Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 739 | 668 | 743 | 741 | 765 | 747 |
| Tmin | 680 | 617 | 680 | 680 | 690 | 659 |
| Duration of sunshine | 248 | 226 | 217 | 270 | 310 | 300 |
| Precipitation | 247 | 222 | 246 | 264 | 272 | 270 |
| Humidity/Visibility | 92 | 82 | 84 | 110 | 111 | 111 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 768 | 767 | 745 | 764 | 744 | 770 |
| Tmin | 679 | 681 | 657 | 676 | 657 | 678 |
| Duration of sunshine | 248 | 310 | 300 | 217 | 270 | 248 |
| Precipitation | 277 | 283 | 273 | 274 | 295 | 340 |
| Humidity/Visibility | 110 | 110 | 106 | 104 | 100 | 107 |
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. |
