Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 801 | 723 | 802 | 777 | 802 | 778 |
| Tmin | 800 | 720 | 803 | 776 | 802 | 777 |
| Duration of sunshine | 179 | 160 | 182 | 168 | 165 | 167 |
| Precipitation | 653 | 594 | 651 | 637 | 653 | 630 |
| Humidity/Visibility | 181 | 164 | 181 | 176 | 182 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 802 | 801 | 804 | 826 | 801 | 832 |
| Tmin | 802 | 802 | 802 | 827 | 804 | 832 |
| Duration of sunshine | 165 | 163 | 184 | 197 | 203 | 211 |
| Precipitation | 655 | 659 | 662 | 680 | 666 | 219 |
| Humidity/Visibility | 181 | 181 | 201 | 207 | 202 | 210 |
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. |
