Evapotranspiration Calculations
Perth Airport - January 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) |
|---|---|---|---|---|---|---|---|---|---|
| 01/01/2026 | 11.6 | 0.0 | 13.0 | 38.4 | 15.5 | 68 | 8 | 5.90 | 30.44 |
| 02/01/2026 | 12.2 | 0.0 | 11.8 | 40.3 | 21.8 | 51 | 13 | 6.05 | 30.42 |
| 03/01/2026 | 9.3 | 0.0 | 13.2 | 35.5 | 21.7 | 75 | 24 | 4.81 | 31.54 |
| 04/01/2026 | 9.2 | 0.0 | 11.4 | 34.7 | 20.5 | 76 | 21 | 4.77 | 31.46 |
| 05/01/2026 | 9.1 | 0.0 | 10.4 | 35.4 | 17.6 | 85 | 25 | 4.94 | 31.46 |
| 06/01/2026 | 8.5 | 0.0 | 9.4 | 32.4 | 18.2 | 80 | 33 | 5.67 | 31.37 |
| 07/01/2026 | 9.1 | 0.0 | 8.8 | 32.1 | 18.1 | 63 | 30 | 6.30 | 31.23 |
| 08/01/2026 | 7.4 | 0.0 | 8.6 | 29.6 | 17.0 | 64 | 35 | 6.14 | 22.66 |
| 09/01/2026 | 8.4 | 0.0 | 8.0 | 29.5 | 16.0 | 69 | 19 | 6.42 | 24.89 |
| Totals: | 84.8 | 0.0 | 94.6 |
