Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1455 | 1316 | 1457 | 1409 | 1471 | 1436 |
| Tmin | 1455 | 1317 | 1456 | 1409 | 1470 | 1436 |
| Duration of sunshine | 31 | 29 | 62 | 90 | 31 | 60 |
| Precipitation | 64 | 58 | 63 | 63 | 77 | 93 |
| Humidity/Visibility | 59 | 55 | 60 | 59 | 74 | 82 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1485 | 1482 | 1438 | 1481 | 1408 | 1486 |
| Tmin | 1482 | 1485 | 1436 | 1479 | 1406 | 1485 |
| Duration of sunshine | 31 | 0 | 30 | 31 | 30 | 31 |
| Precipitation | 100 | 97 | 93 | 92 | 94 | 94 |
| Humidity/Visibility | 90 | 89 | 82 | 80 | 55 | 89 |
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. |
