Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 806 | 728 | 805 | 779 | 805 | 780 |
| Tmin | 805 | 728 | 805 | 778 | 806 | 780 |
| Duration of sunshine | 340 | 309 | 367 | 388 | 434 | 419 |
| Precipitation | 155 | 143 | 155 | 150 | 155 | 150 |
| Humidity/Visibility | 153 | 138 | 154 | 148 | 154 | 148 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 801 | 803 | 779 | 800 | 777 | 803 |
| Tmin | 798 | 806 | 778 | 799 | 776 | 804 |
| Duration of sunshine | 394 | 372 | 356 | 391 | 324 | 370 |
| Precipitation | 154 | 155 | 152 | 155 | 151 | 155 |
| Humidity/Visibility | 150 | 152 | 148 | 147 | 146 | 153 |
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. |
