Climate and Average Weather Year Round at Bastia-Poretta France

At Bastia-Poretta, 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 41°F to 85°F and is rarely below 35°F or above 89°F.

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

The warm season lasts for 2.7 months, from June 19 to September 11, with an average daily high temperature above 79°F. The hottest month of the year at Bastia-Poretta is August, with an average high of 84°F and low of 67°F.

The cool season lasts for 4.4 months, from November 20 to April 1, with an average daily high temperature below 62°F. The coldest month of the year at Bastia-Poretta is January, with an average low of 42°F and high of 56°F.

At Bastia-Poretta, 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 at Bastia-Poretta begins around June 12 and lasts for 3.0 months, ending around September 11.

The clearest month of the year at Bastia-Poretta 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 12.

The cloudiest month of the year at Bastia-Poretta is November, during which on average the sky is overcast or mostly cloudy 48% 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 at Bastia-Poretta varies throughout the year.

The wetter season lasts 7.7 months, from September 17 to May 7, with a greater than 18% chance of a given day being a wet day. The month with the most wet days at Bastia-Poretta is November, with an average of 8.9 days with at least 0.04 inches of precipitation.

The drier season lasts 4.3 months, from May 7 to September 17. The month with the fewest wet days at Bastia-Poretta 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 at Bastia-Poretta is November, with an average of 8.9 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. Bastia-Poretta experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year at Bastia-Poretta. The month with the most rain at Bastia-Poretta is November, with an average rainfall of 3.0 inches.

The month with the least rain at Bastia-Poretta is July, with an average rainfall of 0.3 inches.

The length of the day at Bastia-Poretta 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 5:43 AM on June 14, and the latest sunrise is 2 hours, 8 minutes later at 7:52 AM on January 4. The earliest sunset is at 4:48 PM on December 9, and the latest sunset is 4 hours, 15 minutes later at 9:03 PM on June 27.

Daylight saving time (DST) is observed at Bastia-Poretta 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.

Bastia-Poretta experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.9 months, from June 8 to October 4, during which time the comfort level is muggy, oppressive, or miserable at least 13% of the time. The month with the most muggy days at Bastia-Poretta is July, with 14.7 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 at Bastia-Poretta experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 6.8 months, from October 3 to April 26, with average wind speeds of more than 8.3 miles per hour. The windiest month of the year at Bastia-Poretta is December, with an average hourly wind speed of 10.6 miles per hour.

The calmer time of year lasts for 5.3 months, from April 26 to October 3. The calmest month of the year at Bastia-Poretta is July, with an average hourly wind speed of 6.3 miles per hour.

The predominant average hourly wind direction at Bastia-Poretta varies throughout the year.

The wind is most often from the north for 1.0 months, from July 19 to August 20, with a peak percentage of 33% on August 6. The wind is most often from the west for 11 months, from August 20 to July 19, with a peak percentage of 34% on January 1.

Bastia-Poretta 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 29 to September 18, with an average temperature above 73°F. The month of the year at Bastia-Poretta with the warmest water is August, with an average temperature of 77°F.

The time of year with cooler water lasts for 4.7 months, from December 7 to April 29, with an average temperature below 60°F. The month of the year at Bastia-Poretta with the coolest water is February, with an average temperature of 56°F.

To characterize how pleasant the weather is at Bastia-Poretta 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 Bastia-Poretta for general outdoor tourist activities are from mid May to mid July and from late August to early October, with a peak score in the third 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 Bastia-Poretta 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 at Bastia-Poretta over some winters. The day least likely to be in the growing season is January 16, with a 60% 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 at Bastia-Poretta should appear around February 16, only rarely appearing before February 1 or after March 5.

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 at Bastia-Poretta is June, with an average of 7.7 kWh.

The darker period of the year lasts for 3.6 months, from October 26 to February 14, with an average daily incident shortwave energy per square meter below 3.0 kWh. The darkest month of the year at Bastia-Poretta is December, with an average of 1.8 kWh.

For the purposes of this report, the geographical coordinates of Bastia-Poretta are 42.553 deg latitude, 9.484 deg longitude, and 10 ft elevation.

The topography within 2 miles of Bastia-Poretta contains only modest variations in elevation, with a maximum elevation change of 177 feet and an average elevation above sea level of 21 feet. Within 10 miles contains only modest variations in elevation (4,035 feet). Within 50 miles also contains extreme variations in elevation (8,727 feet).

The area within 2 miles of Bastia-Poretta is covered by cropland (58%) and artificial surfaces (15%), within 10 miles by water (45%) and trees (25%), and within 50 miles by water (69%) and trees (13%).