2039%Apr 2039%Sep 1939%Sep 1939%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 72%71%68%62%53%51%49%54%61%70%74%71%
Clearer 28%29%32%38%47%49%51%46%39%30%26%29%

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

The wetter season lasts 6.5 months, from May 8 to November 24, with a greater than 26% chance of a given day being a wet day. The month with the most wet days in Alfta is August, with an average of 10.7 days with at least 0.04 inches of precipitation.

The drier season lasts 5.5 months, from November 24 to May 8. The month with the fewest wet days in Alfta is February, with an average of 5.0 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 Alfta changes throughout the year.

Rain alone is the most common for 8.4 months, from March 19 to December 1. The month with the most days of rain alone in Alfta is August, with an average of 10.7 days.

Snow alone is the most common for 3.5 months, from December 1 to March 19. The month with the most days of snow alone in Alfta is January, with an average of 3.9 days.

Daily Chance of Precipitation in Alfta

Daily Chance of Precipitation in AlftasnowrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Aug 1736%Aug 1736%Feb 2516%Feb 2516%Dec 125%Dec 125%May 826%May 826%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 1.3d0.9d2.1d5.1d7.9d9.7d10.2d10.7d8.5d7.4d4.7d2.1d
Mixed 1.3d1.0d1.4d1.1d0.4d0.0d0.0d0.0d0.0d0.8d1.5d1.2d
Snow 3.9d3.1d2.2d0.6d0.0d0.0d0.0d0.0d0.0d0.4d1.8d3.8d
Any 6.4d5.0d5.8d6.8d8.3d9.7d10.2d10.7d8.6d8.6d8.0d7.2d

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. Alfta experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 8.9 months, from March 17 to December 14, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Alfta is August, with an average rainfall of 3.1 inches.

The rainless period of the year lasts for 3.1 months, from December 14 to March 17. The month with the least rain in Alfta is February, with an average rainfall of 0.2 inches.

Average Monthly Rainfall in Alfta

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 0.3″0.2″0.5″1.3″2.1″2.8″3.0″3.1″2.4″1.9″1.2″0.5″

Snowfall

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

The snowy period of the year lasts for 6.7 months, from October 8 to April 29, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Alfta is January, with an average snowfall of 8.0 inches.

The snowless period of the year lasts for 5.3 months, from April 29 to October 8. The least snow falls around July 25, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall in Alfta

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 8.0″6.4″5.1″2.2″0.3″0.0″0.0″0.0″0.0″1.7″5.1″7.9″

The length of the day in Alfta varies extremely over the course of the year. In 2024, the shortest day is December 21, with 5 hours, 24 minutes of daylight; the longest day is June 20, with 19 hours, 26 minutes of daylight.

Hours of Daylight and Twilight in Alfta

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 6.5h9.0h11.9h14.8h17.6h19.3h18.3h15.7h12.9h10.0h7.2h5.6h

The earliest sunrise is at 3:14 AM on June 19, and the latest sunrise is 5 hours, 59 minutes later at 9:13 AM on December 26. The earliest sunset is at 2:34 PM on December 16, and the latest sunset is 8 hours, 6 minutes later at 10:40 PM on June 22.

Daylight saving time (DST) is observed in Alfta during 2024, starting in the spring on March 31, lasting 6.9 months, and ending in the fall on October 27.

Sunrise & Sunset with Twilight and Daylight Saving Time in Alfta

Sunrise & Sunset with Twilight and Daylight Saving Time in AlftaJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 193:14 AMJun 193:14 AM10:40 PMJun 2210:40 PMJun 22Dec 162:34 PMDec 162:34 PM9:13 AMDec 269:13 AMDec 26Mar 31DSTMar 31DSTDSTOct 27DSTOct 27daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
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 Alfta

Solar Elevation and Azimuth in AlftaJanFebMarAprMayJunJulAugSepOctNovDec12 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 AM00001010202030304050000101010202030304040552NowNow
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 Alfta

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 Alfta, 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 Alfta

Humidity Comfort Levels in AlftaJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Mar 140%Mar 140%Jul 231%Jul 231%NowNowdrydryhumidhumid
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 0.0d0.0d0.0d0.0d0.0d0.0d0.2d0.1d0.0d0.0d0.0d0.0d

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

The windier part of the year lasts for 6.1 months, from September 18 to March 21, with average wind speeds of more than 4.8 miles per hour. The windiest month of the year in Alfta is December, with an average hourly wind speed of 5.3 miles per hour.

The calmer time of year lasts for 5.9 months, from March 21 to September 18. The calmest month of the year in Alfta is July, with an average hourly wind speed of 4.3 miles per hour.

