Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 114 | 86 | 92 | 89 | 91 | 88 |
| Tmin | 117 | 88 | 89 | 83 | 91 | 87 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 124 | 96 | 126 | 142 | 155 | 149 |
| Humidity/Visibility | 114 | 91 | 108 | 120 | 139 | 138 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 92 | 88 | 85 | 84 | 85 | 91 |
| Tmin | 90 | 90 | 84 | 86 | 85 | 90 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 145 | 151 | 154 | 138 | 123 | 125 |
| Humidity/Visibility | 140 | 139 | 136 | 127 | 115 | 122 |
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. |
