Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 138 | 123 | 147 | 144 | 149 | 135 |
| Tmin | 143 | 131 | 146 | 145 | 150 | 139 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 156 | 141 | 157 | 151 | 155 | 150 |
| Humidity/Visibility | 144 | 136 | 151 | 137 | 148 | 143 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 147 | 164 | 169 | 170 | 168 | 147 |
| Tmin | 147 | 158 | 170 | 167 | 174 | 146 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 160 | 187 | 180 | 183 | 180 | 160 |
| Humidity/Visibility | 146 | 157 | 166 | 161 | 129 | 144 |
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. |
