July Weather in Aland Islands Åland IslandsDaily high temperatures increase by 3°F, from 65°F to 68°F, rarely falling below 58°F or exceeding 76°F. The highest daily average high temperature is 68°F on July 24. Daily low temperatures increase by 3°F, from 51°F to 54°F, rarely falling below 44°F or exceeding 61°F. The highest daily average low temperature is 54°F on July 24. For reference, on July 24, the hottest day of the year, temperatures in Aland Islands typically range from 54°F to 68°F, while on February 10, the coldest day of the year, they range from 21°F to 31°F. The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on July. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day. CloudsThe month of July in Aland Islands experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 43% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 41% on July 10. The clearest day of the month is July 10, with clear, mostly clear, or partly cloudy conditions 59% of the time. For reference, on January 26, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 71%, while on July 10, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 59%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Aland Islands, the chance of a wet day over the course of July is gradually increasing, starting the month at 21% and ending it at 24%. For reference, the year's highest daily chance of a wet day is 31% on November 28, and its lowest chance is 16% on March 27. RainfallTo show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day. The average sliding 31-day rainfall during July in Aland Islands is essentially constant, remaining about 1.9 inches throughout, and rarely exceeding 3.9 inches or falling below 0.6 inches. SunOver the course of July in Aland Islands, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 52 minutes, implying an average daily decrease of 3 minutes, 43 seconds, and weekly decrease of 26 minutes, 3 seconds. The shortest day of the month is July 31, with 16 hours, 56 minutes of daylight and the longest day is July 1, with 18 hours, 48 minutes of daylight. The earliest sunrise of the month in Aland Islands is 4:19 AM on July 1 and the latest sunrise is 58 minutes later at 5:17 AM on July 31. The latest sunset is 11:07 PM on July 1 and the earliest sunset is 54 minutes earlier at 10:13 PM on July 31. Daylight saving time is observed in Aland Islands during 2024, but it neither starts nor ends during July, so the entire month is in standard time. For reference, on June 20, the longest day of the year, the Sun rises at 4:12 AM and sets 18 hours, 58 minutes later, at 11:10 PM, while on December 21, the shortest day of the year, it rises at 9:44 AM and sets 5 hours, 47 minutes later, at 3:31 PM. 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. MoonThe figure below presents a compact representation of key lunar data for July 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. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.
HumidityWe 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 chance that a given day will be muggy in Aland Islands is essentially constant during July, remaining within 1% of 2% throughout. The highest chance of a muggy day during July is 2% on July 29. For reference, on July 29, the muggiest day of the year, there are muggy conditions 2% of the time, while on September 16, the least muggy day of the year, there are muggy conditions 0% of the time. WindThis 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 Aland Islands is essentially constant during July, remaining within 0.2 miles per hour of 11.5 miles per hour throughout. For reference, on December 14, the windiest day of the year, the daily average wind speed is 17.6 miles per hour, while on July 8, the calmest day of the year, the daily average wind speed is 11.3 miles per hour. The lowest daily average wind speed during July is 11.3 miles per hour on July 8. The hourly average wind direction in Aland Islands throughout July is predominantly from the south, with a peak proportion of 41% on July 23. Water TemperatureAland Islands 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 surface water temperature in Aland Islands is increasing during July, rising by 6°F, from 56°F to 62°F, over the course of the month. Growing SeasonDefinitions 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 Aland Islands typically lasts for 4.5 months (138 days), from around May 16 to around October 1, rarely starting before April 28 or after June 3, and rarely ending before September 13 or after October 19. The month of July in Aland Islands is reliably fully 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. The average accumulated growing degree days in Aland Islands are increasing during July, increasing by 347°F, from 285°F to 632°F, over the course of the month. Solar EnergyThis 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 in Aland Islands is gradually decreasing during July, falling by 1.0 kWh, from 6.6 kWh to 5.6 kWh, over the course of the month. TopographyFor the purposes of this report, the geographical coordinates of Aland Islands are 60.250 deg latitude, 20.000 deg longitude, and 0 ft elevation. The topography within 2 miles of Aland Islands is essentially flat, with a maximum elevation change of 0 feet and an average elevation above sea level of 0 feet. Within 10 miles is also essentially flat (0 feet). Within 50 miles is also essentially flat (0 feet). The area within 2 miles of Aland Islands is covered by trees (59%), cropland (16%), and water (15%), within 10 miles by trees (54%) and water (27%), and within 50 miles by water (89%). Data SourcesThis report illustrates the typical weather in Aland Islands, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. The details of the data sources used for this report can be found on the Mariehamn Airport page. DisclaimerThe 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. 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