Evapotranspiration Calculations
St Helens Aerodrome - January 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) |
|---|---|---|---|---|---|---|---|---|---|
| 01/01/2026 | 4.8 | 0.0 | 20.0 | 10.2 | 88 | 51 | 2.49 | 30.10 | |
| 02/01/2026 | 3.7 | 0.0 | 20.9 | 14.0 | 83 | 61 | 3.09 | 18.68 | |
| 03/01/2026 | 4.5 | 0.0 | 22.1 | 15.3 | 88 | 57 | 3.28 | 23.85 | |
| 04/01/2026 | 4.2 | 0.0 | 20.4 | 14.4 | 93 | 62 | 4.71 | 24.84 | |
| 05/01/2026 | 5.6 | 0.0 | 27.6 | 11.1 | 94 | 43 | 2.54 | 28.65 | |
| 06/01/2026 | 6.6 | 0.0 | 29.7 | 13.7 | 92 | 29 | 3.28 | 28.88 | |
| 07/01/2026 | 8.0 | 0.0 | 33.6 | 13.8 | 92 | 22 | 3.69 | 30.98 | |
| 08/01/2026 | 4.1 | 0.0 | 21.1 | 18.4 | 87 | 39 | 3.27 | 16.73 | |
| 09/01/2026 | 2.4 | 0.2 | 23.4 | 15.9 | 93 | 62 | 2.96 | 7.23 | |
| 10/01/2026 | 5.8 | 2.2 | 22.7 | 16.5 | 79 | 44 | 6.11 | 26.30 | |
| 11/01/2026 | 5.6 | 0.0 | 20.0 | 10.5 | 84 | 29 | 4.04 | 31.12 | |
| 12/01/2026 | 5.4 | 0.0 | 22.0 | 9.4 | 89 | 41 | 4.24 | 30.86 | |
| 13/01/2026 | 4.6 | 0.0 | 21.2 | 10.3 | 94 | 58 | 3.10 | 29.59 | |
| 14/01/2026 | 2.3 | 1.0 | 18.5 | 14.0 | 96 | 78 | 3.18 | 12.22 | |
| 15/01/2026 | 3.5 | 4.0 | 20.8 | 15.1 | 87 | 61 | 3.74 | 16.33 | |
| 16/01/2026 | 3.1 | 6.0 | 19.4 | 12.7 | 95 | 53 | 4.15 | 13.25 | |
| 17/01/2026 | 3.2 | 0.2 | 18.4 | 13.9 | 77 | 55 | 3.99 | 12.06 | |
| 18/01/2026 | 3.8 | 0.2 | 20.4 | 13.7 | 84 | 57 | 5.26 | 16.27 | |
| 19/01/2026 | 0.8 | 14.3 | 94 | 68 | 4.14 | 16.73 | |||
| 20/01/2026 | 3.8 | 21.4 | 14.7 | 91 | 62 | 3.33 | 20.25 | ||
| 21/01/2026 | 4.8 | 0.0 | 26.3 | 12.2 | 95 | 45 | 3.64 | 21.68 | |
| 22/01/2026 | 4.3 | 15.6 | 18.6 | 9.9 | 91 | 43 | 4.26 | 23.93 | |
| 23/01/2026 | 2.8 | 0.2 | 17.3 | 10.9 | 85 | 52 | 2.64 | 13.20 | |
| 24/01/2026 | 4.6 | 0.0 | 20.7 | 13.8 | 86 | 52 | 3.96 | 25.44 | |
| 25/01/2026 | 4.6 | 0.0 | 20.8 | 15.7 | 90 | 58 | 5.19 | 25.84 | |
| 26/01/2026 | 4.5 | 0.0 | 20.2 | 10.4 | 91 | 54 | 2.77 | 29.23 | |
| 27/01/2026 | 4.5 | 0.0 | 22.3 | 10.9 | 93 | 58 | 4.54 | 26.37 | |
| 28/01/2026 | 3.2 | 0.0 | 22.6 | 15.3 | 94 | 65 | 3.30 | 15.70 | |
| 29/01/2026 | 3.4 | 0.0 | 21.5 | 15.3 | 85 | 56 | 2.94 | 15.26 | |
| 30/01/2026 | 4.5 | 0.0 | 23.5 | 11.7 | 95 | 58 | 3.48 | 25.40 | |
| Totals: | 126.2 | 30.4 |
