Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 676 | 615 | 679 | 655 | 678 | 652 |
| Tmin | 679 | 616 | 677 | 656 | 677 | 651 |
| Duration of sunshine | 300 | 335 | 264 | 376 | 329 | 315 |
| Precipitation | 124 | 113 | 124 | 122 | 128 | 119 |
| Humidity/Visibility | 120 | 111 | 120 | 114 | 117 | 113 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 679 | 675 | 657 | 674 | 653 | 676 |
| Tmin | 672 | 680 | 655 | 674 | 657 | 675 |
| Duration of sunshine | 331 | 335 | 382 | 357 | 325 | 325 |
| Precipitation | 127 | 127 | 122 | 122 | 122 | 124 |
| Humidity/Visibility | 119 | 118 | 115 | 114 | 116 | 119 |
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. |
