Group 1 - The early arrival of spring in Sichuan, with meteorological spring starting on February 13, is 18 days earlier than the average, impacting agricultural activities [1] - Farmers in Yibin City are actively preparing for the planting season, with many starting their tasks earlier than usual, although some farmers report that the timing remains similar to previous years [1] - Agricultural experts warn of potential indirect impacts from the early spring, including increased pest and disease risks due to a dry winter and poor soil moisture conditions affecting crop emergence [1] Group 2 - Experts advise farmers to be cautious of potential late spring cold snaps that could lead to diseases like damping-off, emphasizing the need for protective measures [2] - Meteorological forecasts indicate a likelihood of significant temperature drops in late March, which could result in late spring cold events [2] - Farmers are encouraged to utilize favorable weather for land preparation and moisture retention, and to consider techniques like plastic film covering to mitigate the effects of potential cold snaps [2]

Group 1 - The article discusses the early arrival of spring in Chengdu, with the city officially entering spring on February 13, which is 18 days earlier than the average date and the fourth earliest since 2000 [1] - The average temperature in Chengdu for March is predicted to be 13.5°C, which is 0.9°C higher than the historical average for the same period [1] - There is a forecast for a significant drop in temperature towards the end of March, indicating a potential for a late cold snap, commonly referred to as "倒春寒" [1]

Core Viewpoint - The article discusses the risks posed by "late spring cold" to wheat production in the context of changing weather patterns, emphasizing the need for proactive measures to ensure stable yields. Group 1: Weather Impact on Wheat - The early spring is predicted to face significant risks of strong cold spells, with higher temperatures and lower precipitation expected, potentially leading to an earlier green-up period for winter wheat and increased risks of "late spring cold" and spring drought [1] - "Late spring cold" refers to sudden drops in temperature below 0°C during the warming period from February to April, which can severely damage wheat crops [1][2] - The frequency and severity of "late spring cold" events have increased in recent years due to global climate change, with historical sayings indicating that such events can lead to significant yield reductions [1] Group 2: Recommendations for Farmers - Farmers are advised to closely monitor weather changes and prepare preventive measures against "late spring cold," especially given the high proportion of late-sown wheat with poor root development and low resistance to cold [2] - Specific recommendations include focusing on preemptive measures, enhancing weak seedlings' growth, and managing soil moisture effectively to mitigate the impact of cold spells [2] - In case of damage from "late spring cold," farmers should assess the extent of frost damage and apply fertilizers accordingly to promote recovery, as wheat has the ability to regrow from high-position buds even after frost [2][3] Group 3: Nutritional Management and Pest Control - Farmers should enhance nutrient management through foliar applications of fertilizers to support plant recovery after frost damage [3] - Increased vulnerability to pests and diseases following frost necessitates close monitoring and timely application of appropriate pesticides, avoiding treatments during low-temperature, high-humidity conditions [3] - Effective scientific management and precise strategies can help mitigate the risks of "late spring cold" and support stable wheat production [3]

Core Viewpoint - The current winter season is experiencing unusual weather patterns, with a warm period followed by a strong cold wave, leading to expectations that this year's "Dahan" (Major Cold) may be colder than "Xiaohan" (Minor Cold) [1] Group 1: Weather Patterns - This winter has shown a rare "warm background" prior to the cold wave, with significant temperature increases during Xiaohan, where many weather stations broke historical records for mid-January temperatures [1] - For example, on January 15, about 10% of national weather stations set new records for mid-January, with over 100 stations breaking historical records for the month [1] - In Hefei, Anhui, temperatures exceeded 20°C for three consecutive days, an unprecedented occurrence for this time of year [1] Group 2: Regional Temperature Variations - Different regions are experiencing varying temperatures; northern areas like North China and Northeast China are expected to become colder during Dahan, while southern regions like Jiangnan and South China will see only slight temperature increases [2] Group 3: Long-term Climate Trends - Long-term meteorological data from 1991 to 2020 indicates that "Xiaohan is colder than Dahan" is the norm, with average temperatures during Xiaohan reaching a low of -5.0°C, compared to -4.5°C during Dahan [3] - This trend has been stable since systematic meteorological records began in the 1950s, with the exception of the 1970s when Dahan was slightly warmer by 0.02°C [3] - Notably, 23 provinces and regions experience colder temperatures during Xiaohan, while eight areas, including Jiangsu and Guangdong, are exceptions where Dahan is colder due to geographical factors [3] Group 4: Post-Dahan Weather Expectations - After Dahan, a warming trend is expected, with average temperatures rising to -1.9°C as spring approaches, although cold weather may still occur [4] - There is a possibility of cold wave events even after the start of spring, influenced by global warming and changes in atmospheric circulation [4] - It is advised to remain cautious and not to prematurely reduce winter clothing, as actual weather conditions should dictate clothing choices rather than relying solely on seasonal markers [4]

Group 1 - The recent cold wave has significantly impacted temperatures across Zhejiang, with the highest temperature in Hangzhou only reaching 11.2℃ and some areas experiencing single-digit highs [1] - The weather is expected to improve starting Monday, with temperatures gradually rising above 20℃ by Tuesday, allowing for outdoor activities [1] - Despite the warming trend, early morning temperatures will remain low, with minimums in the plains at 4-8℃ and in mountainous areas at 2-4℃, leading to a temperature difference of up to 15℃ between morning and afternoon [1] Group 2 - The recent temperature drop does not qualify as "late spring cold" according to Zhejiang's definition, which requires a sustained period of low average temperatures after early April [1] - Predictions indicate a shift in weather patterns around the Qingming Festival, with warmer air masses gaining dominance and a reduction in the likelihood of significant cold waves in the near future [2] - The upcoming weather is expected to feature more frequent warm temperatures in the north and increased rainfall in the south, although some cooling may still occur [2] Group 3 - As the weather improves, there is an increased fire risk, particularly with the approach of the Qingming Festival, highlighting the need for caution regarding fire and electrical safety [3]