Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 83 | 70 | 82 | 84 | 102 | 98 |
| Tmin | 90 | 81 | 89 | 98 | 114 | 109 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 95 | 87 | 99 | 107 | 120 | 130 |
| Humidity/Visibility | 84 | 75 | 84 | 90 | 107 | 108 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 110 | 107 | 106 | 101 | 101 | 102 |
| Tmin | 113 | 106 | 109 | 112 | 106 | 113 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 131 | 135 | 127 | 129 | 124 | 136 |
| Humidity/Visibility | 111 | 102 | 107 | 106 | 97 | 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. |
