近期北方比常年同期更冷吗？直接原因是它

Core Viewpoint - The recent cold wave in northern China has led to significantly lower temperatures, with average temperatures in 16 northern regions recorded at 10.4℃, close to the normal level of 10.2℃ for this time of year, but with some areas experiencing drops of 1℃ to 2℃ or more [1][3] Summary by Sections Temperature Analysis - The lowest temperature recorded in Beijing's southern suburbs reached -0.5℃ on October 20, with the 0℃ line moving to central North China [1] - The average temperature in northern regions has been affected by the Arctic Oscillation, which shifted from a positive to a negative phase, allowing cold air to spread southward [1][2] Weather Patterns - The persistent strong western and northern subtropical high has contributed to continuous low temperatures by facilitating the transport of warm, moist air that interacts with cold air, resulting in prolonged rainy weather [2] - The Central Meteorological Observatory predicts that temperatures in most northern areas will remain low until at least October 24, with southern regions also beginning to cool down [3] Agricultural Impact - The cold weather poses risks to agricultural production, particularly in northeastern regions and Inner Mongolia, where temperatures may drop by 4℃ to 6℃, leading to frost conditions [5] - Farmers are advised to expedite the autumn harvest and take measures to prevent crop damage due to low temperatures and moisture [5]