Demeter Pistachio Season Index
California pistachio seasonal conditions index
What DPSI tracks
The Demeter Pistachio Season Index (DPSI) is a weather-derived index that tracks growing conditions across California's pistachio-producing regions. It is the pistachio counterpart to the Almond Season Index (DASI), built on the same observable, continuously-available, spatially-explicit framework.
DPSI is currently in calibration. Backtest data is available from 2000 onwards. Live releases are scheduled to begin Q3 2026.
A DPSI value of 100 indicates conditions in line with the long-term historical average. Values above 100 indicate more favourable conditions; values below 100 indicate less favourable conditions.
Frequently asked questions
What is DPSI?
The Demeter Pistachio Season Index (DPSI) is a weather-derived index that tracks growing conditions across California's pistachio-producing regions. It is the pistachio counterpart to DASI for almonds, and uses the same construction principles — observable meteorological data, near-universal spatial coverage, and a base-100 relative scale.
When will DPSI go live?
DPSI is currently in calibration with backtest data covering 2000 onwards. Live releases are scheduled to begin Q3 2026. To be notified when DPSI goes live, sign up for our newsletter.
How will DPSI compare to DASI?
DPSI uses the same framework as DASI but is parameterised for pistachio phenology. Pistachios are a long-cycle alternate-bearing tree crop with very different chilling and heat-unit requirements to almonds, so the variable weights and stage definitions differ materially.
How can I access DPSI data?
Backtest series and methodology preview are available to Demeter subscribers via the Demeter platform. For research and licensing enquiries please contact the index team.
Will DPSI cover regions outside California?
California is the dominant origin globally. Pistachio coverage in Iberia and the Middle East is on the roadmap subject to data availability.