Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1549 | 1399 | 1550 | 1515 | 1581 | 1529 |
| Tmin | 1178 | 1065 | 1175 | 1152 | 1208 | 1167 |
| Duration of sunshine | 61 | 56 | 60 | 72 | 90 | 87 |
| Precipitation | 62 | 57 | 62 | 75 | 93 | 90 |
| Humidity/Visibility | 61 | 56 | 61 | 74 | 92 | 89 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1579 | 1577 | 1529 | 1575 | 1526 | 1578 |
| Tmin | 1199 | 1205 | 1168 | 1203 | 1168 | 1207 |
| Duration of sunshine | 85 | 89 | 86 | 81 | 87 | 91 |
| Precipitation | 95 | 94 | 90 | 90 | 90 | 95 |
| Humidity/Visibility | 91 | 90 | 88 | 87 | 88 | 92 |
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. |
