Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1260 | 1148 | 1265 | 1223 | 1268 | 1229 |
| Tmin | 1262 | 1145 | 1268 | 1225 | 1271 | 1229 |
| Duration of sunshine | 124 | 140 | 186 | 180 | 217 | 240 |
| Precipitation | 187 | 171 | 188 | 181 | 186 | 180 |
| Humidity/Visibility | 183 | 166 | 181 | 174 | 183 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1269 | 1263 | 1222 | 1257 | 1226 | 1266 |
| Tmin | 1268 | 1263 | 1227 | 1259 | 1229 | 1268 |
| Duration of sunshine | 155 | 124 | 150 | 279 | 180 | 186 |
| Precipitation | 186 | 190 | 211 | 215 | 210 | 223 |
| Humidity/Visibility | 181 | 182 | 201 | 203 | 206 | 210 |
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. |
