Evapotranspiration Calculations
St Helens Aerodrome - April 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) |
| 01/04/2026 | 3.2 | 0.0 | | 26.0 | 11.1 | 96 | 43 | 3.13 | 11.56 |
| 02/04/2026 | 3.5 | 0.0 | | 23.1 | 11.3 | 92 | 36 | 3.61 | 15.47 |
| 03/04/2026 | 3.2 | 0.0 | | 18.7 | 12.3 | 74 | 26 | 3.12 | 14.34 |
| 04/04/2026 | 2.4 | 0.0 | | 17.1 | 6.5 | 87 | 40 | 2.35 | 15.33 |
| 05/04/2026 | 1.9 | 0.2 | | 17.8 | 9.5 | 95 | 58 | 2.28 | 10.91 |
| 06/04/2026 | 1.5 | 3.0 | | 17.9 | 11.8 | 96 | 66 | 1.34 | 8.76 |
| 07/04/2026 | 2.5 | 5.4 | | 24.3 | 13.4 | 96 | 43 | 1.78 | 12.44 |
| 08/04/2026 | 2.2 | 2.8 | | 17.3 | 10.4 | 89 | 43 | 2.52 | 11.68 |
| 09/04/2026 | 1.8 | 0.2 | | 20.3 | 10.2 | 93 | 73 | 3.91 | 7.97 |
| 10/04/2026 | 2.3 | 0.0 | | 14.6 | 11.7 | 89 | 54 | 5.21 | 10.09 |
| 11/04/2026 | 2.7 | 4.4 | | 15.6 | 7.8 | 73 | 52 | 5.14 | 13.08 |
| 12/04/2026 | 2.6 | 0.6 | | 16.8 | 6.6 | 78 | 36 | 3.28 | 12.63 |
| 13/04/2026 | 2.8 | 0.0 | | 22.2 | 8.6 | 80 | 30 | 2.47 | 12.37 |
| 14/04/2026 | 2.7 | 0.0 | | 20.9 | 4.9 | 94 | 46 | 3.56 | 13.47 |
| 15/04/2026 | 2.5 | 0.0 | | 18.6 | 7.5 | 85 | 36 | 2.67 | 13.28 |
| 16/04/2026 | 2.4 | 0.0 | | 18.9 | 6.3 | 89 | 49 | 4.37 | 7.67 |
| 17/04/2026 | 3.3 | 0.0 | | 19.0 | 9.3 | 59 | 31 | 3.88 | 12.75 |
| 18/04/2026 | 2.4 | 0.0 | | 16.0 | 5.7 | 77 | 41 | 3.58 | 11.18 |
| 19/04/2026 | 2.2 | 0.0 | | 17.3 | 4.3 | 90 | 44 | 3.10 | 11.90 |
| 20/04/2026 | 2.0 | 0.0 | | 19.2 | 5.7 | 97 | 53 | 2.87 | 10.79 |
| 21/04/2026 | 1.8 | 0.0 | | 18.4 | 9.3 | 95 | 55 | 2.88 | 8.94 |
| 22/04/2026 | 1.8 | 0.2 | | 18.5 | 12.5 | 89 | 64 | 3.34 | 9.10 |
| 23/04/2026 | 2.6 | 0.0 | | 23.8 | 10.7 | 94 | 40 | 2.95 | 11.90 |
| 24/04/2026 | 2.6 | 0.0 | | 23.7 | 11.6 | 91 | 39 | 2.90 | 11.59 |
| 25/04/2026 | 2.9 | 0.0 | | 23.4 | 11.8 | 81 | 42 | 3.53 | 11.38 |
| 26/04/2026 | 2.8 | 0.0 | | 24.4 | 11.0 | 86 | 38 | 3.13 | 9.96 |
| Totals: | 64.6 | 16.8 | | | | | | | |
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