Evapotranspiration Calculations
Perth Airport - 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 | 0.8 | | 21.3 | 8.0 | 94 | 38 | 3.20 | 18.98 |
| 02/10/2026 | 5.5 | 0.0 | | 23.8 | 10.3 | 75 | 31 | 5.20 | 23.51 |
| 03/10/2026 | 5.2 | 0.0 | | 25.9 | 8.5 | 92 | 27 | 3.69 | 23.44 |
| 04/10/2026 | 4.1 | 0.0 | | 21.9 | 8.0 | 98 | 44 | 3.39 | 23.51 |
| 05/10/2026 | 3.8 | 0.0 | | 23.5 | 7.8 | 97 | 46 | 3.31 | 19.34 |
| 06/10/2026 | 5.7 | 0.0 | | 29.1 | 8.9 | 95 | 31 | 3.99 | 22.95 |
| 07/10/2026 | 4.3 | 1.6 | | 22.5 | 13.9 | 92 | 54 | 5.55 | 22.74 |
| 08/10/2026 | 3.8 | 15.8 | | 19.6 | 15.2 | 96 | 45 | 7.31 | 14.24 |
| 09/10/2026 | 3.1 | 3.8 | | 19.2 | 10.6 | 96 | 53 | 4.75 | 14.11 |
| 10/10/2026 | 3.8 | 1.8 | | 21.0 | 12.0 | 98 | 47 | 3.67 | 20.20 |
| 11/10/2026 | 3.8 | 1.8 | | 19.7 | 12.0 | 95 | 39 | 3.96 | 18.73 |
| 12/10/2026 | 6.7 | 0.2 | | 23.3 | 9.9 | 66 | 26 | 7.47 | 25.26 |
| 13/10/2026 | 8.4 | 0.0 | | 28.0 | 11.5 | 63 | 22 | 8.18 | 25.47 |
| 14/10/2026 | 6.6 | 0.0 | | 30.6 | 16.7 | 91 | 23 | 5.39 | 18.70 |
| 15/10/2026 | 3.8 | 6.6 | | 22.1 | 16.5 | 97 | 51 | 4.24 | 17.64 |
| 16/10/2026 | 4.6 | 0.0 | | 23.6 | 9.7 | 96 | 44 | 3.22 | 25.95 |
| 17/10/2026 | 4.6 | 0.0 | | 24.2 | 9.4 | 96 | 42 | 3.29 | 24.58 |
| 18/10/2026 | 4.9 | 1.4 | | 21.6 | 14.7 | 96 | 35 | 5.90 | 22.74 |
| 19/10/2026 | 4.6 | 0.2 | | 22.5 | 10.3 | 95 | 39 | 3.62 | 23.98 |
| 20/10/2026 | 4.4 | 0.0 | | 22.1 | 6.9 | 96 | 46 | 3.25 | 26.38 |
| 21/10/2026 | 4.4 | 0.0 | | 23.9 | 9.3 | 94 | 48 | 5.05 | 20.16 |
| 22/10/2026 | 4.9 | 0.8 | | 22.1 | 15.2 | 93 | 41 | 5.94 | 22.44 |
| 23/10/2026 | 3.7 | 0.0 | | 19.4 | 10.2 | 88 | 45 | 5.10 | 15.65 |
| 24/10/2026 | 4.5 | 1.4 | | 18.9 | 4.0 | 89 | 29 | 5.25 | 20.86 |
| 25/10/2026 | 4.6 | 0.0 | | 20.1 | 3.6 | 95 | 36 | 4.46 | 26.36 |
| 26/10/2026 | 4.9 | 6.8 | | 23.4 | 10.7 | 98 | 30 | 3.75 | 22.55 |
| Totals: | 122.4 | 43.0 | | | | | | | |
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