Delaware Power Outage Season
When outages happen most in Delaware, and what to expect.
July is historically Delaware's busiest month for recorded power outages, part of a summer season (June–August) that accounts for about 35% of all recorded outages statewide, averaging 1.8 hours per event.
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Delaware outages by month
Total recorded events and average duration per event, summed across every tracked county in Delaware.
Peak season insight
Delaware's outage season runs June–August, accounting for 35% of all recorded outages. July has the highest frequency.
Month-by-month data table
| Month | Events | Avg duration |
|---|---|---|
| January | 312 | 2.1 hrs |
| February | 263 | 1.6 hrs |
| March | 294 | 2.2 hrs |
| April | 312 | 1.8 hrs |
| May | 365 | 1.7 hrs |
| June | 481 | 1.8 hrs |
| July | 554 | 2.0 hrs |
| August | 540 | 2.0 hrs |
| September | 407 | 1.6 hrs |
| October | 374 | 1.7 hrs |
| November | 338 | 1.6 hrs |
| December | 294 | 1.8 hrs |
This month in Delaware
October has historically recorded 374 outage events across Delaware, below the state's typical monthly average. Outages that start in October have averaged 1.7 hours.
Main causes by season
Named storms behind Delaware's worst recorded outages, from the NOAA Storm Events Database.
Winter (December–February)
- Dense Fog
- Cold/Wind Chill
Spring (March–May)
- High Wind
- Winter Weather
- Thunderstorm Wind
Summer (June–August)
- Heat
- Thunderstorm Wind
- Astronomical Low Tide
- Tropical Storm Isaias
Fall (September–November)
- Heavy Rain
Delaware's worst outage events on record
The five largest outages in Delaware by duration and customers affected.
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Mar 2, 2018 | 82 hrs | 44,559 (17%) | High Wind |
| Mar 14, 2017 | 61 hrs | 33,074 (13%) | Winter Weather |
| Aug 4, 2020 | 34 hrs | 34,852 (12%) | Tropical Storm Isaias |
| Jun 23, 2015 | 20 hrs | 45,881 (18%) | Heat |
| Dec 12, 2023 | 6 hrs | 61,872 (24%) | Dense Fog |
Highest-risk counties in Delaware
Lowest reliability percentile among Delaware's tracked counties.
| County | Grade | National percentile |
|---|---|---|
| New Castle County | B | 64th |
| Sussex County | A | 90th |
| Kent County | A | 91st |
Live weather alerts for Delaware
There are no active National Weather Service alerts for Delaware right now.
These live alerts come from the National Weather Service. They are public-safety information, not an outage prediction.
Delaware power outage FAQ
When do power outages happen most in Delaware?
July is historically the busiest single month for recorded outages in Delaware, and Summer (June–August) accounts for about 35% of all recorded outages across the state.
How long do power outages in Delaware typically last?
Across Delaware's tracked counties, the average recorded outage lasts about 1.8 hours, though individual events -- especially named storms -- can run much longer.
Which counties in Delaware have the highest outage risk?
New Castle County, Sussex County, Kent County currently rank lowest for reliability in Delaware. See each county's page for its full history.
Does this page predict a power outage in Delaware?
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 Delaware's outage season
Sized for Delaware's recorded outage frequency and duration.
