Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 87 | 79 | 86 | 118 | 117 | 116 |
| Tmin | 92 | 82 | 90 | 117 | 118 | 115 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 95 | 94 | 94 | 127 | 125 | 125 |
| Humidity/Visibility | 67 | 60 | 66 | 87 | 89 | 86 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 113 | 121 | 113 | 113 | 110 | 115 |
| Tmin | 118 | 123 | 119 | 119 | 109 | 121 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 130 | 128 | 121 | 124 | 126 | 125 |
| Humidity/Visibility | 86 | 90 | 86 | 85 | 82 | 89 |
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. |
