Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 134 | 121 | 130 | 119 | 129 | 125 |
| Tmin | 114 | 93 | 90 | 103 | 111 | 101 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 195 | 191 | 218 | 204 | 216 | 226 |
| Humidity/Visibility | 111 | 102 | 104 | 95 | 105 | 105 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 108 | 71 | 109 | 123 | 125 | 140 |
| Tmin | 111 | 84 | 106 | 126 | 127 | 134 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 234 | 214 | 237 | 269 | 265 | 301 |
| Humidity/Visibility | 101 | 74 | 112 | 126 | 121 | 128 |
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. |
