Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2190 | 1983 | 2186 | 2123 | 2182 | 2115 |
| Tmin | 2192 | 1986 | 2177 | 2094 | 2158 | 2093 |
| Duration of sunshine | 124 | 114 | 93 | 90 | 155 | 180 |
| Precipitation | 186 | 169 | 186 | 180 | 186 | 179 |
| Humidity/Visibility | 174 | 152 | 168 | 161 | 163 | 158 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2175 | 2186 | 2150 | 2219 | 2149 | 2218 |
| Tmin | 2161 | 2162 | 2123 | 2222 | 2152 | 2217 |
| Duration of sunshine | 186 | 155 | 150 | 155 | 120 | 124 |
| Precipitation | 187 | 189 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 156 | 165 | 188 | 197 | 197 | 210 |
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. |
