Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1263 | 1146 | 1258 | 1222 | 1254 | 1216 |
| Tmin | 1232 | 1120 | 1238 | 1198 | 1226 | 1188 |
| Duration of sunshine | 186 | 114 | 0 | 180 | 217 | 240 |
| Precipitation | 186 | 169 | 185 | 180 | 186 | 178 |
| Humidity/Visibility | 158 | 149 | 157 | 154 | 156 | 152 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1253 | 1268 | 1249 | 1291 | 1251 | 1261 |
| Tmin | 1235 | 1237 | 1222 | 1266 | 1220 | 1261 |
| Duration of sunshine | 62 | 217 | 240 | 155 | 90 | 186 |
| Precipitation | 187 | 189 | 210 | 215 | 214 | 191 |
| Humidity/Visibility | 159 | 161 | 184 | 182 | 174 | 175 |
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. |
