Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 119 | 109 | 111 | 110 | 114 | 111 |
| Tmin | 108 | 108 | 118 | 118 | 122 | 117 |
| Duration of sunshine | 117 | 109 | 110 | 109 | 114 | 99 |
| Precipitation | 124 | 114 | 124 | 120 | 122 | 124 |
| Humidity/Visibility | 122 | 110 | 116 | 114 | 118 | 113 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 113 | 112 | 102 | 97 | 113 | 92 |
| Tmin | 117 | 119 | 109 | 107 | 118 | 94 |
| Duration of sunshine | 113 | 111 | 102 | 92 | 111 | 88 |
| Precipitation | 128 | 134 | 126 | 132 | 123 | 126 |
| Humidity/Visibility | 119 | 117 | 104 | 100 | 116 | 115 |
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. |
