Average Weather in La Rochette France
In La Rochette, the summers are warm, the winters are very cold and wet, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 26°F to 78°F and is rarely below 18°F or above 87°F.
Based on the tourism score, the best time of year to visit La Rochette for warm-weather activities is from late June to early September.
The warm season lasts for 3.2 months, from June 5 to September 11, with an average daily high temperature above 70°F. The hottest day of the year is August 4, with an average high of 78°F and low of 57°F.
The cold season lasts for 3.5 months, from November 19 to March 2, with an average daily high temperature below 47°F. The coldest day of the year is January 12, with an average low of 26°F and high of 39°F.
Average High and Low Temperature
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
In La Rochette, 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 in La Rochette begins around June 19 and lasts for 2.9 months, ending around September 17. On July 22, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 69% of the time, and overcast or mostly cloudy 31% of the time.
The cloudier part of the year begins around September 17 and lasts for 9.1 months, ending around June 19. On May 8, the cloudiest day of the year, the sky is overcast or mostly cloudy 58% of the time, and clear, mostly clear, or partly cloudy 42% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in La Rochette varies throughout the year.
The wetter season lasts 6.9 months, from April 4 to November 1, with a greater than 30% chance of a given day being a wet day. The chance of a wet day peaks at 37% on May 25.
The drier season lasts 5.1 months, from November 1 to April 4. The smallest chance of a wet day is 22% on March 5.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 37% on May 25.
Daily Chance of Precipitation
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 Rochette experiences some seasonal variation in monthly rainfall.
Rain falls throughout the year in La Rochette. The most rain falls during the 31 days centered around October 12, with an average total accumulation of 3.1 inches.
The least rain falls around August 6, with an average total accumulation of 2.1 inches.
Average Monthly Rainfall
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. La Rochette experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 3.3 months, from November 19 to February 28, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 2, with an average total liquid-equivalent accumulation of 0.3 inches.
The snowless period of the year lasts for 8.7 months, from February 28 to November 19. The least snow falls around July 31, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in La Rochette varies significantly over the course of the year. In 2018, the shortest day is December 21, with 8 hours, 42 minutes of daylight; the longest day is June 21, with 15 hours, 41 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:46 AM on June 15, and the latest sunrise is 2 hours, 29 minutes later at 8:15 AM on January 2. The earliest sunset is at 4:52 PM on December 11, and the latest sunset is 4 hours, 36 minutes later at 9:28 PM on June 26.
Daylight saving time (DST) is observed in La Rochette during 2018, starting in the spring on March 25, lasting 7.1 months, and ending in the fall on October 28.
Sunrise & Sunset with Twilight and Daylight Saving Time
The perceived humidity level in La Rochette, 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 1% of 1% throughout.
Humidity Comfort Levels
Average Wind Speed
The predominant average hourly wind direction in La Rochette varies throughout the year.
The wind is most often from the east for 1.1 months, from January 11 to February 15 and for 1.1 weeks, from February 24 to March 4, with a peak percentage of 38% on January 20. The wind is most often from the south for 1.3 weeks, from February 15 to February 24; for 1.3 weeks, from March 4 to March 13; and for 3.8 months, from September 18 to January 11, with a peak percentage of 32% on February 16. The wind is most often from the north for 6.2 months, from March 13 to September 18, with a peak percentage of 36% on July 26.
Best Time of Year to Visit
To characterize how pleasant the weather is in La Rochette 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 Rochette for general outdoor tourist activities is from late June to early September, with a peak score in the first week of August.
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 Rochette for hot-weather activities is from early July to mid August, with a peak score in the last week of July.
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.
The growing season in La Rochette typically lasts for 6.8 months (208 days), from around April 10 to around November 3, rarely starting before March 23 or after April 28, and rarely ending before October 14 or after November 24.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in La Rochette should appear around April 22, only rarely appearing before April 9 or after May 5.
Growing Degree Days
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 3.2 months, from May 12 to August 18, with an average daily incident shortwave energy per square meter above 6.1 kWh. The brightest day of the year is July 6, with an average of 7.3 kWh.
The darker period of the year lasts for 3.4 months, from October 28 to February 10, with an average daily incident shortwave energy per square meter below 2.6 kWh. The darkest day of the year is December 23, with an average of 1.5 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of La Rochette are 45.460 deg latitude, 6.121 deg longitude, and 1,791 ft elevation.
The topography within 2 miles of La Rochette contains very significant variations in elevation, with a maximum elevation change of 1,929 feet and an average elevation above sea level of 1,744 feet. Within 10 miles contains very significant variations in elevation (8,238 feet). Within 50 miles also contains extreme variations in elevation (15,174 feet).
The area within 2 miles of La Rochette is covered by trees (52%), cropland (28%), and grassland (14%), within 10 miles by trees (57%) and cropland (20%), and within 50 miles by trees (38%) and grassland (20%).
This report illustrates the typical weather in La Rochette, 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in La Rochette.
For each station, the records are corrected for the elevation difference between that station and La Rochette 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 La Rochette is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between La Rochette and a given station.
The stations contributing to this reconstruction are: Chambéry Airport (71%, 27 kilometers, northwest); Aosta Airport (19%, 100 kilometers, east); and Château-Arnoux-Saint-Auban Airport (10%, 155 kilometers, south).
Time zones for aiports and weather stations are provided by AskGeo.com .