Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1123 | 1056 | 1183 | 1146 | 1174 | 1138 |
| Tmin | 1142 | 1066 | 1187 | 1157 | 1180 | 1153 |
| Duration of sunshine | 163 | 136 | 166 | 165 | 170 | 162 |
| Precipitation | 784 | 714 | 800 | 773 | 783 | 758 |
| Humidity/Visibility | 166 | 152 | 161 | 153 | 151 | 141 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1176 | 1168 | 1158 | 1173 | 1135 | 1183 |
| Tmin | 1172 | 1167 | 1166 | 1171 | 1133 | 1189 |
| Duration of sunshine | 148 | 143 | 179 | 143 | 141 | 166 |
| Precipitation | 764 | 787 | 786 | 789 | 759 | 798 |
| Humidity/Visibility | 143 | 123 | 156 | 148 | 163 | 173 |
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. |
