Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 104 | 103 | 91 | 80 | 90 | 78 |
| Tmin | 0 | 0 | 0 | 1 | 0 | 0 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 130 | 110 | 127 | 108 | 96 | 104 |
| Humidity/Visibility | 101 | 94 | 89 | 75 | 84 | 74 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 83 | 86 | 75 | 68 | 76 | 58 |
| Tmin | 0 | 1 | 0 | 0 | 0 | 0 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 134 | 136 | 127 | 116 | 125 | 133 |
| Humidity/Visibility | 93 | 107 | 96 | 80 | 87 | 80 |
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. |
