Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1252 | 1147 | 1266 | 1202 | 1269 | 1228 |
| Tmin | 1255 | 1148 | 1269 | 1202 | 1270 | 1227 |
| Duration of sunshine | 93 | 84 | 124 | 120 | 124 | 120 |
| Precipitation | 186 | 169 | 187 | 183 | 186 | 180 |
| Humidity/Visibility | 183 | 166 | 184 | 178 | 184 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1269 | 1269 | 1255 | 1294 | 1255 | 1298 |
| Tmin | 1268 | 1273 | 1254 | 1294 | 1256 | 1299 |
| Duration of sunshine | 124 | 124 | 120 | 124 | 120 | 124 |
| Precipitation | 185 | 189 | 211 | 214 | 212 | 219 |
| Humidity/Visibility | 184 | 185 | 207 | 209 | 205 | 213 |
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. |
