Group 1 - The average national temperature in China since October is 11.1℃, close to the normal level for the same period, exhibiting characteristics of "warm at the front and cold at the back" and "cold in the north and warm in the south" [1] - There has been an increase in the activity of cold air since October compared to September, with three cold air processes occurring, which is close to the normal level for the same period [1] - The monitoring of seasonal progress indicates that most northern regions have entered winter, with significant differences in the timing of winter onset compared to normal years [1] Group 2 - As of September, the equatorial central and eastern Pacific is in a neutral to slightly cold state regarding ENSO, with expectations of entering a La Niña state in the late autumn and lasting until early 2026 [2] - The forecast for this winter suggests that the national average temperature will be close to or slightly above the normal level, with overall less precipitation and a "more in the north, less in the south" distribution [2] - There is a low risk of widespread persistent low-temperature rain, snow, and freezing weather in southern regions this winter, with significant fluctuations in temperature expected [2]