Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 635 | 574 | 643 | 626 | 647 | 634 |
| Tmin | 647 | 579 | 647 | 629 | 646 | 641 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 64 | 61 | 62 | 64 | 68 | 73 |
| Humidity/Visibility | 57 | 49 | 59 | 55 | 56 | 65 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 667 | 656 | 654 | 674 | 641 | 669 |
| Tmin | 664 | 658 | 647 | 670 | 644 | 674 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 105 | 100 | 103 | 97 | 92 | 101 |
| Humidity/Visibility | 78 | 71 | 77 | 78 | 71 | 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. |
