States › Pennsylvania › Delaware County
Delaware County, Pennsylvania
Recorded hazard history: storm events since 1950, federal disaster declarations since 1953, flood insurance claims since 1978, and FEMA's risk index.
NCEI notes that Storm Data is compiled from a variety of sources including the National Weather Service, other federal, state and local agencies, the media and the public; that property and crop damage figures are estimates; and that some events are recorded by NWS forecast zone rather than by county. FEMA notes that NFIP claim records are redacted and aggregated to protect the privacy of policyholders. NCEI storm records through 30 Jun 2026; OpenFEMA declarations refreshed 1 Oct 2026; NFIP claims as of 8 Sep 2026.
The NCEI record lists 1,342 events for Delaware County, Pennsylvania, between 1950 and 2026; damaging wind account for the largest share.
That is 730.1 events per 100 square miles, above the Pennsylvania figure of 121.6, and 23.4 per 10,000 residents against 42.0 statewide.
46 events fall in the 12 months to 30 Jun 2026. NCEI attributes 25 deaths and 109 injuries to events in the county, with property damage estimated at $91M.
FEMA has designated the county in 24 federal disaster declarations since 1953; the most recent is Remnants Of Hurricane Ida (major disaster, 10 Sep 2021).
National Flood Insurance Program policyholders in the county filed 3,034 claims since 1978, of which 2,405 were paid, totalling $57M (about $24K per paid claim). FEMA counts 1,153 residential flood policies in force.
FEMA's National Risk Index rates the county's overall risk as "Relatively Moderate" and its expected annual loss as "Relatively Moderate" ($135M a year across 18 hazards).
44 tropical storm or hurricane tracks in the HURDAT2 record passed within 100 miles of the county's centre at tropical-storm strength or more, 0 of them within 50 miles at hurricane strength.
Compared with Pennsylvania and the United States
| Measure | Delaware County | Pennsylvania | US |
|---|---|---|---|
| Recorded events since 1950 | 1,342 | 54,427 | 1,977,440 |
| Events per 100 square miles | 730.1 | 121.6 | 56.0 |
| Events per 10,000 residents | 23.4 | 42.0 | 59.6 |
| Events in the last 12 months | 46 | 2,028 | 62,008 |
| Deaths recorded by NCEI | 25 | 901 | 26,435 |
| Property damage (NCEI estimates) | $91M | $5.3B | $575B |
| NFIP claims per 1,000 residents | 5.3 | 5.9 | 8.1 |
| Average paid NFIP claim | $24K | $23K | $43K |
| Claims per 100 policies in force, last 10 years | 39.3 | 25.9 | 16.1 |
County-recorded events plus zone-recorded events whose forecast zone is named for the county. State and US rows include events recorded only by forecast zone. Rates use 2021 Census population and land area.
Events by decade
Trend: 854 events in the 20 years to 2025 against 437 in the 20 years before. Reporting practice changed in 1996 and again with automated reports in the 2000s, so decade totals measure the record as much as the weather.
Events by type
Hazard pages exist for hail, tornado, flood, wind and winter where the county has at least 10 recorded events. "Other" covers heavy rain, debris flow, dust, funnel clouds and similar reports.
