Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 98 | 96 | 105 | 99 | 102 | 96 |
| Tmin | 108 | 105 | 97 | 95 | 107 | 91 |
| Duration of sunshine | 194 | 128 | 124 | 93 | 138 | 150 |
| Precipitation | 132 | 119 | 133 | 136 | 135 | 133 |
| Humidity/Visibility | 96 | 93 | 96 | 91 | 92 | 85 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 101 | 110 | 97 | 77 | 80 | 108 |
| Tmin | 95 | 104 | 96 | 78 | 76 | 93 |
| Duration of sunshine | 93 | 132 | 156 | 105 | 105 | 157 |
| Precipitation | 136 | 153 | 142 | 124 | 128 | 155 |
| Humidity/Visibility | 86 | 91 | 87 | 67 | 72 | 97 |
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. |
