New Hampshire Power Outage Season
When outages happen most in New Hampshire, and what to expect.
July is historically New Hampshire's busiest month for recorded power outages, part of a summer season (June–August) that accounts for about 29% of all recorded outages statewide, averaging 3.1 hours per event. 4 of New Hampshire's 10 tracked counties currently carry a Reliability Grade of F.
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New Hampshire outages by month
Total recorded events and average duration per event, summed across every tracked county in New Hampshire.
Peak season insight
New Hampshire's outage season runs June–August, accounting for 29% of all recorded outages. July has the highest frequency.
Month-by-month data table
| Month | Events | Avg duration |
|---|---|---|
| January | 703 | 3.4 hrs |
| February | 682 | 2.5 hrs |
| March | 961 | 5.0 hrs |
| April | 795 | 3.7 hrs |
| May | 670 | 2.2 hrs |
| June | 927 | 2.0 hrs |
| July | 1,111 | 2.3 hrs |
| August | 943 | 2.5 hrs |
| September | 741 | 2.0 hrs |
| October | 858 | 3.8 hrs |
| November | 1,046 | 3.2 hrs |
| December | 900 | 4.2 hrs |
This month in New Hampshire
October has historically recorded 858 outage events across New Hampshire, below the state's typical monthly average. Outages that start in October have averaged 3.8 hours.
Main causes by season
Named storms behind New Hampshire's worst recorded outages, from the NOAA Storm Events Database.
Winter (December–February)
- Winter Storm
Spring (March–May)
- Winter Storm
- Heavy Snow
Summer (June–August)
- Tropical Storm Isaias
- Thunderstorm Wind
- Drought
- Hail
Fall (September–November)
- Tropical Storm Philippe
- Winter Storm
- Heavy Snow
New Hampshire's worst outage events on record
The five largest outages in New Hampshire by duration and customers affected.
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Oct 30, 2017 | 116 hrs | 80,811 (47%) | Tropical Storm Philippe |
| Apr 4, 2024 | 98 hrs | 64,404 (38%) | Winter Storm |
| Nov 26, 2014 | 97 hrs | 61,747 (47%) | Winter Storm |
| Oct 30, 2017 | 95 hrs | 58,016 (29%) | Tropical Storm Philippe |
| Oct 30, 2017 | 115 hrs | 37,350 (28%) | Tropical Storm Philippe |
Highest-risk counties in New Hampshire
Lowest reliability percentile among New Hampshire's tracked counties.
| County | Grade | National percentile |
|---|---|---|
| Belknap County | F | 9th |
| Carroll County | F | 11th |
| Sullivan County | F | 16th |
| Cheshire County | F | 18th |
| Grafton County | D | 26th |
Live weather alerts for New Hampshire
There are no active National Weather Service alerts for New Hampshire right now.
These live alerts come from the National Weather Service. They are public-safety information, not an outage prediction.
New Hampshire power outage FAQ
When do power outages happen most in New Hampshire?
July is historically the busiest single month for recorded outages in New Hampshire, and Summer (June–August) accounts for about 29% of all recorded outages across the state.
How long do power outages in New Hampshire typically last?
Across New Hampshire's tracked counties, the average recorded outage lasts about 3.1 hours, though individual events -- especially named storms -- can run much longer.
Which counties in New Hampshire have the highest outage risk?
Belknap County, Carroll County, Sullivan County, Cheshire County, Grafton County currently rank lowest for reliability in New Hampshire. See each county's page for its full history.
Does this page predict a power outage in New Hampshire?
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 New Hampshire's outage season
Sized for New Hampshire's recorded outage frequency and duration.
