Average Weather in September in Les Rosiers-sur-Loire France
Daily high temperatures decrease by 7°F, from 75°F to 68°F, rarely falling below 60°F or exceeding 84°F.
Daily low temperatures decrease by 4°F, from 55°F to 51°F, rarely falling below 43°F or exceeding 61°F.
For reference, on August 4, the hottest day of the year, temperatures in Les Rosiers-sur-Loire typically range from 58°F to 78°F, while on February 8, the coldest day of the year, they range from 36°F to 48°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 Les Rosiers-sur-Loire experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 41% to 49%.
The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 59% of the time.
For reference, on January 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 72%, while on July 24, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 66%.
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 Les Rosiers-sur-Loire, the chance of a wet day over the course of September is rapidly increasing, starting the month at 19% and ending it at 26%.
For reference, the year's highest daily chance of a wet day is 32% on December 28, and its lowest chance is 16% on August 24.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Les Rosiers-sur-Loire is increasing, starting the month at 1.3 inches, when it rarely exceeds 2.6 inches or falls below 0.3 inches, and ending the month at 1.9 inches, when it rarely exceeds 3.9 inches or falls below 0.4 inches.
Average Monthly Rainfall in September
Over the course of September in Les Rosiers-sur-Loire, 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, 37 minutes, implying an average daily decrease of 3 minutes, 21 seconds, and weekly decrease of 23 minutes, 28 seconds.
The shortest day of the month is September 30, with 11 hours, 45 minutes of daylight and the longest day is September 1, with 13 hours, 23 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Les Rosiers-sur-Loire is 7:19 AM on September 1 and the latest sunrise is 39 minutes later at 7:57 AM on September 30.
The latest sunset is 8:41 PM on September 1 and the earliest sunset is 59 minutes earlier at 7:43 PM on September 30.
Daylight saving time is observed in Les Rosiers-sur-Loire 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 6:04 AM and sets 15 hours, 57 minutes later, at 10:01 PM, while on December 22, the shortest day of the year, it rises at 8:45 AM and sets 8 hours, 28 minutes later, at 5:13 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in September
The chance that a given day will be muggy in Les Rosiers-sur-Loire is gradually decreasing during September, falling from 3% to 0% over the course of the month.
For reference, on August 3, the muggiest day of the year, there are muggy conditions 6% 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 Les Rosiers-sur-Loire is essentially constant during September, remaining within 0.2 miles per hour of 9.0 miles per hour throughout.
For reference, on January 16, the windiest day of the year, the daily average wind speed is 11.2 miles per hour, while on August 5, the calmest day of the year, the daily average wind speed is 8.1 miles per hour.
Average Wind Speed in September
Wind Direction in September
The growing season in Les Rosiers-sur-Loire typically lasts for 7.6 months (233 days), from around March 26 to around November 14, rarely starting before February 20 or after April 18, and rarely ending before October 22 or after December 18.
The month of September in Les Rosiers-sur-Loire is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in September
The average accumulated growing degree days in Les Rosiers-sur-Loire are increasing during September, increasing by 349°F, from 1,967°F to 2,317°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Les Rosiers-sur-Loire is rapidly decreasing during September, falling by 1.6 kWh, from 5.2 kWh to 3.5 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 Les Rosiers-sur-Loire are 47.350 deg latitude, -0.217 deg longitude, and 72 ft elevation.
The topography within 2 miles of Les Rosiers-sur-Loire contains only modest variations in elevation, with a maximum elevation change of 223 feet and an average elevation above sea level of 104 feet. Within 10 miles also contains only modest variations in elevation (335 feet). Within 50 miles contains only modest variations in elevation (1,066 feet).
The area within 2 miles of Les Rosiers-sur-Loire is covered by cropland (63%) and trees (13%), within 10 miles by cropland (65%) and trees (19%), and within 50 miles by cropland (59%) and grassland (21%).
This report illustrates the typical weather in Les Rosiers-sur-Loire 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 Les Rosiers-sur-Loire.
For each station, the records are corrected for the elevation difference between that station and Les Rosiers-sur-Loire 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 Les Rosiers-sur-Loire is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Les Rosiers-sur-Loire and a given station.
The stations contributing to this reconstruction are: Angers – Loire Airport (50%, 24 kilometers, north); Angers-Avrillé (33%, 32 kilometers, northwest); Tours Val de Loire Airport (10%, 72 kilometers, east); and Poitiers–Biard Airport (7%, 94 kilometers, southeast).
Time zones for aiports and weather stations are provided by AskGeo.com .