Largest recorded events
| Date | Event type | Group | Magnitude | Property damage | Crop damage | Deaths | Injuries | Geography |
|---|---|---|---|---|---|---|---|---|
| 4 Jul 1999 | Heat | Heat | — | — | — | 7 | — | Forecast zone |
| 22 Jan 2014 | Cold/Wind Chill | Cold | — | — | — | 3 | — | Forecast zone |
| 18 Jan 2015 | Winter Weather | Winter | — | — | — | 2 | 20 | Forecast zone |
| 16 Jul 2010 | Excessive Heat | Heat | — | — | — | 2 | — | Forecast zone |
| 7 Jun 2008 | Excessive Heat | Heat | — | — | — | 1 | 22 | Forecast zone |
| 16 Sep 1999 | Flash Flood | Flood | — | $15M | — | 1 | 14 | County |
| 14 Oct 2003 | Thunderstorm Wind | Wind | 64 mph | — | — | 1 | 1 | County |
| 7 Jan 1996 | Blizzard | Winter | — | $1.4M | — | 1 | — | Forecast zone |
| 2 Feb 2015 | Strong Wind | Wind | 49 mph | $20K | — | 1 | — | Forecast zone |
| 13 Jul 1997 | Heat | Heat | — | — | — | 1 | — | Forecast zone |
| 23 Jul 1999 | Heat | Heat | — | — | — | 1 | — | Forecast zone |
| 2 Jun 2006 | Lightning | Lightning | — | — | — | 1 | — | County |
| 19 Dec 2009 | Heavy Snow | Winter | — | — | — | 1 | — | Forecast zone |
| 21 Jan 2014 | Heavy Snow | Winter | — | — | — | 1 | — | Forecast zone |
| 3 Jun 2020 | Thunderstorm Wind | Wind | 60 mph | — | — | 1 | — | County |
| 13 Jan 1999 | Winter Storm | Winter | — | — | — | — | 12 | Forecast zone |
| 15 May 2004 | Thunderstorm Wind | Wind | 46 mph | — | — | — | 8 | County |
| 15 Jul 2013 | Excessive Heat | Heat | — | — | — | — | 4 | Forecast zone |
| 21 Mar 2000 | Flash Flood | Flood | — | — | — | — | 3 | County |
| 24 Jun 2010 | Thunderstorm Wind | Wind | 76 mph | $1.0M | — | — | 2 | County |
Ranked by deaths, then injuries, then NCEI's damage estimate. Deaths and injuries are NCEI counts (direct plus indirect); no personal details are recorded here.
Federal disaster declarations
| Declared | Number | Type | Incident | Title | Programs |
|---|---|---|---|---|---|
| 10 Sep 2021 | DR-4618 | Major disaster | Hurricane | Remnants Of Hurricane Ida | Individual assistance, Public assistance |
| 30 Mar 2020 | DR-4506 | Major disaster | Biological | Covid-19 Pandemic | Individual assistance, Public assistance |
| 13 Mar 2020 | EM-3441 | Emergency | Biological | Covid-19 | Public assistance |
| 6 Feb 2014 | EM-3367 | Emergency | Severe Ice Storm | Severe Winter Storm | Public assistance |
| 29 Oct 2012 | EM-3356 | Emergency | Hurricane | Hurricane Sandy | Public assistance |
| 12 Sep 2011 | DR-4030 | Major disaster | Flood | Tropical Storm Lee | Individual assistance |
| 8 Sep 2011 | EM-3340 | Emergency | Flood | Remnants Of Tropical Storm Lee | Public assistance |
| 3 Sep 2011 | DR-4025 | Major disaster | Hurricane | Hurricane Irene | Individual assistance, Public assistance |
| 29 Aug 2011 | EM-3339 | Emergency | Hurricane | Hurricane Irene | Public assistance |
| 16 Apr 2010 | DR-1898 | Major disaster | Snowstorm | Severe Winter Storms And Snowstorms | Public assistance |
| 10 Sep 2005 | EM-3235 | Emergency | Hurricane | Hurricane Katrina | Public assistance |
| 19 Sep 2004 | DR-1557 | Major disaster | Hurricane | Tropical Depression Ivan | Individual assistance |
| 19 Sep 2004 | DR-1555 | Major disaster | Severe Storm | Severe Storms And Flooding Associated With Tropical Depression Frances | — |
| 6 Aug 2004 | DR-1538 | Major disaster | Severe Storm | Severe Storms And Flooding | Individual assistance |
| 14 Mar 2003 | EM-3180 | Emergency | Severe Storm | Snow | Public assistance |
| 18 Sep 1999 | DR-1294 | Major disaster | Hurricane | Hurricane Floyd Major Disaster Declarations | Individual assistance, Public assistance |
| 21 Jan 1996 | DR-1093 | Major disaster | Flood | Severe Storms And Flooding | Individual assistance |
| 13 Jan 1996 | DR-1085 | Major disaster | Snowstorm | Blizzard Of 96 | Public assistance |
| 10 Mar 1994 | DR-1015 | Major disaster | Severe Storm | Severe Winter Storms | Public assistance |
| 16 Mar 1993 | EM-3105 | Emergency | Snowstorm | Severe Snowfall & Winter Storm | Public assistance |
| 17 Jul 1973 | DR-400 | Major disaster | Flood | Severe Storms & Flooding | Individual assistance, Public assistance |
| 23 Jun 1972 | DR-340 | Major disaster | Flood | Tropical Storm Agnes | Individual assistance, Public assistance |
| 18 Sep 1971 | DR-312 | Major disaster | Flood | Floods | Individual assistance, Public assistance |
| 18 Aug 1965 | DR-206 | Major disaster | Drought | Water Shortage | Individual assistance, Public assistance |
Declarations in which FEMA designated this county, from the OpenFEMA Disaster Declarations Summaries (v2). DR: major disaster; EM: emergency; FM: fire management assistance. Programs show whether individual or public assistance was made available.
