Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 395 | 357 | 392 | 384 | 394 | 379 |
| Tmin | 520 | 472 | 522 | 504 | 524 | 516 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 103 | 94 | 99 | 99 | 96 | 108 |
| Humidity/Visibility | 65 | 59 | 64 | 65 | 66 | 69 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 390 | 398 | 383 | 394 | 402 | 422 |
| Tmin | 546 | 554 | 534 | 539 | 521 | 552 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 130 | 130 | 121 | 124 | 127 | 136 |
| Humidity/Visibility | 77 | 81 | 79 | 77 | 78 | 85 |
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. |
