Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 137 | 130 | 150 | 145 | 151 | 142 |
| Tmin | 139 | 119 | 140 | 148 | 152 | 139 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 159 | 141 | 155 | 151 | 155 | 150 |
| Humidity/Visibility | 107 | 93 | 105 | 92 | 96 | 96 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 132 | 163 | 168 | 166 | 155 | 115 |
| Tmin | 136 | 163 | 170 | 166 | 145 | 119 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 160 | 185 | 178 | 184 | 178 | 162 |
| Humidity/Visibility | 97 | 119 | 118 | 114 | 98 | 93 |
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. |
