Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1157 | 1064 | 1177 | 1134 | 1170 | 1136 |
| Tmin | 1160 | 1065 | 1177 | 1138 | 1174 | 1137 |
| Duration of sunshine | 262 | 228 | 285 | 289 | 304 | 286 |
| Precipitation | 715 | 649 | 719 | 696 | 713 | 690 |
| Humidity/Visibility | 140 | 126 | 145 | 137 | 141 | 136 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1175 | 1174 | 1164 | 1195 | 1163 | 1197 |
| Tmin | 1177 | 1179 | 1163 | 1202 | 1166 | 1196 |
| Duration of sunshine | 297 | 302 | 315 | 314 | 306 | 314 |
| Precipitation | 719 | 719 | 726 | 744 | 720 | 225 |
| Humidity/Visibility | 140 | 140 | 156 | 157 | 157 | 156 |
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. |
