Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 139 | 105 | 119 | 117 | 121 | 119 |
| Tmin | 137 | 111 | 118 | 116 | 122 | 118 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 159 | 140 | 160 | 151 | 156 | 150 |
| Humidity/Visibility | 144 | 125 | 143 | 138 | 144 | 139 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 118 | 119 | 117 | 114 | 110 | 125 |
| Tmin | 122 | 119 | 119 | 116 | 112 | 124 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 154 | 186 | 179 | 182 | 168 | 188 |
| Humidity/Visibility | 144 | 167 | 166 | 163 | 154 | 175 |
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. |
