Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 77 | 60 | 79 | 108 | 114 | 105 |
| Tmin | 82 | 80 | 87 | 116 | 120 | 109 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 101 | 93 | 99 | 130 | 129 | 125 |
| Humidity/Visibility | 63 | 55 | 63 | 84 | 87 | 81 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 98 | 115 | 110 | 108 | 102 | 111 |
| Tmin | 108 | 122 | 115 | 112 | 105 | 118 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 136 | 131 | 124 | 126 | 130 | 137 |
| Humidity/Visibility | 81 | 87 | 85 | 81 | 78 | 85 |
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. |
