Average Weather in September in Langnau Switzerland
Daily low temperatures decrease by 6°F, from 48°F to 42°F, rarely falling below 35°F or exceeding 54°F.
For reference, on August 4, the hottest day of the year, temperatures in Langnau typically range from 52°F to 72°F, while on January 12, the coldest day of the year, they range from 23°F to 33°F.
Average High and Low Temperature in September
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.
Average Hourly Temperature in September
The month of September in Langnau experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 43% to 54%.
The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 57% of the time.
For reference, on May 8, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 60%, while on July 23, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 63%.
Cloud Cover Categories in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Langnau, the chance of a wet day over the course of September is essentially constant, remaining around 33% throughout.
For reference, the year's highest daily chance of a wet day is 46% on May 27, and its lowest chance is 27% on March 3.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Langnau is gradually decreasing, starting the month at 3.6 inches, when it rarely exceeds 5.5 inches or falls below 1.9 inches, and ending the month at 3.2 inches, when it rarely exceeds 5.4 inches or falls below 1.3 inches.
Average Monthly Rainfall in September
Over the course of September in Langnau, 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, 18 seconds, and weekly decrease of 23 minutes, 8 seconds.
The shortest day of the month is September 30, with 11 hours, 44 minutes of daylight and the longest day is September 1, with 13 hours, 20 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Langnau is 6:48 AM on September 1 and the latest sunrise is 38 minutes later at 7:26 AM on September 30.
The latest sunset is 8:08 PM on September 1 and the earliest sunset is 58 minutes earlier at 7:10 PM on September 30.
Daylight saving time is observed in Langnau during 2017, but it neither starts nor ends during September, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:34 AM and sets 15 hours, 53 minutes later, at 9:27 PM, while on December 21, the shortest day of the year, it rises at 8:11 AM and sets 8 hours, 31 minutes later, at 4:42 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in September
The chance that a given day will be muggy in Langnau is essentially constant during September, remaining around 0% throughout.
For reference, on July 14, the muggiest day of the year, there are muggy conditions 2% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in September
The average hourly wind speed in Langnau is essentially constant during September, remaining within 0.1 miles per hour of 5.2 miles per hour throughout.
For reference, on January 29, the windiest day of the year, the daily average wind speed is 6.4 miles per hour, while on August 10, the calmest day of the year, the daily average wind speed is 4.9 miles per hour.
Average Wind Speed in September
Wind Direction in September
The growing season in Langnau typically lasts for 5.4 months (164 days), from around May 3 to around October 14, rarely starting before April 13 or after May 25, and rarely ending before September 21 or after November 4.
The month of September in Langnau is more likely than not fully within the growing season, with the chance that a given day is in the growing season rapidly decreasing from 99% to 79% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in September
The average accumulated growing degree days in Langnau are gradually increasing during September, increasing by 153°F, from 1,146°F to 1,299°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Langnau is decreasing during September, falling by 1.5 kWh, from 5.2 kWh to 3.7 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of Langnau are 46.939 deg latitude, 7.787 deg longitude, and 2,641 ft elevation.
The topography within 2 miles of Langnau contains very significant variations in elevation, with a maximum elevation change of 1,375 feet and an average elevation above sea level of 2,600 feet. Within 10 miles contains very significant variations in elevation (3,875 feet). Within 50 miles also contains extreme variations in elevation (13,156 feet).
The area within 2 miles of Langnau is covered by grassland (45%), trees (35%), and cropland (12%), within 10 miles by trees (43%) and cropland (29%), and within 50 miles by trees (31%) and cropland (26%).
This report illustrates the typical weather in Langnau year round, 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Langnau.
For each station, the records are corrected for the elevation difference between that station and Langnau 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 Langnau is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Langnau and a given station.
The stations contributing to this reconstruction are: Bern-Belp Airport (41%, 22 kilometers, west); Interlaken Airport (37%, 33 kilometers, southeast); and Emmen Air Base (22%, 43 kilometers, northeast).
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.
Time zones for aiports and weather stations are provided by AskGeo.com .