Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1176 | 1063 | 1175 | 1135 | 1175 | 1136 |
| Tmin | 1176 | 1063 | 1173 | 1136 | 1177 | 1138 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 128 | 114 | 124 | 122 | 124 | 120 |
| Humidity/Visibility | 120 | 110 | 121 | 114 | 119 | 116 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1171 | 1173 | 1136 | 1170 | 1138 | 1176 |
| Tmin | 1174 | 1172 | 1134 | 1172 | 1137 | 1176 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 127 | 128 | 120 | 122 | 121 | 124 |
| Humidity/Visibility | 120 | 121 | 116 | 116 | 118 | 123 |
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. |
