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Summer Weather at Bastia-Poretta France

Daily high temperatures increase by 7°F, from 75°F to 82°F, rarely falling below 69°F or exceeding 89°F. The highest daily average high temperature is 85°F on August 6.

Daily low temperatures increase by 7°F, from 58°F to 65°F, rarely falling below 53°F or exceeding 72°F. The highest daily average low temperature is 68°F on August 6.

For reference, on August 5, the hottest day of the year, temperatures at Bastia-Poretta typically range from 68°F to 85°F, while on February 6, the coldest day of the year, they range from 41°F to 56°F.

Average High and Low Temperature in the Summer at Bastia-Poretta

Average High and Low Temperature in the Summer at Bastia-PorettaJunJulAug45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°F90°F90°FSpringFallAug 585°FAug 585°F68°F68°FJun 175°FJun 175°F58°F58°FAug 3182°FAug 3182°F65°F65°FJul 182°FJul 182°F64°F64°F
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average summer temperatures. The horizontal axis is the day, 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 the Summer at Bastia-Poretta

Average Hourly Temperature in the Summer at Bastia-PorettaJunJulAug12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMSpringFallcoldcoolcoolcoolcomfortablewarmcool
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Nevada City, California, United States (5,997 miles away); Punta Alta, Argentina (7,198 miles); and La Plata, Argentina (6,844 miles) are the far-away foreign places with temperatures most similar to Bastia-Poretta (view comparison).

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The summer at Bastia-Poretta experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 35% to 25%. The lowest chance of overcast or mostly cloudy conditions is 13% on July 20.

The clearest day of the summer is July 20, with clear, mostly clear, or partly cloudy conditions 87% of the time.

For reference, on November 24, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 49%, while on July 20, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 87%.

Cloud Cover Categories in the Summer at Bastia-Poretta

Cloud Cover Categories in the Summer at Bastia-PorettaJunJulAug0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SpringFallNov 2451%Nov 2451%Jun 164%Jun 164%Aug 3175%Aug 3175%Jul 182%Jul 182%Aug 185%Aug 185%clearmostly clearovercastmostly cloudypartly cloudy
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Bastia-Poretta, the chance of a wet day over the course of the summer is essentially constant, remaining around 9% throughout.

For reference, the year's highest daily chance of a wet day is 31% on November 18, and its lowest chance is 5% on July 13.

Probability of Precipitation in the Summer at Bastia-Poretta

Probability of Precipitation in the Summer at Bastia-PorettaJunJulAug0%0%2%2%4%4%6%6%8%8%10%10%12%12%14%14%16%16%18%18%20%20%22%22%24%24%SpringFallJul 135%Jul 135%Jun 112%Jun 112%Aug 3113%Aug 3113%Jul 17%Jul 17%Aug 15%Aug 15%rain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the summer at Bastia-Poretta is essentially constant, remaining about 0.8 inches throughout, and rarely exceeding 3.1 inches.

The lowest average 31-day accumulation is 0.3 inches on July 19.

Average Monthly Rainfall in the Summer at Bastia-Poretta

Average Monthly Rainfall in the Summer at Bastia-PorettaJunJulAug0 in0 in1 in1 in2 in2 in3 in3 in4 in4 inSpringFallJul 190.3 inJul 190.3 inJun 11.1 inJun 11.1 inAug 311.3 inAug 311.3 inJul 10.5 inJul 10.5 inAug 10.4 inAug 10.4 in
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.

Over the course of the summer at Bastia-Poretta, the length of the day is rapidly decreasing. From the start to the end of the season, the length of the day decreases by 1 hour, 55 minutes, implying an average daily decrease of 1 minute, 16 seconds, and weekly decrease of 8 minutes, 51 seconds.

The shortest day of the summer is August 31, with 13 hours, 11 minutes of daylight and the longest day is June 20, with 15 hours, 19 minutes of daylight.

Hours of Daylight and Twilight in the Summer at Bastia-Poretta

Hours of Daylight and Twilight in the Summer at Bastia-PorettaJunJulAug0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrSpringFallJun 2015 hr, 19 minJun 2015 hr, 19 minnightnightdaydayAug 3113 hr, 11 minAug 3113 hr, 11 minAug 114 hr, 27 minAug 114 hr, 27 min
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise of the summer at Bastia-Poretta is 5:43 AM on June 14 and the latest sunrise is 1 hour, 2 minutes later at 6:46 AM on August 31.

The latest sunset is 9:03 PM on June 27 and the earliest sunset is 1 hour, 6 minutes earlier at 7:57 PM on August 31.

Daylight saving time is observed at Bastia-Poretta during 2024, but it neither starts nor ends during the summer, so the entire season is in daylight saving time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:44 AM and sets 15 hours, 19 minutes later, at 9:03 PM, while on December 21, the shortest day of the year, it rises at 7:48 AM and sets 9 hours, 3 minutes later, at 4:51 PM.

