Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1254 | 1144 | 1267 | 1222 | 1263 | 1227 |
| Tmin | 1252 | 1146 | 1265 | 1224 | 1261 | 1228 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 189 | 172 | 188 | 183 | 188 | 180 |
| Humidity/Visibility | 182 | 166 | 183 | 176 | 181 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1266 | 1268 | 1253 | 1290 | 1251 | 1294 |
| Tmin | 1263 | 1268 | 1254 | 1294 | 1254 | 1300 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 188 | 190 | 212 | 217 | 210 | 222 |
| Humidity/Visibility | 182 | 183 | 206 | 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. |
