Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2123 | 1922 | 2126 | 2057 | 2112 | 2056 |
| Tmin | 2133 | 1926 | 2134 | 2058 | 2114 | 2060 |
| Duration of sunshine | 62 | 57 | 62 | 60 | 124 | 150 |
| Precipitation | 187 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 184 | 166 | 184 | 176 | 183 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2123 | 2124 | 2086 | 2156 | 2094 | 2172 |
| Tmin | 2130 | 2128 | 2091 | 2162 | 2099 | 2175 |
| Duration of sunshine | 155 | 124 | 120 | 124 | 90 | 62 |
| Precipitation | 188 | 190 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 183 | 184 | 204 | 208 | 205 | 215 |
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. |
