Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 304 | 270 | 310 | 325 | 327 | 323 |
| Tmin | 328 | 299 | 331 | 348 | 359 | 347 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 152 | 138 | 177 | 179 | 185 | 175 |
| Humidity/Visibility | 74 | 68 | 85 | 94 | 97 | 92 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 325 | 327 | 323 | 326 | 281 | 298 |
| Tmin | 361 | 366 | 360 | 343 | 344 | 359 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 186 | 188 | 203 | 197 | 205 | 184 |
| Humidity/Visibility | 93 | 94 | 99 | 91 | 93 | 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. |
