Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1066 | 969 | 1069 | 1070 | 1097 | 1069 |
| Tmin | 1073 | 978 | 1077 | 1064 | 1104 | 1070 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 632 | 576 | 631 | 648 | 659 | 635 |
| Humidity/Visibility | 86 | 77 | 82 | 106 | 111 | 112 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1100 | 1103 | 1063 | 1093 | 1057 | 1099 |
| Tmin | 1099 | 1102 | 1070 | 1088 | 1060 | 1111 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 658 | 655 | 634 | 655 | 641 | 659 |
| Humidity/Visibility | 109 | 117 | 114 | 108 | 103 | 114 |
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. |
