Evapotranspiration Calculations
Perth Airport - September 2025 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) |
|---|---|---|---|---|---|---|---|---|---|
| 01/09/2025 | 3.3 | 0.0 | 3.6 | 21.3 | 4.7 | 94 | 37 | 2.97 | 18.41 |
| 02/09/2025 | 3.2 | 0.2 | 2.4 | 22.1 | 7.3 | 95 | 42 | 3.15 | 16.31 |
| 03/09/2025 | 3.8 | 0.0 | 2.6 | 23.7 | 6.2 | 95 | 40 | 3.60 | 18.76 |
| 04/09/2025 | 3.5 | 0.0 | 5.0 | 20.2 | 7.9 | 93 | 37 | 3.56 | 18.84 |
| 05/09/2025 | 1.9 | 0.2 | 3.2 | 18.1 | 10.4 | 95 | 68 | 5.34 | 6.21 |
| 06/09/2025 | 2.2 | 37.8 | 2.4 | 16.2 | 10.5 | 97 | 65 | 5.88 | 10.99 |
| 07/09/2025 | 2.2 | 9.4 | 2.2 | 16.7 | 8.3 | 97 | 63 | 4.57 | 12.09 |
| 08/09/2025 | 2.9 | 11.2 | 2.2 | 16.5 | 6.2 | 96 | 43 | 3.58 | 18.97 |
| 09/09/2025 | 3.2 | 0.0 | 3.8 | 18.5 | 3.8 | 96 | 41 | 3.42 | 19.02 |
| 10/09/2025 | 3.5 | 0.0 | 1.8 | 20.6 | 4.0 | 93 | 39 | 3.30 | 19.83 |
| 11/09/2025 | 4.4 | 0.0 | 2.6 | 23.1 | 5.7 | 94 | 31 | 4.29 | 20.09 |
| 12/09/2025 | 6.5 | 0.0 | 4.8 | 26.7 | 9.3 | 61 | 18 | 5.65 | 19.66 |
| 13/09/2025 | 3.9 | 1.8 | 5.2 | 23.5 | 13.3 | 96 | 47 | 5.60 | 15.79 |
| 14/09/2025 | 3.0 | 11.0 | 4.0 | 17.8 | 14.6 | 96 | 51 | 8.00 | 10.70 |
| 15/09/2025 | 3.3 | 10.6 | 3.6 | 17.2 | 9.5 | 91 | 50 | 6.11 | 16.84 |
| 16/09/2025 | 3.1 | 0.6 | 3.0 | 18.6 | 4.7 | 94 | 43 | 3.54 | 16.15 |
| 17/09/2025 | 2.9 | 1.0 | 2.6 | 19.5 | 9.8 | 94 | 53 | 4.48 | 12.52 |
| 18/09/2025 | 3.2 | 10.4 | 2.6 | 19.6 | 9.2 | 96 | 46 | 4.04 | 15.81 |
| 19/09/2025 | 2.9 | 1.2 | 3.0 | 21.0 | 11.6 | 97 | 57 | 3.19 | 15.92 |
| 20/09/2025 | 3.7 | 0.0 | 2.4 | 24.4 | 7.6 | 98 | 50 | 2.66 | 21.69 |
| Totals: | 66.6 | 95.4 | 63.0 |
