3 months ago
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Kerala has crushed to interest astir progressively erratic monsoon behaviour, arsenic its mean seasonal rainfall during some the southwest and northeast monsoons has shown a dependable diminution implicit the past 125 years, according to a study by the Institute for Climate Change Studies (ICCS).
ICCS scientists said that Kerala’s mean rainfall during the southwest (June-September) and northeast (October-December) monsoons, the State’s superior sources of precipitation, decreased by 12.5% and 6.1% of the long-period mean (LPA, 1971–2020) per 100 years, respectively, betwixt 1901 and 2025.
While the LPA for southwest monsoon rainfall successful Kerala is 1,919.3 mm, the LPA for northeast is 478.1 mm.
The information, released arsenic portion of the ‘Statement connected Climate for the State of Kerala: 2025’, said the mean southwest monsoon rainfall during 1901–2025 showed a decreasing inclination successful each districts but Idukki.
Nine districts, Kottayam, Alappuzha, Kollam, Pathanamthitta, Kannur, Wayanad, Kozhikode, Malappuram, and Palakkad, reported a “significantly decreasing” trend, portion Ernakulam, Thrissur, and Kasaragod showed a “decreasing” pattern. In Idukki, an “insignificant increasing” inclination was observed.
In the lawsuit of the northeast monsoon, decreasing seasonal rainfall was recorded successful each districts but Kasaragod, with “significantly decreasing” trends observed successful Wayanad, Palakkad, and Kottayam. Kasaragod showed an “insignificant increasing” trend.
“Though clime alteration is planetary successful nature, its consequences are highly region-specific. The trends we are observing successful Kerala item however planetary clime shifts tin manifest otherwise crossed regions. Given the State’s unsocial geography, monsoon dependence, and socio-economic structure, adjacent humble semipermanent changes successful rainfall patterns tin person important implications,” said Sinan Nizar, inferior scientist, ICCS.
Although the State received 2,925.7 mm of yearly rainfall successful 2025, a departure of +1.2% from the LPA, officials said the mean rainfall during the southwest and northeast monsoons stood astatine 87% and 79%, respectively, of the LPA.
During the southwest monsoon, 3 districts, Wayanad (-36%), Idukki (-35%), and Malappuram (-27%), reported importantly below-average rainfall. In contrast, the northeast monsoon was markedly beneath mean crossed the State, with 8 of the 14 districts signaling deficient rainfall. The sharpest deficits were observed successful Kollam (-32%) and Malappuram (-33%), followed by Idukki (-26%), Kozhikode (-24%), and Palakkad (-24%).
Despite the semipermanent diminution successful mean rainfall during some monsoon seasons, Kerala remains prone to utmost precipitation swings. The twelvemonth 2023 emerged arsenic 1 of the driest successful caller past owed to a crisp southwest monsoon deficit, successful stark opposition to 2018, which witnessed excess rainfall and devastating floods.
