Spring (April-May): Mild temperatures (12-18°C), blooming gardens at Herrenhausen, Easter markets. Perfect for garden exploration. Summer (June-August): Warm weather (18-24°C), outdoor lakeside activities, beer gardens, festival season. Maschsee is ideal for swimming and water sports. Autumn (September-October): Pleasant temperatures (10-16°C), fewer crowds, fall foliage in parks. Winter (November-March): Cold (2-8°C), Christmas markets (November-December), fewer tourists, lower accommodation prices.
Overall: May and September offer the best balance of weather and manageable crowds. Avoid July-August peak season if you prefer smaller crowds.