Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 61 | 50 | 39 | 74 | 86 | 58 |
| Tmin | 60 | 49 | 35 | 74 | 85 | 62 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 64 | 57 | 62 | 77 | 95 | 91 |
| Humidity/Visibility | 60 | 49 | 37 | 74 | 83 | 61 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 89 | 88 | 86 | 87 | 83 | 76 |
| Tmin | 81 | 90 | 87 | 81 | 85 | 82 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 95 | 95 | 91 | 91 | 91 | 94 |
| Humidity/Visibility | 88 | 90 | 87 | 81 | 85 | 82 |
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. |
