5月我国气温偏高 降水总体略偏多但分布不均

Summary of Key Points Core Viewpoint - The National Climate Center reported that May 2023 experienced higher temperatures and uneven rainfall across China, with significant weather events impacting various regions, including droughts and extreme heat conditions. Temperature Characteristics - The average national temperature in May was 17.1°C, which is 0.9°C higher than the same period in previous years. Most regions experienced temperatures close to or above historical averages, with some areas in Central and Western China exceeding by 2-4°C. Notably, Henan and Shaanxi recorded their highest average temperatures since 1961, with 287 weather stations reporting record high temperatures for spring [1]. Rainfall Patterns - The national average precipitation was 63.4 mm, which is 3.8% more than the historical average. Certain regions, including parts of Northeast China and Southern China, saw rainfall increase by 20% to 200%, while other areas experienced a decrease of 20% to 90%. Beijing recorded its highest rainfall for this period since 1961, with significant records also in Tibet and Guizhou [2]. Drought Conditions - Drought conditions developed in regions such as Shaanxi, Gansu, and Henan, despite earlier rainfall alleviating drought in Southern China. Currently, areas in Northwest China and Central China are experiencing moderate to severe drought, impacting agriculture and local livelihoods [2]. Extreme Weather Events - The first heatwave of the year occurred from May 19-21, affecting several regions, with extreme temperatures recorded at 43.2°C in Linzhou, Henan. This heatwave, combined with dry winds, adversely affected wheat development [3]. Severe Weather Incidents - There were six instances of severe convective weather and four dust storm events throughout May, surpassing the historical average of 2.7 occurrences from 2000 to 2024. The dust storm on May 8-9 reached severe levels, impacting air quality and visibility [3].