Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 57 | 52 | 55 | 85 | 79 | 77 |
| Tmin | 62 | 55 | 59 | 89 | 88 | 83 |
| Duration of sunshine | 57 | 51 | 56 | 56 | 51 | 53 |
| Precipitation | 94 | 89 | 100 | 123 | 126 | 130 |
| Humidity/Visibility | 43 | 39 | 43 | 63 | 63 | 61 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 73 | 79 | 72 | 76 | 61 | 80 |
| Tmin | 86 | 87 | 87 | 85 | 71 | 88 |
| Duration of sunshine | 61 | 78 | 73 | 77 | 61 | 78 |
| Precipitation | 129 | 129 | 122 | 127 | 128 | 125 |
| Humidity/Visibility | 61 | 64 | 63 | 59 | 53 | 65 |
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. |
