Climate and Average Weather Year Round in Diémoz France

In Diémoz, the summers are warm, the winters are very cold, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 31°F to 80°F and is rarely below 22°F or above 90°F.

Based on the tourism score, the best time of year to visit Diémoz for warm-weather activities is from mid June to mid September.

The warm season lasts for 3.0 months, from June 8 to September 8, with an average daily high temperature above 72°F. The hottest month of the year in Diémoz is July, with an average high of 79°F and low of 59°F.

The cold season lasts for 3.6 months, from November 16 to March 2, with an average daily high temperature below 49°F. The coldest month of the year in Diémoz is January, with an average low of 32°F and high of 42°F.

In Diémoz, 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 Diémoz begins around June 9 and lasts for 3.4 months, ending around September 23.

The clearest month of the year in Diémoz is July, during which on average the sky is clear, mostly clear, or partly cloudy 69% of the time.

The cloudier part of the year begins around September 23 and lasts for 8.6 months, ending around June 9.

The cloudiest month of the year in Diémoz is November, during which on average the sky is overcast or mostly cloudy 62% 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 Diémoz varies throughout the year.

The wetter season lasts 8.4 months, from March 31 to December 12, with a greater than 26% chance of a given day being a wet day. The month with the most wet days in Diémoz is May, with an average of 9.9 days with at least 0.04 inches of precipitation.

The drier season lasts 3.6 months, from December 12 to March 31. The month with the fewest wet days in Diémoz is August, with an average of 6.8 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 in Diémoz is May, 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 33% on May 23.

Rainfall

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. Diémoz experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year in Diémoz. The month with the most rain in Diémoz is October, with an average rainfall of 2.9 inches.

The month with the least rain in Diémoz is February, with an average rainfall of 1.5 inches.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Diémoz experiences some seasonal variation in monthly snowfall.

The snowy period of the year lasts for 1.3 months, from December 12 to January 22, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Diémoz is January, with an average snowfall of 1.1 inches.

The snowless period of the year lasts for 11 months, from January 22 to December 12. The least snow falls around August 7, with an average total accumulation of 0.0 inches.

The length of the day in Diémoz varies significantly over the course of the year. In 2024, the shortest day is December 21, with 8 hours, 42 minutes of daylight; the longest day is June 20, with 15 hours, 42 minutes of daylight.

The earliest sunrise is at 5:49 AM on June 15, and the latest sunrise is 2 hours, 30 minutes later at 8:20 AM on January 2. The earliest sunset is at 4:55 PM on December 10, and the latest sunset is 4 hours, 37 minutes later at 9:32 PM on June 26.

Daylight saving time (DST) is observed in Diémoz during 2024, starting in the spring on March 31, lasting 6.9 months, and ending in the fall on October 27.

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.

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 Diémoz, 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 2% of 2% throughout.

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 Diémoz experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 7.1 months, from October 14 to May 19, with average wind speeds of more than 7.4 miles per hour. The windiest month of the year in Diémoz is March, with an average hourly wind speed of 8.2 miles per hour.

The calmer time of year lasts for 4.9 months, from May 19 to October 14. The calmest month of the year in Diémoz is August, with an average hourly wind speed of 6.5 miles per hour.

The predominant average hourly wind direction in Diémoz varies throughout the year.

The wind is most often from the north for 8.8 months, from January 10 to October 3 and for 1.2 months, from November 11 to December 16, with a peak percentage of 59% on July 26. The wind is most often from the south for 1.3 months, from October 3 to November 11 and for 3.6 weeks, from December 16 to January 10, with a peak percentage of 46% on October 27.

To characterize how pleasant the weather is in Diémoz 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 Diémoz for general outdoor tourist activities is from mid June to mid September, with a peak score in the third week of July.

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 Diémoz for hot-weather activities is from early July to mid August, with a peak score in the third week of July.

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 in Diémoz typically lasts for 7.1 months (216 days), from around April 5 to around November 7, rarely starting before March 7 or after April 26, and rarely ending before October 16 or after December 4.

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 in Diémoz should appear around April 8, only rarely appearing before March 22 or after April 25.

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 18, with an average daily incident shortwave energy per square meter above 6.0 kWh. The brightest month of the year in Diémoz is July, with an average of 7.0 kWh.

The darker period of the year lasts for 3.6 months, from October 26 to February 15, with an average daily incident shortwave energy per square meter below 2.4 kWh. The darkest month of the year in Diémoz is December, with an average of 1.3 kWh.

For the purposes of this report, the geographical coordinates of Diémoz are 45.587 deg latitude, 5.094 deg longitude, and 1,289 ft elevation.

The topography within 2 miles of Diémoz contains significant variations in elevation, with a maximum elevation change of 594 feet and an average elevation above sea level of 1,153 feet. Within 10 miles contains significant variations in elevation (1,260 feet). Within 50 miles contains very significant variations in elevation (7,251 feet).

The area within 2 miles of Diémoz is covered by cropland (59%), trees (16%), artificial surfaces (12%), and grassland (12%), within 10 miles by cropland (59%) and trees (18%), and within 50 miles by cropland (37%) and trees (34%).