Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1163 | 1082 | 1204 | 1159 | 1198 | 1170 |
| Tmin | 1168 | 1082 | 1205 | 1164 | 1198 | 1164 |
| Duration of sunshine | 182 | 154 | 181 | 175 | 181 | 172 |
| Precipitation | 787 | 726 | 784 | 761 | 779 | 754 |
| Humidity/Visibility | 180 | 156 | 183 | 175 | 183 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1199 | 1206 | 1188 | 1222 | 1182 | 1236 |
| Tmin | 1203 | 1208 | 1187 | 1225 | 1183 | 1232 |
| Duration of sunshine | 177 | 182 | 200 | 200 | 192 | 206 |
| Precipitation | 773 | 787 | 794 | 818 | 787 | 816 |
| Humidity/Visibility | 181 | 183 | 202 | 204 | 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. |
