Biplot of the weather parameters and the modelled genes. The modelled genes are represented as black dots and the weather parameters are coloured according to the legend. In addition to the colour each parameter is label with the calculation (min = minimum, max = maximum, mean = average, tot = cumulative sum, std = standard deviation) and day or time of measurement (m = morning, a = afternoon, e = evening). A number without additional letter corresponds to cumulative time period. The plot pinpoints the relationship between the different calculated weather parameters used for the modelling of the gene expression. Weather parameters close to each other in the plot are having a similar impact on gene expression. The weather parameters are further described in additional file 1 and 2.