Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 49 | 46 | 56 | 71 | 80 | 71 |
| Tmin | 38 | 37 | 49 | 65 | 73 | 66 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 116 | 111 | 134 | 148 | 154 | 147 |
| Humidity/Visibility | 27 | 26 | 34 | 43 | 45 | 38 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 70 | 72 | 40 | 41 | 45 | 44 |
| Tmin | 49 | 56 | 37 | 39 | 33 | 43 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 151 | 156 | 139 | 141 | 148 | 154 |
| Humidity/Visibility | 38 | 39 | 21 | 23 | 27 | 30 |
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. |
