Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 711 | 638 | 709 | 686 | 707 | 687 |
| Tmin | 712 | 637 | 709 | 678 | 706 | 687 |
| Duration of sunshine | 309 | 242 | 273 | 252 | 262 | 257 |
| Precipitation | 186 | 172 | 186 | 189 | 186 | 180 |
| Humidity/Visibility | 182 | 165 | 182 | 177 | 179 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 706 | 678 | 685 | 736 | 711 | 739 |
| Tmin | 709 | 681 | 682 | 734 | 713 | 738 |
| Duration of sunshine | 262 | 234 | 252 | 323 | 322 | 336 |
| Precipitation | 187 | 163 | 182 | 215 | 214 | 216 |
| Humidity/Visibility | 183 | 181 | 202 | 208 | 203 | 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. |
