Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 707 | 637 | 704 | 682 | 706 | 682 |
| Tmin | 561 | 504 | 561 | 541 | 561 | 542 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 155 | 142 | 157 | 153 | 155 | 150 |
| Humidity/Visibility | 134 | 120 | 131 | 127 | 134 | 127 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 708 | 704 | 681 | 694 | 655 | 676 |
| Tmin | 562 | 561 | 551 | 569 | 542 | 561 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 158 | 156 | 148 | 143 | 120 | 124 |
| Humidity/Visibility | 133 | 132 | 126 | 122 | 112 | 120 |
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. |
