Core Viewpoint - The article provides a guide for viewing ginkgo trees in Beijing, highlighting the impact of microclimate conditions on the color change of ginkgo leaves and offering a timeline for optimal viewing periods. Group 1: Viewing Periods - Initial viewing period for ginkgo trees in urban and suburban areas is marked by a color change rate of 30-60%, expected around November 1 [4] - The best viewing period for urban and nearby suburban areas is from November 1 to November 10, with a color change rate of 60-80% [5] - In mountainous and remote areas, the viewing period has already ended, with most leaves having fallen [5] Group 2: Meteorological Influences - The arrival of cold air and the extent of temperature drop are the main meteorological factors affecting the start of ginkgo leaf color change [6] - Leaf color change accelerates when temperatures drop to between 5°C and 0°C, and leaves are prone to falling when temperatures drop below 0°C [7] - Strong winds (5-6 level) can cause leaves to fall within a day, while heavy rain or snow can also accelerate leaf drop [13][14] Group 3: Tree Size and Leaf Change - Smaller ginkgo trees change color earlier due to less developed root systems, leading to earlier yellowing and leaf drop compared to larger trees [8] - Larger ginkgo trees, being robust, typically follow normal leaf drop patterns based on temperature [10]