Core Viewpoint - The weather in Hangzhou is experiencing significant fluctuations, with a warm spell followed by a strong cold front expected to bring rain and snow, impacting local conditions and transportation. Group 1: Current Weather Conditions - On February 3, the maximum temperature in Hangzhou reached 12.4℃, indicating a warming trend [1] - February 4 marks the beginning of the spring season, with temperatures expected to rise to 18℃ due to a shift in wind direction [1] - By February 4-5, temperatures across the province will continue to rise, with some areas potentially exceeding 20℃ [1] Group 2: Upcoming Cold Front - A strong cold air mass is expected to move southward, leading to a significant drop in temperatures and the possibility of rain and snow from February 5-7 [2] - Rain is forecasted to begin on Thursday night, with snow expected in central and northern Zhejiang, particularly in high-altitude areas [2] - The cold air mass is anticipated to bring a temperature drop of 10-12℃, with the coldest temperatures occurring on the mornings of February 8 and 9 [3] Group 3: Impact of Weather Changes - The temperature in Hangzhou is projected to drop from around 18℃ on Thursday to single digits by Friday, with daytime highs of only 6-8℃ and lows between -1 to 2℃ [3] - The cold wave will affect a large portion of central and eastern China, potentially impacting transportation during the Spring Festival travel period [3] - Increased pollution levels are expected due to the cold air mass, which may lead to higher concentrations of local pollutants [3]

Core Viewpoint - March 2023 has seen unprecedented temperature fluctuations in various Chinese cities, with some regions experiencing record high temperatures followed by significant drops due to a cold wave, indicating unusual weather patterns for this time of year [1][2][20]. Group 1: Temperature Records - Shanghai recorded temperatures exceeding 30°C on March 25, breaking the record for the earliest occurrence of such temperatures since 1933, which typically happens in late April to early May [1]. - Over the past 74 years, several provincial capitals have set new high-temperature records in March, with cities like Lanzhou, Shenyang, and Fuzhou achieving this in recent years [13][20]. Group 2: Temperature Fluctuations - In March 2023, 20 provincial capitals experienced temperature variations that spanned across four seasons, with daily maximum temperatures fluctuating by as much as 10°C to over 22°C within the month [2]. - The most significant single-day temperature drop was recorded in Hefei, where temperatures fell by over 20°C in a short period, highlighting the extreme nature of this year's weather [13][16]. Group 3: Cold Wave Impact - A cold wave is expected to cause temperature drops exceeding 20°C in several cities, including Nanchang, Hangzhou, and Wuhan, following a period of unusually warm weather [16]. - Historical data indicates that occurrences of temperature drops exceeding 20°C within 48 hours in March are rare, with only a few cities like Guiyang having experienced this more than ten times in the past 74 years [20].