Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 428 | 390 | 433 | 420 | 433 | 417 |
| Tmin | 424 | 393 | 432 | 420 | 432 | 419 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 124 | 113 | 124 | 123 | 126 | 120 |
| Humidity/Visibility | 117 | 109 | 120 | 115 | 119 | 117 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 431 | 431 | 418 | 426 | 418 | 432 |
| Tmin | 428 | 430 | 416 | 426 | 417 | 431 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 130 | 126 | 121 | 128 | 120 | 125 |
| Humidity/Visibility | 119 | 119 | 116 | 116 | 115 | 122 |
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. |
