Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 69 | 65 | 77 | 78 | 92 | 78 |
| Tmin | 96 | 87 | 93 | 96 | 96 | 90 |
| Duration of sunshine | 96 | 84 | 92 | 95 | 88 | 91 |
| Precipitation | 128 | 115 | 133 | 124 | 132 | 146 |
| Humidity/Visibility | 68 | 66 | 68 | 68 | 71 | 65 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 94 | 93 | 82 | 85 | 79 | 91 |
| Tmin | 92 | 93 | 92 | 98 | 88 | 94 |
| Duration of sunshine | 90 | 89 | 89 | 95 | 89 | 92 |
| Precipitation | 145 | 149 | 137 | 139 | 137 | 156 |
| Humidity/Visibility | 76 | 74 | 69 | 71 | 63 | 69 |
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. |
