St. Martin's Summers, near Moret-sur-Loing

St. Martin's Summers, near Moret-sur-Loing of 1891 at the Musée Marmottan Monet captures the atmospheric phenomenon known in French as l'été de la Saint-Martin — the brief warm spell that returns in November around the feast of Saint Martin of Tours, bringing mild temperatures and a distinctive mellow light to landscapes that have already experienced the year's first frosts. Sisley loved these marginal seasonal conditions precisely because they offered visual paradoxes — the warmth of Indian summer in a landscape that shows the physical signs of autumn's decline — and because the resulting light had a particular quality unavailable at any other time of year. The Marmottan Monet, one of Paris's finest Impressionist collections, holds this alongside works by Monet that treated the same seasonal phenomenon in different locations, allowing implicit comparison between the two painters' approaches to identical atmospheric conditions. The 1891 date places this canvas at the peak of Sisley's sustained engagement with his Moret landscape, when his mastery of seasonal atmospheric observation was at its most comprehensive.

Autumn's warmer palette distinguishes this canvas from Sisley's summer and winter works — ochres and russets in the landscape vegetation, the light more golden and raking than summer's direct overhead illumination. The Loing's surface reflects these warm tones, the autumn sky's particular quality of light softening the entire color range.