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🇨🇦 Canada Weather Network Audit

An independent research project monitoring Environment Canada's weather station infrastructure

⚠️ SEPTEMBER 2026 UPDATE: 136 stations left ECCC's inventory between the July 18 and September 24 audits — all of them in Alberta, 88% of them agricultural (AGCM/AGDM) stations. ECCC and Alberta Agriculture and Irrigation have confirmed in writing that the Government of Alberta's historical data was deliberately removed from the federal archive in Aug/Sep 2026; access is now via Alberta's ACIS.
NATIONAL OVERVIEW

🇨🇦Canada Precipitation Network Reliability Report — 2026

81.2%
Stations Decommissioned
8,374
Stations in ECCC Inventory
1 in 4
Active Stations Failing

Scope: 12 provinces and territories — full national assessment
Coverage: 10,261,304 daily records across 1,434 stations over 36 years
Key finding: 101 ghost stations. Zero EXCELLENT-rated stations in NWT or Nunavut. 82% of canonical reference city stations decommissioned — including Calgary, Edmonton, Vancouver, Winnipeg, Toronto, Halifax, and Regina.
Published: May 16, 2026 — 64 pages

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INVENTORY EVENT — CONFIRMED

🌾September 2026 — The Alberta Transfer

136
Stations Left the Inventory — All Alberta
−57%
Alberta Functional Stations (212 → 92)
0
Reclassifications Among 8,197 Common Stations

Scope: Full-inventory comparison of the July 18 and September 24, 2026 audits — 8,333 vs 8,198 stations. Yukon does not appear in either audit.
Key finding: The national network was frozen everywhere except Alberta. 120 of the 136 departed stations carry the AGCM/AGDM agricultural designation; 124 reported daily data as recently as 2024. Alberta's decommissioned count was essentially unchanged — the stations did not pass through the normal decommissioning path.
Confirmed: ECCC (Applied Climatology Services, West) and Alberta Agriculture and Irrigation confirmed in writing that the Government of Alberta's historical data was removed from the federal archive in Aug/Sep 2026 over quality-control version divergence, with Alberta's ACIS as the designated source. A federal retrieval test shows 0 of 136 departed stations now return data from ECCC's historical-data service.
Evidence: Full report with agency confirmations, the 136-station list, retrieval-test log, figures (EN/FR), and the audit notebook — in the september-2026 folder on GitHub (link below).

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REPRODUCTION RUN

🍁July 2026 — National Reproduction

24.2%
Effective Failure Rate
8,333
Stations Audited
371
Problematic
🐻‍❄️ NWT
43.9%
29 problematic / 66 active
❄️ Nunavut
43.4%
36 problematic / 83 active
🧊 Newfoundland
37.1%
26 problematic / 70 active
⚜️ Quebec
34.4%
99 problematic / 288 active

Scope: Full 12-province ECCC inventory — 8,333 stations. Yukon does not appear in this audit.
Methodology: Identical notebook and parameters to the May 2026 run — ECCC 5-category classification per Minister Dabrusin's response. Audit dates: 17–18 July 2026.
Key finding: Zero reclassifications. Of the 8,330 stations present in both the May and July audits, none moved between categories in either direction. The effective failure rate rose from 23.5% to 24.2% entirely through inventory turnover: 44 stations left ECCC's inventory and 3 entered. Forty-two of the 44 departures were Alberta stations classified functional in May; 31 carried the AGCM agricultural designation. NWT (43.9%) and Nunavut (43.4%) remain the worst-performing jurisdictions.

