Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 541 | 488 | 544 | 532 | 533 | 532 |
| Tmin | 544 | 494 | 539 | 523 | 530 | 527 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 138 | 122 | 138 | 141 | 135 | 134 |
| Humidity/Visibility | 115 | 106 | 117 | 111 | 107 | 111 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 547 | 574 | 560 | 570 | 564 | 569 |
| Tmin | 545 | 564 | 554 | 557 | 556 | 562 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 138 | 172 | 163 | 174 | 167 | 175 |
| Humidity/Visibility | 116 | 141 | 140 | 132 | 138 | 141 |
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. |
