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Climate and Average Weather Year Round at La Roche-sur-Yon - Les Ajoncs France

At La Roche-sur-Yon - Les Ajoncs, the summers are comfortable; the winters are long, very cold, and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 36°F to 76°F and is rarely below 26°F or above 87°F.

Based on the tourism score, the best time of year to visit La Roche-sur-Yon - Les Ajoncs for warm-weather activities is from mid June to mid September.

Climate at La Roche-sur-Yon - Les Ajoncs

coldcoolcomfortablewarmcomfortablecoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow69%69%33%33%clearovercastprecipitation: 2.7 inprecipitation: 2.7 in1.1 in1.1 inmuggy: 7%muggy: 7%0%0%drydrytourism score: 7.5tourism score: 7.50.40.4
La Roche-sur-Yon - Les Ajoncs weather by month. Click on each chart for more information.

The warm season lasts for 3.2 months, from June 10 to September 16, with an average daily high temperature above 70°F. The hottest month of the year at La Roche-sur-Yon - Les Ajoncs is July, with an average high of 75°F and low of 57°F.

The cool season lasts for 3.7 months, from November 17 to March 9, with an average daily high temperature below 53°F. The coldest month of the year at La Roche-sur-Yon - Les Ajoncs is January, with an average low of 37°F and high of 47°F.

Average High and Low Temperature at La Roche-sur-Yon - Les Ajoncs

Average High and Low Temperature at La Roche-sur-Yon - Les AjoncswarmcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FFeb 848°FFeb 848°FAug 376°FAug 376°F36°F36°F57°F57°FJun 1070°FJun 1070°FSep 1670°FSep 1670°FNov 1753°FNov 1753°FMar 953°FMar 953°F53°F53°F53°F53°F42°F42°F39°F39°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 47°F49°F54°F59°F65°F71°F75°F75°F70°F62°F53°F48°F
Temp. 42°F43°F47°F51°F57°F63°F66°F66°F62°F55°F48°F43°F
Low 37°F37°F40°F43°F49°F54°F57°F56°F53°F48°F42°F38°F

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature at La Roche-sur-Yon - Les Ajoncs

Average Hourly Temperature at La Roche-sur-Yon - Les AjoncsJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNowNowvery coldvery coldvery coldvery coldcoldcoldcoolcomfortablewarm
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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Seattle, Washington, United States (5,019 miles away) is the far-away foreign place with temperatures most similar to La Roche-sur-Yon - Les Ajoncs (view comparison).

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At La Roche-sur-Yon - Les Ajoncs, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year at La Roche-sur-Yon - Les Ajoncs begins around May 23 and lasts for 4.5 months, ending around October 7.

The clearest month of the year at La Roche-sur-Yon - Les Ajoncs is July, during which on average the sky is clear, mostly clear, or partly cloudy 68% of the time.

The cloudier part of the year begins around October 7 and lasts for 7.5 months, ending around May 23.

The cloudiest month of the year at La Roche-sur-Yon - Les Ajoncs is January, during which on average the sky is overcast or mostly cloudy 64% of the time.

Cloud Cover Categories at La Roche-sur-Yon - Les Ajoncs

Cloud Cover Categories at La Roche-sur-Yon - Les AjoncsclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jul 2369%Jul 2369%Jan 333%Jan 333%May 2351%May 2351%Oct 751%Oct 751%NowNowclearmostly clearpartly cloudyovercastmostly cloudy
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier 64%59%55%51%50%42%32%35%43%52%59%64%
Clearer 36%41%45%49%50%58%68%65%57%48%41%36%

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at La Roche-sur-Yon - Les Ajoncs varies throughout the year.

The wetter season lasts 8.0 months, from September 24 to May 22, with a greater than 25% chance of a given day being a wet day. The month with the most wet days at La Roche-sur-Yon - Les Ajoncs is November, with an average of 9.9 days with at least 0.04 inches of precipitation.

The drier season lasts 4.0 months, from May 22 to September 24. The month with the fewest wet days at La Roche-sur-Yon - Les Ajoncs is August, with an average of 4.9 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone at La Roche-sur-Yon - Les Ajoncs is November, with an average of 9.9 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 35% on November 3.

