Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 82 | 73 | 79 | 75 | 88 | 94 |
| Tmin | 79 | 73 | 81 | 74 | 82 | 92 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 98 | 91 | 97 | 98 | 94 | 107 |
| Humidity/Visibility | 88 | 79 | 88 | 86 | 89 | 98 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 114 | 117 | 117 | 101 | 102 | 106 |
| Tmin | 112 | 112 | 112 | 105 | 100 | 107 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 132 | 129 | 121 | 120 | 121 | 130 |
| Humidity/Visibility | 117 | 118 | 115 | 115 | 115 | 120 |
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. |
