Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1205 | 1111 | 1224 | 1218 | 1251 | 1207 |
| Tmin | 1209 | 1110 | 1226 | 1215 | 1250 | 1208 |
| Duration of sunshine | 357 | 347 | 328 | 365 | 411 | 394 |
| Precipitation | 686 | 617 | 688 | 693 | 713 | 695 |
| Humidity/Visibility | 116 | 107 | 116 | 140 | 144 | 136 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1259 | 1254 | 1198 | 1244 | 1208 | 1246 |
| Tmin | 1253 | 1257 | 1201 | 1239 | 1199 | 1239 |
| Duration of sunshine | 347 | 413 | 398 | 395 | 355 | 378 |
| Precipitation | 722 | 721 | 704 | 737 | 700 | 163 |
| Humidity/Visibility | 145 | 143 | 135 | 132 | 131 | 137 |
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. |
