Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 71 | 56 | 73 | 108 | 105 | 103 |
| Tmin | 79 | 82 | 84 | 113 | 120 | 108 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 106 | 95 | 101 | 134 | 132 | 127 |
| Humidity/Visibility | 60 | 54 | 61 | 83 | 86 | 80 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 95 | 108 | 107 | 106 | 101 | 101 |
| Tmin | 109 | 120 | 117 | 112 | 104 | 120 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 134 | 132 | 124 | 126 | 130 | 138 |
| Humidity/Visibility | 80 | 86 | 83 | 81 | 77 | 82 |
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. |
