Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1268 | 1147 | 1260 | 1221 | 1261 | 1222 |
| Tmin | 1232 | 1122 | 1234 | 1197 | 1234 | 1195 |
| Duration of sunshine | 217 | 197 | 217 | 240 | 279 | 270 |
| Precipitation | 186 | 169 | 186 | 180 | 186 | 179 |
| Humidity/Visibility | 160 | 148 | 161 | 155 | 160 | 154 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1261 | 1269 | 1254 | 1296 | 1257 | 1265 |
| Tmin | 1234 | 1239 | 1222 | 1263 | 1223 | 1264 |
| Duration of sunshine | 186 | 219 | 250 | 310 | 180 | 217 |
| Precipitation | 187 | 189 | 210 | 215 | 211 | 191 |
| Humidity/Visibility | 159 | 165 | 181 | 183 | 182 | 182 |
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. |
