Connecticut Power Outage Season
When outages happen most in Connecticut, and what to expect.
July is historically Connecticut's busiest month for recorded power outages, part of a summer season (June–August) that accounts for about 33% of all recorded outages statewide, averaging 2.8 hours per event. 4 of Connecticut's 17 tracked counties currently carry a Reliability Grade of F.
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Connecticut outages by month
Total recorded events and average duration per event, summed across every tracked county in Connecticut.
Peak season insight
Connecticut's outage season runs June–August, accounting for 33% of all recorded outages. July has the highest frequency.
Month-by-month data table
| Month | Events | Avg duration |
|---|---|---|
| January | 939 | 1.9 hrs |
| February | 865 | 3.3 hrs |
| March | 1,138 | 3.6 hrs |
| April | 956 | 2.2 hrs |
| May | 959 | 2.3 hrs |
| June | 1,411 | 2.0 hrs |
| July | 1,774 | 3.3 hrs |
| August | 1,403 | 2.6 hrs |
| September | 1,164 | 1.9 hrs |
| October | 1,193 | 3.4 hrs |
| November | 1,147 | 2.5 hrs |
| December | 1,122 | 4.7 hrs |
This month in Connecticut
October has historically recorded 1,193 outage events across Connecticut, above the state's typical monthly average. Outages that start in October have averaged 3.4 hours.
Main causes by season
Named storms behind Connecticut's worst recorded outages, from the NOAA Storm Events Database.
Winter (December–February)
- High Wind
- Heavy Snow
- Thunderstorm Wind
Spring (March–May)
- Hail
- Thunderstorm Wind
- Winter Weather
- High Wind
- Tornado
Summer (June–August)
- Tropical Storm Isaias
- Heat
- Thunderstorm Wind
- Hurricane Isaias
Fall (September–November)
- High Wind
- Tropical Storm Phillipe
- Strong Wind
Connecticut's worst outage events on record
The five largest outages in Connecticut by duration and customers affected.
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Aug 4, 2020 | 204 hrs | 190,956 (61%) | Tropical Storm Isaias |
| Aug 4, 2020 | 174 hrs | 179,370 (31%) | Tropical Storm Isaias |
| Aug 4, 2020 | 177 hrs | 140,925 (37%) | Hurricane Isaias |
| Aug 4, 2020 | 182 hrs | 66,462 (65%) | Tropical Storm Isaias |
| Aug 4, 2020 | 172 hrs | 50,926 (54%) | Hurricane Isaias |
Highest-risk counties in Connecticut
Lowest reliability percentile among Connecticut's tracked counties.
| County | Grade | National percentile |
|---|---|---|
| Windham County | F | 15th |
| Litchfield County | F | 18th |
| New London County | F | 19th |
| Fairfield County | F | 19th |
| Middlesex County | D | 21st |
Live weather alerts for Connecticut
There are no active National Weather Service alerts for Connecticut right now.
These live alerts come from the National Weather Service. They are public-safety information, not an outage prediction.
Connecticut power outage FAQ
When do power outages happen most in Connecticut?
July is historically the busiest single month for recorded outages in Connecticut, and Summer (June–August) accounts for about 33% of all recorded outages across the state.
How long do power outages in Connecticut typically last?
Across Connecticut's tracked counties, the average recorded outage lasts about 2.8 hours, though individual events -- especially named storms -- can run much longer.
Which counties in Connecticut have the highest outage risk?
Windham County, Litchfield County, New London County, Fairfield County, Middlesex County currently rank lowest for reliability in Connecticut. See each county's page for its full history.
Does this page predict a power outage in Connecticut?
No. It describes patterns in recorded county-level outage history, not a guaranteed future event. Check the live National Weather Service alerts below for current conditions.
Prepare for Connecticut's outage season
Sized for Connecticut's recorded outage frequency and duration.
