Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1230 | 1121 | 1234 | 1193 | 1205 | 1175 |
| Tmin | 1203 | 1095 | 1205 | 1164 | 1177 | 1144 |
| Duration of sunshine | 217 | 225 | 248 | 240 | 310 | 240 |
| Precipitation | 186 | 169 | 186 | 180 | 186 | 179 |
| Humidity/Visibility | 165 | 150 | 165 | 159 | 163 | 157 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1228 | 1234 | 1222 | 1265 | 1227 | 1236 |
| Tmin | 1203 | 1208 | 1193 | 1234 | 1197 | 1239 |
| Duration of sunshine | 217 | 217 | 180 | 310 | 180 | 217 |
| Precipitation | 187 | 189 | 210 | 215 | 212 | 193 |
| Humidity/Visibility | 163 | 166 | 185 | 186 | 184 | 180 |
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. |
