Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 105 | 88 | 88 | 92 | 111 | 105 |
| Tmin | 133 | 110 | 118 | 119 | 132 | 132 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 153 | 137 | 143 | 141 | 154 | 151 |
| Humidity/Visibility | 114 | 93 | 102 | 107 | 124 | 120 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 113 | 105 | 105 | 94 | 80 | 110 |
| Tmin | 126 | 129 | 128 | 120 | 104 | 114 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 161 | 152 | 150 | 149 | 153 | 130 |
| Humidity/Visibility | 121 | 121 | 116 | 108 | 90 | 113 |
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. |