Flood insurance claims
| Year of loss | Claims | Paid claims | Amount paid | Average paid |
|---|---|---|---|---|
| 2026 | 2 | 2 | $9,274 | $4,637 |
| 2025 | 7 | 2 | $12,077 | $6,038 |
| 2024 | 14 | 11 | $221,502 | $20,137 |
| 2023 | 8 | 1 | $10,248 | $10,248 |
| 2021 | 35 | 29 | $2,908,573 | $100,296 |
| 2020 | 268 | 237 | $11,647,278 | $49,145 |
| 2019 | 37 | 30 | $924,044 | $30,801 |
| 2018 | 77 | 57 | $1,398,320 | $24,532 |
| 2017 | 5 | 4 | $35,496 | $8,874 |
| 2016 | 9 | 4 | $40,965 | $10,241 |
| 2015 | 9 | 4 | $11,083 | $2,771 |
| 2014 | 53 | 41 | $1,384,683 | $33,773 |
| 2013 | 24 | 18 | $146,175 | $8,121 |
| 2012 | 35 | 25 | $476,031 | $19,041 |
| 2011 | 314 | 255 | $6,211,063 | $24,357 |
| 2010 | 326 | 271 | $8,803,799 | $32,486 |
| 2009 | 29 | 19 | $189,955 | $9,998 |
| 2008 | 7 | 4 | $20,538 | $5,135 |
| 2007 | 27 | 17 | $86,479 | $5,087 |
| 2006 | 11 | 6 | $77,944 | $12,991 |
| 2005 | 18 | 11 | $75,667 | $6,879 |
| 2004 | 334 | 293 | $5,601,385 | $19,117 |
| 2003 | 82 | 62 | $1,076,588 | $17,364 |
| 2002 | 5 | 2 | $2,338 | $1,169 |
| 2001 | 24 | 17 | $186,457 | $10,968 |
OpenFEMA NFIP claims (v3, as of 8 Sep 2026), aggregated by year of loss; amounts are building, contents and increased-cost-of-compliance payments as recorded. Repetitive-loss counts from the NFIP Multiple Loss Properties file (2 Aug 2026); policies in force from the NFIP Residential Penetration Rates file (3 Aug 2026).
National Risk Index
| Hazard (NRI) | Risk rating | Expected annual loss |
|---|---|---|
| Inland flooding | $73,868,895 | |
| Earthquake | $13,263,729 | |
| Heat wave | $12,832,470 | |
| Tornado | $9,404,375 | |
| Cold wave | $8,512,539 | |
| Hurricane | $5,855,053 | |
| Strong wind | $5,185,341 | |
| Winter weather | $2,139,923 | |
| Lightning | $2,133,253 | |
| Ice storm | $749,969 | |
| Coastal flooding | $730,166 | |
| Drought | $208,692 | |
| Hail | $45,783 | |
| Wildfire | $13,011 | |
| Landslide | $2,758 | |
| Avalanche | $11 |
FEMA National Risk Index, December 2025 release. Ratings are FEMA's relative comparison of counties; expected annual loss is FEMA's modelled estimate of average yearly building, population and agriculture loss. See how to read the NRI.
