Chill October is an 1870 oil painting by John Everett Millais which depicts a bleak Scottish landscape in autumn.
The right foreground is dominated by long grasses, with the landscape stretching out to the left past a river bank with wind-blown willows and reeds to a distant hill beside the Firth of Tay.
The scene is dominated by muted greens, yellows and browns of autumn, under a sombre grey sky.
It was exhibited at the Royal Academy in 1871, and won a prize at the Paris Exposition Universelle in 1878.
It was sold by Armstrong's heirs in 1910 for 4,800 guineas (£5,040), and remained in the same family for three generations until it was bought by Andrew Lloyd Webber in 1991 for £370,000.