Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1258 | 1145 | 1265 | 1225 | 1264 | 1222 |
| Tmin | 1234 | 1121 | 1238 | 1195 | 1231 | 1194 |
| Duration of sunshine | 299 | 325 | 362 | 385 | 363 | 354 |
| Precipitation | 186 | 169 | 186 | 180 | 186 | 179 |
| Humidity/Visibility | 166 | 153 | 167 | 159 | 165 | 159 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1260 | 1271 | 1250 | 1293 | 1251 | 1270 |
| Tmin | 1233 | 1229 | 1218 | 1264 | 1221 | 1265 |
| Duration of sunshine | 369 | 454 | 416 | 447 | 376 | 359 |
| Precipitation | 187 | 189 | 210 | 215 | 212 | 190 |
| Humidity/Visibility | 164 | 164 | 191 | 192 | 186 | 184 |
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. |
