Climate and Average Weather Year Round in L'Île-Rousse France

In L'Île-Rousse, the summers are short, warm, humid, dry, and mostly clear and the winters are long, cold, windy, and partly cloudy. Over the course of the year, the temperature typically varies from 42°F to 84°F and is rarely below 36°F or above 90°F.

Based on the beach/pool score, the best time of year to visit L'Île-Rousse for hot-weather activities is from late June to late August.

The warm season lasts for 2.8 months, from June 18 to September 11, with an average daily high temperature above 79°F. The hottest month of the year in L'Île-Rousse is August, with an average high of 83°F and low of 67°F.

The cool season lasts for 4.2 months, from November 21 to March 28, with an average daily high temperature below 62°F. The coldest month of the year in L'Île-Rousse is January, with an average low of 43°F and high of 56°F.

In L'Île-Rousse, 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 L'Île-Rousse begins around June 13 and lasts for 3.0 months, ending around September 11.

The clearest month of the year in L'Île-Rousse is July, during which on average the sky is clear, mostly clear, or partly cloudy 85% of the time.

The cloudier part of the year begins around September 11 and lasts for 9.0 months, ending around June 13.

The cloudiest month of the year in L'Île-Rousse is November, during which on average the sky is overcast or mostly cloudy 47% 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 L'Île-Rousse varies throughout the year.

The wetter season lasts 7.7 months, from September 17 to May 8, with a greater than 18% chance of a given day being a wet day. The month with the most wet days in L'Île-Rousse is November, with an average of 8.8 days with at least 0.04 inches of precipitation.

The drier season lasts 4.3 months, from May 8 to September 17. The month with the fewest wet days in L'Île-Rousse is July, with an average of 1.7 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 L'Île-Rousse is November, with an average of 8.8 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 31% on November 17.

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. L'Île-Rousse experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in L'Île-Rousse. The month with the most rain in L'Île-Rousse is November, with an average rainfall of 3.0 inches.

The month with the least rain in L'Île-Rousse is July, with an average rainfall of 0.3 inches.

The length of the day in L'Île-Rousse varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 3 minutes of daylight; the longest day is June 20, with 15 hours, 19 minutes of daylight.

The earliest sunrise is at 5:45 AM on June 14, and the latest sunrise is 2 hours, 9 minutes later at 7:54 AM on January 3. The earliest sunset is at 4:50 PM on December 8, and the latest sunset is 4 hours, 16 minutes later at 9:06 PM on June 26.

Daylight saving time (DST) is observed in L'Île-Rousse 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.

L'Île-Rousse experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.4 months, from June 13 to September 26, during which time the comfort level is muggy, oppressive, or miserable at least 10% of the time. The month with the most muggy days in L'Île-Rousse is August, with 11.4 days that are muggy or worse.

The least muggy day of the year is February 26, 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 L'Île-Rousse experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 6.6 months, from October 6 to April 24, with average wind speeds of more than 9.4 miles per hour. The windiest month of the year in L'Île-Rousse is December, with an average hourly wind speed of 11.7 miles per hour.

The calmer time of year lasts for 5.4 months, from April 24 to October 6. The calmest month of the year in L'Île-Rousse is August, with an average hourly wind speed of 7.3 miles per hour.

The predominant average hourly wind direction in L'Île-Rousse varies throughout the year.

The wind is most often from the east for 6.0 days, from January 19 to January 25; for 1.4 weeks, from February 1 to February 11; for 1.4 weeks, from February 23 to March 4; and for 1.9 months, from October 9 to December 7, with a peak percentage of 34% on November 4. The wind is most often from the west for 1.0 weeks, from January 25 to February 1; for 1.7 weeks, from February 11 to February 23; for 7.2 months, from March 4 to October 9; and for 1.4 months, from December 7 to January 19, with a peak percentage of 45% on August 2.

L'Île-Rousse 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 significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.6 months, from June 30 to September 19, with an average temperature above 72°F. The month of the year in L'Île-Rousse with the warmest water is August, with an average temperature of 75°F.

The time of year with cooler water lasts for 4.6 months, from December 8 to April 27, with an average temperature below 60°F. The month of the year in L'Île-Rousse with the coolest water is February, with an average temperature of 56°F.

To characterize how pleasant the weather is in L'Île-Rousse 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 times of year to visit L'Île-Rousse for general outdoor tourist activities are from mid May to early August and from mid August to early October, with a peak score in the last week of June.

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 L'Île-Rousse for hot-weather activities is from late June to late 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).

While it does not do so every year, freezing temperatures are seen in L'Île-Rousse over some winters. The day least likely to be in the growing season is January 16, with a 67% chance.

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 L'Île-Rousse should appear around February 8, only rarely appearing before January 25 or after February 24.

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 8 to August 16, with an average daily incident shortwave energy per square meter above 6.6 kWh. The brightest month of the year in L'Île-Rousse is July, with an average of 7.7 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 2.9 kWh. The darkest month of the year in L'Île-Rousse is December, with an average of 1.7 kWh.

For the purposes of this report, the geographical coordinates of L'Île-Rousse are 42.634 deg latitude, 8.938 deg longitude, and 20 ft elevation.

The topography within 2 miles of L'Île-Rousse contains very significant variations in elevation, with a maximum elevation change of 1,581 feet and an average elevation above sea level of 208 feet. Within 10 miles contains very significant variations in elevation (6,309 feet). Within 50 miles also contains extreme variations in elevation (8,727 feet).

The area within 2 miles of L'Île-Rousse is covered by water (44%), shrubs (19%), grassland (13%), and cropland (12%), within 10 miles by water (49%) and shrubs (15%), and within 50 miles by water (70%) and trees (12%).