Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 144 | 141 | 143 | 141 | 144 | 131 |
| Tmin | 118 | 117 | 119 | 116 | 119 | 118 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 186 | 169 | 184 | 180 | 185 | 175 |
| Humidity/Visibility | 107 | 106 | 112 | 107 | 108 | 106 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 143 | 152 | 156 | 158 | 154 | 138 |
| Tmin | 116 | 120 | 138 | 128 | 132 | 145 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 188 | 191 | 204 | 203 | 202 | 184 |
| Humidity/Visibility | 110 | 119 | 124 | 120 | 119 | 122 |
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. |
