Evapotranspiration Calculations
Perth Metro - October 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) |
| 01/10/2026 | 3.7 | 0.0 | | 20.9 | 10.0 | 90 | 38 | 2.27 | 21.03 |
| 02/10/2026 | 4.6 | 0.0 | | 24.1 | 7.8 | 92 | 28 | 2.77 | 23.69 |
| 03/10/2026 | 4.5 | 0.0 | | 25.4 | 8.1 | 95 | 30 | 2.38 | 23.85 |
| 04/10/2026 | 3.9 | 0.0 | | 21.9 | 11.1 | 99 | 48 | 2.55 | 23.60 |
| 05/10/2026 | 3.4 | 0.0 | | 22.8 | 9.6 | 99 | 50 | 1.89 | 19.82 |
| 06/10/2026 | 4.5 | 0.0 | | 28.2 | 10.2 | 99 | 33 | 2.07 | 22.39 |
| 07/10/2026 | 3.8 | 0.0 | | 22.4 | 13.2 | 99 | 52 | 2.95 | 20.93 |
| 08/10/2026 | 3.4 | 9.6 | | 19.7 | 15.6 | 98 | 49 | 4.16 | 16.72 |
| 09/10/2026 | 3.0 | 2.0 | | 19.5 | 13.3 | 99 | 55 | 2.91 | 15.81 |
| 10/10/2026 | 3.8 | 2.6 | | 21.2 | 12.4 | 99 | 46 | 2.52 | 22.19 |
| 11/10/2026 | 3.7 | 0.8 | | 19.2 | 12.5 | 94 | 37 | 3.00 | 19.74 |
| 12/10/2026 | 5.1 | 0.2 | | 23.7 | 9.8 | 68 | 26 | 2.90 | 25.29 |
| 13/10/2026 | 5.9 | 0.0 | | 28.3 | 11.4 | 64 | 21 | 2.94 | 25.53 |
| 14/10/2026 | 5.8 | 0.0 | | 30.3 | 15.6 | 89 | 21 | 3.84 | 18.22 |
| 15/10/2026 | 3.4 | 6.0 | | 21.4 | 16.4 | 99 | 52 | 2.50 | 17.86 |
| 16/10/2026 | 4.2 | 0.4 | | 23.2 | 9.7 | 98 | 47 | 1.60 | 26.00 |
| 17/10/2026 | 4.2 | 0.0 | | 24.1 | 11.2 | 99 | 41 | 1.91 | 24.08 |
| 18/10/2026 | 4.2 | 1.4 | | 20.8 | 15.2 | 99 | 38 | 3.43 | 22.33 |
| 19/10/2026 | 4.2 | 0.2 | | 22.0 | 12.0 | 91 | 41 | 2.20 | 23.83 |
| 20/10/2026 | 4.1 | 0.0 | | 21.5 | 8.7 | 98 | 47 | 1.76 | 26.15 |
| 21/10/2026 | 3.9 | 0.0 | | 23.5 | 11.1 | 95 | 49 | 2.35 | 20.88 |
| 22/10/2026 | 4.4 | 0.8 | | 21.2 | 16.0 | 96 | 41 | 3.71 | 23.15 |
| 23/10/2026 | 4.2 | 0.0 | | 18.4 | 14.7 | 83 | 48 | 4.01 | 23.27 |
| 24/10/2026 | 4.3 | 1.0 | | 18.1 | 6.4 | 80 | 38 | 3.32 | 26.45 |
| 25/10/2026 | 4.1 | 0.2 | | 19.2 | 4.8 | 96 | 38 | 2.57 | 26.84 |
| 26/10/2026 | 4.3 | 7.2 | | 22.9 | 11.6 | 99 | 31 | 2.11 | 23.52 |
| Totals: | 108.6 | 32.4 | | | | | | | |
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