Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1240 | 1131 | 1254 | 1220 | 1257 | 1218 |
| Tmin | 1231 | 1139 | 1227 | 1193 | 1226 | 1190 |
| Duration of sunshine | 217 | 141 | 186 | 150 | 155 | 210 |
| Precipitation | 176 | 169 | 185 | 181 | 186 | 179 |
| Humidity/Visibility | 148 | 141 | 151 | 153 | 153 | 150 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1258 | 1257 | 1238 | 1280 | 1255 | 1262 |
| Tmin | 1235 | 1232 | 1211 | 1253 | 1226 | 1258 |
| Duration of sunshine | 217 | 248 | 210 | 248 | 210 | 248 |
| Precipitation | 187 | 191 | 210 | 214 | 211 | 191 |
| Humidity/Visibility | 160 | 160 | 182 | 176 | 177 | 170 |
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. |
