Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 56 | 54 | 57 | 85 | 84 | 84 |
| Tmin | 59 | 57 | 58 | 88 | 92 | 85 |
| Duration of sunshine | 56 | 53 | 58 | 56 | 55 | 55 |
| Precipitation | 96 | 91 | 97 | 125 | 126 | 126 |
| Humidity/Visibility | 43 | 40 | 44 | 63 | 65 | 62 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 79 | 86 | 84 | 87 | 75 | 84 |
| Tmin | 86 | 86 | 86 | 87 | 78 | 90 |
| Duration of sunshine | 67 | 85 | 84 | 87 | 75 | 84 |
| Precipitation | 131 | 129 | 124 | 126 | 124 | 127 |
| Humidity/Visibility | 62 | 64 | 63 | 62 | 58 | 66 |
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. |