Sunrise & Sunset with Twilight in the Summer at Bastia-Poretta

Sunrise & Sunset with Twilight in the Summer at Bastia-PorettaJunJulAug2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMSpringFall5:43 AM5:43 AMJun 149:01 PMJun 149:01 PM6:46 AM6:46 AMAug 317:57 PMAug 317:57 PM5:48 AM5:48 AMJul 19:03 PMJul 19:03 PM6:14 AM6:14 AMAug 18:41 PMAug 18:41 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day in the summer. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in the Summer at Bastia-Poretta

Solar Elevation and Azimuth in the Summer at Bastia-PorettaJunJulAug12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMSpringFall001020203030405050606000101020303040405060
northeastsouthwest
Solar elevation and azimuth in the the summer of 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for the summer of 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. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in the Summer at Bastia-Poretta

Moon Rise, Set & Phases in the Summer at Bastia-PorettaJunJulAug12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMSpringFallMay 85:23 AMMay 85:23 AMMay 233:54 PMMay 233:54 PMJun 62:38 PMJun 62:38 PMJun 223:09 AMJun 223:09 AMJul 612:58 AMJul 612:58 AMJul 2112:18 PMJul 2112:18 PMAug 41:14 PMAug 41:14 PMAug 198:26 PMAug 198:26 PMSep 33:56 AMSep 33:56 AMSep 184:35 AMSep 184:35 AM5:58 AM5:58 AM9:23 PM9:23 PM9:09 PM9:09 PM5:58 AM5:58 AM9:30 PM9:30 PM9:08 PM9:08 PM5:31 AM5:31 AM9:16 PM9:16 PM8:46 PM8:46 PM5:30 AM5:30 AM9:04 PM9:04 PM8:29 PM8:29 PM7:05 AM7:05 AM6:57 AM6:57 AM8:12 PM8:12 PM7:18 PM7:18 PM7:16 AM7:16 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

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 chance that a given day will be muggy at Bastia-Poretta is very rapidly increasing during the summer, rising from 7% to 37% over the course of the season.

The highest chance of a muggy day during the summer is 52% on August 5.

For reference, on August 5, the muggiest day of the year, there are muggy conditions 52% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in the Summer at Bastia-Poretta

Humidity Comfort Levels in the Summer at Bastia-PorettaJunJulAug0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%SpringFallAug 552%Aug 552%Jun 17%Jun 17%Aug 3137%Aug 3137%Jul 138%Jul 138%oppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortabledrydrymiserablemiserable
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

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 is essentially constant during the summer, remaining within 0.6 miles per hour of 6.5 miles per hour throughout.

For reference, on December 15, the windiest day of the year, the daily average wind speed is 10.8 miles per hour, while on August 4, the calmest day of the year, the daily average wind speed is 5.8 miles per hour.

The lowest daily average wind speed during the summer is 5.8 miles per hour on August 4.

Average Wind Speed in the Summer at Bastia-Poretta

Average Wind Speed in the Summer at Bastia-PorettaJunJulAug0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mphSpringFallAug 45.8 mphAug 45.8 mphJun 17.1 mphJun 17.1 mphAug 317.0 mphAug 317.0 mphJul 16.5 mphJul 16.5 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The wind direction at Bastia-Poretta during the summer is predominantly out of the west from June 1 to July 19 and from August 20 to August 31 and the north from July 19 to August 20.

Wind Direction in the Summer at Bastia-Poretta

Wind Direction in the Summer at Bastia-PorettaWNWJunJulAug0%100%20%80%40%60%60%40%80%20%100%0%SpringFallwestsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

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 surface water temperature at Bastia-Poretta is rapidly increasing during the summer, rising by 8°F, from 67°F to 75°F, over the course of the season.

The highest average surface water temperature during the summer is 77°F on August 10.

Average Water Temperature in the Summer at Bastia-Poretta

Average Water Temperature in the Summer at Bastia-PorettaJunJulAug60°F60°F65°F65°F70°F70°F75°F75°F80°F80°FSpringFallAug 1077°FAug 1077°FJun 167°FJun 167°FAug 3175°FAug 3175°FJul 173°FJul 173°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

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.

Time Spent in Various Temperature Bands and the Growing Season in the Summer at Bastia-Poretta

Time Spent in Various Temperature Bands and the Growing Season in the Summer at Bastia-Porettagrowing seasonJunJulAug0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SpringFall100%Jul 17100%Jul 17coldcoolcomfortablewarmhot
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

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.

The average accumulated growing degree days at Bastia-Poretta are very rapidly increasing during the summer, increasing by 2,169°F, from 869°F to 3,038°F, over the course of the season.

Growing Degree Days in the Summer at Bastia-Poretta

Growing Degree Days in the Summer at Bastia-PorettaJunJulAug1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°F3,000°F3,000°FSpringFallJun 1869°FJun 1869°FAug 313,038°FAug 313,038°FJul 11,481°FJul 11,481°FAug 12,273°FAug 12,273°F
The average growing degree days accumulated over the course of the summer, with 25th to 75th and 10th to 90th percentile bands.

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 at Bastia-Poretta is decreasing during the summer, falling by 1.5 kWh, from 7.4 kWh to 5.9 kWh, over the course of the season.

The highest average daily incident shortwave solar energy during the summer is 7.9 kWh on July 5.

Average Daily Incident Shortwave Solar Energy in the Summer at Bastia-Poretta

Average Daily Incident Shortwave Solar Energy in the Summer at Bastia-PorettaJunJulAug0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhSpringFallJul 57.9 kWhJul 57.9 kWhJun 17.4 kWhJun 17.4 kWhAug 315.9 kWhAug 315.9 kWhAug 17.2 kWhAug 17.2 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

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%).

This report illustrates the typical weather at Bastia-Poretta, 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

Bastia-Poretta has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back include but are not limited to Solenzara Air Base, Calvi - Sainte-Catherine Airport, Ajaccio Napoleon Bonaparte Airport, Figari - Sud-Corse, Pisa International Airport, Grosseto Airport, Monte Argentario, and Capo Mele.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

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