Evapotranspiration Calculations
Rolleston Airport - 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 | 4.7 | 0.4 | | 32.3 | 21.4 | 97 | 36 | 1.97 | 17.76 |
| 02/01/2026 | 4.7 | 0.0 | | 31.4 | 22.3 | 98 | 44 | 2.12 | 18.80 |
| 03/01/2026 | 6.0 | 2.0 | | 32.8 | 18.0 | 100 | 32 | 2.20 | 25.88 |
| 04/01/2026 | 4.3 | 0.2 | | 31.5 | 18.5 | 88 | 36 | 1.63 | 16.59 |
| 05/01/2026 | 6.7 | 0.0 | | 34.4 | 22.4 | 90 | 33 | 2.35 | 27.28 |
| 06/01/2026 | 6.7 | 4.6 | | 34.6 | 19.6 | 99 | 28 | 2.47 | 27.40 |
| 07/01/2026 | 8.2 | 0.0 | | 34.8 | 19.8 | 87 | 27 | 4.05 | 30.50 |
| 08/01/2026 | 8.2 | 0.0 | | 35.0 | 19.8 | 80 | 28 | 4.24 | 29.03 |
| 09/01/2026 | 6.5 | 0.0 | | 32.1 | 18.3 | 85 | 36 | 3.59 | 24.88 |
| 10/01/2026 | 6.3 | 0.0 | | 33.5 | 18.3 | 84 | 40 | 3.55 | 22.27 |
| 11/01/2026 | 3.3 | 0.0 | | 30.3 | 24.5 | 100 | 62 | 4.35 | 10.10 |
| 12/01/2026 | 1.5 | 24.8 | | 25.8 | 22.2 | 100 | 87 | 4.65 | 5.19 |
| 13/01/2026 | 1.6 | 70.6 | | 27.6 | 22.2 | 100 | 98 | 3.51 | 8.21 |
| 14/01/2026 | 5.1 | 19.0 | | 31.8 | 22.3 | 100 | 61 | 3.28 | 21.92 |
| 15/01/2026 | 6.1 | 0.0 | | 33.2 | 23.3 | 96 | 39 | 1.88 | 26.60 |
| 16/01/2026 | 5.3 | 0.2 | | 33.4 | 24.2 | 99 | 44 | 2.21 | 21.16 |
| 17/01/2026 | 7.3 | 0.0 | | 37.5 | 23.5 | 100 | 36 | 2.00 | 30.50 |
| 18/01/2026 | 5.7 | 0.0 | | 35.6 | 25.6 | 92 | 42 | 1.37 | 23.53 |
| 19/01/2026 | 4.2 | 6.0 | | 31.8 | 22.6 | 100 | 52 | 2.33 | 16.37 |
| 20/01/2026 | 6.6 | 0.0 | | 33.3 | 22.2 | 100 | 35 | 2.21 | 29.21 |
| 21/01/2026 | 5.5 | 0.0 | | 33.3 | 20.9 | 93 | 42 | 1.73 | 24.13 |
| 22/01/2026 | 6.1 | 7.4 | | 33.1 | 22.6 | 100 | 45 | 2.47 | 26.08 |
| 23/01/2026 | 6.8 | 7.0 | | 34.9 | 22.2 | 100 | 38 | 1.99 | 29.80 |
| 24/01/2026 | 6.5 | 0.0 | | 34.1 | 21.3 | 95 | 31 | 1.53 | 30.14 |
| 25/01/2026 | 6.4 | 0.0 | | 35.5 | 21.1 | 93 | 29 | 1.42 | 28.59 |
| 26/01/2026 | 6.9 | 0.0 | | 36.1 | 21.7 | 87 | 34 | 1.84 | 29.94 |
| 27/01/2026 | 7.3 | 0.0 | | 36.7 | 22.8 | 94 | 35 | 2.45 | 29.91 |
| 28/01/2026 | 7.1 | 0.0 | | 35.4 | 23.8 | 90 | 39 | 2.33 | 29.75 |
| 29/01/2026 | 6.6 | 0.0 | | 34.5 | 24.1 | 89 | 25 | 2.72 | 24.36 |
| 30/01/2026 | 7.3 | 0.0 | | 34.2 | 19.8 | 76 | 28 | 3.00 | 28.89 |
| Totals: | 175.5 | 142.2 | | | | | | | |
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