Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1255 | 1144 | 1267 | 1223 | 1260 | 1226 |
| Tmin | 1258 | 1147 | 1270 | 1224 | 1267 | 1228 |
| Duration of sunshine | 270 | 239 | 300 | 282 | 307 | 292 |
| Precipitation | 840 | 760 | 838 | 817 | 839 | 810 |
| Humidity/Visibility | 181 | 165 | 184 | 177 | 183 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1262 | 1269 | 1254 | 1289 | 1249 | 1294 |
| Tmin | 1269 | 1270 | 1253 | 1292 | 1254 | 1299 |
| Duration of sunshine | 300 | 301 | 316 | 290 | 313 | 327 |
| Precipitation | 837 | 847 | 846 | 870 | 842 | 221 |
| Humidity/Visibility | 182 | 184 | 205 | 209 | 205 | 211 |
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. |
