Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1612 | 1456 | 1612 | 1560 | 1612 | 1560 |
| Tmin | 1612 | 1456 | 1612 | 1560 | 1612 | 1560 |
| Duration of sunshine | 155 | 169 | 186 | 180 | 217 | 120 |
| Precipitation | 60 | 52 | 58 | 52 | 67 | 78 |
| Humidity/Visibility | 40 | 38 | 38 | 35 | 49 | 60 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1612 | 1612 | 1560 | 1612 | 1560 | 1612 |
| Tmin | 1612 | 1612 | 1560 | 1612 | 1560 | 1612 |
| Duration of sunshine | 217 | 155 | 180 | 217 | 150 | 186 |
| Precipitation | 83 | 91 | 66 | 71 | 78 | 55 |
| Humidity/Visibility | 54 | 56 | 63 | 45 | 65 | 53 |
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. |
