Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1254 | 1147 | 1268 | 1224 | 1268 | 1227 |
| Tmin | 1260 | 1149 | 1270 | 1228 | 1270 | 1227 |
| Duration of sunshine | 178 | 164 | 181 | 173 | 154 | 149 |
| Precipitation | 811 | 734 | 812 | 791 | 808 | 780 |
| Humidity/Visibility | 183 | 166 | 183 | 176 | 183 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1263 | 1266 | 1256 | 1295 | 1254 | 1297 |
| Tmin | 1268 | 1272 | 1257 | 1294 | 1256 | 1299 |
| Duration of sunshine | 142 | 149 | 170 | 177 | 202 | 209 |
| Precipitation | 808 | 814 | 814 | 839 | 813 | 841 |
| Humidity/Visibility | 183 | 183 | 205 | 209 | 205 | 214 |
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. |
