Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1173 | 1066 | 1170 | 1149 | 1206 | 1165 |
| Tmin | 1173 | 1066 | 1170 | 1151 | 1205 | 1163 |
| Duration of sunshine | 276 | 278 | 308 | 305 | 336 | 324 |
| Precipitation | 743 | 674 | 746 | 739 | 777 | 750 |
| Humidity/Visibility | 89 | 82 | 89 | 100 | 121 | 114 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1207 | 1206 | 1168 | 1202 | 1167 | 1206 |
| Tmin | 1203 | 1209 | 1169 | 1202 | 1166 | 1206 |
| Duration of sunshine | 335 | 307 | 326 | 363 | 261 | 269 |
| Precipitation | 779 | 775 | 747 | 773 | 753 | 127 |
| Humidity/Visibility | 112 | 117 | 107 | 114 | 114 | 119 |
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. |
