Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2154 | 1945 | 2149 | 2091 | 2142 | 2084 |
| Tmin | 2161 | 1956 | 2164 | 2093 | 2138 | 2091 |
| Duration of sunshine | 93 | 86 | 93 | 60 | 124 | 150 |
| Precipitation | 186 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 184 | 165 | 184 | 177 | 182 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2152 | 2153 | 2117 | 2185 | 2118 | 2192 |
| Tmin | 2165 | 2157 | 2125 | 2190 | 2123 | 2192 |
| Duration of sunshine | 155 | 124 | 120 | 124 | 90 | 93 |
| Precipitation | 188 | 190 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 182 | 183 | 205 | 208 | 203 | 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. |
