Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 737 | 665 | 732 | 711 | 736 | 707 |
| Tmin | 620 | 561 | 622 | 600 | 621 | 602 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 560 | 509 | 560 | 542 | 560 | 542 |
| Humidity/Visibility | 114 | 106 | 115 | 112 | 116 | 110 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 730 | 734 | 710 | 732 | 712 | 736 |
| Tmin | 622 | 620 | 602 | 620 | 600 | 620 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 572 | 566 | 541 | 560 | 540 | 132 |
| Humidity/Visibility | 110 | 118 | 111 | 110 | 113 | 116 |
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. |
