Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1150 | 1072 | 1185 | 1150 | 1184 | 1146 |
| Tmin | 1166 | 1077 | 1196 | 1163 | 1187 | 1162 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 634 | 580 | 654 | 641 | 620 | 609 |
| Humidity/Visibility | 141 | 130 | 141 | 133 | 149 | 144 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1189 | 1181 | 1152 | 1206 | 1175 | 1161 |
| Tmin | 1185 | 1186 | 1159 | 1217 | 1182 | 1175 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 622 | 650 | 622 | 644 | 645 | 627 |
| Humidity/Visibility | 150 | 158 | 154 | 165 | 151 | 143 |
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. |
