Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1239 | 1144 | 1260 | 1220 | 1257 | 1227 |
| Tmin | 1252 | 1145 | 1267 | 1225 | 1266 | 1227 |
| Duration of sunshine | 82 | 68 | 86 | 81 | 86 | 79 |
| Precipitation | 746 | 675 | 745 | 727 | 746 | 722 |
| Humidity/Visibility | 181 | 165 | 184 | 175 | 183 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1264 | 1261 | 1244 | 1285 | 1245 | 1288 |
| Tmin | 1267 | 1267 | 1249 | 1290 | 1253 | 1294 |
| Duration of sunshine | 88 | 74 | 72 | 77 | 108 | 102 |
| Precipitation | 744 | 752 | 754 | 773 | 754 | 229 |
| Humidity/Visibility | 182 | 182 | 201 | 206 | 200 | 207 |
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. |
