| Month/Grand Fork | Av. max temp | Av. min temp | Av. soil temp | Total solar radiation | Total PET | Rainfall |
| Apr-08 | 10.8 | −1.3 | 4.3 | 422 | 122.2 | 13.5 |
| May-08 | 19.1 | 3.0 | 12.2 | 488 | 199.6 | 22.6 |
| Jun-08 | 23.7 | 11.1 | 19.1 | 513 | 188.2 | 77.0 |
| Jul-08 | 26.8 | 13.6 | 23.4 | 538 | 184.9 | 91.2 |
| Aug-08 | 26.9 | 12.9 | 23.6 | 480 | 165.6 | 75.9 |
| Sep-08 | 21.2 | 7.9 | 16.4 | 308 | 98.8 | 97.0 |