Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 589 | 532 | 589 | 578 | 610 | 595 |
| Tmin | 558 | 504 | 558 | 540 | 558 | 542 |
| Duration of sunshine | 248 | 226 | 217 | 270 | 310 | 240 |
| Precipitation | 34 | 30 | 31 | 53 | 61 | 60 |
| Humidity/Visibility | 29 | 27 | 30 | 38 | 52 | 56 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 615 | 616 | 595 | 615 | 626 | 624 |
| Tmin | 560 | 558 | 541 | 558 | 540 | 558 |
| Duration of sunshine | 279 | 248 | 300 | 279 | 300 | 310 |
| Precipitation | 67 | 64 | 65 | 61 | 93 | 97 |
| Humidity/Visibility | 59 | 59 | 55 | 55 | 83 | 67 |
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. |
