Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 364 | 324 | 363 | 357 | 369 | 361 |
| Tmin | 370 | 327 | 369 | 359 | 368 | 371 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 64 | 59 | 62 | 62 | 67 | 73 |
| Humidity/Visibility | 56 | 50 | 58 | 56 | 57 | 67 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 395 | 382 | 382 | 395 | 371 | 391 |
| Tmin | 389 | 385 | 382 | 396 | 372 | 397 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 101 | 94 | 102 | 97 | 92 | 101 |
| Humidity/Visibility | 84 | 77 | 81 | 81 | 71 | 86 |
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. |
