Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1158 | 1062 | 1175 | 1152 | 1194 | 1163 |
| Tmin | 1159 | 1063 | 1177 | 1155 | 1198 | 1158 |
| Duration of sunshine | 72 | 64 | 79 | 88 | 112 | 101 |
| Precipitation | 745 | 679 | 745 | 738 | 778 | 750 |
| Humidity/Visibility | 89 | 80 | 89 | 103 | 121 | 115 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1204 | 1202 | 1154 | 1195 | 1161 | 1204 |
| Tmin | 1198 | 1207 | 1158 | 1198 | 1160 | 1207 |
| Duration of sunshine | 112 | 109 | 105 | 97 | 97 | 101 |
| Precipitation | 778 | 775 | 751 | 776 | 750 | 777 |
| Humidity/Visibility | 119 | 120 | 117 | 112 | 111 | 120 |
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. |
