Thermal baths — Velletri
Climate — Velletri: monthly averages
| Month | Day (max) | Night (min) | Monthly precipitation |
|---|---|---|---|
| January | 17°C | 1°C | 91 mm |
| February | 18°C | 1°C | 86 mm |
| March | 20°C | 2°C | 80 mm |
| April | 24°C | 4°C | 62 mm |
| May | 28°C | 10°C | 57 mm |
| June | 32°C | 13°C | 30 mm |
| July | 32°C | 19°C | 25 mm |
| August | 34°C | 19°C | 27 mm |
| September | 30°C | 14°C | 80 mm |
| October | 26°C | 11°C | 95 mm |
| November | 24°C | 6°C | 135 mm |
| December | 19°C | 2°C | 110 mm |
Long-term model averages for an area of about 50 km — not a forecast; mountains are often cooler. Source: NASA POWER Project (CC BY 4.0) (2001–2025)