Evapotranspiration Calculations
Portland 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 | 1.6 | 8.6 | | 16.3 | 13.2 | 99 | 79 | 2.25 | 8.86 |
| 02/10/2026 | 1.7 | 5.2 | | 15.3 | 8.8 | 99 | 75 | 5.07 | 9.66 |
| 03/10/2026 | 1.5 | 4.8 | | 14.6 | 11.9 | 98 | 81 | 6.71 | 8.88 |
| 04/10/2026 | 2.1 | 0.2 | | 14.0 | 7.7 | 94 | 66 | 2.16 | 14.71 |
| 05/10/2026 | 2.8 | 0.2 | | 16.1 | 6.2 | 94 | 60 | 3.29 | 20.33 |
| 06/10/2026 | 3.3 | 2.2 | | 16.1 | 9.8 | 94 | 55 | 6.71 | 20.34 |
| 07/10/2026 | 2.9 | 0.0 | | 15.4 | 4.9 | 90 | 60 | 3.55 | 21.38 |
| 08/10/2026 | 4.5 | 0.0 | | 23.9 | 5.2 | 95 | 37 | 3.63 | 22.95 |
| 09/10/2026 | 3.6 | 0.0 | | 21.4 | 10.3 | 96 | 43 | 5.75 | 10.93 |
| 10/10/2026 | 3.5 | 1.2 | | 18.7 | 11.1 | 92 | 62 | 8.55 | 19.91 |
| 11/10/2026 | 4.2 | 0.2 | | 24.1 | 11.1 | 96 | 45 | 4.75 | 18.00 |
| 12/10/2026 | 3.3 | 2.6 | | 15.3 | 11.4 | 96 | 53 | 8.31 | 20.33 |
| 13/10/2026 | 3.3 | 0.6 | | 13.6 | 9.8 | 78 | 50 | 6.37 | 16.71 |
| 14/10/2026 | 2.5 | 0.0 | | 13.8 | 8.8 | 83 | 54 | 3.62 | 13.00 |
| 15/10/2026 | 3.4 | 0.8 | | 17.1 | 9.1 | 95 | 59 | 4.09 | 23.96 |
| 16/10/2026 | 4.3 | 0.0 | | 23.2 | 5.6 | 97 | 33 | 3.10 | 21.47 |
| 17/10/2026 | 4.6 | 0.0 | | 25.3 | 9.9 | 97 | 40 | 3.25 | 23.02 |
| 18/10/2026 | 5.2 | 0.0 | | 27.0 | 8.7 | 88 | 37 | 3.36 | 24.42 |
| 19/10/2026 | 5.8 | 0.0 | | 27.4 | 16.6 | 64 | 44 | 4.74 | 21.55 |
| 20/10/2026 | 4.8 | 0.4 | | 26.2 | 17.1 | 98 | 47 | 5.02 | 20.64 |
| 21/10/2026 | 2.2 | 1.0 | | 16.9 | 12.3 | 99 | 83 | 3.12 | 14.78 |
| 22/10/2026 | 6.2 | 0.2 | | 31.0 | 12.2 | 100 | 29 | 3.96 | 24.06 |
| 23/10/2026 | 4.3 | 0.0 | | 27.0 | 15.5 | 95 | 40 | 4.36 | 13.43 |
| 24/10/2026 | 2.3 | 0.4 | | 18.6 | 8.2 | 99 | 71 | 2.04 | 14.09 |
| 25/10/2026 | 2.3 | 7.4 | | 14.6 | 10.2 | 98 | 58 | 4.41 | 11.81 |
| 26/10/2026 | 3.2 | 4.6 | | 15.0 | 8.0 | 84 | 56 | 5.54 | 19.30 |
| Totals: | 89.4 | 40.6 | | | | | | | |
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