Evapotranspiration Calculations
St Helens Aerodrome - September 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) |
|---|---|---|---|---|---|---|---|---|---|
| 01/09/2026 | 2.4 | 0.0 | 17.3 | 6.9 | 94 | 55 | 5.62 | 9.84 | |
| 02/09/2026 | 2.7 | 0.0 | 16.2 | 9.8 | 84 | 49 | 4.88 | 13.83 | |
| 03/09/2026 | 3.4 | 0.2 | 16.3 | 11.8 | 84 | 34 | 6.06 | 14.29 | |
| 04/09/2026 | 2.5 | 0.0 | 15.6 | 6.1 | 82 | 45 | 4.11 | 12.97 | |
| 05/09/2026 | 1.7 | 0.6 | 16.5 | 10.7 | 97 | 64 | 4.17 | 6.26 | |
| 06/09/2026 | 2.4 | 3.8 | 16.9 | 8.5 | 88 | 54 | 3.87 | 13.30 | |
| 07/09/2026 | 2.4 | 0.0 | 14.3 | 9.0 | 93 | 43 | 3.68 | 14.96 | |
| 08/09/2026 | 3.0 | 0.0 | 18.1 | 3.5 | 96 | 36 | 3.94 | 15.71 | |
| 09/09/2026 | 3.3 | 0.0 | 16.5 | 8.0 | 75 | 31 | 4.36 | 15.64 | |
| 10/09/2026 | 3.2 | 0.0 | 22.2 | 3.5 | 91 | 32 | 2.87 | 16.07 | |
| 11/09/2026 | 3.1 | 0.0 | 19.1 | 3.7 | 92 | 18 | 2.66 | 16.33 | |
| 12/09/2026 | 2.2 | 0.0 | 17.3 | 5.6 | 96 | 61 | 2.97 | 16.40 | |
| 13/09/2026 | 2.7 | 0.0 | 20.5 | 6.2 | 87 | 48 | 3.21 | 12.92 | |
| 14/09/2026 | 3.4 | 0.0 | 19.7 | 11.5 | 80 | 53 | 5.57 | 15.87 | |
| 15/09/2026 | 3.3 | 0.0 | 17.1 | 8.5 | 86 | 31 | 4.34 | 14.10 | |
| Totals: | 41.7 | 4.6 |
