Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 802 | 725 | 800 | 779 | 804 | 778 |
| Tmin | 802 | 725 | 803 | 778 | 806 | 779 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 39 | 35 | 36 | 66 | 61 | 62 |
| Humidity/Visibility | 21 | 19 | 20 | 43 | 43 | 41 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 803 | 806 | 794 | 835 | 804 | 827 |
| Tmin | 804 | 806 | 794 | 837 | 806 | 833 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 66 | 62 | 75 | 96 | 96 | 101 |
| Humidity/Visibility | 42 | 45 | 53 | 67 | 61 | 47 |
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. |
