Hail history for Mercer County, New Jersey
Every NOAA hail report filed in Mercer County since 1974, with preliminary National Weather Service reports to November 3, 2026.
Readout · Mercer County
- Last hail
- Jul 27, 2026
- 1.00 in, quarter size
- Hail days, last 5 years
- 4
- since Nov 3, 2021 · 10 reports
- Largest ever
- 1.75 in
- golf ball · Jul 23, 2008
64 reports on 41 days since 1974 · #7 of 21 New Jersey counties
Hail map · Mercer County
- Under 1 in
- 1–1.75 in
- 1.75–2.5 in
- 2.5–4 in
- 4 in +
- No size
For homeowners
Roof damage after hail? Get a free inspection
Hail bruises shingles and cracks seals in ways you can't see from the ground, and most insurers set a claim deadline after the storm. The latest hail report in Mercer County is from July 27, 2026. A local roofer can check and document it at no cost.
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What the record says about Mercer County
The latest hail report in Mercer County is from July 27, 2026, 1.00 in (quarter size). Since November 3, 2021 there have been 4 separate hail days; the biggest stones in that time were 1.00 in on July 27, 2026.
Over the 20 years 2006–2025, Mercer County logged 37 reports on 19 hail days, about 1.9 reports a year. That is 28% more than the median New Jersey county (1.4 a year) and ranks #7 of 21 New Jersey counties for all-time reports. Mercer County holds 5% of all 1,170 hail reports in New Jersey.
0% of reports with a size were 2 inches (hen egg) or larger, against 0% for the median New Jersey county. The largest hail on record here is 1.75 in (golf ball) on July 23, 2008 near Pennington.
Reports were up 64% in 2016–2025 (23) compared with 2006–2015 (14). The busiest year was 2023, with 9 reports on 3 days. Hail here peaks in July (39% of reports); 36% fall between April and June.
Reports a year 2006–2025 average
- Mercer County 1.9
- Median New Jersey county 1.4
Hail days 2006–2025
- Mercer County 19
- Median New Jersey county 19
Share 2 in or larger of sized reports
- Mercer County 0%
- Median New Jersey county 0%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 1 | 1 | |||||||||||
| 2025 | 0 | ||||||||||||
| 2024 | 0 | ||||||||||||
| 2023 | 6 | 2 | 1 | 9 | |||||||||
| 2022 | 0 | ||||||||||||
| 2021 | 2 | 2 | |||||||||||
| 2020 | 6 | 6 | |||||||||||
| 2019 | 3 | 1 | 4 | ||||||||||
| 2018 | 0 | ||||||||||||
| 2017 | 0 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Jul 27, 2026 | 1 | 1.00 in | — |
| Sep 8, 2023 | 1 | 0.75 in | — |
| Apr 1, 2023 | 2 | 1.00 in | — |
| Feb 21, 2023 | 6 | 1.00 in | — |
Largest hail on record
| Date | Size | Location | Time · source |
|---|---|---|---|
| Jul 23, 2008 | 1.75 ingolf ball | Pennington | 14:32 local · NCEI |
| Oct 4, 2000 | 1.75 ingolf ball | Princeton | 18:45 local · NCEI |
| Jun 13, 1987 | 1.75 ingolf ball | — | 18:40 local · NCEI |
| Jun 24, 1985 | 1.75 ingolf ball | — | 14:45 local · NCEI |
| Jun 24, 1985 | 1.75 ingolf ball | — | 14:15 local · NCEI |
Sizes filed before 1996 are often rough estimates (round numbers like 7.00 or 8.00 in) without an exact spot; they are shown as NOAA filed them.
Size of every report
- Under 1 in 26 41%
- 1–2 in 37 59%
- 2 in + 0 0%
- No size 1
Most recent reports
| Date | Size | Location | Time · source |
|---|---|---|---|
| Jul 27, 2026 | 1.00 inquarter | 0.69 N Washington Crossing | 15:12 local · NCEI |
| Sep 8, 2023 | 0.75 inpenny | 0.87 SW Hopewell | 14:54 local · NCEI |
| Apr 1, 2023 | 1.00 inquarter | Ajax Park | 18:10 local · NCEI |
| Apr 1, 2023 | 1.00 inquarter | 0.87 NW Mercerville | 18:06 local · NCEI |
| Feb 21, 2023 | 1.00 inquarter | 0.69 S Woodsville | 15:47 local · NCEI |
| Feb 21, 2023 | 0.75 inpenny | Hamilton Square | 15:40 local · NCEI |
| Feb 21, 2023 | 0.75 inpenny | 0.69 S Woodsville | 15:37 local · NCEI |
| Feb 21, 2023 | 1.00 inquarter | Lawrenceville | 15:30 local · NCEI |
| Feb 21, 2023 | 1.00 inquarter | 0.53 W Pennington | 15:30 local · NCEI |
| Feb 21, 2023 | 0.75 inpenny | 0.53 E (Ttn)trenton Arpt | 15:25 local · NCEI |
| Jul 29, 2021 | 0.75 inpenny | 1.26 ENE Harbourton | 17:10 local · NCEI |
| Jul 6, 2021 | 1.00 inquarter | 0.69 S Woodsville | 20:31 local · NCEI |
Cities and towns in Mercer County
| Place | Reports | Largest |
|---|---|---|
| Hamilton Square | 13 | 1.75 in |
Smaller places with fewer than 10 reports
These places have too few reports for a page of their own, so their record lives here.
| Place | Reports | Hail days | Latest |
|---|---|---|---|
| The College of New Jersey | 7 | 6 | Apr 1, 2023 |
| Trenton | 6 | 5 | Feb 21, 2023 |
| Lawrenceville | 5 | 5 | Feb 21, 2023 |
| Pennington | 5 | 5 | Feb 21, 2023 |
| Princeton | 5 | 4 | Jul 28, 2012 |
| Princeton Junction | 3 | 2 | Jul 28, 2012 |
| Yardville | 3 | 3 | May 29, 2019 |
| Hopewell | 2 | 2 | Sep 8, 2023 |
| Mercerville | 2 | 2 | Apr 1, 2023 |
| White Horse | 2 | 2 | Jul 6, 2020 |
| Groveville | 1 | 1 | May 29, 2019 |
| Robbinsville Center | 1 | 1 | May 22, 1986 |
| Titusville | 1 | 1 | Jul 28, 2012 |
| Washington Crossing | 1 | 1 | Jul 27, 2026 |
Questions about hail in Mercer County
How often does it hail in Mercer County, New Jersey?
64 hail reports have been logged in Mercer County since 1974. Over the 20 years 2006–2025 that averages 1.9 reports a year. That ranks #7 of 21 New Jersey counties by number of reports.
When is hail season in Mercer County?
Most reports come in July, June, May. July alone accounts for 39% of all reports.
What is the largest hail recorded in Mercer County?
1.75 in (golf ball size) on July 23, 2008 near Pennington. 0% of reports here were 2 inches or larger.
When did it last hail in Mercer County?
The most recent report in this data is from July 27, 2026 (1.00 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Mercer County had in the last five years?
4 separate days with hail reports since November 3, 2021, adding up to 10 reports. The most recent was July 27, 2026.
Where does this hail data come from?
Hail reports come from the NOAA NCEI Storm Events Database, which the National Weather Service compiles from spotter, public, law enforcement and media reports. Recent days use preliminary NWS Local Storm Reports via the Iowa Environmental Mesonet until NOAA publishes final data. Only reported hail is counted, so areas with fewer people tend to have fewer reports.