Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1257 | 1135 | 1263 | 1226 | 1264 | 1225 |
| Tmin | 1260 | 1144 | 1264 | 1225 | 1268 | 1222 |
| Duration of sunshine | 6 | 11 | 3 | 6 | 8 | 5 |
| Precipitation | 190 | 180 | 195 | 186 | 186 | 182 |
| Humidity/Visibility | 176 | 154 | 177 | 173 | 177 | 173 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1267 | 1264 | 1247 | 1285 | 1249 | 1289 |
| Tmin | 1267 | 1267 | 1249 | 1293 | 1249 | 1295 |
| Duration of sunshine | 9 | 8 | 4 | 5 | 7 | 4 |
| Precipitation | 189 | 192 | 218 | 215 | 214 | 221 |
| Humidity/Visibility | 180 | 179 | 196 | 199 | 196 | 208 |
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. |
