Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1196 | 1102 | 1224 | 1202 | 1240 | 1205 |
| Tmin | 1195 | 1082 | 1215 | 1201 | 1241 | 1191 |
| Duration of sunshine | 124 | 169 | 155 | 180 | 186 | 180 |
| Precipitation | 702 | 620 | 688 | 689 | 729 | 709 |
| Humidity/Visibility | 114 | 93 | 111 | 134 | 136 | 129 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1244 | 1239 | 1190 | 1233 | 1208 | 1244 |
| Tmin | 1244 | 1238 | 1185 | 1234 | 1204 | 1233 |
| Duration of sunshine | 217 | 155 | 270 | 217 | 150 | 217 |
| Precipitation | 720 | 720 | 726 | 742 | 710 | 741 |
| Humidity/Visibility | 136 | 121 | 122 | 125 | 126 | 124 |
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. |
