Evapotranspiration Calculations
Portland Airport - December 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) |
| 01/12/2025 | 3.1 | 0.0 | | 15.0 | 9.0 | 89 | 64 | 7.23 | 19.08 |
| 02/12/2025 | 3.6 | 0.0 | | 16.8 | 8.0 | 86 | 63 | 5.01 | 23.99 |
| 03/12/2025 | 7.0 | 0.0 | | 25.9 | 7.2 | 94 | 27 | 5.77 | 31.50 |
| 04/12/2025 | 6.7 | 0.0 | | 26.4 | 15.8 | 97 | 34 | 6.02 | 29.38 |
| 05/12/2025 | 4.3 | 0.0 | | 18.8 | 6.9 | 100 | 63 | 2.85 | 31.63 |
| 06/12/2025 | 3.1 | 0.0 | | 16.7 | 8.9 | 100 | 58 | 7.77 | 16.57 |
| 07/12/2025 | 4.7 | 0.0 | | 16.3 | 8.7 | 72 | 52 | 6.31 | 29.61 |
| 08/12/2025 | 3.9 | 0.0 | | 20.4 | 10.4 | 100 | 54 | 7.70 | 19.04 |
| 09/12/2025 | | 0.0 | | | 8.1 | 99 | 47 | 3.98 | 29.95 |
| 10/12/2025 | | | | | | 93 | 60 | 3.28 | 24.33 |
| 11/12/2025 | | | | 18.8 | | 96 | 62 | 4.91 | 31.78 |
| 12/12/2025 | 5.9 | 0.0 | | 29.1 | 9.9 | 97 | 31 | 2.89 | 26.53 |
| 13/12/2025 | 4.2 | | | 18.6 | 12.4 | 98 | 62 | 4.56 | 28.36 |
| 14/12/2025 | 4.4 | 0.0 | | 16.8 | 12.3 | 90 | 49 | 9.50 | 24.20 |
| 15/12/2025 | 4.1 | 0.0 | | 16.3 | 10.6 | 69 | 51 | 4.35 | 21.84 |
| 16/12/2025 | 4.7 | 0.0 | | 19.1 | 11.4 | 95 | 58 | 3.47 | 31.64 |
| 17/12/2025 | 6.8 | 0.0 | | 30.1 | 8.2 | 100 | 24 | 2.90 | 31.40 |
| 18/12/2025 | 8.7 | 0.2 | | 34.4 | 13.9 | 75 | 13 | 4.12 | 28.38 |
| Totals: | 75.2 | 0.2 | | | | | | | |
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