Average Weather in Saint-Julien-en-Genevois France
In Saint-Julien-en-Genevois, the summers are warm, the winters are chilly and wet, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 29°F to 79°F and is rarely below 21°F or above 88°F.
The warm season lasts for 3.2 months, from June 5 to September 10, with an average daily high temperature above 71°F. The hottest day of the year is August 4, with an average high of 79°F and low of 58°F.
The cold season lasts for 3.6 months, from November 16 to March 3, with an average daily high temperature below 48°F. The coldest day of the year is January 27, with an average low of 29°F and high of 40°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 Saint-Julien-en-Genevois, 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 Saint-Julien-en-Genevois begins around June 16 and lasts for 3.1 months, ending around September 19. On July 21, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 68% of the time, and overcast or mostly cloudy 32% of the time.
The cloudier part of the year begins around September 19 and lasts for 8.9 months, ending around June 16. On December 31, the cloudiest day of the year, the sky is overcast or mostly cloudy 59% of the time, and clear, mostly clear, or partly cloudy 41% of the time.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Saint-Julien-en-Genevois varies throughout the year.
The wetter season lasts 7.9 months, from April 29 to December 25, with a greater than 33% chance of a given day being a wet day. The chance of a wet day peaks at 40% on May 25.
The drier season lasts 4.1 months, from December 25 to April 29. The smallest chance of a wet day is 26% on March 3.
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 40% 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. Saint-Julien-en-Genevois experiences some seasonal variation in monthly rainfall.
Rain falls throughout the year in Saint-Julien-en-Genevois. The most rain falls during the 31 days centered around October 23, with an average total accumulation of 3.6 inches.
The least rain falls around March 9, with and average total accumulation of 2.6 inches.
Average Monthly Rainfall
The sliding 31-day liquid-equivalent quantity of snowfall in Saint-Julien-en-Genevois does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Saint-Julien-en-Genevois varies significantly over the course of the year. In 2017, the shortest day is December 21, with 8 hours, 37 minutes of daylight; the longest day is June 21, with 15 hours, 47 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:43 AM on June 16, and the latest sunrise is 2 hours, 35 minutes later at 8:18 AM on January 1. The earliest sunset is at 4:49 PM on December 10, and the latest sunset is 4 hours, 41 minutes later at 9:31 PM on June 25.
Daylight saving time (DST) is observed in Saint-Julien-en-Genevois during 2017, starting in the spring on March 26, lasting 7.1 months, and ending in the fall on October 29.
Sunrise & Sunset with Twilight and Daylight Saving Time
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 in Saint-Julien-en-Genevois, 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, remaining a virtually constant 0% throughout.
Humidity Comfort Levels
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 in Saint-Julien-en-Genevois does not vary significantly over the course of the year, remaining within 0.3 miles per hour of 3.2 miles per hour throughout.
Average Wind Speed
The predominant average hourly wind direction in Saint-Julien-en-Genevois varies throughout the year.
The wind is most often from the north for 1.5 months, from March 31 to May 14; for 2.4 weeks, from July 19 to August 5; and for 4.3 weeks, from August 17 to September 16, with a peak percentage of 36% on April 19. The wind is most often from the west for 2.2 months, from May 14 to July 19 and for 1.7 weeks, from August 5 to August 17, with a peak percentage of 36% on July 5. The wind is most often from the south for 6.5 months, from September 16 to March 31, with a peak percentage of 49% on December 29.
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 3.2 months, from May 13 to August 19, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest day of the year is July 6, with an average of 7.1 kWh.
The darker period of the year lasts for 3.5 months, from October 27 to February 14, with an average daily incident shortwave energy per square meter below 2.5 kWh. The darkest day of the year is December 24, with an average of 1.3 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Saint-Julien-en-Genevois are 46.144 deg latitude, 6.083 deg longitude, and 1,522 ft elevation.
The topography within 2 miles of Saint-Julien-en-Genevois contains significant variations in elevation, with a maximum elevation change of 535 feet and an average elevation above sea level of 1,530 feet. Within 10 miles contains significant variations in elevation (3,934 feet). Within 50 miles also contains extreme variations in elevation (15,112 feet).
The area within 2 miles of Saint-Julien-en-Genevois is covered by cropland (63%) and artificial surfaces (32%), within 10 miles by cropland (40%) and trees (26%), and within 50 miles by trees (42%) and cropland (22%).
This report illustrates the typical weather in Saint-Julien-en-Genevois, 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 Saint-Julien-en-Genevois.
For each station, the records are corrected for the elevation difference between that station and Saint-Julien-en-Genevois 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-Julien-en-Genevois is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Saint-Julien-en-Genevois and a given station.
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.