Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1265 | 1150 | 1267 | 1228 | 1266 | 1223 |
| Tmin | 1236 | 1121 | 1239 | 1199 | 1237 | 1196 |
| Duration of sunshine | 217 | 197 | 217 | 240 | 217 | 270 |
| Precipitation | 837 | 757 | 837 | 810 | 838 | 809 |
| Humidity/Visibility | 166 | 152 | 165 | 159 | 162 | 157 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1262 | 1268 | 1253 | 1297 | 1258 | 1271 |
| Tmin | 1238 | 1241 | 1225 | 1268 | 1227 | 1271 |
| Duration of sunshine | 155 | 248 | 240 | 248 | 180 | 248 |
| Precipitation | 838 | 840 | 840 | 866 | 842 | 842 |
| Humidity/Visibility | 163 | 165 | 185 | 188 | 187 | 184 |
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. |
