Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1483 | 1356 | 1505 | 1461 | 1506 | 1454 |
| Tmin | 1499 | 1367 | 1513 | 1465 | 1516 | 1459 |
| Duration of sunshine | 421 | 348 | 388 | 369 | 451 | 430 |
| Precipitation | 155 | 140 | 155 | 151 | 155 | 150 |
| Humidity/Visibility | 144 | 135 | 149 | 139 | 143 | 144 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1504 | 1531 | 1484 | 1534 | 1485 | 1505 |
| Tmin | 1509 | 1529 | 1485 | 1533 | 1487 | 1505 |
| Duration of sunshine | 442 | 467 | 460 | 426 | 404 | 436 |
| Precipitation | 160 | 188 | 182 | 186 | 178 | 163 |
| Humidity/Visibility | 140 | 157 | 167 | 165 | 149 | 147 |
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. |
