Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1425 | 1289 | 1426 | 1373 | 1435 | 1403 |
| Tmin | 1426 | 1289 | 1425 | 1377 | 1437 | 1405 |
| Duration of sunshine | 93 | 29 | 62 | 90 | 93 | 90 |
| Precipitation | 62 | 58 | 63 | 62 | 79 | 97 |
| Humidity/Visibility | 60 | 56 | 60 | 55 | 71 | 81 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1456 | 1450 | 1409 | 1446 | 1376 | 1447 |
| Tmin | 1452 | 1451 | 1407 | 1445 | 1375 | 1453 |
| Duration of sunshine | 93 | 31 | 30 | 62 | 60 | 93 |
| Precipitation | 96 | 98 | 91 | 93 | 92 | 97 |
| Humidity/Visibility | 89 | 90 | 86 | 76 | 55 | 85 |
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. |
