Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 792 | 719 | 785 | 762 | 786 | 770 |
| Tmin | 776 | 707 | 780 | 754 | 775 | 757 |
| Duration of sunshine | 279 | 198 | 248 | 210 | 217 | 240 |
| Precipitation | 186 | 169 | 187 | 182 | 186 | 180 |
| Humidity/Visibility | 169 | 152 | 159 | 161 | 164 | 163 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 794 | 798 | 797 | 829 | 803 | 830 |
| Tmin | 774 | 780 | 781 | 805 | 792 | 823 |
| Duration of sunshine | 310 | 248 | 180 | 217 | 210 | 310 |
| Precipitation | 189 | 190 | 210 | 215 | 211 | 217 |
| Humidity/Visibility | 166 | 169 | 186 | 188 | 193 | 202 |
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. |
