Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 170 | 152 | 172 | 170 | 164 | 159 |
| Tmin | 172 | 158 | 175 | 176 | 163 | 162 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 187 | 169 | 188 | 181 | 186 | 180 |
| Humidity/Visibility | 179 | 165 | 182 | 176 | 181 | 175 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 168 | 171 | 181 | 165 | 170 | 195 |
| Tmin | 181 | 177 | 187 | 174 | 172 | 199 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 188 | 190 | 203 | 184 | 182 | 218 |
| Humidity/Visibility | 181 | 181 | 191 | 174 | 173 | 211 |
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. |
