Previous observational analyses have shown a declining rainfall trend over Israel, mostly statistically insignificant. The current study, for the period 1975–2020, undermines these findings, and the alarming future projections, and elaborates other ingredients of the rain regime. No trend is found for the annual rainfall, reflecting a balance between a negative trend in the number of rainy days and a positive trend in the daily rainfall intensity, both on the order of 2.0%/decade. In the mid-winter, the rainfall and the daily intensity increased, while both declined in the autumn and spring, implying a contraction of the rainy season. The time span between accumulation of 10% and 90% of the annual rainfall, being 112 days on the average, shortened by 7 days during the study period. This is also expressed by an increase of the Seasonality Index, indicating that the regional climate is shifting from “markedly seasonal with a long dry season” to “most rain in ≤3 months.” The intra-seasonal course of the rainfall trend corresponds to that of the occurrence and intensity of the Cyprus Lows and the Mediterranean Oscillation. The contraction of the rainy season and the increase in the daily intensity have far-reaching environmental impacts in this vulnerable region.

先前的观测分析表明，以色列的降雨量呈下降趋势，在统计上大多不显着。当前的 1975 年至 2020 年期间的研究破坏了这些发现和令人担忧的未来预测，并阐述了雨情的其他成分。年降雨量未发现趋势，反映了雨天数呈负趋势和日降雨强度呈正趋势之间的平衡，均在 2.0%/十年的数量级。隆冬时节，降雨量和日强度增加，而秋、春季节均有所下降，表明雨季有所减少。年降水量10%～90%的累积时间平均为112天，研究期间缩短了7天。这也表现为季节性指数的增加，表明区域气候正在从“季节性显着、旱季长”转变为“≤3个月降雨最多”。降雨趋势的季节性过程对应于塞浦路斯低气压和地中海涛动的发生和强度。雨季的缩短和日照强度的增加对这一脆弱地区的环境产生了深远的影响。