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As a gateway city to the skiing resorts of the French Alps above, Grenoble sees lots of visitors fly in between November and March. The holiday periods of late December and February are the busiest of the winter months, and with good reason. Grenoble is beautifully festive at Christmas and in February the snow is at its best.
For warm summer weather, fly to Grenoble between May and September. You'll be able to explore the city with plenty of elbow space and take in the stunning Alpine scenery from the terraces of al fresco cafés in the historic quarter. The long hours of daylight and fair weather are also superb for hiking in the mountains, although July can be roastingly hot.