74年数据告诉你，3月多地气温上演“满30减20”有多反常

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].