Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 190 | 172 | 196 | 183 | 199 | 188 |
| Tmin | 188 | 171 | 194 | 185 | 192 | 186 |
| Duration of sunshine | 32 | 29 | 36 | 36 | 33 | 35 |
| Precipitation | 75 | 70 | 86 | 81 | 94 | 94 |
| Humidity/Visibility | 31 | 25 | 32 | 28 | 34 | 29 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 185 | 186 | 182 | 205 | 200 | 191 |
| Tmin | 188 | 196 | 193 | 199 | 193 | 192 |
| Duration of sunshine | 35 | 39 | 43 | 40 | 40 | 38 |
| Precipitation | 77 | 68 | 81 | 110 | 106 | 105 |
| Humidity/Visibility | 30 | 29 | 34 | 40 | 37 | 35 |
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. |
