Evapotranspiration Calculations
St Helens Aerodrome - August 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) |
| 01/08/2026 | 1.3 | 0.2 | | 15.2 | 3.0 | 96 | 53 | 2.62 | 9.66 |
| 02/08/2026 | 1.3 | 0.2 | | 15.7 | 4.2 | 98 | 50 | 2.14 | 9.80 |
| 03/08/2026 | 1.2 | 0.0 | | 14.1 | 4.2 | 98 | 61 | 2.70 | 7.41 |
| 04/08/2026 | 1.0 | 0.4 | | 13.4 | 3.3 | 97 | 58 | 1.86 | 8.94 |
| 05/08/2026 | 1.2 | 1.0 | | 15.1 | 4.4 | 97 | 64 | 2.76 | 9.68 |
| 06/08/2026 | 1.6 | 0.0 | | 16.3 | 4.3 | 94 | 43 | 2.65 | 9.43 |
| 07/08/2026 | 1.5 | 0.0 | | 15.1 | 4.1 | 97 | 53 | 3.07 | 10.62 |
| 08/08/2026 | 1.5 | 0.4 | | 15.5 | 4.2 | 98 | 54 | 3.15 | 10.51 |
| 09/08/2026 | 0.7 | 0.0 | | 13.3 | 4.6 | 97 | 87 | 1.74 | 5.93 |
| 10/08/2026 | 1.2 | 0.4 | | 13.5 | 6.8 | 97 | 63 | 3.41 | 5.28 |
| 11/08/2026 | 1.7 | 0.0 | | 15.8 | 7.1 | 88 | 48 | 2.83 | 11.21 |
| 12/08/2026 | 2.1 | 0.0 | | 16.3 | 8.5 | 85 | 45 | 3.90 | 9.02 |
| 13/08/2026 | 2.5 | 0.0 | | 19.2 | 7.0 | 79 | 41 | 3.66 | 11.17 |
| 14/08/2026 | 2.3 | 0.0 | | 18.5 | 10.2 | 89 | 44 | 3.62 | 10.82 |
| 15/08/2026 | 1.4 | 0.4 | | 13.5 | 7.7 | 94 | 52 | 2.06 | 10.57 |
| 16/08/2026 | 1.6 | 0.0 | | 15.3 | 4.2 | 97 | 56 | 2.95 | 11.77 |
| 17/08/2026 | 1.6 | 0.0 | | 15.8 | 4.0 | 97 | 57 | 3.02 | 11.46 |
| 18/08/2026 | 1.0 | 2.2 | | 15.1 | 6.5 | 98 | 81 | 3.07 | 7.13 |
| 19/08/2026 | 1.4 | 16.4 | | 16.8 | 11.1 | 95 | 71 | 3.31 | 8.13 |
| 20/08/2026 | 1.7 | 3.6 | | 17.1 | 12.0 | 96 | 64 | 4.02 | 7.90 |
| 21/08/2026 | 2.1 | 0.0 | | 16.7 | 8.7 | 87 | 56 | 4.42 | 11.01 |
| 22/08/2026 | 3.1 | 0.0 | | 17.6 | 10.4 | 80 | 31 | 4.48 | 12.73 |
| 23/08/2026 | 2.2 | 0.0 | | 16.4 | 2.5 | 95 | 46 | 3.84 | 12.84 |
| 24/08/2026 | 2.2 | 0.0 | | 17.5 | 7.7 | 85 | 57 | 4.44 | 9.33 |
| 25/08/2026 | 1.5 | 0.0 | | 16.1 | 9.7 | 94 | 66 | 2.45 | 8.97 |
| 26/08/2026 | 2.3 | 0.0 | | 17.2 | 6.0 | 89 | 41 | 2.99 | 12.73 |
| Totals: | 43.2 | 25.2 | | | | | | | |
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