Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 834 | 755 | 834 | 808 | 833 | 809 |
| Tmin | 834 | 753 | 834 | 807 | 836 | 809 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 188 | 168 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 184 | 166 | 184 | 178 | 184 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 833 | 810 | 797 | 806 | 777 | 805 |
| Tmin | 834 | 808 | 793 | 804 | 775 | 805 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 186 | 190 | 212 | 215 | 209 | 219 |
| Humidity/Visibility | 183 | 184 | 206 | 210 | 205 | 214 |
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. |
