Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 525 | 471 | 523 | 504 | 516 | 509 |
| Tmin | 527 | 467 | 520 | 503 | 516 | 504 |
| Duration of sunshine | 186 | 158 | 179 | 170 | 172 | 173 |
| Precipitation | 186 | 170 | 186 | 189 | 186 | 180 |
| Humidity/Visibility | 183 | 166 | 182 | 175 | 183 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 523 | 521 | 537 | 548 | 530 | 555 |
| Tmin | 524 | 524 | 534 | 546 | 533 | 557 |
| Duration of sunshine | 176 | 173 | 197 | 201 | 203 | 214 |
| Precipitation | 186 | 192 | 214 | 215 | 212 | 217 |
| Humidity/Visibility | 183 | 183 | 204 | 208 | 202 | 213 |
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. |
