Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1130 | 1038 | 1145 | 1123 | 1178 | 1138 |
| Tmin | 1134 | 1038 | 1146 | 1125 | 1177 | 1139 |
| Duration of sunshine | 89 | 83 | 91 | 101 | 123 | 114 |
| Precipitation | 558 | 506 | 560 | 558 | 592 | 570 |
| Humidity/Visibility | 69 | 63 | 69 | 77 | 92 | 89 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1174 | 1176 | 1140 | 1169 | 1139 | 1177 |
| Tmin | 1175 | 1178 | 1140 | 1172 | 1138 | 1178 |
| Duration of sunshine | 121 | 121 | 120 | 110 | 113 | 113 |
| Precipitation | 587 | 591 | 569 | 589 | 570 | 589 |
| Humidity/Visibility | 92 | 92 | 89 | 87 | 94 | 99 |
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. |
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