Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1235 | 1120 | 1239 | 1194 | 1238 | 1198 |
| Tmin | 1266 | 1149 | 1268 | 1225 | 1271 | 1228 |
| Duration of sunshine | 217 | 254 | 248 | 270 | 310 | 270 |
| Precipitation | 186 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 176 | 159 | 175 | 169 | 173 | 168 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1236 | 1238 | 1227 | 1264 | 1225 | 1264 |
| Tmin | 1270 | 1272 | 1258 | 1296 | 1257 | 1274 |
| Duration of sunshine | 310 | 310 | 300 | 310 | 210 | 279 |
| Precipitation | 189 | 191 | 209 | 215 | 210 | 191 |
| Humidity/Visibility | 172 | 175 | 197 | 200 | 196 | 188 |
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. |
