Climate zones in Italian locations

Climate zones in Italian locations

Climatic zones and degree days of Italian locations

variety of climatic conditions

Italy, with its geographical and climatic diversity, offers a variety of climatic conditions ranging from northern regions with cold winters to southern areas with hot and dry summers. Understanding the climate zones of Italian locations is fundamental for a number of sectors, including construction, plant and energy design, agriculture and many others.

This guide was created by Itieffe to explore the climatic zones of Italian locations in detail, offering a complete overview of the country's climatic characteristics.

We will present the objectives and contents of this guide, which aims to provide useful and practical information on the climate of the different Italian regions.

Knowledge of local climate zones is essential to address a variety of challenges and opportunities. These zones influence building design, choice of materials, agricultural practices, water management and urban planning.

Understanding the local climate is key to adapting to climate change, improving energy efficiency and promoting sustainable development.

What you will find in this guide:

  • An overview of the different climate zones present in Italy, with a geographical subdivision and a description of the climatic characteristics.
  • Detailed information on average temperatures and other climate parameters.

Understanding local climate zones is critical to Italy's sustainable future. Climate-informed planning and design helps improve resilience to extreme climate events, reduce environmental impacts and promote a better quality of life for local communities.

We are happy to share this informative guide on climate zones with you. Knowing the local climate is the first step to making informed decisions and contributing to a more sustainable future for Italy.

Climate zones in Italian locations

The subdivision of the Italian territory into climatic zones is to be attributed to Presidential Decree No. 412 of 26/08/1993 Regulation laying down rules for the design, installation, operation and maintenance of thermal systems in buildings for the purpose of containing energy consumption, in implementation of art. 4, paragraph 4, of the law 9 January 1991, n. 10, a decree implementing law 10/91, the framework law on the rational use of energy and energy saving on the national territory.

There are six climatic zones, they are identified by the alphabetical letters (A, B, C, D, E, F) and each is defined according to the values ​​assumed by a decidedly peculiar quantity, the degree-days (GG).

Degree days are specific to each location, regardless of its geographical location.

Therefore each Municipality of Italy is characterized by a specific degree-day value.

Colloquially it is said "To each Municipality of Italy there is a number of degree-days".

From a mathematical point of view, the degree-days of a locality are calculated as the sum, extended to all the days of a conventional annual heating period, of only the daily positive differences between the ambient temperature, conventionally fixed at 20 ° C, and the average daily outdoor temperature.

As a result, the number of degree-days increases as the external temperature decreases (generalizing: cold locations correspond to high degree-day values; warm locations correspond to low degrees of degrees).

Since the number of degree-days of a locality depends on the average daily external temperature, it is possible to understand the reason why, even places located in the same region and / or in the same provincial catchment area, are characterized by a different number of degree-days .

average daily external temperature

The average daily external temperature is influenced by geographical factors, primarily the height above sea level but also the protection from prevailing winds, proximity to the sea or to bodies of water, etc.

Example: Rome - Number of degree-days: 1.415 - Rocca di Papa (RM) - Number of degree-days: 2.399 m, Rocca di Papa is at 680 m above sea level while Rome is only 20 m.

By virtue of the geographical conformation of the Italian territory (mountainous areas adjacent to flat and / or lake and / or marine areas), from a practical point of view, the distribution of degree-days, characteristic of each municipality in Italy, is leopard".

Information on the number of degree-days of each municipality in Italy is contained in the attachment A of Presidential Decree No. 412 of 26/08/1993.

Italian municipalities

Once each Municipality of Italy was assigned a number of degree-days, the Municipalities were merged by climatic zones, or by range of number of degree-days.

In this case, the municipalities that have a number of degree days:

a) no more than 600 are included in climatic zone A [in equivalent terms: climatic zone A includes municipalities with a number of degree-days not exceeding 600.

b) greater than 600 and not more than 900 are included in climatic zone B [in equivalent terms: climatic zone B includes municipalities with a number of degree-days greater than 600 and not greater than 900.

c) greater than 900 and not greater than 1.400 are included in climatic zone C [in equivalent terms: climatic zone C includes municipalities with a number of degree-days greater than 900 and not greater than 1.400.

d) greater than 1.400 and not greater than 2.100 belong to climatic zone D [in equivalent terms: climatic zone D includes municipalities with a number of degree-days greater than 1.400 and not greater than 2.100.

e) greater than 2.100 and no more than 3.000 belong to climatic zone E [in equivalent terms: climatic zone E includes municipalities with a number of degree-days greater than 2.100 and not greater than 3.000.

f) greater than 3.000 belong to the climatic zone F [in equivalent terms: the climatic zone F includes the municipalities that have a number of degree-days greater than 3.000.

It's still Annex A of Presidential Decree No. 412 of 26/08/1993 to indicate the climatic zone to which each municipality in Italy belongs.

For the climatic zones the same observations made for the degree-days apply, therefore, in the first instance, the peculiar geographic conformation of Italy means that even the distribution of the climatic zones on the territory is not homogeneously distributed.

This also justifies the fact that Municipalities, located in the same region and / or in the same provincial catchment area, are characterized by a different climatic zone.

Please refer to the file - “Indicative city data"and "Indicative country data”- for the detail of the Degrees-Day for each location.

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Climate zones in Italian locations

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