Core Viewpoint - The recent significant drop in temperatures in Ningxia is attributed to a strong cold air mass, contrasting with the previously warmer weather experienced during the "Three Nines" period [1] Summary by Relevant Sections Weather Conditions - From January 19 to 21, Ningxia is expected to experience low temperatures, with maximum temperatures ranging from -10℃ to -4℃ on January 19, and minimum temperatures between -19℃ and -12℃ on January 20 and 21 [1] - The recent warm weather during the "Three Nines" period (January 8 to 16) saw maximum temperatures reaching 14℃ in Yongning County and nearly 13℃ in Pingluo County, with many observation stations recording temperatures in the second and third historical rankings for this period [1] Meteorological Analysis - The frequency and intensity of cold air activity have been relatively low, with only one significant cold air event in mid-November last year, leading to an overall warmer trend in Ningxia [1] - The lack of cloud cover has resulted in strong solar radiation, contributing to the warming of the ground [1]

Group 1 - The average annual temperature in Sichuan is projected to be 16.1°C in 2025, which is 0.9°C higher than the historical average, marking it as the second warmest year alongside 2023, only behind 2024 [1] - Sichuan has experienced a continuous warming trend for 13 years, with record-breaking average temperatures since 2022, where the average has exceeded 16°C for three consecutive years, indicating the warmest period in history [1] - A significant heatwave occurred from June 10 to 17, 2025, with many areas in Sichuan experiencing unprecedented high temperatures, including 13 counties exceeding 40°C, and historical records being set for maximum daily temperatures [1] Group 2 - As of January 14, 2026, temperatures in cities like Chengdu and Leshan reached around 20°C, with forecasts indicating continued warm weather over the weekend [1] - A new wave of strong cold air is expected to impact regions including Xinjiang and the central and eastern parts of China starting January 17, leading to a drop in temperatures and the return of rainy weather in Sichuan by January 18 [2]

Group 1 - The core viewpoint of the articles highlights the unusual weather patterns in Hunan province, with temperatures significantly higher than the historical averages for this time of year, indicating a warm spell that resembles spring rather than winter [1][2]. - The Central Meteorological Station forecasts that the average temperature in southern regions, including Hunan, will be 1-2°C above the normal levels for the next ten days, with maximum temperatures reaching up to 18°C in Changsha on January 10, which is 9°C higher than the average for this period [1]. - The weather in Hunan will be predominantly sunny to partly cloudy over the next three days, with a notable drop in temperatures during the early morning and late evening, where local minimums may fall below 0°C [1]. Group 2 - The significant day-night temperature variation is attributed to the influence of cold, dry air from Siberia, which leads to clear and dry weather during the day, allowing for heating from sunlight, while the lack of cloud cover at night results in rapid cooling [2]. - Public advice includes dressing in layers to adapt to the large temperature swings, which is referred to as "onion-style" dressing, allowing for flexibility in clothing choices to manage the cold and warmth effectively [2].

Group 1: Temperature Trends - Southern China continues to experience high temperatures, particularly in Jiangxi, Hunan, Zhejiang, and Fujian, with forecasts indicating temperatures reaching 35-38°C from October 3 to 9 [1] - Cities like Hangzhou and Nanchang have already set records for the number of high-temperature days this year, with Hangzhou and Nanchang recording 66 and 70 days respectively [1] - Night temperatures in Jiangnan and South China are also significantly higher, with some areas reaching 27°C, nearly 10°C above the seasonal average [1] Group 2: Northern Temperature Changes - Northern regions, including North China and Northeast China, are experiencing unusually warm temperatures, with highs above 25°C and nighttime lows between 15-20°C [2] - A strong cold front is expected to bring a significant temperature drop in the north after October 5, with cities like Harbin seeing a drop from 27°C to 15°C in just two days [2] Group 3: Precipitation and Weather Events - Heavy rainfall is anticipated in the Sichuan Basin to Huanghuai and North China, with cumulative rainfall expected to reach 50-160 mm from October 2 to 5, and localized areas exceeding 250 mm [3] - Typhoon "Maidum" is forecasted to approach the coastal areas of Qiong and Guangdong, potentially making landfall around October 5, marking the ninth typhoon to hit China this year [3]