Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1224 | 1137 | 1262 | 1227 | 1238 | 1226 |
| Tmin | 1226 | 1136 | 1269 | 1220 | 1238 | 1225 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 187 | 170 | 188 | 181 | 187 | 180 |
| Humidity/Visibility | 183 | 166 | 184 | 178 | 182 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1267 | 1266 | 1237 | 1252 | 1226 | 1268 |
| Tmin | 1268 | 1268 | 1235 | 1251 | 1226 | 1266 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 186 | 191 | 211 | 214 | 211 | 216 |
| Humidity/Visibility | 183 | 183 | 205 | 209 | 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. |
