Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 58 | 54 | 60 | 89 | 88 | 88 |
| Tmin | 62 | 57 | 62 | 90 | 90 | 88 |
| Duration of sunshine | 30 | 26 | 30 | 30 | 30 | 29 |
| Precipitation | 93 | 85 | 95 | 121 | 127 | 121 |
| Humidity/Visibility | 45 | 41 | 46 | 65 | 67 | 65 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 85 | 90 | 85 | 85 | 80 | 86 |
| Tmin | 90 | 93 | 89 | 88 | 81 | 91 |
| Duration of sunshine | 26 | 30 | 28 | 29 | 27 | 25 |
| Precipitation | 128 | 128 | 120 | 122 | 124 | 124 |
| Humidity/Visibility | 65 | 68 | 64 | 63 | 60 | 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. |
