Average Weather in December in Saint-Jean France
Daily high temperatures decrease by 2°F, from 49°F to 46°F, rarely falling below 35°F or exceeding 57°F.
Daily low temperatures are around 38°F, rarely falling below 26°F or exceeding 48°F.
For reference, on August 3, the hottest day of the year, temperatures in Saint-Jean typically range from 58°F to 77°F, while on February 8, the coldest day of the year, they range from 36°F to 47°F.
Average High and Low Temperature in December
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. 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 December
The month of December in Saint-Jean experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 66% to 72%.
The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 34% of the time.
For reference, on January 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 72%, while on July 23, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 67%.
Cloud Cover Categories in December
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 Saint-Jean, the chance of a wet day over the course of December is increasing, starting the month at 28% and ending it at 32%.
For reference, the year's highest daily chance of a wet day is 33% on December 29, and its lowest chance is 16% on August 24.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Saint-Jean is essentially constant, remaining about 2.2 inches throughout, and rarely exceeding 4.2 inches or falling below 0.6 inches.
Average Monthly Rainfall in December
Over the course of December in Saint-Jean, the length of the day is essentially constant. The shortest day of the month is December 21, with 8 hours, 29 minutes of daylight and the longest day is December 1, with 8 hours, 46 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Saint-Jean is 8:27 AM on December 1 and the latest sunrise is 21 minutes later at 8:48 AM on December 31.
The earliest sunset is 5:11 PM on December 11 and the latest sunset is 10 minutes later at 5:21 PM on December 31.
Daylight saving time is observed in Saint-Jean during 2020, but it neither starts nor ends during December, so the entire month is in standard time.
For reference, on June 20, the longest day of the year, the Sun rises at 6:05 AM and sets 15 hours, 56 minutes later, at 10:01 PM, while on December 21, the shortest day of the year, it rises at 8:45 AM and sets 8 hours, 29 minutes later, at 5:14 PM.
Sunrise & Sunset with Twilight in December
The chance that a given day will be muggy in Saint-Jean is essentially constant during December, remaining around 0% throughout.
For reference, on August 2, the muggiest day of the year, there are muggy conditions 6% 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 December
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Saint-Jean is gradually increasing during December, increasing from 10.6 miles per hour to 11.3 miles per hour over the course of the month.
For reference, on January 16, the windiest day of the year, the daily average wind speed is 11.3 miles per hour, while on August 4, the calmest day of the year, the daily average wind speed is 8.1 miles per hour.
Average Wind Speed in December
The hourly average wind direction in Saint-Jean throughout December is predominantly from the south, with a peak proportion of 35% on December 29.
Wind Direction in December
The growing season in Saint-Jean typically lasts for 7.5 months (229 days), from around March 31 to around November 15, rarely starting before March 1 or after April 21, and rarely ending before October 22 or after December 18.
The month of December in Saint-Jean is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season rapidly decreasing from 25% to 3% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in December
The average accumulated growing degree days in Saint-Jean are essentially constant during December, remaining within 9°F of 2,470°F throughout.
Growing Degree Days in December
The average daily incident shortwave solar energy in Saint-Jean is essentially constant during December, remaining within 0.1 kWh of 1.1 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 1.0 kWh on December 27.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Saint-Jean are 47.246 deg latitude, -0.384 deg longitude, and 217 ft elevation.
The topography within 2 miles of Saint-Jean contains only modest variations in elevation, with a maximum elevation change of 180 feet and an average elevation above sea level of 233 feet. Within 10 miles also contains only modest variations in elevation (374 feet). Within 50 miles contains only modest variations in elevation (1,096 feet).
The area within 2 miles of Saint-Jean is covered by cropland (96%), within 10 miles by cropland (76%) and trees (15%), and within 50 miles by cropland (61%) and grassland (20%).
This report illustrates the typical weather in Saint-Jean 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 6 weather stations near enough to contribute to our estimation of the temperature and dew point in Saint-Jean.
For each station, the records are corrected for the elevation difference between that station and Saint-Jean 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 Saint-Jean is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Saint-Jean and a given station.
The stations contributing to this reconstruction are: Angers-Avrillé (39%, 31 kilometers, northwest); Angers – Loire Airport (32%, 35 kilometers, north); Tours Val de Loire Airport (8%, 86 kilometers, east); Poitiers–Biard Airport (8%, 90 kilometers, southeast); La Roche-sur-Yon - Les Ajoncs (7%, 97 kilometers, southwest); and Niort-Souché (6%, 104 kilometers, south).
Time zones for aiports and weather stations are provided by AskGeo.com .