Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 691 | 615 | 691 | 693 | 710 | 684 |
| Tmin | 691 | 620 | 688 | 690 | 718 | 692 |
| Duration of sunshine | 103 | 87 | 95 | 119 | 126 | 118 |
| Precipitation | 657 | 594 | 655 | 657 | 687 | 654 |
| Humidity/Visibility | 58 | 51 | 59 | 73 | 79 | 70 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 707 | 712 | 688 | 708 | 666 | 690 |
| Tmin | 700 | 708 | 695 | 712 | 664 | 689 |
| Duration of sunshine | 108 | 114 | 120 | 113 | 94 | 98 |
| Precipitation | 684 | 680 | 673 | 697 | 646 | 685 |
| Humidity/Visibility | 69 | 67 | 70 | 91 | 69 | 76 |
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. |
