Average Weather in September in Sallanches France
Daily high temperatures decrease by 8°F, from 69°F to 61°F, rarely falling below 53°F or exceeding 78°F.
Daily low temperatures decrease by 6°F, from 49°F to 43°F, rarely falling below 37°F or exceeding 55°F.
For reference, on July 26, the hottest day of the year, temperatures in Sallanches typically range from 53°F to 74°F, while on January 12, the coldest day of the year, they range from 21°F to 34°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 Sallanches 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 61%, while on July 23, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 64%.
Cloud Cover Categories in September
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Sallanches, the chance of a wet day over the course of September is essentially constant, remaining around 29% throughout.
For reference, the year's highest daily chance of a wet day is 40% on May 27, and its lowest chance is 24% on March 3.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Sallanches is essentially constant, remaining about 2.9 inches throughout, and rarely exceeding 5.5 inches or falling below 1.0 inches.
Average Monthly Rainfall in September
Over the course of September in Sallanches, 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, 33 minutes, implying an average daily decrease of 3 minutes, 11 seconds, and weekly decrease of 22 minutes, 20 seconds.
The shortest day of the month is September 30, with 11 hours, 46 minutes of daylight and the longest day is September 1, with 13 hours, 19 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Sallanches is 6:53 AM on September 1 and the latest sunrise is 36 minutes later at 7:29 AM on September 30.
The latest sunset is 8:12 PM on September 1 and the earliest sunset is 56 minutes earlier at 7:16 PM on September 30.
Daylight saving time is observed in Sallanches during 2019, 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 5:42 AM and sets 15 hours, 45 minutes later, at 9:27 PM, while on December 22, the shortest day of the year, it rises at 8:12 AM and sets 8 hours, 39 minutes later, at 4:51 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in September
The chance that a given day will be muggy in Sallanches is essentially constant during September, remaining around 0% throughout.
For reference, on July 6, the muggiest day of the year, there are muggy conditions 0% 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
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Sallanches is essentially constant during September, remaining around 4.0 miles per hour throughout.
For reference, on January 26, the windiest day of the year, the daily average wind speed is 4.5 miles per hour, while on August 10, the calmest day of the year, the daily average wind speed is 3.9 miles per hour.
Average Wind Speed in September
Wind Direction in September
The growing season in Sallanches typically lasts for 5.8 months (178 days), from around April 24 to around October 19, rarely starting before April 4 or after May 18, and rarely ending before September 30 or after November 7.
The month of September in Sallanches is more likely than not fully within the growing season, with the chance that a given day is in the growing season decreasing from 100% to 90% 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 Sallanches are increasing during September, increasing by 200°F, from 1,353°F to 1,552°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Sallanches is rapidly decreasing during September, falling by 1.6 kWh, from 5.5 kWh to 3.9 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 Sallanches are 45.944 deg latitude, 6.632 deg longitude, and 3,140 ft elevation.
The topography within 2 miles of Sallanches contains extreme variations in elevation, with a maximum elevation change of 3,780 feet and an average elevation above sea level of 2,637 feet. Within 10 miles also contains extreme variations in elevation (7,648 feet). Within 50 miles also contains extreme variations in elevation (14,997 feet).
The area within 2 miles of Sallanches is covered by trees (36%), artificial surfaces (28%), and cropland (27%), within 10 miles by trees (43%) and grassland (23%), and within 50 miles by trees (36%) and grassland (22%).
This report illustrates the typical weather in Sallanches 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Sallanches.
For each station, the records are corrected for the elevation difference between that station and Sallanches 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 Sallanches is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Sallanches and a given station.
The stations contributing to this reconstruction are: Annecy-Meythet (29%, 41 kilometers, west); Aéroport Genève-Cointrin (24%, 52 kilometers, northwest); Aosta Airport (24%, 60 kilometers, southeast); and Sion (22%, 61 kilometers, northeast).
Time zones for aiports and weather stations are provided by AskGeo.com .