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REPRODUCTION RUN

🍁May 2026 — National Reproduction

23.5%
Effective Failure Rate
8,374
Stations Audited
370
Problematic
🐻‍❄️ NWT
43.9%
29 problematic / 66 active
❄️ Nunavut
43.4%
36 problematic / 83 active
🧊 Newfoundland
37.1%
26 problematic / 70 active
⚜️ Quebec
34.1%
98 problematic / 287 active

Scope: Full 12-province ECCC inventory — 8,374 stations
Methodology: Identical to April 2026 national report — ECCC 5-category classification per Minister Dabrusin's response
Key finding: The April 2026 national findings reproduce in full one month later. 370 stations remain classified as ACTIVE_TRANSMISSION_ISSUE; effective failure rate among the 1,577 non-decommissioned stations holds at 23.5%. NWT (43.9%) and Nunavut (43.4%) remain the worst-performing jurisdictions, with zero EXCELLENT-rated stations in either. The pattern is structurally persistent — not a one-month artifact.

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🍁April 2026

21.2%
Effective Failure Rate
5,805
Stations Audited
228
Problematic
⚜️ Quebec
34.1%
98 problematic / 287 active
🍁 Ontario
22.6%
48 problematic / 212 active
🌊 British Columbia
16.9%
49 problematic / 290 active
🌾 Alberta
11.5%
33 problematic / 287 active

Scope: Ontario • Quebec • Alberta • British Columbia (Full ECCC Inventory — 5,805 stations)
Methodology: ECCC 5-category classification per Minister Dabrusin's response
Key finding: Quebec remains worst at 34.1% (98 stations). British Columbia added for the first time: 49 problematic stations at 16.9% failure rate. Ontario stable at 48 stations (22.6%). Alberta unchanged at 33 stations (11.5%). All 228 classified as ACTIVE_TRANSMISSION_ISSUE — stations ECCC considers operational yet failing to deliver reliable precipitation records.

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🍁March 2026

22.7%
Effective Failure Rate
4,058
Stations Audited
178
Problematic
⚜️ Quebec
34.1%
98 problematic / 287 active
🍁 Ontario
22.3%
47 problematic / 211 active
🌾 Alberta
11.5%
33 problematic / 287 active

Scope: Ontario • Quebec • Alberta (Full ECCC Inventory — 4,058 stations)
Methodology: ECCC 5-category classification per Minister Dabrusin's response
Key finding: Quebec 34.1% failure — worst of three provinces. Zero improvement in Ontario (47) and Quebec (98) since February 2026. Alberta added for the first time: 33 problematic stations in the agricultural belt (Peace River, Red Deer corridor, Lethbridge). All 178 classified as ACTIVE_TRANSMISSION_ISSUE — stations ECCC considers operational yet failing to deliver reliable precipitation records.

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🍁February 2026

29.1%
Effective Failure Rate
2,594
Stations Audited
145
Problematic

Scope: Ontario • Quebec (Full ECCC Inventory)
Methodology: ECCC 5-category classification per Minister Dabrusin's response
Finding: Quebec 34.1% failure vs Ontario 22.3% — 145 stations referred to NIRT

📍 View Interactive Map → V1 — SUPERSEDED

🍁January 2026

83.1%
Failure Rate (V1)
4,214
Stations Tested
3,500
Offline

Scope: Alberta • Ontario • Quebec
Finding: Initial baseline audit — Ontario at 88.9%, Alberta at 82.0%, Quebec at 75.8%
Methodology note: V1 did not separate decommissioned stations from active failures. Superseded by V2 (February 2026 onward), which applies ECCC's five-category classification framework and reports the effective failure rate across the operational network only. For current methodology and findings, see the April 2026 report above.

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🍁December 2025

69.9%
Failure Rate
2,594
Stations Tested
1,812
Offline

Scope: Ontario • Quebec
Finding: Initial audit establishing baseline — system-wide collapse documented

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✉️ Contact 🔗 LinkedIn 📂 September 2026 Evidence (GitHub) 🔒 Privacy

Adrian Hernandez-del-Valle, PhD

Windrose — an independent research project

Data source: Environment Canada MSC Datamart & Collaboration Server

Methodology: ECCC 5-category classification per Minister Dabrusin's January 2026 response

© 2026 Adrian Hernandez-del-Valle — windrose.news — Montréal, Québec, Canada