Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2883 | 2615 | 2883 | 2790 | 2883 | 2790 |
| Tmin | 2883 | 2615 | 2883 | 2790 | 2883 | 2790 |
| Duration of sunshine | 1301 | 1180 | 1302 | 1259 | 1299 | 1258 |
| Precipitation | 188 | 168 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 185 | 167 | 185 | 179 | 184 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2883 | 2883 | 2790 | 2883 | 2790 | 2883 |
| Tmin | 2883 | 2883 | 2790 | 2883 | 2790 | 2883 |
| Duration of sunshine | 1300 | 1305 | 1283 | 1321 | 1284 | 1327 |
| Precipitation | 188 | 190 | 210 | 214 | 210 | 217 |
| Humidity/Visibility | 184 | 184 | 206 | 210 | 206 | 214 |
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. |
