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Meteorological factors between February and May (1999-2008)
| Average temperature (°C) | Maximum temperature (°C) | Minimum temperature (°C) | Relative humidity (%) | Precipitation (mm) | ||||||
| Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | |
| February | 0.1 | 1.7 | 5.2 | 2.1 | -4.6 | 1.7 | 58.6 | 6.5 | 0.6 | 0.5 |
| March | 5.6 | 0.7 | 11.1 | 0.9 | 0.5 | 0.7 | 58.9 | 7.0 | 1.2 | 1.3 |
| April | 12.2 | 0.7 | 18.1 | 1.1 | 6.8 | 0.5 | 59.0 | 4.9 | 2.6 | 1.8 |
| May | 17.4 | 0.7 | 23.1 | 0.7 | 12.4 | 0.6 | 64.8 | 4.8 | 3.2 | 1.0 |
