Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 458 | 409 | 458 | 455 | 495 | 468 |
| Tmin | 460 | 409 | 460 | 457 | 491 | 468 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 316 | 289 | 322 | 323 | 347 | 336 |
| Humidity/Visibility | 74 | 76 | 86 | 100 | 106 | 101 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 489 | 486 | 475 | 486 | 466 | 482 |
| Tmin | 493 | 492 | 472 | 485 | 467 | 486 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 345 | 345 | 334 | 344 | 336 | 361 |
| Humidity/Visibility | 104 | 103 | 102 | 104 | 106 | 105 |
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. |