Daily Chance of Precipitation at La Roche-sur-Yon - Les Ajoncs

Daily Chance of Precipitation at La Roche-sur-Yon - Les AjoncswetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Dec 2735%Dec 2735%Aug 2215%Aug 2215%Sep 2425%Sep 2425%May 2225%May 2225%NowNowrain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain 9.6d7.4d7.2d7.8d8.0d6.1d5.2d4.9d6.5d9.8d9.9d10.0d
Mixed 0.2d0.2d0.1d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.1d
Snow 0.1d0.1d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d
Any 9.9d7.7d7.3d7.8d8.0d6.1d5.2d4.9d6.5d9.8d9.9d10.2d

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. La Roche-sur-Yon - Les Ajoncs experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year at La Roche-sur-Yon - Les Ajoncs. The month with the most rain at La Roche-sur-Yon - Les Ajoncs is October, with an average rainfall of 2.6 inches.

The month with the least rain at La Roche-sur-Yon - Les Ajoncs is August, with an average rainfall of 1.1 inches.

Average Monthly Rainfall at La Roche-sur-Yon - Les Ajoncs

Average Monthly Rainfall at La Roche-sur-Yon - Les AjoncsJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 inOct 292.7 inOct 292.7 inAug 131.1 inAug 131.1 inDec 272.6 inDec 272.6 inApr 291.8 inApr 291.8 inMar 131.5 inMar 131.5 inNowNow
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 2.4″1.9″1.6″1.7″1.7″1.3″1.2″1.1″1.8″2.6″2.5″2.5″

The length of the day at La Roche-sur-Yon - Les Ajoncs varies significantly over the course of the year. In 2024, the shortest day is December 21, with 8 hours, 33 minutes of daylight; the longest day is June 20, with 15 hours, 51 minutes of daylight.

Hours of Daylight and Twilight at La Roche-sur-Yon - Les Ajoncs

Hours of Daylight and Twilight at La Roche-sur-Yon - Les AjoncsJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 2012 hr, 8 minMar 2015 hr, 51 minJun 2015 hr, 51 minJun 2012 hr, 10 minSep 2212 hr, 10 minSep 228 hr, 33 minDec 218 hr, 33 minDec 21nightnightdayNowNow
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 9.0h10.3h12.0h13.6h15.1h15.8h15.4h14.1h12.5h10.9h9.4h8.6h

The earliest sunrise is at 6:11 AM on June 15, and the latest sunrise is 2 hours, 39 minutes later at 8:50 AM on January 2. The earliest sunset is at 5:17 PM on December 10, and the latest sunset is 4 hours, 46 minutes later at 10:03 PM on June 25.

Daylight saving time (DST) is observed at La Roche-sur-Yon - Les Ajoncs during 2024, starting in the spring on March 31, lasting 6.9 months, and ending in the fall on October 27.

Sunrise & Sunset with Twilight and Daylight Saving Time at La Roche-sur-Yon - Les Ajoncs

Sunrise & Sunset with Twilight and Daylight Saving Time at La Roche-sur-Yon - Les AjoncsJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM2 AMJun 156:11 AMJun 156:11 AM10:03 PMJun 2510:03 PMJun 25Dec 105:17 PMDec 105:17 PM8:50 AMJan 28:50 AMJan 2Mar 31DSTMar 31DSTDSTOct 27DSTOct 27daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2024. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth at La Roche-sur-Yon - Les Ajoncs

Solar Elevation and Azimuth at La Roche-sur-Yon - Les AjoncsJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AM000010101020203030304040506000010101010202020303040405050602067NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

Moon Rise, Set & Phases at La Roche-sur-Yon - Les Ajoncs

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

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 perceived humidity level at La Roche-sur-Yon - Les Ajoncs, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, staying within 4% of 4% throughout.

Humidity Comfort Levels at La Roche-sur-Yon - Les Ajoncs

Humidity Comfort Levels at La Roche-sur-Yon - Les AjoncsJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 270%Feb 270%Aug 27%Aug 27%NowNowhumidhumidcomfortablecomfortabledrydry
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days 0.0d0.0d0.0d0.0d0.1d0.7d1.7d2.0d0.8d0.1d0.0d0.0d

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 experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 6.6 months, from October 7 to April 25, with average wind speeds of more than 10.4 miles per hour. The windiest month of the year at La Roche-sur-Yon - Les Ajoncs is January, with an average hourly wind speed of 12.0 miles per hour.

The calmer time of year lasts for 5.4 months, from April 25 to October 7. The calmest month of the year at La Roche-sur-Yon - Les Ajoncs is August, with an average hourly wind speed of 8.9 miles per hour.

Average Wind Speed at La Roche-sur-Yon - Les Ajoncs

Average Wind Speed at La Roche-sur-Yon - Les AjoncswindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mph20 mph20 mphDec 2112.2 mphDec 2112.2 mphAug 38.6 mphAug 38.6 mphOct 710.4 mphOct 710.4 mphApr 2510.4 mphApr 2510.4 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph) 12.011.611.210.89.99.59.18.99.610.711.412.0

The predominant average hourly wind direction at La Roche-sur-Yon - Les Ajoncs varies throughout the year.

