Johannesburg
South Africa
| Season | Autumn | Winter | Spring | Summer | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Year |
| Average high, °C | 25 | 28 | 30 | 31 | 32 | 29 | 28 | 26 | 23 | 19 | 19 | 23 | 26 |
| Average temperature, °C | 17 | 19 | 21 | 23 | 24 | 23 | 21 | 17 | 14 | 10 | 10 | 13 | 18 |
| Average low, °C | 8 | 12 | 14 | 15 | 17 | 16 | 14 | 10 | 5 | 1 | 1 | 4 | 10 |
| Average precipitation, mm. | 20 | 46 | 61 | 70 | 96 | 79 | 77 | 48 | 17 | 8 | 4 | 8 | 533 |
| Relative humidity, % | 45 | 49 | 52 | 53 | 57 | 62 | 63 | 62 | 57 | 56 | 53 | 47 | 55 |
| Wind speed, km/h | 12 | 13 | 13 | 13 | 12 | 10 | 9 | 8 | 8 | 8 | 8 | 10 | 10 |
| Day Length, часов | 12 | 13 | 14 | 14 | 14 | 13 | 13 | 13 | 11 | 11 | 11 | 12 | 13 |
| Dew point, °C | 5 | 8 | 11 | 13 | 15 | 15 | 14 | 10 | 5 | 2 | 1 | 2 | 99 |
| Growing degree-day, °C | 198 | 291 | 342 | 397 | 419 | 353 | 335 | 222 | 112 | 0 | 0 | 93 | 2761 |
| Solar radiation, global, Mj/m2 | 22 | 22 | 24 | 25 | 25 | 23 | 20 | 17 | 16 | 14 | 16 | 18 | 20 |