{"access":"sample","sample":true,"sample_size":12,"observations_total":142,"signal":"illinois-dry-fall-anhydrous-ammonia-window-2026","key":"il-pdsi","family":"PHYSICAL","variable":"Illinois statewide Palmer Drought Severity Index, monthly (NOAA NCEI Climate at a Glance, nClimDiv)","unit":"index (negative = drought)","geography":"US-IL","publisher":"noaa-ncei","source_url":"https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/11/pdsi/1/0/2015-2026/data.csv","source_sha256":"8ed9e9d61d4c73ef816392b54a498d8f9f90455a1a2ba4b3a7eee5450120694a","collected_at":"2026-11-09T18:59:34+01:00","period_grain":"month","derived":null,"rights":"PUBLIC_DOMAIN","publisher_name":"NOAA National Centers for Environmental Information","licence":"U.S. federal government work (17 U.S.C. §105). The nClimDiv dataset record behind Climate at a Glance states as its only use constraints a citation (\"Cite as: Vose, Russell S.; ... (2014): NOAA Monthly U.S. Climate Divisional Database (NClimDiv) ... doi:10.7289/V5M32STR\") and a liability disclaimer (\"NOAA and NCEI make no warranty...\"); no restriction on reuse.","licence_evidence_url":"https://www.ncei.noaa.gov/access/metadata/landing-page/bin/iso?id=gov.noaa.ncdc:C00005","licence_checked_at":"2026-11-04","observations_withheld":false,"observations":[{"period":"2025-11","value":-2.26},{"period":"2025-12","value":-2.83},{"period":"2026-01","value":-3.25},{"period":"2026-02","value":-3.92},{"period":"2026-03","value":-3.59},{"period":"2026-04","value":0.58},{"period":"2026-05","value":0.05},{"period":"2026-06","value":1.26},{"period":"2026-07","value":0.98},{"period":"2026-08","value":1.77},{"period":"2026-09","value":1.31},{"period":"2026-10","value":0.56}]}