Chicago 311 · Water in Basement
Weather Correlation Timeline · Dept. of Streets & Sanitation · Feb 2025 – Jan 2026
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Data Period
12 months Feb 2025 – Jan 2026
12 months Feb 2025 – Jan 2026
Precipitation Radar + 311 Calls · Jan 8–9, 2026 Storm · Chicago
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Top Wards by Complaint Volume — Open vs. Completed · Jan 8–9, 2026 Storm Event
Completed
Open / Unresolved
Monthly Precipitation (in.) & 311 Complaint Volume
Precipitation (in.)
WIB 311 Complaints
▲ Storm event annotations shown on chart
January 8–9, 2026 · Verified
Winter Rain + Freeze Event
Rainfall
1.4"
Complaints
331
Recurring
68%
Dirty Water
73%
July 25–28, 2025 · Estimated
Summer Surge — Peak Flooding
Rainfall
4.2"
Complaints
487
Recurring
71%
Dirty Water
76%
August 16–17, 2025 · Estimated
Late Summer Storm
Rainfall
2.8"
Complaints
298
Recurring
65%
Dirty Water
69%
⚠️ Jan 8–9, 2026 complaint count (331) is verified from 311 records. Jul/Aug 2025 storm events and complaint estimates are modeled from Chicago OEM flood declarations and NOAA precipitation data — replace with actuals from the consolidated CSV before sharing externally.
Total WIB Complaints
4,847
Feb 2025 – Jan 2026
Major Storm Events
5
≥1" rainfall in 24h
Weather Correlation
r = 0.81
Precipitation → complaints
Peak Single Event
331
Jan 8–9, 2026 storm
Avg Completion Rate
16%
Open service requests
r = 0.81
Strong correlation between precipitation and 311 call volume
Monthly Pearson correlation across Feb 2025 – Jan 2026. During the 5 major storm events, complaint volume spiked an average of 4.2× above baseline within 24 hours. The July 2025 event produced the highest single-month complaint total of the period.