Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 739 | 668 | 741 | 718 | 741 | 719 |
| Tmin | 742 | 667 | 742 | 713 | 742 | 715 |
| Duration of sunshine | 270 | 243 | 273 | 251 | 266 | 257 |
| Precipitation | 620 | 562 | 620 | 607 | 620 | 600 |
| Humidity/Visibility | 183 | 165 | 182 | 177 | 183 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 742 | 738 | 745 | 764 | 739 | 771 |
| Tmin | 742 | 742 | 743 | 765 | 743 | 772 |
| Duration of sunshine | 271 | 264 | 281 | 293 | 316 | 324 |
| Precipitation | 622 | 626 | 632 | 649 | 632 | 217 |
| Humidity/Visibility | 183 | 182 | 204 | 206 | 203 | 212 |
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. |
