Climate and Average Weather Year Round in Porretta Terme Italy

In Porretta Terme, the summers are short, warm, and mostly clear and the winters are very cold and partly cloudy. Over the course of the year, the temperature typically varies from 31°F to 81°F and is rarely below 22°F or above 88°F.

Based on the beach/pool score, the best time of year to visit Porretta Terme for hot-weather activities is from early July to mid August.

The warm season lasts for 2.9 months, from June 12 to September 9, with an average daily high temperature above 73°F. The hottest month of the year in Porretta Terme is July, with an average high of 80°F and low of 62°F.

The cold season lasts for 3.6 months, from November 17 to March 6, with an average daily high temperature below 49°F. The coldest month of the year in Porretta Terme is January, with an average low of 31°F and high of 42°F.

In Porretta Terme, 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 Porretta Terme begins around June 5 and lasts for 3.5 months, ending around September 21.

The clearest month of the year in Porretta Terme is July, during which on average the sky is clear, mostly clear, or partly cloudy 80% of the time.

The cloudier part of the year begins around September 21 and lasts for 8.5 months, ending around June 5.

The cloudiest month of the year in Porretta Terme is November, during which on average the sky is overcast or mostly cloudy 57% 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 Porretta Terme varies throughout the year.

The wetter season lasts 9.3 months, from September 7 to June 15, with a greater than 23% chance of a given day being a wet day. The month with the most wet days in Porretta Terme is November, with an average of 8.6 days with at least 0.04 inches of precipitation.

The drier season lasts 2.7 months, from June 15 to September 7. The month with the fewest wet days in Porretta Terme is July, with an average of 4.9 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 Porretta Terme is April, with an average of 8.4 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 3.

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. Porretta Terme experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Porretta Terme. The month with the most rain in Porretta Terme is October, with an average rainfall of 3.2 inches.

The month with the least rain in Porretta Terme is July, with an average rainfall of 1.1 inches.

Snowfall

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

The snowy period of the year lasts for 2.6 months, from December 16 to March 4, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Porretta Terme is January, with an average snowfall of 1.6 inches.

The snowless period of the year lasts for 9.4 months, from March 4 to December 16. The least snow falls around July 26, with an average total accumulation of 0.0 inches.

The length of the day in Porretta Terme varies significantly over the course of the year. In 2024, the shortest day is December 21, with 8 hours, 52 minutes of daylight; the longest day is June 20, with 15 hours, 31 minutes of daylight.

The earliest sunrise is at 5:32 AM on June 15, and the latest sunrise is 2 hours, 19 minutes later at 7:51 AM on January 3. The earliest sunset is at 4:37 PM on December 9, and the latest sunset is 4 hours, 26 minutes later at 9:03 PM on June 26.

Daylight saving time (DST) is observed in Porretta Terme 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.

Porretta Terme experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 2.4 months, from June 22 to September 5, 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 Porretta Terme is August, with 2.7 days that are muggy or worse.

The least muggy day of the year is March 9, 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 Porretta Terme experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.7 months, from October 12 to May 3, with average wind speeds of more than 6.0 miles per hour. The windiest month of the year in Porretta Terme is March, with an average hourly wind speed of 7.0 miles per hour.

The calmer time of year lasts for 5.3 months, from May 3 to October 12. The calmest month of the year in Porretta Terme is August, with an average hourly wind speed of 5.1 miles per hour.

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

The wind is most often from the east for 1.6 months, from February 11 to March 29 and for 2.7 months, from August 28 to November 19, with a peak percentage of 34% on March 1. The wind is most often from the west for 3.4 months, from May 16 to August 28, with a peak percentage of 36% on July 8. The wind is most often from the north for 2.7 months, from November 19 to February 11, with a peak percentage of 31% on January 1.

Porretta Terme 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 2.7 months, from June 28 to September 18, with an average temperature above 73°F. The month of the year in Porretta Terme with the warmest water is August, with an average temperature of 77°F.

The time of year with cooler water lasts for 4.4 months, from December 13 to April 25, with an average temperature below 60°F. The month of the year in Porretta Terme with the coolest water is February, with an average temperature of 56°F.

To characterize how pleasant the weather is in Porretta Terme 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 Porretta Terme for general outdoor tourist activities is from mid June to early September, with a peak score in the second 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 Porretta Terme for hot-weather activities is from early July to mid August, with a peak score in the last 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 Porretta Terme typically lasts for 7.7 months (237 days), from around March 24 to around November 16, rarely starting before February 29 or after April 17, and rarely ending before October 28 or after December 6.

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 Porretta Terme should appear around April 20, only rarely appearing before April 7 or after May 3.

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 11 to August 17, with an average daily incident shortwave energy per square meter above 6.1 kWh. The brightest month of the year in Porretta Terme is July, with an average of 7.2 kWh.

The darker period of the year lasts for 3.6 months, from October 27 to February 16, with an average daily incident shortwave energy per square meter below 2.6 kWh. The darkest month of the year in Porretta Terme is December, with an average of 1.4 kWh.

For the purposes of this report, the geographical coordinates of Porretta Terme are 44.163 deg latitude, 10.974 deg longitude, and 1,122 ft elevation.

The topography within 2 miles of Porretta Terme contains very significant variations in elevation, with a maximum elevation change of 1,755 feet and an average elevation above sea level of 1,620 feet. Within 10 miles contains very significant variations in elevation (5,673 feet). Within 50 miles also contains extreme variations in elevation (7,129 feet).

The area within 2 miles of Porretta Terme is covered by trees (57%), cropland (30%), and artificial surfaces (12%), within 10 miles by trees (76%) and cropland (20%), and within 50 miles by cropland (47%) and trees (41%).