Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2099 | 1898 | 2093 | 2054 | 2114 | 2057 |
| Tmin | 2100 | 1904 | 2099 | 2048 | 2112 | 2061 |
| Duration of sunshine | 124 | 113 | 124 | 120 | 155 | 180 |
| Precipitation | 155 | 141 | 156 | 172 | 186 | 180 |
| Humidity/Visibility | 153 | 139 | 153 | 168 | 182 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2122 | 2122 | 2059 | 2126 | 2060 | 2135 |
| Tmin | 2135 | 2125 | 2061 | 2129 | 2068 | 2139 |
| Duration of sunshine | 155 | 155 | 150 | 155 | 90 | 124 |
| Precipitation | 188 | 188 | 180 | 184 | 193 | 203 |
| Humidity/Visibility | 182 | 180 | 178 | 179 | 183 | 194 |
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. |
