Hi,
an example would be
a) create new content type with fields Place, Temperature and Humidity.
b) enter few articles with this content type
c) create new search/list type and select Chart template for list, set it tocolumn or combo nad selct Separated mode.
d) In list tab put Place field in datatext column - this is where labels on the chart come from. Put Temperature and Humidity to data column, fields that you put in this column should contain numbers.