Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1293 | 1166 | 1286 | 1249 | 1276 | 1239 |
| Tmin | 1295 | 1172 | 1297 | 1252 | 1279 | 1249 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 186 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 184 | 165 | 184 | 178 | 182 | 176 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1284 | 1286 | 1272 | 1319 | 1282 | 1335 |
| Tmin | 1295 | 1292 | 1282 | 1325 | 1289 | 1332 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 188 | 190 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 182 | 184 | 203 | 208 | 201 | 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. |
