Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1109 | 1036 | 1145 | 1107 | 1125 | 1108 |
| Tmin | 1141 | 1063 | 1176 | 1138 | 1159 | 1138 |
| Duration of sunshine | 248 | 225 | 217 | 270 | 279 | 270 |
| Precipitation | 186 | 168 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 175 | 158 | 174 | 169 | 173 | 168 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1141 | 1146 | 1115 | 1166 | 1134 | 1170 |
| Tmin | 1176 | 1180 | 1145 | 1197 | 1165 | 1181 |
| Duration of sunshine | 310 | 310 | 270 | 310 | 210 | 279 |
| Precipitation | 189 | 191 | 210 | 215 | 210 | 191 |
| Humidity/Visibility | 172 | 175 | 197 | 199 | 195 | 188 |
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. |
