Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2085 | 1893 | 2098 | 2023 | 2078 | 2023 |
| Tmin | 2089 | 1895 | 2104 | 2032 | 2076 | 2027 |
| Duration of sunshine | 62 | 57 | 62 | 60 | 124 | 150 |
| Precipitation | 186 | 168 | 187 | 182 | 187 | 181 |
| Humidity/Visibility | 180 | 160 | 177 | 171 | 174 | 168 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2091 | 2094 | 2055 | 2121 | 2055 | 2129 |
| Tmin | 2090 | 2089 | 2052 | 2126 | 2062 | 2128 |
| Duration of sunshine | 155 | 124 | 90 | 62 | 60 | 62 |
| Precipitation | 186 | 191 | 212 | 218 | 213 | 219 |
| Humidity/Visibility | 171 | 173 | 191 | 200 | 203 | 212 |
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. |
