Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1576 | 1427 | 1575 | 1529 | 1579 | 1530 |
| Tmin | 1581 | 1427 | 1581 | 1529 | 1579 | 1528 |
| Duration of sunshine | 186 | 197 | 217 | 240 | 248 | 240 |
| Precipitation | 31 | 33 | 34 | 62 | 65 | 63 |
| Humidity/Visibility | 29 | 26 | 28 | 57 | 58 | 58 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1579 | 1580 | 1543 | 1608 | 1552 | 1607 |
| Tmin | 1580 | 1580 | 1544 | 1610 | 1559 | 1612 |
| Duration of sunshine | 186 | 186 | 240 | 248 | 150 | 248 |
| Precipitation | 66 | 64 | 76 | 100 | 93 | 94 |
| Humidity/Visibility | 60 | 60 | 72 | 89 | 85 | 69 |
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. |
