Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 86 | 78 | 78 | 114 | 113 | 109 |
| Tmin | 84 | 78 | 80 | 114 | 117 | 114 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 102 | 92 | 108 | 131 | 131 | 126 |
| Humidity/Visibility | 64 | 59 | 61 | 84 | 84 | 83 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 107 | 112 | 103 | 103 | 103 | 109 |
| Tmin | 113 | 114 | 114 | 108 | 104 | 117 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 132 | 142 | 125 | 125 | 127 | 139 |
| Humidity/Visibility | 83 | 85 | 81 | 80 | 79 | 83 |
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. |
