Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1169 | 1081 | 1194 | 1153 | 1187 | 1149 |
| Tmin | 1168 | 1081 | 1184 | 1139 | 1174 | 1141 |
| Duration of sunshine | 0 | 56 | 62 | 60 | 62 | 0 |
| Precipitation | 743 | 673 | 745 | 718 | 738 | 711 |
| Humidity/Visibility | 168 | 156 | 167 | 157 | 159 | 153 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1184 | 1193 | 1185 | 1221 | 1181 | 1210 |
| Tmin | 1166 | 1180 | 1165 | 1202 | 1154 | 1205 |
| Duration of sunshine | 62 | 31 | 60 | 62 | 30 | 62 |
| Precipitation | 738 | 742 | 747 | 769 | 745 | 746 |
| Humidity/Visibility | 156 | 160 | 180 | 182 | 173 | 185 |
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. |
