Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 104 | 81 | 97 | 91 | 103 | 92 |
| Tmin | 101 | 87 | 104 | 95 | 97 | 91 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 140 | 122 | 137 | 135 | 143 | 135 |
| Humidity/Visibility | 99 | 88 | 96 | 82 | 90 | 91 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 101 | 119 | 124 | 120 | 97 | 78 |
| Tmin | 97 | 102 | 118 | 112 | 99 | 73 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 142 | 175 | 170 | 151 | 145 | 136 |
| Humidity/Visibility | 92 | 101 | 114 | 109 | 87 | 76 |
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. |
