Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2098 | 1898 | 2065 | 2005 | 2054 | 1998 |
| Tmin | 2105 | 1902 | 2073 | 2006 | 2057 | 2002 |
| Duration of sunshine | 124 | 114 | 93 | 90 | 155 | 180 |
| Precipitation | 186 | 170 | 159 | 152 | 160 | 153 |
| Humidity/Visibility | 177 | 162 | 154 | 147 | 142 | 143 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2061 | 2070 | 2034 | 2126 | 2062 | 2131 |
| Tmin | 2075 | 2072 | 2036 | 2126 | 2067 | 2137 |
| Duration of sunshine | 186 | 124 | 150 | 155 | 120 | 124 |
| Precipitation | 157 | 160 | 182 | 215 | 212 | 218 |
| Humidity/Visibility | 152 | 150 | 176 | 197 | 206 | 214 |
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. |
