Evapotranspiration Calculations
Portland 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 | 1.5 | 7.0 | | 14.7 | 8.6 | 99 | 79 | 4.61 | 12.23 |
| 02/09/2025 | 2.2 | 5.2 | | 15.4 | 6.1 | 100 | 58 | 7.01 | 10.74 |
| 03/09/2025 | 2.0 | 7.2 | | 14.6 | 9.6 | 99 | 65 | 8.17 | 11.91 |
| 04/09/2025 | 2.2 | 21.0 | | 12.1 | 8.2 | 99 | 55 | 6.95 | 14.90 |
| 05/09/2025 | 2.0 | 0.2 | | 13.4 | 2.2 | 99 | 53 | 3.25 | 15.74 |
| 06/09/2025 | 3.1 | 0.0 | | 20.4 | 3.8 | 90 | 44 | 4.77 | 11.20 |
| 07/09/2025 | 3.7 | 2.8 | | 20.9 | 8.6 | 99 | 43 | 8.16 | 10.70 |
| 08/09/2025 | 2.3 | 4.8 | | 15.6 | 12.0 | 97 | 69 | 8.44 | 15.50 |
| 09/09/2025 | 2.3 | 3.0 | | 13.4 | 9.1 | 97 | 54 | 4.08 | 16.66 |
| 10/09/2025 | 1.8 | 1.2 | | 14.0 | 6.0 | 99 | 72 | 3.27 | 14.34 |
| 11/09/2025 | | 1.4 | | | 8.8 | 90 | 65 | 5.00 | 14.08 |
| 12/09/2025 | | | | 14.5 | | 100 | 76 | 6.35 | 9.97 |
| 13/09/2025 | 2.0 | 2.0 | | 15.7 | 11.0 | 100 | 70 | 4.56 | 13.17 |
| 14/09/2025 | 4.3 | 0.2 | | 21.3 | 5.7 | 96 | 34 | 6.51 | 17.99 |
| 15/09/2025 | 5.7 | 0.0 | | 24.1 | 14.4 | 91 | 26 | 8.61 | 15.88 |
| 16/09/2025 | 2.7 | 4.4 | | 15.2 | 10.4 | 95 | 61 | 8.98 | 15.99 |
| 17/09/2025 | 3.0 | 16.0 | | 13.6 | 7.6 | 85 | 54 | 8.80 | 17.76 |
| 18/09/2025 | 3.4 | 0.2 | | 19.1 | 4.0 | 93 | 40 | 4.62 | 16.41 |
| 19/09/2025 | 3.0 | 0.0 | | 16.8 | 8.1 | 93 | 59 | 8.85 | 17.79 |
| 20/09/2025 | 2.7 | 5.2 | | 14.1 | 7.4 | 97 | 55 | 9.58 | 16.10 |
| Totals: | 49.9 | 81.8 | | | | | | | |
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