Kanatal works in three quite different seasons. April to June is the classic summer hill-station escape from Delhi heat — daytime temperatures around 20 to 25 degrees, cool nights, green forests. The monsoon (July to September) brings heavy rain and frequent landslides on the Chamba-Mussoorie road; avoid it unless you have a flexible itinerary.
December to February is the most distinctive season: it snows, often heavily, and the resorts fill with families coming up from the plains for their first sight of snow. April and October are arguably the best months, with clear skies and quiet trails.