Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 681 | 625 | 679 | 649 | 674 | 674 |
| Tmin | 709 | 641 | 706 | 684 | 705 | 697 |
| Duration of sunshine | 60 | 63 | 58 | 48 | 56 | 71 |
| Precipitation | 101 | 97 | 101 | 99 | 98 | 109 |
| Humidity/Visibility | 60 | 56 | 57 | 55 | 61 | 69 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 690 | 703 | 681 | 702 | 680 | 706 |
| Tmin | 717 | 724 | 712 | 736 | 704 | 740 |
| Duration of sunshine | 69 | 83 | 79 | 86 | 79 | 88 |
| Precipitation | 132 | 129 | 123 | 130 | 133 | 128 |
| Humidity/Visibility | 76 | 83 | 80 | 77 | 76 | 83 |
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. |
