Rome
Italy
| Season | Autumn | Winter | Spring | Summer | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Year |
| Record high, °C | 38 | 35 | 26 | 22 | 22 | 22 | 27 | 31 | 32 | 40 | 42 | 40 | 42 |
| Average high, °C | 25 | 21 | 17 | 14 | 12 | 13 | 15 | 18 | 22 | 26 | 28 | 28 | 20 |
| Average temperature, °C | 21 | 17 | 13 | 10 | 9 | 9 | 11 | 13 | 18 | 21 | 24 | 24 | 16 |
| Average low, °C | 17 | 13 | 9 | 6 | 5 | 5 | 7 | 9 | 13 | 17 | 19 | 19 | 12 |
| Record low, °C | 8 | 6 | -1 | -2 | -2 | -2 | -2 | 1 | 6 | 10 | 13 | 12 | -2 |
| Rain, days | 9 | 14 | 15 | 16 | 12 | 15 | 15 | 15 | 14 | 13 | 7 | 9 | 154 |
| Snow, days | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 4 |
| Fog, days | 23 | 23 | 23 | 22 | 26 | 24 | 27 | 23 | 24 | 22 | 22 | 22 | 281 |
| Thunderstorms, days | 4 | 3 | 1 | 1 | 1 | 1 | 1 | 2 | 3 | 4 | 4 | 5 | 30 |
| Average precipitation, mm. | 62 | 65 | 54 | 63 | 51 | 57 | 52 | 47 | 37 | 32 | 27 | 39 | 586 |
| Relative humidity, % | 68 | 72 | 76 | 78 | 77 | 74 | 72 | 68 | 68 | 65 | 64 | 65 | 71 |
| Relative humidity morning, % | 81 | 84 | 85 | 83 | 83 | 82 | 83 | 80 | 77 | 71 | 68 | 74 | 79 |
| Relative humidity evening, % | 65 | 68 | 71 | 70 | 69 | 66 | 65 | 62 | 62 | 61 | 59 | 62 | 65 |
| Wind speed, km/h | 9 | 9 | 12 | 12 | 12 | 12 | 12 | 14 | 12 | 12 | 14 | 9 | 12 |
| Day Length, часов | 13 | 12 | 10 | 10 | 10 | 11 | 12 | 14 | 15 | 16 | 15 | 14 | 13 |
| Dew point, °C | 15 | 12 | 8 | 5 | 4 | 4 | 6 | 7 | 11 | 14 | 16 | 17 | 119 |
| Growing degree-day, °C | 328 | 214 | 93 | 0 | 0 | 0 | 22 | 103 | 234 | 336 | 426 | 425 | 2182 |
| Solar radiation, global, Mj/m2 | 19 | 12 | 7 | 6 | 7 | 10 | 15 | 20 | 24 | 28 | 28 | 24 | 17 |