Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1341 | 1215 | 1333 | 1290 | 1333 | 1290 |
| Tmin | 1341 | 1215 | 1333 | 1290 | 1333 | 1290 |
| Duration of sunshine | 1116 | 986 | 1085 | 1050 | 1146 | 1079 |
| Precipitation | 157 | 140 | 156 | 153 | 155 | 150 |
| Humidity/Visibility | 154 | 139 | 154 | 149 | 154 | 149 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1333 | 1333 | 1290 | 1333 | 1290 | 1333 |
| Tmin | 1333 | 1333 | 1290 | 1333 | 1290 | 1333 |
| Duration of sunshine | 1122 | 1178 | 1170 | 1209 | 1184 | 1209 |
| Precipitation | 162 | 178 | 179 | 169 | 150 | 186 |
| Humidity/Visibility | 158 | 169 | 171 | 163 | 148 | 184 |
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. |
