Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 122 | 106 | 137 | 134 | 136 | 137 |
| Tmin | 115 | 96 | 128 | 147 | 152 | 148 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 128 | 112 | 148 | 151 | 155 | 150 |
| Humidity/Visibility | 71 | 61 | 85 | 83 | 84 | 82 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 131 | 129 | 139 | 139 | 148 | 126 |
| Tmin | 147 | 141 | 149 | 144 | 140 | 123 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 157 | 155 | 150 | 153 | 150 | 132 |
| Humidity/Visibility | 79 | 78 | 82 | 82 | 85 | 74 |
Climate data is usually derived from meteorological data of a certain number of years. The actual number of recorded years may vary from only a couple to 50 years or more. The quality of climate data depends on the number of available recorded years. Fewer years means less reliable data. The standart-period for reliable climate data is 30 years. For example, the mean monthly temperature for, let's say January, would ideally calculated from a total number of 930 recorded January-days. However, the usual number of recorded days is much smaller. The table above shows the actual number of recorded days for every parameter measured. |
