Average Weather in January in La Rochette France
Daily high temperatures increase by 2°F, from 39°F to 41°F, rarely falling below 32°F or exceeding 48°F. The lowest daily average high temperature is 39°F on January 9.
Daily low temperatures are around 27°F, rarely falling below 18°F or exceeding 36°F. The lowest daily average low temperature is 26°F on January 12.
For reference, on August 4, the hottest day of the year, temperatures in La Rochette typically range from 57°F to 78°F, while on January 12, the coldest day of the year, they range from 26°F to 39°F.
Average High and Low Temperature in January
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on January. 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 January
The month of January in La Rochette experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 54% throughout the month.
The clearest day of the month is January 30, with clear, mostly clear, or partly cloudy conditions 47% of the time.
For reference, on May 8, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on July 22, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 69%.
Cloud Cover Categories in January
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In La Rochette, the chance of a wet day over the course of January is essentially constant, remaining around 28% throughout.
For reference, the year's highest daily chance of a wet day is 37% on May 25, and its lowest chance is 22% on March 5.
Over the course of January in La Rochette, the chance of a day with only rain remains an essentially constant 20% throughout, the chance of a day with mixed snow and rain remains an essentially constant 6% throughout, and the chance of a day with only snow remains an essentially constant 2% throughout.
Probability of Precipitation in January
The average sliding 31-day rainfall during January in La Rochette is essentially constant, remaining about 2.4 inches throughout, and rarely exceeding 4.9 inches or falling below 0.4 inches.
Average Monthly Rainfall in January
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. As with rainfall, we consider the liquid-equivalent snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day liquid-equivalent snowfall during January in La Rochette is essentially constant, remaining about 0.3 inches throughout, and rarely exceeding 0.8 inches or falling to 0.0 inches.
The highest average 31-day liquid-equivalent accumulation is 0.3 inches on January 2.
Average Monthly Liquid-Equivalent Snowfall in January
Over the course of January in La Rochette, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 55 minutes, implying an average daily increase of 1 minute, 51 seconds, and weekly increase of 12 minutes, 55 seconds.
The shortest day of the month is January 1, with 8 hours, 47 minutes of daylight and the longest day is January 31, with 9 hours, 43 minutes of daylight.
Hours of Daylight and Twilight in January
The latest sunrise of the month in La Rochette is 8:15 AM on January 2 and the earliest sunrise is 18 minutes earlier at 7:57 AM on January 31.
The earliest sunset is 5:02 PM on January 1 and the latest sunset is 38 minutes later at 5:40 PM on January 31.
Daylight saving time is observed in La Rochette during 2018, but it neither starts nor ends during January, so the entire month is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:46 AM and sets 15 hours, 41 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, 42 minutes later, at 4:54 PM.
Sunrise & Sunset with Twilight in January
The chance that a given day will be muggy in La Rochette is essentially constant during January, remaining around 0% throughout.
For reference, on July 24, 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 January
The average hourly wind speed in La Rochette is essentially constant during January, remaining around 3.9 miles per hour throughout.
For reference, on April 8, 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.
Average Wind Speed in January
Wind Direction in January
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.
The month of January in La Rochette is reliably fully outside of the growing season.
Time Spent in Various Temperature Bands and the Growing Season in January
The average accumulated growing degree days in La Rochette are essentially constant during January, remaining around 0°F throughout.
Growing Degree Days in January
The average daily incident shortwave solar energy in La Rochette is gradually increasing during January, rising by 0.7 kWh, from 1.5 kWh to 2.2 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in January
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 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 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).
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.
Time zones for aiports and weather stations are provided by AskGeo.com .