Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 669 | 600 | 669 | 645 | 674 | 673 |
| Tmin | 676 | 608 | 674 | 650 | 688 | 677 |
| Duration of sunshine | 93 | 113 | 31 | 90 | 93 | 150 |
| Precipitation | 68 | 58 | 66 | 67 | 84 | 92 |
| Humidity/Visibility | 57 | 51 | 57 | 53 | 65 | 80 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 693 | 672 | 664 | 678 | 655 | 688 |
| Tmin | 692 | 680 | 670 | 684 | 662 | 707 |
| Duration of sunshine | 155 | 155 | 150 | 93 | 60 | 124 |
| Precipitation | 101 | 99 | 103 | 98 | 99 | 99 |
| Humidity/Visibility | 82 | 67 | 70 | 61 | 67 | 82 |
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. |
