Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1417 | 1284 | 1420 | 1375 | 1419 | 1374 |
| Tmin | 1416 | 1287 | 1420 | 1368 | 1418 | 1371 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 124 | 115 | 126 | 123 | 127 | 121 |
| Humidity/Visibility | 122 | 111 | 122 | 116 | 117 | 117 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1419 | 1420 | 1378 | 1417 | 1370 | 1417 |
| Tmin | 1419 | 1420 | 1374 | 1413 | 1376 | 1423 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 126 | 126 | 120 | 123 | 122 | 125 |
| Humidity/Visibility | 121 | 121 | 117 | 115 | 116 | 123 |
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. |
