Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 419 | 377 | 424 | 414 | 428 | 417 |
| Tmin | 418 | 381 | 427 | 419 | 425 | 414 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 128 | 112 | 124 | 121 | 124 | 120 |
| Humidity/Visibility | 99 | 88 | 103 | 109 | 107 | 110 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 426 | 447 | 433 | 440 | 435 | 424 |
| Tmin | 416 | 438 | 427 | 448 | 437 | 425 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 129 | 155 | 152 | 152 | 147 | 127 |
| Humidity/Visibility | 111 | 123 | 123 | 119 | 119 | 99 |
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. |
