Climate and Average Weather Year Round in Île de Noirmoutier France

In Île de Noirmoutier, the summers are comfortable and dry; the winters are long, cold, and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 41°F to 72°F and is rarely below 33°F or above 82°F.

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

The warm season lasts for 3.2 months, from June 13 to September 18, with an average daily high temperature above 67°F. The hottest month of the year in Île de Noirmoutier is August, with an average high of 71°F and low of 60°F.

The cool season lasts for 4.0 months, from November 22 to March 20, with an average daily high temperature below 54°F. The coldest month of the year in Île de Noirmoutier is February, with an average low of 42°F and high of 50°F.

In Île de Noirmoutier, 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 Île de Noirmoutier begins around May 22 and lasts for 4.5 months, ending around October 7.

The clearest month of the year in Île de Noirmoutier is July, during which on average the sky is clear, mostly clear, or partly cloudy 64% of the time.

The cloudier part of the year begins around October 7 and lasts for 7.5 months, ending around May 22.

The cloudiest month of the year in Île de Noirmoutier is January, during which on average the sky is overcast or mostly cloudy 63% 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 Île de Noirmoutier varies throughout the year.

The wetter season lasts 7.6 months, from September 21 to May 10, with a greater than 25% chance of a given day being a wet day. The month with the most wet days in Île de Noirmoutier is December, with an average of 10.2 days with at least 0.04 inches of precipitation.

The drier season lasts 4.4 months, from May 10 to September 21. The month with the fewest wet days in Île de Noirmoutier is August, with an average of 4.7 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 Île de Noirmoutier is December, with an average of 10.2 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 35% on December 29.

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. Île de Noirmoutier experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year in Île de Noirmoutier. The month with the most rain in Île de Noirmoutier is October, with an average rainfall of 2.5 inches.

The month with the least rain in Île de Noirmoutier is August, with an average rainfall of 1.0 inches.

The length of the day in Île de Noirmoutier varies significantly over the course of the year. In 2024, the shortest day is December 21, with 8 hours, 31 minutes of daylight; the longest day is June 20, with 15 hours, 54 minutes of daylight.

The earliest sunrise is at 6:13 AM on June 15, and the latest sunrise is 2 hours, 41 minutes later at 8:54 AM on January 2. The earliest sunset is at 5:19 PM on December 10, and the latest sunset is 4 hours, 48 minutes later at 10:08 PM on June 25.

Daylight saving time (DST) is observed in Île de Noirmoutier 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.

Île de Noirmoutier experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.0 months, from June 25 to September 23, during which time the comfort level is muggy, oppressive, or miserable at least 3% of the time. The month with the most muggy days in Île de Noirmoutier is August, with 3.0 days that are muggy or worse.

The least muggy day of the year is February 29, when muggy conditions are essentially unheard of.

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 Île de Noirmoutier experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 6.2 months, from October 9 to April 15, with average wind speeds of more than 12.8 miles per hour. The windiest month of the year in Île de Noirmoutier is December, with an average hourly wind speed of 15.3 miles per hour.

The calmer time of year lasts for 5.8 months, from April 15 to October 9. The calmest month of the year in Île de Noirmoutier is August, with an average hourly wind speed of 10.6 miles per hour.

The predominant average hourly wind direction in Île de Noirmoutier is from the west throughout the year.

Île de Noirmoutier is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.3 months, from June 21 to September 30, with an average temperature above 62°F. The month of the year in Île de Noirmoutier with the warmest water is August, with an average temperature of 65°F.

The time of year with cooler water lasts for 3.7 months, from December 19 to April 10, with an average temperature below 52°F. The month of the year in Île de Noirmoutier with the coolest water is February, with an average temperature of 49°F.

To characterize how pleasant the weather is in Île de Noirmoutier 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 Île de Noirmoutier for general outdoor tourist activities is from late June to mid September, with a peak score in the last 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 Île de Noirmoutier for hot-weather activities is from mid July to mid August, with a peak score in the first week of August.

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 Île de Noirmoutier typically lasts for 11 months (325 days), from around February 6 to around December 27, rarely starting after March 3, or ending before November 17.

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 Île de Noirmoutier should appear around March 28, only rarely appearing before March 5 or after April 21.

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 3.3 months, from May 9 to August 19, with an average daily incident shortwave energy per square meter above 5.8 kWh. The brightest month of the year in Île de Noirmoutier is June, with an average of 6.9 kWh.

The darker period of the year lasts for 3.7 months, from October 27 to February 17, with an average daily incident shortwave energy per square meter below 2.2 kWh. The darkest month of the year in Île de Noirmoutier is December, with an average of 1.1 kWh.

For the purposes of this report, the geographical coordinates of Île de Noirmoutier are 46.992 deg latitude, -2.258 deg longitude, and 0 ft elevation.

The topography within 2 miles of Île de Noirmoutier is essentially flat, with a maximum elevation change of 0 feet and an average elevation above sea level of 0 feet. Within 10 miles is also essentially flat (0 feet). Within 50 miles is also essentially flat (0 feet).

The area within 2 miles of Île de Noirmoutier is covered by water (47%), artificial surfaces (26%), and cropland (15%), within 10 miles by water (92%), and within 50 miles by water (55%) and cropland (27%).