Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 558 | 504 | 558 | 540 | 558 | 540 |
| Tmin | 558 | 504 | 558 | 540 | 558 | 540 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 73 | 72 | 85 | 92 | 107 | 120 |
| Humidity/Visibility | 29 | 26 | 59 | 89 | 106 | 119 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 558 | 558 | 540 | 558 | 540 | 558 |
| Tmin | 558 | 558 | 540 | 558 | 540 | 558 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 118 | 104 | 117 | 64 | 90 | 66 |
| Humidity/Visibility | 113 | 99 | 114 | 30 | 0 | 29 |
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. |
