Boxplot for the mean of the temperatures from July to October. The box plot gives a representation of the concentration of the mean temperature (from July to October) over the period 1745 to 1850. The years 1774 and 1756 are pointed out. The middle 50% of the years fall inside the grey box, whereas the 25% warmest and 25% coldest years are above and below the box, respectively. The black line in the rectangle corresponds to the median temperature.