Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1257 | 1142 | 1239 | 1221 | 1260 | 1221 |
| Tmin | 1222 | 1111 | 1213 | 1187 | 1234 | 1195 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 187 | 169 | 186 | 180 | 186 | 179 |
| Humidity/Visibility | 162 | 148 | 164 | 153 | 161 | 156 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1257 | 1264 | 1244 | 1291 | 1247 | 1269 |
| Tmin | 1231 | 1228 | 1214 | 1259 | 1215 | 1264 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 187 | 189 | 210 | 216 | 212 | 191 |
| Humidity/Visibility | 162 | 162 | 187 | 188 | 180 | 181 |
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. |
