Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 81 | 79 | 81 | 82 | 87 | 96 |
| Tmin | 91 | 81 | 87 | 83 | 86 | 97 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 100 | 93 | 101 | 99 | 124 | 132 |
| Humidity/Visibility | 65 | 61 | 64 | 62 | 58 | 65 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 105 | 111 | 108 | 109 | 101 | 111 |
| Tmin | 116 | 114 | 116 | 116 | 107 | 119 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 151 | 152 | 132 | 125 | 130 | 129 |
| Humidity/Visibility | 76 | 77 | 81 | 84 | 79 | 86 |
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. |
