Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 67 | 65 | 74 | 109 | 105 | 111 |
| Tmin | 87 | 81 | 88 | 116 | 121 | 115 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 96 | 94 | 99 | 128 | 126 | 125 |
| Humidity/Visibility | 60 | 57 | 63 | 84 | 85 | 83 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 110 | 114 | 109 | 111 | 103 | 81 |
| Tmin | 117 | 123 | 118 | 118 | 105 | 115 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 132 | 129 | 120 | 123 | 128 | 129 |
| Humidity/Visibility | 84 | 87 | 85 | 84 | 79 | 77 |
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. |
