Missouri Power Outage Season
When outages happen most in Missouri, and what to expect.
July is historically Missouri's busiest month for recorded power outages, part of a summer season (June–August) that accounts for about 34% of all recorded outages statewide, averaging 2.6 hours per event. 2 of Missouri's 115 tracked counties currently carry a Reliability Grade of F.
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Missouri outages by month
Total recorded events and average duration per event, summed across every tracked county in Missouri.
Peak season insight
Missouri's outage season runs June–August, accounting for 34% of all recorded outages. July has the highest frequency.
Month-by-month data table
| Month | Events | Avg duration |
|---|---|---|
| January | 3,796 | 3.4 hrs |
| February | 2,694 | 2.0 hrs |
| March | 4,552 | 2.9 hrs |
| April | 4,710 | 2.5 hrs |
| May | 6,107 | 3.0 hrs |
| June | 6,732 | 2.6 hrs |
| July | 7,054 | 3.0 hrs |
| August | 6,305 | 2.5 hrs |
| September | 4,708 | 2.0 hrs |
| October | 4,812 | 2.1 hrs |
| November | 4,282 | 2.1 hrs |
| December | 3,730 | 2.2 hrs |
This month in Missouri
October has historically recorded 4,812 outage events across Missouri, below the state's typical monthly average. Outages that start in October have averaged 2.1 hours.
Main causes by season
Named storms behind Missouri's worst recorded outages, from the NOAA Storm Events Database.
Winter (December–February)
- Winter Weather
- Winter Storm
- Drought
- High Wind
- Heavy Snow
Spring (March–May)
- Hail
- Thunderstorm Wind
- Strong Wind
- Tornado
- Frost/Freeze
Summer (June–August)
- Thunderstorm Wind
- Drought
- Heavy Rain
- Excessive Heat
- Hail
Fall (September–November)
- Thunderstorm Wind
- Hail
- Tornado
- Drought
- High Wind
Missouri's worst outage events on record
The five largest outages in Missouri by duration and customers affected.
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jun 30, 2023 | 147 hrs | 83,685 (59%) | Thunderstorm Wind |
| Jan 12, 2019 | 119 hrs | 66,817 (18%) | Winter Storm |
| May 16, 2025 | 168 hrs | 47,245 (8%) | Hail |
| Apr 29, 2025 | 129 hrs | 51,043 (24%) | Thunderstorm Wind |
| May 26, 2024 | 70 hrs | 89,477 (24%) | Thunderstorm Wind |
Highest-risk counties in Missouri
Lowest reliability percentile among Missouri's tracked counties.
| County | Grade | National percentile |
|---|---|---|
| St. Louis County | F | 10th |
| Reynolds County | F | 20th |
| Iron County | D | 22nd |
| Lawrence County | D | 33rd |
| Bollinger County | D | 36th |
Live weather alerts for Missouri
Flood Warning
Flood Warning issued October 1 at 9:03AM CDT until October 3 at 1:45AM CDT by NWS Kansas City/Pleasant Hill MO
Read the official NWS alert →Flood Warning
Flood Warning issued October 1 at 9:03AM CDT until October 4 at 4:00AM CDT by NWS Kansas City/Pleasant Hill MO
Read the official NWS alert →Flood Warning
Flood Warning issued October 1 at 9:03AM CDT until October 5 at 8:30AM CDT by NWS Kansas City/Pleasant Hill MO
Read the official NWS alert →Flood Warning
Flood Warning issued October 1 at 9:03AM CDT until October 5 at 6:03PM CDT by NWS Kansas City/Pleasant Hill MO
Read the official NWS alert →Flash Flood Warning
Flash Flood Warning issued October 1 at 9:02AM CDT until October 1 at 3:00PM CDT by NWS Kansas City/Pleasant Hill MO
Read the official NWS alert →These live alerts come from the National Weather Service. They are public-safety information, not an outage prediction.
Missouri power outage FAQ
When do power outages happen most in Missouri?
July is historically the busiest single month for recorded outages in Missouri, and Summer (June–August) accounts for about 34% of all recorded outages across the state.
How long do power outages in Missouri typically last?
Across Missouri's tracked counties, the average recorded outage lasts about 2.6 hours, though individual events -- especially named storms -- can run much longer.
Which counties in Missouri have the highest outage risk?
St. Louis County, Reynolds County, Iron County, Lawrence County, Bollinger County currently rank lowest for reliability in Missouri. See each county's page for its full history.
Does this page predict a power outage in Missouri?
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 Missouri's outage season
Sized for Missouri's recorded outage frequency and duration.
