Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 84 | 78 | 77 | 95 | 111 | 111 |
| Tmin | 87 | 79 | 87 | 98 | 121 | 111 |
| Duration of sunshine | 84 | 75 | 79 | 76 | 84 | 81 |
| Precipitation | 103 | 97 | 97 | 121 | 126 | 126 |
| Humidity/Visibility | 64 | 58 | 63 | 72 | 86 | 83 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 94 | 105 | 108 | 114 | 97 | 107 |
| Tmin | 107 | 111 | 117 | 117 | 106 | 115 |
| Duration of sunshine | 81 | 104 | 108 | 113 | 97 | 104 |
| Precipitation | 131 | 129 | 120 | 129 | 126 | 147 |
| Humidity/Visibility | 75 | 81 | 85 | 83 | 77 | 79 |
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. |
