Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1135 | 1063 | 1174 | 1135 | 1170 | 1136 |
| Tmin | 976 | 918 | 1013 | 987 | 1008 | 981 |
| Duration of sunshine | 248 | 196 | 217 | 240 | 248 | 270 |
| Precipitation | 186 | 169 | 189 | 181 | 186 | 180 |
| Humidity/Visibility | 168 | 156 | 170 | 167 | 172 | 165 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1169 | 1171 | 1140 | 1195 | 1159 | 1168 |
| Tmin | 1012 | 1016 | 959 | 1020 | 999 | 997 |
| Duration of sunshine | 279 | 248 | 270 | 248 | 270 | 279 |
| Precipitation | 188 | 191 | 210 | 214 | 208 | 191 |
| Humidity/Visibility | 167 | 170 | 192 | 187 | 181 | 183 |
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. |
