Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 335 | 308 | 339 | 328 | 334 | 341 |
| Tmin | 341 | 309 | 339 | 329 | 341 | 342 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 341 | 313 | 343 | 333 | 346 | 346 |
| Humidity/Visibility | 44 | 41 | 45 | 44 | 43 | 52 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 361 | 368 | 354 | 362 | 351 | 362 |
| Tmin | 366 | 372 | 357 | 365 | 350 | 367 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 380 | 376 | 362 | 370 | 366 | 131 |
| Humidity/Visibility | 62 | 67 | 64 | 62 | 60 | 65 |
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. |
