Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 81 | 71 | 83 | 101 | 117 | 105 |
| Tmin | 80 | 76 | 81 | 104 | 117 | 112 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 119 | 121 | 135 | 159 | 150 | 146 |
| Humidity/Visibility | 73 | 65 | 72 | 91 | 105 | 97 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 108 | 105 | 96 | 93 | 105 | 103 |
| Tmin | 110 | 116 | 112 | 109 | 99 | 101 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 164 | 146 | 142 | 140 | 157 | 170 |
| Humidity/Visibility | 105 | 102 | 96 | 88 | 86 | 94 |
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. |
