Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 151 | 124 | 153 | 153 | 160 | 133 |
| Tmin | 165 | 142 | 163 | 166 | 168 | 159 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 191 | 183 | 205 | 197 | 195 | 182 |
| Humidity/Visibility | 167 | 152 | 162 | 154 | 152 | 143 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 143 | 142 | 170 | 147 | 138 | 164 |
| Tmin | 146 | 146 | 185 | 148 | 139 | 163 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 174 | 195 | 222 | 196 | 188 | 202 |
| Humidity/Visibility | 144 | 123 | 155 | 149 | 165 | 174 |
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. |
