Maryland Power Outage Season
When outages happen most in Maryland, and what to expect.
July is historically Maryland's busiest month for recorded power outages, part of a summer season (June–August) that accounts for about 36% of all recorded outages statewide, averaging 2.2 hours per event.
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Maryland outages by month
Total recorded events and average duration per event, summed across every tracked county in Maryland.
Peak season insight
Maryland's outage season runs June–August, accounting for 36% of all recorded outages. July has the highest frequency.
Month-by-month data table
| Month | Events | Avg duration |
|---|---|---|
| January | 1,791 | 2.4 hrs |
| February | 1,679 | 2.7 hrs |
| March | 2,186 | 2.4 hrs |
| April | 2,015 | 2.3 hrs |
| May | 2,492 | 2.1 hrs |
| June | 3,372 | 2.1 hrs |
| July | 3,923 | 2.3 hrs |
| August | 3,179 | 2.4 hrs |
| September | 2,416 | 1.8 hrs |
| October | 2,295 | 1.8 hrs |
| November | 1,964 | 2.1 hrs |
| December | 1,861 | 2.4 hrs |
This month in Maryland
October has historically recorded 2,295 outage events across Maryland, below the state's typical monthly average. Outages that start in October have averaged 1.8 hours.
Main causes by season
Named storms behind Maryland's worst recorded outages, from the NOAA Storm Events Database.
Winter (December–February)
- Winter Storm
- Winter Weather
- Coastal Flood
- Tornado
- Dense Fog
Spring (March–May)
- Dense Fog
- Thunderstorm Wind
- High Wind
- Winter Weather
- Frost/Freeze
Summer (June–August)
- Hail
- Tropical Storm Isaias
- Excessive Heat
- Tornado
- Thunderstorm Wind
Fall (September–November)
- Thunderstorm Wind
Maryland's worst outage events on record
The five largest outages in Maryland by duration and customers affected.
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Mar 2, 2018 | 91 hrs | 108,677 (27%) | Dense Fog |
| Mar 2, 2018 | 90 hrs | 85,071 (24%) | Dense Fog |
| Jul 12, 2022 | 106 hrs | 64,522 (18%) | Thunderstorm Wind |
| Jul 28, 2023 | 85 hrs | 55,999 (14%) | Thunderstorm Wind |
| Jul 12, 2022 | 116 hrs | 31,551 (27%) | Thunderstorm Wind |
Highest-risk counties in Maryland
Lowest reliability percentile among Maryland's tracked counties.
| County | Grade | National percentile |
|---|---|---|
| Garrett County | D | 27th |
| Allegany County | C | 43rd |
| Carroll County | C | 49th |
| Cecil County | C | 51st |
| Harford County | C | 56th |
Live weather alerts for Maryland
These live alerts come from the National Weather Service. They are public-safety information, not an outage prediction.
Maryland power outage FAQ
When do power outages happen most in Maryland?
July is historically the busiest single month for recorded outages in Maryland, and Summer (June–August) accounts for about 36% of all recorded outages across the state.
How long do power outages in Maryland typically last?
Across Maryland's tracked counties, the average recorded outage lasts about 2.2 hours, though individual events -- especially named storms -- can run much longer.
Which counties in Maryland have the highest outage risk?
Garrett County, Allegany County, Carroll County, Cecil County, Harford County currently rank lowest for reliability in Maryland. See each county's page for its full history.
Does this page predict a power outage in Maryland?
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 Maryland's outage season
Sized for Maryland's recorded outage frequency and duration.
