Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 554 | 507 | 563 | 553 | 575 | 579 |
| Tmin | 572 | 507 | 573 | 552 | 573 | 581 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 439 | 396 | 438 | 430 | 447 | 450 |
| Humidity/Visibility | 49 | 48 | 52 | 45 | 52 | 69 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 608 | 589 | 561 | 580 | 560 | 580 |
| Tmin | 607 | 603 | 576 | 600 | 571 | 590 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 465 | 459 | 448 | 459 | 459 | 112 |
| Humidity/Visibility | 80 | 68 | 59 | 61 | 54 | 59 |
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. |
