Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 782 | 697 | 786 | 760 | 784 | 756 |
| Tmin | 764 | 696 | 776 | 760 | 788 | 763 |
| Duration of sunshine | 343 | 228 | 321 | 226 | 276 | 288 |
| Precipitation | 629 | 572 | 623 | 632 | 650 | 645 |
| Humidity/Visibility | 87 | 78 | 93 | 92 | 96 | 91 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 787 | 786 | 761 | 799 | 750 | 780 |
| Tmin | 786 | 784 | 749 | 796 | 742 | 781 |
| Duration of sunshine | 154 | 274 | 223 | 337 | 254 | 340 |
| Precipitation | 643 | 658 | 665 | 677 | 624 | 141 |
| Humidity/Visibility | 94 | 95 | 93 | 107 | 79 | 91 |
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. |
