Evapotranspiration Calculations
Perth Airport - May 2026 daily calculations
| Date | Evapotrans- piration (mm) 0000- 2400 | Rain (mm) 0900- 0900 | Pan Evaporation (mm) 0900- 0900 | Max Temp | Min Temp | Max Rel Hum (%) | Min Rel Hum (%) | Average 10m Wind Speed (m/sec) | Solar Radiation (MJ/sq m) |
|---|---|---|---|---|---|---|---|---|---|
| 01/05/2026 | 3.4 | 0.6 | 2.4 | 18.9 | 11.4 | 93 | 37 | 5.89 | 14.23 |
| 02/05/2026 | 2.6 | 0.0 | 3.6 | 19.2 | 3.1 | 95 | 42 | 3.23 | 14.28 |
| 03/05/2026 | 2.4 | 0.0 | 1.8 | 20.8 | 4.7 | 95 | 47 | 2.62 | 14.63 |
| 04/05/2026 | 3.2 | 0.0 | 3.4 | 23.6 | 7.2 | 92 | 40 | 3.59 | 14.78 |
| 05/05/2026 | 3.6 | 0.0 | 3.2 | 24.6 | 10.0 | 90 | 35 | 3.91 | 14.63 |
| 06/05/2026 | 4.1 | 0.0 | 3.6 | 23.7 | 9.5 | 74 | 41 | 5.62 | 14.40 |
| 07/05/2026 | 4.3 | 0.0 | 3.0 | 23.7 | 10.7 | 73 | 34 | 5.38 | 14.43 |
| 08/05/2026 | 4.6 | 0.0 | 4.8 | 24.0 | 11.3 | 71 | 33 | 5.80 | 14.30 |
| 09/05/2026 | 5.0 | 0.0 | 24.1 | 13.8 | 55 | 25 | 5.39 | 14.18 | |
| 10/05/2026 | 4.4 | 0.0 | 4.0 | 25.3 | 11.4 | 63 | 25 | 4.22 | 14.07 |
| 11/05/2026 | 4.9 | 0.0 | 4.0 | 27.9 | 11.3 | 58 | 16 | 3.93 | 13.97 |
| 12/05/2026 | 4.4 | 0.0 | 4.2 | 28.9 | 10.0 | 71 | 15 | 3.17 | 13.86 |
| 13/05/2026 | 3.5 | 0.0 | 4.4 | 25.1 | 7.4 | 93 | 27 | 3.36 | 13.32 |
| 14/05/2026 | 2.0 | 0.0 | 3.0 | 21.0 | 10.6 | 95 | 56 | 3.24 | 7.01 |
| 15/05/2026 | 2.2 | 1.4 | 1.6 | 21.0 | 7.2 | 95 | 50 | 2.92 | 12.03 |
| 16/05/2026 | 2.2 | 0.4 | 2.2 | 21.5 | 7.6 | 94 | 48 | 2.59 | 11.72 |
| 17/05/2026 | 2.3 | 0.0 | 1.8 | 22.6 | 6.4 | 95 | 46 | 2.46 | 13.00 |
| Totals: | 59.1 | 2.4 | 51.0 |
