Castel di Decima Temperature by Month

Castel di Decima, Lazio, Italy has an average annual maximum temperature of 21°C (70°F), ranging from 13°C (55°F) in January to 30°C (86°F) in August. Below you'll find a full monthly breakdown and a comparison with cities worldwide.

The climate in Castel di Decima is known for significant temperature differences throughout the year. At night, this contrast is just as clear, with lows ranging from 22°C (72°F) in August to 7°C (45°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Castel di Decima by month:

Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM. August, the city's warmest month, sees 298 hours of sunshine.

The chart below shows the average temperature throughout the year:

Castel di Decima's average annual maximum temperature is 21°C (70°F). To put that in context, here's how it compares to a few well-known destinations:

Lisbon, Portugal averages 21°C (70°F) annually, warm summers, mild winters, and rain mainly in the cooler months.

On the cooler end, Oslo, Norway averages just 10°C (50°F) annually, with pleasant summers but long, cold winters.

Shanghai, China averages 21°C (70°F) a year, with warm summers, mild winters, and a noticeable spring and autumn.

Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate, hot dry summers and mild wet winters.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In Castel di Decima, January is the coolest month, with average highs of 13°C (55°F) and humidity around 75%, considered high. In August, the warmest month, temperatures average 30°C (86°F) with 73% humidity, conditions that feel high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained, so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.

For more on Castel di Decima's weather, including monthly rainfall, sunshine hours, and humidity, visit our Castel di Decima climate page.