Evapotranspiration Calculations
St Helens Aerodrome - 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 | 3.7 | 8.8 | | 17.2 | 6.7 | 97 | 55 | 2.32 | 25.07 |
| 02/12/2025 | 3.9 | 0.2 | | 18.8 | 6.6 | 94 | 48 | 2.84 | 24.25 |
| 03/12/2025 | 5.5 | 0.0 | | 22.6 | 11.6 | 77 | 47 | 5.57 | 26.98 |
| 04/12/2025 | 8.0 | 0.0 | | 27.3 | 14.2 | 80 | 19 | 5.83 | 31.30 |
| 05/12/2025 | 6.0 | 0.0 | | 21.8 | 11.3 | 83 | 23 | 3.73 | 31.30 |
| 06/12/2025 | 5.7 | 0.0 | | 21.1 | 11.8 | 74 | 30 | 4.93 | 26.01 |
| 07/12/2025 | 5.1 | 0.0 | | 20.3 | 7.1 | 75 | 34 | 4.08 | 26.52 |
| 08/12/2025 | 3.2 | 0.0 | | 18.2 | 12.3 | 86 | 61 | 5.94 | 13.56 |
| 09/12/2025 | 6.6 | 0.2 | | 23.9 | 12.1 | 87 | 19 | 4.17 | 31.68 |
| 10/12/2025 | 4.9 | 0.0 | | 20.1 | 9.5 | 84 | 47 | 3.27 | 29.64 |
| 11/12/2025 | 4.8 | 0.0 | | 17.8 | 9.3 | 80 | 46 | 2.82 | 31.16 |
| 12/12/2025 | 4.6 | 0.0 | | 20.8 | 8.6 | 93 | 56 | 4.58 | 28.61 |
| 13/12/2025 | 5.9 | 0.0 | | 26.1 | 16.1 | 95 | 35 | 3.05 | 28.96 |
| 14/12/2025 | 6.6 | 0.0 | | 19.9 | 14.3 | 71 | 21 | 6.19 | 30.53 |
| 15/12/2025 | 5.5 | 0.0 | | 21.1 | 6.7 | 71 | 24 | 2.89 | 30.35 |
| 16/12/2025 | 6.0 | 0.0 | | 25.5 | 8.6 | 74 | 40 | 3.24 | 31.35 |
| 17/12/2025 | 6.9 | 0.0 | | 29.5 | 11.2 | 93 | 22 | 3.27 | 30.22 |
| 18/12/2025 | 3.5 | 0.0 | | 24.2 | 12.6 | 84 | 41 | 2.35 | 12.48 |
| Totals: | 96.4 | 9.2 | | | | | | | |
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