Rome
Italy
| Season | Autumn | Winter | Spring | Summer | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Year |
| Record high, °C | 37 | 33 | 28 | 26 | 22 | 20 | 25 | 30 | 31 | 37 | 41 | 37 | 41 |
| Average high, °C | 27 | 23 | 18 | 15 | 14 | 14 | 16 | 18 | 22 | 26 | 30 | 30 | 21 |
| Average temperature, °C | 24 | 20 | 16 | 12 | 11 | 11 | 12 | 15 | 18 | 23 | 26 | 27 | 18 |
| Average low, °C | 20 | 17 | 12 | 9 | 8 | 8 | 9 | 11 | 15 | 19 | 23 | 23 | 15 |
| Record low, °C | 11 | 8 | 5 | -5 | 1 | -6 | -1 | 3 | 7 | 12 | 16 | 11 | -6 |
| Rain, days | 10 | 17 | 24 | 28 | 23 | 22 | 19 | 18 | 12 | 8 | 4 | 6 | 191 |
| Fog, days | 19 | 16 | 8 | 6 | 10 | 9 | 17 | 18 | 24 | 24 | 28 | 24 | 203 |
| Thunderstorms, days | 5 | 7 | 5 | 4 | 3 | 3 | 4 | 2 | 2 | 2 | 2 | 4 | 43 |
| Average precipitation, mm. | 55 | 109 | 107 | 117 | 113 | 98 | 84 | 60 | 32 | 14 | 19 | 24 | 832 |
| Relative humidity, % | 68 | 70 | 73 | 74 | 73 | 71 | 69 | 69 | 67 | 64 | 63 | 66 | 69 |
| Relative humidity morning, % | 77 | 82 | 81 | 79 | 82 | 79 | 79 | 78 | 75 | 75 | 72 | 74 | 78 |
| Relative humidity evening, % | 65 | 70 | 69 | 68 | 69 | 65 | 64 | 66 | 62 | 60 | 57 | 61 | 65 |
| Wind speed, km/h | 17 | 14 | 14 | 14 | 16 | 16 | 17 | 17 | 19 | 19 | 22 | 19 | 17 |
| Day Length, часов | 13 | 12 | 11 | 10 | 10 | 11 | 12 | 14 | 15 | 15 | 15 | 14 | 13 |
| Dew point, °C | 18 | 16 | 11 | 7 | 7 | 6 | 7 | 10 | 12 | 16 | 19 | 20 | 149 |
| Growing degree-day, °C | 417 | 327 | 175 | 78 | 52 | 39 | 86 | 150 | 276 | 392 | 525 | 525 | 3041 |
| Solar radiation, global, Mj/m2 | 16 | 12 | 7 | 6 | 7 | 9 | 14 | 17 | 22 | 25 | 26 | 23 | 15 |