Average Weather in August in Sainte-Hélène-sur-Isère France
Daily high temperatures decrease by 4°F, from 79°F to 75°F, rarely falling below 66°F or exceeding 87°F. The highest daily average high temperature is 79°F on August 5.
Daily low temperatures decrease by 4°F, from 58°F to 54°F, rarely falling below 48°F or exceeding 64°F.
For reference, on August 4, the hottest day of the year, temperatures in Sainte-Hélène-sur-Isère typically range from 58°F to 79°F, while on January 12, the coldest day of the year, they range from 27°F to 40°F.
Average High and Low Temperature in August
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on August. 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 August
The month of August in Sainte-Hélène-sur-Isère experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 33% to 40%.
The clearest day of the month is August 1, with clear, mostly clear, or partly cloudy conditions 67% of the time.
For reference, on May 8, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 59%, while on July 22, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 68%.
Cloud Cover Categories in August
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 Sainte-Hélène-sur-Isère, the chance of a wet day over the course of August is gradually decreasing, starting the month at 28% and ending it at 26%.
For reference, the year's highest daily chance of a wet day is 38% on May 25, and its lowest chance is 23% on March 5.
Probability of Precipitation in August
The average sliding 31-day rainfall during August in Sainte-Hélène-sur-Isère is gradually increasing, starting the month at 2.3 inches, when it rarely exceeds 4.0 inches or falls below 0.7 inches, and ending the month at 2.5 inches, when it rarely exceeds 4.3 inches or falls below 0.8 inches.
The lowest average 31-day accumulation is 2.3 inches on August 8.
Average Monthly Rainfall in August
Over the course of August in Sainte-Hélène-sur-Isère, 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, 25 minutes, implying an average daily decrease of 2 minutes, 50 seconds, and weekly decrease of 19 minutes, 49 seconds.
The shortest day of the month is August 31, with 13 hours, 20 minutes of daylight and the longest day is August 1, with 14 hours, 45 minutes of daylight.
Hours of Daylight and Twilight in August
The earliest sunrise of the month in Sainte-Hélène-sur-Isère is 6:18 AM on August 1 and the latest sunrise is 36 minutes later at 6:54 AM on August 31.
The latest sunset is 9:03 PM on August 1 and the earliest sunset is 49 minutes earlier at 8:14 PM on August 31.
Daylight saving time is observed in Sainte-Hélène-sur-Isère during 2018, but it neither starts nor ends during August, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:45 AM and sets 15 hours, 42 minutes later, at 9:27 PM, while on December 21, the shortest day of the year, it rises at 8:12 AM and sets 8 hours, 41 minutes later, at 4:53 PM.
Sunrise & Sunset with Twilight in August
The chance that a given day will be muggy in Sainte-Hélène-sur-Isère is essentially constant during August, remaining around 0% throughout.
For reference, on July 25, the muggiest day of the year, there are muggy conditions 1% 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 August
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Sainte-Hélène-sur-Isère is essentially constant during August, remaining around 3.6 miles per hour throughout.
For reference, on April 3, the windiest day of the year, the daily average wind speed is 4.1 miles per hour, while on August 12, the calmest day of the year, the daily average wind speed is 3.6 miles per hour.
The lowest daily average wind speed during August is 3.6 miles per hour on August 12.
Average Wind Speed in August
Wind Direction in August
The growing season in Sainte-Hélène-sur-Isère typically lasts for 7.0 months (213 days), from around April 6 to around November 5, rarely starting before March 16 or after April 26, and rarely ending before October 16 or after November 27.
The month of August in Sainte-Hélène-sur-Isère is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in August
The average accumulated growing degree days in Sainte-Hélène-sur-Isère are rapidly increasing during August, increasing by 509°F, from 1,393°F to 1,903°F, over the course of the month.
Growing Degree Days in August
The average daily incident shortwave solar energy in Sainte-Hélène-sur-Isère is decreasing during August, falling by 1.2 kWh, from 6.8 kWh to 5.6 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in August
For the purposes of this report, the geographical coordinates of Sainte-Hélène-sur-Isère are 45.613 deg latitude, 6.321 deg longitude, and 1,703 ft elevation.
The topography within 2 miles of Sainte-Hélène-sur-Isère contains large variations in elevation, with a maximum elevation change of 3,107 feet and an average elevation above sea level of 1,568 feet. Within 10 miles contains large variations in elevation (7,838 feet). Within 50 miles also contains extreme variations in elevation (15,115 feet).
The area within 2 miles of Sainte-Hélène-sur-Isère is covered by cropland (42%), trees (38%), and artificial surfaces (15%), within 10 miles by trees (60%) and grassland (15%), and within 50 miles by trees (37%) and grassland (21%).
This report illustrates the typical weather in Sainte-Hélène-sur-Isère 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 Sainte-Hélène-sur-Isère.
For each station, the records are corrected for the elevation difference between that station and Sainte-Hélène-sur-Isère 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 Sainte-Hélène-sur-Isère is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Sainte-Hélène-sur-Isère and a given station.
The stations contributing to this reconstruction are: Chambéry Airport (37%, 34 kilometers, west); Annecy-Meythet (44%, 39 kilometers, northwest); Aosta Airport (15%, 81 kilometers, east); and Château-Arnoux-Saint-Auban Airport (4.7%, 174 kilometers, south).
Time zones for aiports and weather stations are provided by AskGeo.com .