Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 267 | 237 | 260 | 254 | 265 | 258 |
| Tmin | 222 | 196 | 220 | 211 | 218 | 211 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 126 | 115 | 124 | 123 | 131 | 121 |
| Humidity/Visibility | 111 | 101 | 105 | 104 | 110 | 109 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 268 | 260 | 260 | 264 | 254 | 267 |
| Tmin | 220 | 221 | 213 | 217 | 210 | 217 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 132 | 134 | 128 | 118 | 118 | 131 |
| Humidity/Visibility | 111 | 110 | 109 | 106 | 106 | 115 |
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. |
