Evapotranspiration Calculations
Perth Airport - October 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) |
|---|---|---|---|---|---|---|---|---|---|
| 01/10/2025 | 4.4 | 0.0 | 4.0 | 23.3 | 9.0 | 95 | 37 | 3.28 | 23.19 |
| 02/10/2025 | 5.3 | 0.0 | 5.2 | 28.4 | 6.8 | 95 | 28 | 3.14 | 23.59 |
| 03/10/2025 | 4.1 | 0.0 | 4.6 | 23.7 | 8.0 | 93 | 50 | 4.39 | 19.84 |
| 04/10/2025 | 3.0 | 1.4 | 3.8 | 22.8 | 13.4 | 96 | 59 | 5.19 | 10.79 |
| 05/10/2025 | 2.7 | 13.4 | 2.0 | 18.1 | 12.4 | 96 | 56 | 4.49 | 11.92 |
| 06/10/2025 | 4.4 | 0.0 | 2.2 | 21.6 | 6.8 | 92 | 39 | 4.25 | 23.98 |
| 07/10/2025 | 3.2 | 0.0 | 3.4 | 20.4 | 7.2 | 95 | 52 | 3.96 | 15.05 |
| 08/10/2025 | 4.2 | 0.2 | 2.2 | 21.0 | 6.8 | 97 | 41 | 4.54 | 21.65 |
| 09/10/2025 | 3.8 | 0.0 | 5.8 | 21.4 | 5.0 | 95 | 42 | 3.35 | 20.21 |
| 10/10/2025 | 4.5 | 0.0 | 5.0 | 22.2 | 9.8 | 87 | 38 | 3.79 | 22.13 |
| 11/10/2025 | 4.6 | 0.0 | 4.6 | 22.8 | 5.4 | 95 | 38 | 3.68 | 25.06 |
| 12/10/2025 | 5.1 | 0.0 | 4.6 | 26.6 | 7.6 | 96 | 36 | 3.32 | 25.20 |
| 13/10/2025 | 5.3 | 0.0 | 5.2 | 26.5 | 8.7 | 97 | 34 | 3.88 | 24.70 |
| 14/10/2025 | 4.9 | 0.0 | 5.6 | 25.3 | 9.3 | 96 | 47 | 4.06 | 25.48 |
| Totals: | 59.5 | 15.0 | 58.2 |
