Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 84 | 68 | 62 | 97 | 107 | 108 |
| Tmin | 84 | 66 | 71 | 99 | 116 | 105 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 103 | 111 | 111 | 119 | 134 | 140 |
| Humidity/Visibility | 64 | 51 | 54 | 74 | 83 | 79 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 96 | 111 | 103 | 108 | 95 | 99 |
| Tmin | 103 | 110 | 111 | 111 | 100 | 106 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 132 | 146 | 130 | 134 | 144 | 158 |
| Humidity/Visibility | 74 | 83 | 80 | 81 | 73 | 74 |
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. |
