Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 443 | 400 | 423 | 402 | 445 | 422 |
| Tmin | 449 | 394 | 428 | 406 | 443 | 431 |
| Duration of sunshine | 197 | 174 | 146 | 165 | 195 | 220 |
| Precipitation | 478 | 435 | 459 | 450 | 495 | 473 |
| Humidity/Visibility | 41 | 37 | 27 | 17 | 53 | 53 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 439 | 444 | 432 | 437 | 423 | 427 |
| Tmin | 440 | 451 | 429 | 434 | 419 | 433 |
| Duration of sunshine | 255 | 266 | 218 | 155 | 175 | 153 |
| Precipitation | 473 | 492 | 472 | 487 | 517 | 544 |
| Humidity/Visibility | 35 | 57 | 47 | 46 | 59 | 40 |
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. |