The wind is most often from the west for 8.9 months, from January 13 to October 10 and for 1.4 months, from November 10 to December 23, with a peak percentage of 47% on July 10. The wind is most often from the south for 1.0 months, from October 10 to November 10 and for 3.0 weeks, from December 23 to January 13, with a peak percentage of 31% on October 28.

Wind Direction at La Roche-sur-Yon - Les Ajoncs

Wind Direction at La Roche-sur-Yon - Les AjoncsSWSWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

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 water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.2 months, from June 22 to September 30, with an average temperature above 63°F. The month of the year at La Roche-sur-Yon - Les Ajoncs with the warmest water is August, with an average temperature of 67°F.

The time of year with cooler water lasts for 3.8 months, from December 19 to April 11, with an average temperature below 53°F. The month of the year at La Roche-sur-Yon - Les Ajoncs with the coolest water is February, with an average temperature of 49°F.

Average Water Temperature at La Roche-sur-Yon - Les Ajoncs

Average Water Temperature at La Roche-sur-Yon - Les AjoncswarmcoolJanFebMarAprMayJunJulAugSepOctNovDec45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°FAug 767°FAug 767°F49°FFeb 2049°FFeb 20Jun 2263°FJun 2263°FSep 3063°FSep 3063°FDec 1953°FDec 1953°FApr 1153°FApr 1153°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 51°F49°F50°F53°F58°F63°F66°F67°F65°F62°F57°F53°F

To characterize how pleasant the weather is at La Roche-sur-Yon - Les Ajoncs throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit La Roche-sur-Yon - Les Ajoncs for general outdoor tourist activities is from mid June to mid September, with a peak score in the last week of July.

Tourism Score at La Roche-sur-Yon - Les Ajoncs

Tourism Score at La Roche-sur-Yon - Les Ajoncsbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.57.50.40.4NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationtourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit La Roche-sur-Yon - Les Ajoncs for hot-weather activities is from mid July to mid August, with a peak score in the first week of August.

Beach/Pool Score at La Roche-sur-Yon - Les Ajoncs

Beach/Pool Score at La Roche-sur-Yon - Les AjoncsJanFebMarAprMayJunJulAugSepOctNovDec002244668810104.94.90.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationbeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

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 26 to around November 23, rarely starting before February 23 or after April 18, and rarely ending before November 1 or after December 27.

Time Spent in Various Temperature Bands and the Growing Season at La Roche-sur-Yon - Les Ajoncs

Time Spent in Various Temperature Bands and the Growing Season at La Roche-sur-Yon - Les Ajoncsgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Mar 2650%Mar 2650%Nov 2350%Nov 2390%Apr 1890%Apr 1890%Nov 190%Nov 110%Feb 2310%Feb 2310%Dec 2710%Dec 270%Jan 160%Jan 16Jul 22100%Jul 22100%very coldcoldcoolcomfortablewarm
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 percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

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.

Based on growing degree days alone, the first spring blooms at La Roche-sur-Yon - Les Ajoncs should appear around April 5, only rarely appearing before March 18 or after April 27.

Growing Degree Days at La Roche-sur-Yon - Les Ajoncs

Growing Degree Days at La Roche-sur-Yon - Les AjoncsJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°FApr 589°FApr 589°FJul 6900°FJul 6900°FAug 311,800°FAug 311,800°FDec 312,434°FDec 312,434°F
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

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 experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.3 months, from May 9 to August 20, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest month of the year at La Roche-sur-Yon - Les Ajoncs is July, with an average of 6.9 kWh.

The darker period of the year lasts for 3.6 months, from October 27 to February 17, with an average daily incident shortwave energy per square meter below 2.3 kWh. The darkest month of the year at La Roche-sur-Yon - Les Ajoncs is December, with an average of 1.1 kWh.

Average Daily Incident Shortwave Solar Energy at La Roche-sur-Yon - Les Ajoncs

Average Daily Incident Shortwave Solar Energy at La Roche-sur-Yon - Les AjoncsbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJul 67.1 kWhJul 67.1 kWhDec 261.1 kWhDec 261.1 kWhMay 95.9 kWhMay 95.9 kWhAug 205.9 kWhAug 205.9 kWhOct 272.3 kWhOct 272.3 kWhFeb 172.3 kWhFeb 172.3 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 1.32.23.65.06.16.96.96.04.42.81.61.1

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 295 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, 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.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

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.

Please review our full terms contained on our Terms of Service page.