Delaware lightning map
Delaware gets a steady run of summer thunderstorms as humid Mid-Atlantic air interacts with sea breezes off the Delaware Bay and Atlantic.
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Detected from NOAA GOES-19 GLM satellite data. Aggregate count for Delaware — your exact location and alerts live in the app.
About lightning in Delaware
Delaware sees humid Mid-Atlantic thunderstorms through the summer, energized by moisture off the Delaware and Chesapeake bays and the afternoon heating that follows. Storms tend to fire June through August, often along cold fronts pushing toward the coast. Flat terrain lets them approach quickly. Knowing how far away the nearest strike is — and whether it is approaching — gives you the lead time the sky does not.
- Thunderstorm days/yr
- 30
- US rank
- #34 of 50
- Peak season
- June–August
State thunderstorm-day normals are provisional (NOAA/NWS); per-city climate data is shown where a station normal is published.
Cities in Delaware
Lightning safety in Delaware
When storms build across Delaware, the distance to the nearest strike matters more than a statewide count. Follow the 30-30 rule: if thunder follows lightning by 30 seconds or less, get indoors, and wait 30 minutes after the last thunder before heading back out. If you can hear thunder, you are already close enough to be struck. StrikeCast surfaces the live distance and trend so you can act before the storm reaches you.
StrikeCast app
Distance, trend & alerts — in your pocket.
GPS-precise distance to the nearest strike, live approaching/moving-away trend, and push alerts for every place that matters across Delaware — home, work, the kids' school.
Your exact location stays on your device. Never shared. Never tracked.
Lightning guides
Frequently asked
How many thunderstorm days does Delaware get?
Delaware averages about 30 thunderstorm days a year, versus a US average near 25 — roughly 1.2× the national norm. Activity peaks June–August.
Where does Delaware rank for lightning in the US?
By mean annual thunderstorm days, Delaware ranks #34 of 50 states. Rankings use NOAA/NWS climate normals; the live distance and trend on this page come from NOAA GOES-19 satellite data.
When is thunderstorm season in Delaware?
Lightning is most frequent June–August in Delaware.
How does StrikeCast track lightning in Delaware?
StrikeCast reads NOAA GOES-19 GLM (Geostationary Lightning Mapper) satellite data, updated continuously, to show how far away the nearest strike is and whether it is approaching or moving away. Save any place in Delaware in the free app to get a push alert when lightning closes in.