Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 744 | 672 | 744 | 720 | 744 | 720 |
| Tmin | 744 | 672 | 744 | 720 | 744 | 720 |
| Duration of sunshine | 248 | 254 | 217 | 270 | 310 | 240 |
| Precipitation | 35 | 30 | 35 | 30 | 31 | 34 |
| Humidity/Visibility | 29 | 27 | 30 | 30 | 32 | 33 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 744 | 744 | 720 | 744 | 720 | 744 |
| Tmin | 744 | 744 | 720 | 744 | 720 | 744 |
| Duration of sunshine | 310 | 279 | 300 | 310 | 210 | 279 |
| Precipitation | 34 | 34 | 37 | 35 | 36 | 50 |
| Humidity/Visibility | 33 | 30 | 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. |
