Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 701 | 632 | 706 | 658 | 677 | 655 |
| Tmin | 705 | 637 | 703 | 657 | 678 | 658 |
| Duration of sunshine | 66 | 70 | 81 | 78 | 84 | 84 |
| Precipitation | 124 | 112 | 124 | 121 | 128 | 122 |
| Humidity/Visibility | 111 | 101 | 114 | 103 | 112 | 108 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 685 | 707 | 683 | 698 | 677 | 704 |
| Tmin | 683 | 707 | 682 | 697 | 685 | 705 |
| Duration of sunshine | 86 | 114 | 98 | 88 | 70 | 62 |
| Precipitation | 126 | 156 | 154 | 147 | 119 | 126 |
| Humidity/Visibility | 117 | 138 | 135 | 128 | 108 | 116 |
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. |
