Riyadh
Saudi Arabia
| Season | Autumn | Winter | Spring | Summer | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Year |
| Record high, °C | 46 | 42 | 37 | 32 | 32 | 36 | 38 | 41 | 45 | 47 | 47 | 46 | 47 |
| Average high, °C | 41 | 36 | 29 | 25 | 22 | 25 | 29 | 33 | 38 | 41 | 41 | 41 | 33 |
| Average temperature, °C | 33 | 29 | 23 | 19 | 18 | 19 | 23 | 27 | 31 | 34 | 33 | 35 | 27 |
| Average low, °C | 27 | 22 | 17 | 13 | 12 | 13 | 17 | 21 | 25 | 28 | 28 | 29 | 21 |
| Record low, °C | 20 | 11 | 5 | 1 | 0 | 2 | 1 | 12 | 13 | 18 | 18 | 21 | 0 |
| Thunderstorms, days | 0 | 1 | 1 | 0 | 0 | 0 | 1 | 2 | 1 | 0 | 0 | 0 | 6 |
| Average precipitation, mm. | 0 | 2 | 12 | 5 | 8 | 2 | 12 | 15 | 5 | 0 | 0 | 0 | 61 |
| Relative humidity, % | 21 | 25 | 39 | 42 | 42 | 37 | 31 | 29 | 21 | 17 | 19 | 21 | 29 |
| Relative humidity morning, % | 20 | 29 | 44 | 51 | 51 | 44 | 38 | 34 | 25 | 18 | 20 | 22 | 33 |
| Relative humidity evening, % | 8 | 12 | 22 | 27 | 28 | 21 | 18 | 14 | 11 | 7 | 8 | 8 | 15 |
| Wind speed, km/h | 10 | 10 | 10 | 8 | 12 | 10 | 12 | 12 | 12 | 12 | 13 | 12 | 11 |
| Day Length, часов | 13 | 12 | 11 | 11 | 11 | 12 | 12 | 12 | 14 | 14 | 14 | 13 | 13 |
| Dew point, °C | 8 | 7 | 9 | 6 | 4 | 4 | 5 | 8 | 6 | 5 | 7 | 9 | 78 |
| Growing degree-day, °C | 699 | 577 | 396 | 276 | 233 | 266 | 412 | 507 | 654 | 714 | 719 | 760 | 6212 |
| Solar radiation, global, Mj/m2 | 22 | 20 | 16 | 15 | 16 | 19 | 21 | 24 | 25 | 27 | 26 | 24 | 21 |