Average Wind Speed in Alfta

Average Wind Speed in AlftawindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mph8 mph8 mphJan 25.4 mphJan 25.4 mphAug 64.2 mphAug 64.2 mphSep 184.8 mphSep 184.8 mphMar 214.8 mphMar 214.8 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) 5.35.04.84.74.64.54.34.34.84.95.05.3

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

The wind is most often from the north for 1.1 weeks, from April 26 to May 4 and for 1.5 months, from May 10 to June 25, with a peak percentage of 30% on June 9. The wind is most often from the south for 6.0 days, from May 4 to May 10 and for 2.3 months, from June 25 to September 3, with a peak percentage of 33% on August 6. The wind is most often from the west for 7.8 months, from September 3 to April 26, with a peak percentage of 47% on January 1.

Wind Direction in Alfta

Wind Direction in AlftaWNSWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Alfta 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 significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.4 months, from July 1 to September 12, with an average temperature above 56°F. The month of the year in Alfta with the warmest water is August, with an average temperature of 60°F.

The time of year with cooler water lasts for 5.0 months, from December 4 to May 5, with an average temperature below 38°F. The month of the year in Alfta with the coolest water is February, with an average temperature of 33°F.

Average Water Temperature in Alfta

Average Water Temperature in AlftawarmcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec25°F25°F30°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°FAug 461°FAug 461°F33°FMar 233°FMar 2Jul 156°FJul 156°FSep 1256°FSep 1256°FDec 438°FDec 438°FMay 538°FMay 538°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 34°F33°F33°F35°F41°F51°F59°F60°F55°F48°F41°F37°F

To characterize how pleasant the weather is in Alfta 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 Alfta for general outdoor tourist activities is from late June to mid August, with a peak score in the third week of July.

Tourism Score in Alfta

Tourism Score in Alftabest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.16.10.00.0NowNowtemperaturetemperature 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 Alfta for hot-weather activities is for the entire month of July, with a peak score in the third week of July.

Beach/Pool Score in Alfta

Beach/Pool Score in AlftaJanFebMarAprMayJunJulAugSepOctNovDec002244668810102.32.30.00.0NowNow 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 Alfta typically lasts for 4.0 months (124 days), from around May 15 to around September 16, rarely starting before April 28 or after June 2, and rarely ending before August 29 or after October 6.

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

Time Spent in Various Temperature Bands and the Growing Season in Alftagrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 1550%May 1550%Sep 1650%Sep 1650%Jun 290%Jun 290%Aug 2990%Aug 2990%Apr 2810%Apr 2810%Oct 610%Oct 610%0%Feb 160%Feb 16Jul 26100%Jul 26100%NowNowfrigidfreezingvery 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.

Based on growing degree days alone, the first spring blooms in Alfta should appear around May 21, only rarely appearing before May 10 or after June 2.

Growing Degree Days in Alfta

Growing Degree Days in AlftaJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F200°F200°F400°F400°F600°F600°F800°F800°F1,000°F1,000°F1,200°F1,200°FMay 2190°FMay 2190°FAug 19900°FAug 19900°FDec 311,090°FDec 311,090°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 3.1 months, from May 4 to August 9, with an average daily incident shortwave energy per square meter above 4.7 kWh. The brightest month of the year in Alfta is June, with an average of 5.8 kWh.

The darker period of the year lasts for 4.4 months, from October 13 to February 25, with an average daily incident shortwave energy per square meter below 1.3 kWh. The darkest month of the year in Alfta is December, with an average of 0.1 kWh.

Average Daily Incident Shortwave Solar Energy in Alfta

Average Daily Incident Shortwave Solar Energy in AlftabrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhJun 195.8 kWhJun 195.8 kWhDec 190.1 kWhDec 190.1 kWhMay 44.7 kWhMay 44.7 kWhAug 94.7 kWhAug 94.7 kWhOct 131.3 kWhOct 131.3 kWhFeb 251.3 kWhFeb 251.3 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) 0.30.92.23.75.25.85.54.32.71.20.40.1

For the purposes of this report, the geographical coordinates of Alfta are 61.347 deg latitude, 16.075 deg longitude, and 322 ft elevation.

The topography within 2 miles of Alfta contains only modest variations in elevation, with a maximum elevation change of 325 feet and an average elevation above sea level of 383 feet. Within 10 miles contains only modest variations in elevation (1,394 feet). Within 50 miles contains very significant variations in elevation (2,365 feet).

The area within 2 miles of Alfta is covered by trees (49%), cropland (28%), and artificial surfaces (15%), within 10 miles by trees (79%) and cropland (11%), and within 50 miles by trees (79%) and water (14%).

This report illustrates the typical weather in Alfta, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Alfta.

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