Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 399 | 364 | 400 | 398 | 436 | 434 |
| Tmin | 464 | 411 | 459 | 456 | 494 | 468 |
| Duration of sunshine | 124 | 141 | 155 | 150 | 155 | 150 |
| Precipitation | 343 | 321 | 347 | 355 | 374 | 364 |
| Humidity/Visibility | 74 | 68 | 74 | 86 | 108 | 112 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 426 | 433 | 418 | 418 | 412 | 417 |
| Tmin | 487 | 487 | 478 | 488 | 471 | 483 |
| Duration of sunshine | 124 | 124 | 150 | 124 | 150 | 155 |
| Precipitation | 378 | 380 | 364 | 372 | 368 | 136 |
| Humidity/Visibility | 105 | 104 | 104 | 97 | 98 | 98 |
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. |
