def Aver_Plot(df, ax, label, color):
    """Creates line plots for a data frame

            Arguments:
                df - data frame for data you want to plot
                ax - which subplot do you want it to plot to
                label - legend label
                color - color of the line

            Returns:
                x - line on the time series plot
    """
    b = df.plot(y=df, kind='line', marker='.', use_index=True, ax=ax, label=label,
                             style='-', color=color)
    return b