Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2082 | 1894 | 2097 | 2028 | 2082 | 2022 |
| Tmin | 2092 | 1904 | 2107 | 2035 | 2085 | 2027 |
| Duration of sunshine | 62 | 57 | 62 | 60 | 124 | 120 |
| Precipitation | 187 | 168 | 187 | 183 | 187 | 180 |
| Humidity/Visibility | 180 | 162 | 175 | 167 | 172 | 168 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2083 | 2085 | 2055 | 2117 | 2048 | 2117 |
| Tmin | 2101 | 2092 | 2059 | 2129 | 2056 | 2120 |
| Duration of sunshine | 124 | 93 | 90 | 93 | 60 | 62 |
| Precipitation | 187 | 191 | 212 | 215 | 213 | 222 |
| Humidity/Visibility | 169 | 173 | 189 | 198 | 203 | 213 |
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. |
