Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 136 | 131 | 140 | 137 | 140 | 135 |
| Tmin | 141 | 129 | 141 | 137 | 136 | 132 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 164 | 155 | 173 | 164 | 161 | 154 |
| Humidity/Visibility | 107 | 99 | 108 | 108 | 109 | 108 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 139 | 146 | 166 | 161 | 139 | 157 |
| Tmin | 149 | 139 | 158 | 159 | 144 | 168 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 158 | 173 | 191 | 199 | 202 | 192 |
| Humidity/Visibility | 116 | 115 | 125 | 121 | 109 | 127 |
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. |
