# IRI – International Research Institute for Climate and Society | A New Definition of Rainy Season Onset Dates In Vietnam Tailored to Agriculture

> IRI researchers linked the El Niño-Southern Oscillation to the timing of rainy season onset in Vietnam's Central Highlands and Mekong Delta. They defined agriculturally tailored onset dates for seven growing zones, published in the journal Atmosphere.

- Date: 2021-03-04 · published 2021-03-04T12:00:00.000Z
- Category: report · region Vietnam · magnitude low
- Page: https://feedsoft.ai/events/48025-iri-international-research-institute-for-climate-and-society-a-new-definition
- Commodities: [Corn](https://feedsoft.ai/c/CORN.md), [Soybeans](https://feedsoft.ai/c/SOY.md), [Wheat (SRW)](https://feedsoft.ai/c/WHEAT.md), [Palm Oil](https://feedsoft.ai/c/PALMOIL.md)

## Why it matters

This is a research finding that could improve forecasts for Vietnamese coffee and rice planting, but it does not show a near-term supply change for feed commodities.

## Similar past events

| Commodity | Date | Event | 5-day % | 20-day % |
| --- | --- | --- | --- | --- |
| CORN | 2020-01-21 | [IRI – International Research Institute for Climate and Society \| 2020 January Quick Look](https://feedsoft.ai/events/54989-iri-international-research-institute-for-climate-and-society-2020-january-quick.md) | -1.6% | -2.0% |
| CORN | 2018-02-13 | [Intensive agriculture influences U.S. regional summer climate, study finds \| MIT News \| Massachusetts Institute of Technology](https://feedsoft.ai/events/66347-intensive-agriculture-influences-u-s-regional-summer-climate-study-finds-mit.md) | +0.3% | +4.7% |
| CORN | 2025-11-14 | [1380. Trends in Export Restrictions on Major Crops \| Japan International Research Center for Agricultural Sciences \| JIRCAS](https://feedsoft.ai/events/21917-1380-trends-in-export-restrictions-on-major-crops-japan-international-research.md) | -0.8% | -0.3% |
| CORN | 2026-01-13 | [1415. World Food Price Trends, December 2025 \| Japan International Research Center for Agricultural Sciences \| JIRCAS](https://feedsoft.ai/events/12588-1415-world-food-price-trends-december-2025-japan-international-research-center.md) | +0.6% | +1.4% |
| CORN | 2024-01-11 | [932. December 2023 World Food Price Index \| Japan International Research Center for Agricultural Sciences \| JIRCAS](https://feedsoft.ai/events/32196-932-december-2023-world-food-price-index-japan-international-research-center.md) | -1.3% | -5.6% |
| SOY | 2020-01-21 | [IRI – International Research Institute for Climate and Society \| 2020 January Quick Look](https://feedsoft.ai/events/54989-iri-international-research-institute-for-climate-and-society-2020-january-quick.md) | -3.5% | -4.0% |
| SOY | 2018-02-13 | [Intensive agriculture influences U.S. regional summer climate, study finds \| MIT News \| Massachusetts Institute of Technology](https://feedsoft.ai/events/66347-intensive-agriculture-influences-u-s-regional-summer-climate-study-finds-mit.md) | +2.5% | +3.9% |
| SOY | 2025-11-14 | [1380. Trends in Export Restrictions on Major Crops \| Japan International Research Center for Agricultural Sciences \| JIRCAS](https://feedsoft.ai/events/21917-1380-trends-in-export-restrictions-on-major-crops-japan-international-research.md) | -0.8% | -4.9% |

## Sources

- iri.columbia.edu: https://iri.columbia.edu/news/a-new-definition-of-rainy-season-onset-dates-in-vietnam-tailored-to-agriculture/

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Data from Feedsoft AI (https://feedsoft.ai/). For information only; not investment advice.