Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 97 | 92 | 97 | 98 | 114 | 106 |
| Tmin | 98 | 85 | 100 | 101 | 118 | 111 |
| Duration of sunshine | 124 | 170 | 124 | 120 | 124 | 60 |
| Precipitation | 174 | 162 | 174 | 188 | 198 | 186 |
| Humidity/Visibility | 94 | 87 | 96 | 96 | 109 | 108 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 129 | 107 | 94 | 83 | 85 | 113 |
| Tmin | 126 | 107 | 92 | 81 | 84 | 104 |
| Duration of sunshine | 124 | 124 | 210 | 155 | 60 | 124 |
| Precipitation | 195 | 188 | 186 | 191 | 204 | 219 |
| Humidity/Visibility | 123 | 104 | 89 | 83 | 84 | 106 |
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. |
