September Weather in Langegg bei Graz AustriaDaily high temperatures decrease by 8°F, from 72°F to 64°F, rarely falling below 54°F or exceeding 81°F. Daily low temperatures decrease by 7°F, from 52°F to 45°F, rarely falling below 37°F or exceeding 59°F. For reference, on July 30, the hottest day of the year, temperatures in Langegg bei Graz typically range from 57°F to 78°F, while on January 13, the coldest day of the year, they range from 21°F to 34°F. The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. 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. Terra Alta, United States (4,518 miles away) is the far-away foreign place with temperatures most similar to Langegg bei Graz (view comparison). CloudsThe month of September in Langegg bei Graz experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 40% to 47%. The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 60% of the time. For reference, on December 5, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 59%, while on July 21, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 65%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Langegg bei Graz, the chance of a wet day over the course of September is very rapidly decreasing, starting the month at 30% and ending it at 22%. For reference, the year's highest daily chance of a wet day is 39% on June 15, and its lowest chance is 11% on January 13. 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 September in Langegg bei Graz is decreasing, starting the month at 3.1 inches, when it rarely exceeds 5.0 inches or falls below 1.6 inches, and ending the month at 2.4 inches, when it rarely exceeds 4.4 inches or falls below 0.9 inches. SunOver the course of September in Langegg bei Graz, 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, 36 minutes, implying an average daily decrease of 3 minutes, 19 seconds, and weekly decrease of 23 minutes, 14 seconds. The shortest day of the month is September 30, with 11 hours, 43 minutes of daylight and the longest day is September 1, with 13 hours, 19 minutes of daylight. The earliest sunrise of the month in Langegg bei Graz is 6:17 AM on September 1 and the latest sunrise is 38 minutes later at 6:55 AM on September 30. The latest sunset is 7:36 PM on September 1 and the earliest sunset is 58 minutes earlier at 6:38 PM on September 30. Daylight saving time is observed in Langegg bei Graz during 2024, but it neither starts nor ends during September, so the entire month is in standard time. For reference, on June 20, the longest day of the year, the Sun rises at 5:02 AM and sets 15 hours, 54 minutes later, at 8:56 PM, while on December 21, the shortest day of the year, it rises at 7:40 AM and sets 8 hours, 30 minutes later, at 4:10 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 September 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 Langegg bei Graz is gradually decreasing during September, falling from 2% to 0% over the course of the month. For reference, on July 26, the muggiest day of the year, there are muggy conditions 10% of the time, while on October 10, 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 Langegg bei Graz is essentially constant during September, remaining within 0.1 miles per hour of 5.5 miles per hour throughout. For reference, on April 2, the windiest day of the year, the daily average wind speed is 6.9 miles per hour, while on August 9, the calmest day of the year, the daily average wind speed is 5.2 miles per hour. The highest daily average wind speed during September is 5.6 miles per hour on September 11. The wind direction in Langegg bei Graz during September is predominantly out of the north from September 1 to September 23 and the south from September 23 to September 30. 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 Langegg bei Graz typically lasts for 6.1 months (187 days), from around April 15 to around October 18, rarely starting before March 27 or after May 2, and rarely ending before October 1 or after November 8. The month of September in Langegg bei Graz is very likely fully within the growing season, with the chance that a given day is in the growing season gradually decreasing from 100% to 92% over the course of the month. 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 Langegg bei Graz are increasing during September, increasing by 252°F, from 1,861°F to 2,113°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 Langegg bei Graz is decreasing during September, falling by 1.4 kWh, from 5.0 kWh to 3.6 kWh, over the course of the month. TopographyFor the purposes of this report, the geographical coordinates of Langegg bei Graz are 47.050 deg latitude, 15.633 deg longitude, and 1,604 ft elevation. The topography within 2 miles of Langegg bei Graz contains only modest variations in elevation, with a maximum elevation change of 479 feet and an average elevation above sea level of 1,483 feet. Within 10 miles contains only modest variations in elevation (1,358 feet). Within 50 miles contains very significant variations in elevation (7,365 feet). The area within 2 miles of Langegg bei Graz is covered by trees (49%), cropland (32%), and grassland (18%), within 10 miles by cropland (45%) and trees (37%), and within 50 miles by trees (54%) and cropland (30%). Data SourcesThis report illustrates the typical weather in Langegg bei Graz, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Temperature and Dew PointThere are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Langegg bei Graz. For each station, the records are corrected for the elevation difference between that station and Langegg bei Graz 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 Langegg bei Graz is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Langegg bei Graz 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 Langegg bei Graz 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 DataAll 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. 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. Please review our full terms contained on our Terms of Service page. |