Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 698 | 617 | 673 | 667 | 704 | 679 |
| Tmin | 690 | 612 | 665 | 651 | 692 | 660 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 125 | 112 | 145 | 175 | 179 | 180 |
| Humidity/Visibility | 108 | 91 | 101 | 108 | 135 | 126 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 702 | 689 | 679 | 685 | 669 | 687 |
| Tmin | 689 | 687 | 674 | 678 | 664 | 680 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 172 | 167 | 159 | 169 | 153 | 143 |
| Humidity/Visibility | 127 | 118 | 113 | 104 | 100 | 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. |
