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Climate — Siena: monthly averages
| Month | Day (max) | Night (min) | Monthly precipitation |
|---|---|---|---|
| January | 17°C | -7°C | 58 mm |
| February | 20°C | -9°C | 63 mm |
| March | 23°C | -9°C | 62 mm |
| April | 28°C | -4°C | 54 mm |
| May | 33°C | 3°C | 58 mm |
| June | 39°C | 7°C | 37 mm |
| July | 40°C | 11°C | 30 mm |
| August | 41°C | 10°C | 36 mm |
| September | 36°C | 5°C | 66 mm |
| October | 29°C | 0°C | 82 mm |
| November | 23°C | -4°C | 102 mm |
| December | 17°C | -8°C | 78 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)