Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 992 | 896 | 992 | 960 | 992 | 960 |
| Tmin | 992 | 896 | 992 | 960 | 992 | 960 |
| Duration of sunshine | 124 | 112 | 155 | 180 | 186 | 120 |
| Precipitation | 34 | 32 | 38 | 33 | 32 | 32 |
| Humidity/Visibility | 29 | 27 | 29 | 29 | 32 | 33 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 992 | 992 | 960 | 992 | 960 | 992 |
| Tmin | 992 | 992 | 960 | 992 | 960 | 992 |
| Duration of sunshine | 186 | 155 | 180 | 186 | 150 | 155 |
| Precipitation | 35 | 32 | 38 | 35 | 37 | 50 |
| Humidity/Visibility | 32 | 31 | 29 | 28 | 58 | 46 |
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. |
