Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 618 | 570 | 627 | 618 | 640 | 623 |
| Tmin | 623 | 574 | 640 | 623 | 644 | 628 |
| Duration of sunshine | 89 | 95 | 106 | 111 | 118 | 117 |
| Precipitation | 130 | 112 | 124 | 123 | 128 | 129 |
| Humidity/Visibility | 94 | 95 | 106 | 107 | 113 | 110 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 643 | 647 | 608 | 628 | 617 | 630 |
| Tmin | 640 | 645 | 611 | 635 | 618 | 629 |
| Duration of sunshine | 107 | 115 | 100 | 105 | 107 | 103 |
| Precipitation | 131 | 129 | 126 | 128 | 132 | 145 |
| Humidity/Visibility | 113 | 114 | 98 | 97 | 107 | 102 |
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. |