Hurricane and tropical storm passes
| Storm | Year | Closest approach | Max wind while within 100 mi |
|---|---|---|---|
| Ida | 2021 | 13 mi | 40 mph |
| Fay | 2020 | 61 mi | 58 mph |
| Isaias | 2020 | 70 mi | 63 mph |
| Andrea | 2013 | 95 mi | 46 mph |
| Sandy | 2012 | 42 mi | 81 mph |
| Irene | 2011 | 64 mi | 69 mph |
| Hanna | 2008 | 48 mi | 52 mph |
| Ernesto | 2006 | 69 mi | 46 mph |
| Charley | 2004 | 95 mi | 40 mph |
| Jeanne | 2004 | 86 mi | 40 mph |
| Bertha | 1996 | 51 mi | 69 mph |
| Danielle | 1992 | 34 mi | 40 mph |
| Doria | 1971 | 98 mi | 58 mph |
| Brenda | 1960 | 84 mi | 58 mph |
| Connie | 1955 | 85 mi | 58 mph |
| Diane | 1955 | 25 mi | 46 mph |
| Hazel | 1954 | 97 mi | 81 mph |
| Able | 1952 | 65 mi | 58 mph |
| Unnamed Atlantic storm | 1949 | 88 mi | 58 mph |
| Unnamed Atlantic storm | 1944 | 69 mi | 40 mph |
| Unnamed Atlantic storm | 1943 | 80 mi | 40 mph |
| Unnamed Atlantic storm | 1934 | 8 mi | 46 mph |
| Unnamed Atlantic storm | 1933 | 97 mi | 52 mph |
| Unnamed Atlantic storm | 1929 | 48 mi | 58 mph |
| Unnamed Atlantic storm | 1916 | 79 mi | 52 mph |
HURDAT2 best-track positions at tropical-storm strength (34 kt) or more, measured from the county's Census centre point; through the 2025 season. Distance from a track is not the same as the extent of the storm's wind, rain or surge.
ZIP codes with flood claims
- 19023 566
- 19015 500
- 19082 361
- 19087 232
- 19013 193
- 19083 156
- 19064 148
- 19317 106
- 19029 90
- 19008 66
- 19063 65
- 19061 63
- 19070 61
- 19026 56
- 19018 41
- 19050 40
- 19014 38
- 19073 36
- 19081 31
- 19086 29
- 19342 29
- 19033 26
- 19022 24
- 19094 24
- 19036 22
- 19078 20
- 19079 17
- 19085 17
- 19003 15
- 19060 13
- 19076 12
- 19043 11
- 19373 9
- 19331 8
- 19052 5
- 19319 5
ZIP codes whose NFIP claims carry this county's code, with the number of claims. Five or more claims are needed for a ZIP page to be indexed.
Questions and answers
How often does it hail in Delaware County, PA?
NCEI records 63 hail events in Delaware County since 1950, in 25 different years; that is about 0.8 recorded events a year. 3 reports were golf-ball size (1.75 in) or larger.
Has Delaware County had a tornado?
Yes. NCEI records 5 tornadoes in Delaware County since 1950, 2 of them rated (E)F2 or stronger. Tornado deaths recorded: 0.
When was the last federal disaster declaration for Delaware County?
10 Sep 2021: Remnants Of Hurricane Ida, a major disaster declaration for hurricane. The county appears in 24 declarations since 1953.
How many flood insurance claims have been filed in Delaware County, and how much was paid?
3,034 NFIP claims since 1978, 2,405 of them paid, for $57M in total. FEMA publishes these figures redacted and aggregated; individual properties are not identified.
Is Delaware County in the National Risk Index's high-risk band?
FEMA's National Risk Index (December 2025) rates the county "Relatively Moderate" for overall risk, "Relatively Moderate" for expected annual loss, "Relatively Low" for social vulnerability and "Very High" for community resilience. These ratings are FEMA's relative comparison across all US counties.
How does Delaware County compare with the rest of Pennsylvania?
730.1 recorded events per 100 square miles against 121.6 statewide, and 5.3 NFIP claims per 1,000 residents against 5.9. The comparison table on this page shows each measure beside the state and national figures.
Provenance
Storm events: NOAA NCEI Storm Events Database, yearly details files through 30 Jun 2026 (public domain). Declarations: OpenFEMA DisasterDeclarationsSummaries v2, refreshed 1 Oct 2026. Flood claims: OpenFEMA NfipClaims v3 as of 8 Sep 2026; NfipMultipleLossProperties v1 (2 Aug 2026); NfipResidentialPenetrationRates v1 (3 Aug 2026). Risk index: FEMA National Risk Index, December 2025. Hurricane tracks: NHC HURDAT2 through 2025. Population and area: US Census Bureau, 2021 vintage. Built 1 Oct 2026; see the methodology and corrections pages. Hazard hubs: Hail · Tornado · Flood · Wind · Winter.