Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1145 | 1034 | 1147 | 1125 | 1173 | 1137 |
| Tmin | 1764 | 1593 | 1764 | 1724 | 1796 | 1737 |
| Duration of sunshine | 31 | 28 | 31 | 30 | 31 | 60 |
| Precipitation | 94 | 86 | 96 | 109 | 123 | 120 |
| Humidity/Visibility | 91 | 83 | 91 | 103 | 120 | 118 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1167 | 1165 | 1138 | 1172 | 1134 | 1173 |
| Tmin | 1791 | 1782 | 1739 | 1793 | 1734 | 1796 |
| Duration of sunshine | 64 | 64 | 60 | 62 | 30 | 63 |
| Precipitation | 127 | 127 | 121 | 121 | 124 | 125 |
| Humidity/Visibility | 117 | 110 | 118 | 118 | 116 | 123 |
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. |
