Evapotranspiration Calculations
St Helens Aerodrome - October 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) |
|---|---|---|---|---|---|---|---|---|---|
| 01/10/2025 | 2.4 | 9.0 | 15.2 | 7.3 | 98 | 61 | 4.15 | 16.06 | |
| 02/10/2025 | 2.7 | 2.0 | 15.0 | 9.5 | 86 | 55 | 4.38 | 14.65 | |
| 03/10/2025 | 3.5 | 0.0 | 19.6 | 9.1 | 88 | 33 | 2.80 | 18.47 | |
| 04/10/2025 | 3.2 | 0.0 | 19.7 | 4.4 | 93 | 44 | 2.93 | 18.53 | |
| 05/10/2025 | 4.5 | 0.0 | 22.8 | 10.2 | 90 | 38 | 6.31 | 15.68 | |
| 06/10/2025 | 4.3 | 4.8 | 18.3 | 9.3 | 75 | 27 | 4.14 | 21.42 | |
| 07/10/2025 | 3.5 | 0.0 | 15.5 | 8.4 | 73 | 53 | 6.79 | 17.22 | |
| 08/10/2025 | 3.3 | 0.0 | 17.0 | 11.3 | 79 | 55 | 5.55 | 16.37 | |
| 09/10/2025 | 3.2 | 0.2 | 15.1 | 10.0 | 84 | 53 | 6.50 | 16.26 | |
| 10/10/2025 | 3.4 | 5.8 | 15.7 | 8.8 | 86 | 55 | 8.75 | 17.68 | |
| 11/10/2025 | 4.1 | 2.0 | 16.1 | 10.8 | 71 | 44 | 5.95 | 21.34 | |
| 12/10/2025 | 2.9 | 0.0 | 16.5 | 5.6 | 92 | 39 | 2.49 | 17.15 | |
| 13/10/2025 | 3.7 | 3.0 | 16.1 | 4.9 | 80 | 34 | 3.75 | 22.51 | |
| 14/10/2025 | 4.4 | 0.0 | 19.0 | 9.3 | 78 | 36 | 5.33 | 19.69 | |
| Totals: | 49.1 | 26.8 |
