Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1238 | 1149 | 1271 | 1228 | 1261 | 1228 |
| Tmin | 1240 | 1148 | 1270 | 1227 | 1263 | 1229 |
| Duration of sunshine | 118 | 122 | 140 | 158 | 180 | 161 |
| Precipitation | 190 | 168 | 189 | 181 | 190 | 182 |
| Humidity/Visibility | 183 | 164 | 184 | 178 | 183 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1267 | 1270 | 1254 | 1295 | 1254 | 1300 |
| Tmin | 1271 | 1272 | 1255 | 1296 | 1256 | 1301 |
| Duration of sunshine | 175 | 184 | 185 | 156 | 130 | 120 |
| Precipitation | 186 | 192 | 214 | 221 | 210 | 221 |
| Humidity/Visibility | 183 | 184 | 204 | 207 | 204 | 212 |
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. |
