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Flood in Middlesex County, Connecticut
35 floods and flash floods events in the NCEI Storm Events record, 1950 to 2026. Event types counted: Flood, Flash Flood, Coastal Flood, Lakeshore Flood.
NCEI notes that Storm Data is compiled from a variety of sources including the National Weather Service, other federal, state and local agencies, the media and the public; that property and crop damage figures are estimates; and that some events are recorded by NWS forecast zone rather than by county. FEMA notes that NFIP claim records are redacted and aggregated to protect the privacy of policyholders. Storm records through 30 Jun 2026.
Middlesex County, Connecticut, has 35 flood events in the NCEI record since 1950, with at least one in 15 different years.
September is the busiest month, with 7 of the recorded events. The last 20 years account for 19 events against 16 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 3.4% of the 1,033 flood events recorded in Connecticut; its 9.5 per 100 square miles compares with 21.3 statewide.
Compared with Connecticut
| Measure | Middlesex County | Connecticut | US |
|---|---|---|---|
| Flood events since 1950 | 35 | 1,033 | 183,559 |
| Per 100 square miles | 9.5 | 21.3 | 5.2 |
| Per 10,000 residents | 2.1 | 2.9 | 5.5 |
| Deaths recorded | 0 | 13 | 2,961 |
| Busiest month | September | September | June |
By year
Seasonality
4Feb
0Mar
6Apr
2May
0Jun
3Jul
5Aug
5Sep
7Oct
1Nov
0Dec
2
Recorded events
All 35 events, most recent first. Magnitude is hail size, tornado rating or wind speed as recorded.
| Date | Event type | Magnitude | Property damage | Crop damage | Deaths | Injuries | Geography |
|---|---|---|---|---|---|---|---|
| 4 Jul 2023 | Flash Flood | — | — | — | — | — | County |
| 2 Sep 2021 | Flash Flood | — | $50K | — | — | — | County |
| 9 Jul 2021 | Flash Flood | — | — | — | — | — | County |
| 25 Sep 2018 | Flash Flood | — | — | — | — | — | County |
| 25 Sep 2018 | Flash Flood | — | — | — | — | — | County |
| 25 Sep 2018 | Flash Flood | — | — | — | — | — | County |
| 25 Sep 2018 | Flash Flood | — | — | — | — | — | County |
| 25 Sep 2018 | Flash Flood | — | — | — | — | — | County |
| 11 Aug 2016 | Flash Flood | — | — | — | — | — | County |
| 11 Aug 2016 | Flash Flood | — | — | — | — | — | County |
| 10 Aug 2012 | Flash Flood | — | — | — | — | — | County |
| 8 Jul 2011 | Flash Flood | — | — | — | — | — | County |
| 8 Jul 2011 | Flash Flood | — | $250K | — | — | — | County |
| 30 Mar 2010 | Flood | — | $315K | — | — | — | County |
| 30 Mar 2010 | Flood | — | $5K | — | — | — | County |
| 3 Jul 2009 | Flash Flood | — | — | — | — | — | County |
| 12 Dec 2008 | Flood | — | — | — | — | — | County |
| 12 Dec 2008 | Flood | — | — | — | — | — | County |
| 2 Mar 2007 | Flash Flood | — | — | — | — | — | County |
| 28 Oct 2006 | Flash Flood | — | — | — | — | — | County |
| 2 Jun 2006 | Flash Flood | — | — | — | — | — | County |
| 20 Aug 2001 | Flood | — | — | — | — | — | County |
| 17 Jun 2001 | Flood | — | — | — | — | — | County |
| 30 Mar 2001 | Flood | — | — | — | — | — | County |
| 22 Mar 2001 | Flash Flood | — | — | — | — | — | County |
| 16 Sep 1999 | Flash Flood | — | — | — | — | — | County |
| 15 Jan 1999 | Flash Flood | — | — | — | — | — | County |
| 17 Aug 1998 | Flash Flood | — | — | — | — | — | County |
| 19 Jun 1998 | Flash Flood | — | — | — | — | — | County |
| 9 Mar 1998 | Flash Flood | — | — | — | — | — | County |
| 24 Jan 1998 | Flash Flood | — | — | — | — | — | County |
| 16 Apr 1996 | Flash Flood | — | — | — | — | — | County |
| 16 Apr 1996 | Flash Flood | — | — | — | — | — | County |
| 27 Jan 1996 | Flood | — | — | — | — | — | County |
| 12 Jan 1996 | Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Middlesex County had?
35 events in the NCEI Storm Events record between 1950 and 2026. Reporting of floods and flash floods became far more complete after 1996, so early decades undercount.
When was the last recorded flood event in Middlesex County?
4 Jul 2023 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Middlesex County?
The flood of 30 Mar 2010, with property damage estimated by NCEI at $315K.
How does Middlesex County compare with Connecticut for flood?
9.5 events per 100 square miles against 21.3 statewide; the county holds 35 of the state's 1,033 recorded events.
Provenance
NOAA NCEI Storm Events Database, yearly details files through 30 Jun 2026, public domain. County-recorded events plus zone-recorded events whose forecast zone is named for the county (marked "Forecast zone"). Population and area from the US Census Bureau (2021). Built 1 Oct 2026. See the methodology, the Flood hub and the county page.