Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1158 | 1063 | 1168 | 1138 | 1177 | 1139 |
| Tmin | 1160 | 1065 | 1172 | 1138 | 1178 | 1137 |
| Duration of sunshine | 184 | 161 | 175 | 161 | 182 | 169 |
| Precipitation | 186 | 169 | 189 | 181 | 186 | 180 |
| Humidity/Visibility | 185 | 167 | 184 | 178 | 185 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1176 | 1175 | 1165 | 1202 | 1168 | 1211 |
| Tmin | 1178 | 1179 | 1169 | 1204 | 1159 | 1207 |
| Duration of sunshine | 176 | 172 | 199 | 188 | 172 | 213 |
| Precipitation | 186 | 189 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 184 | 185 | 205 | 208 | 181 | 214 |
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. |
