Average Weather in July at La Roche-sur-Yon - Les Ajoncs France
Daily high temperatures increase by 3°F, from 73°F to 76°F, rarely falling below 65°F or exceeding 87°F.
Daily low temperatures are around 57°F, rarely falling below 50°F or exceeding 63°F.
For reference, on August 4, the hottest day of the year, temperatures at La Roche-sur-Yon - Les Ajoncs typically range from 57°F to 76°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 July
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on July. 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 July
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The month of July at La Roche-sur-Yon - Les Ajoncs experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 36% to 32%. The lowest chance of overcast or mostly cloudy conditions is 31% on July 24.
The clearest day of the month is July 24, with clear, mostly clear, or partly cloudy conditions 69% of the time.
For reference, on January 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 67%, while on July 24, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 69%.
Cloud Cover Categories in July
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. At La Roche-sur-Yon - Les Ajoncs, the chance of a wet day over the course of July is gradually decreasing, starting the month at 18% and ending it at 16%.
For reference, the year's highest daily chance of a wet day is 35% on December 29, and its lowest chance is 15% on August 23.
Probability of Precipitation in July
To 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 July at La Roche-sur-Yon - Les Ajoncs is essentially constant, remaining about 1.2 inches throughout, and rarely exceeding 2.2 inches or falling below 0.2 inches.
Average Monthly Rainfall in July
Over the course of July at La Roche-sur-Yon - Les Ajoncs, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 52 minutes, implying an average daily decrease of 1 minute, 45 seconds, and weekly decrease of 12 minutes, 14 seconds.
The shortest day of the month is July 31, with 14 hours, 55 minutes of daylight and the longest day is July 1, with 15 hours, 47 minutes of daylight.
Hours of Daylight and Twilight in July
The earliest sunrise of the month at La Roche-sur-Yon - Les Ajoncs is 6:15 AM on July 1 and the latest sunrise is 29 minutes later at 6:44 AM on July 31.
The latest sunset is 10:02 PM on July 1 and the earliest sunset is 24 minutes earlier at 9:39 PM on July 31.
Daylight saving time is observed at La Roche-sur-Yon - Les Ajoncs during 2019, but it neither starts nor ends during July, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 6:11 AM and sets 15 hours, 51 minutes later, at 10:02 PM, while on December 22, the shortest day of the year, it rises at 8:47 AM and sets 8 hours, 33 minutes later, at 5:20 PM.
Sunrise & Sunset with Twilight in July
We 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 at La Roche-sur-Yon - Les Ajoncs is gradually increasing during July, rising from 4% to 7% over the course of the month.
For reference, on August 3, the muggiest day of the year, there are muggy conditions 7% of the time, while on November 2, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in July
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
This 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 at La Roche-sur-Yon - Les Ajoncs is gradually decreasing during July, decreasing from 9.5 miles per hour to 8.8 miles per hour over the course of the month.
For reference, on December 22, the windiest day of the year, the daily average wind speed is 12.2 miles per hour, while on August 4, the calmest day of the year, the daily average wind speed is 8.6 miles per hour.
Average Wind Speed in July
Wind Direction in July
La Roche-sur-Yon - Les Ajoncs is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average surface water temperature at La Roche-sur-Yon - Les Ajoncs is gradually increasing during July, rising by 2°F, from 64°F to 67°F, over the course of the month.
Average Water Temperature in July
Definitions 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 at La Roche-sur-Yon - Les Ajoncs typically lasts for 7.9 months (242 days), from around March 27 to around November 24, rarely starting before February 23 or after April 19, and rarely ending before November 2 or after December 28.
The month of July at La Roche-sur-Yon - Les Ajoncs is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in July
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
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 at La Roche-sur-Yon - Les Ajoncs are rapidly increasing during July, increasing by 482°F, from 802°F to 1,284°F, over the course of the month.
Growing Degree Days in July
This 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 at La Roche-sur-Yon - Les Ajoncs is essentially constant during July, remaining within 0.2 kWh of 6.8 kWh throughout.
The highest average daily incident shortwave solar energy during July is 7.1 kWh on July 8.
Average Daily Incident Shortwave Solar Energy in July
For the purposes of this report, the geographical coordinates of La Roche-sur-Yon - Les Ajoncs are 46.702 deg latitude, -1.379 deg longitude, and 259 ft elevation.
The topography within 2 miles of La Roche-sur-Yon - Les Ajoncs contains only modest variations in elevation, with a maximum elevation change of 249 feet and an average elevation above sea level of 252 feet. Within 10 miles also contains only modest variations in elevation (328 feet). Within 50 miles contains only modest variations in elevation (1,207 feet).
The area within 2 miles of La Roche-sur-Yon - Les Ajoncs is covered by cropland (55%) and grassland (25%), within 10 miles by cropland (66%) and grassland (22%), and within 50 miles by cropland (48%) and water (27%).
This report illustrates the typical weather at La Roche-sur-Yon - Les Ajoncs 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
La Roche-sur-Yon - Les Ajoncs has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.
In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.
The stations on which we may fall back include but are not limited to Nantes Atlantique Airport, La Rochelle – Île de Ré Airport, Saint-Nazaire - Montoir, Niort-Souché, Angers-Avrillé, Angers – Loire Airport, Cognac-Châteaubernard Air Base, and Vannes-Meucon Airport.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The 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.