NHC HURDAT2 · SPC Tornado Database
Hurricanes and Tornadoes That Hit Groton, MA
Every tropical system within 75 miles since 1851 and every tornado within 25 miles since 1950.
Data: NOAA NHC HURDAT2 and NOAA SPC tornado and hail reports, through 2025 · Updated
47 tropical systems have passed within 75 miles of Groton, Massachusetts since 1851, 9 of them at hurricane strength; the most recent was Elsa in 2021. Since 1950, 55 tornadoes have touched down within 25 miles, 4 of them rated EF3 or stronger.
- Hurricanes
- 9
- Tropical storms
- 38
- Tornadoes
- 55
- EF3 or stronger
- 4
within 75 mi, since 1851
below hurricane strength
within 25 mi, since 1950
95 deaths in all
What the records show for Groton
The strongest storm to pass near Groton was an unnamed storm in 1869, a Category 2 hurricane with 104 mph winds when its centre passed 65 miles away. The closest pass by a hurricane was Carol in 1954, whose centre crossed the city. The record near Groton begins with an unnamed storm in 1851; the most recent system was Elsa in 2021, a tropical storm 50 miles away. The 1890s and the 1960s were the busiest decades, with 5 systems each. Of the 47 systems, 5 have come since 2000. Of the 346 Massachusetts cities on this site, 65% have more hurricanes within 75 miles than Groton. The strongest of the 55 tornadoes within 25 miles was an F4 on June 9, 1953; its path came within 20 miles, and it killed 94 people. Of the 55, 2 had paths within 5 miles of the city centre, and 11 have come since 2000. July has had the most tornadoes, 20. The most recent tornado was on September 6, 2025. Groton has more tornadoes within 25 miles than 66% of the 346 Massachusetts cities. Hail has been reported within 10 miles 50 times since 1957, with stones up to 2 inches (hen egg size). Of the 346 Massachusetts cities, 57% have more hail reports within 10 miles than Groton.
Compare Groton's storm record with another city →
Tropical storms and hurricanes near Groton
| Year | Storm | Closest | Strength when closest | Peak |
|---|---|---|---|---|
| 2021 | ElsaJul 9 | 50 mi | Tropical storm (52 mph) | Category 1 |
| 2013 | AndreaJun 8 | 53 mi | Tropical storm (46 mph) | Tropical storm |
| 2011 | IreneAug 28 | 69 mi | Tropical storm (56 mph) | Category 3 |
| 2008 | HannaSep 7 | 36 mi | Tropical storm (52 mph) | Category 1 |
| 2007 | BarryJun 4 | 41 mi | Tropical storm (40 mph) | Tropical storm |
| 1999 | FloydSep 17 | 4 mi | Tropical storm (55 mph) | Category 4 |
| 1996 | BerthaJul 14 | 14 mi | Tropical storm (68 mph) | Category 3 |
| 1991 | BobAug 19 | 47 mi | Category 1 (87 mph) | Category 3 |
| 1985 | GloriaSep 27 | 30 mi | Category 1 (79 mph) | Category 4 |
| 1976 | BelleAug 10 | 43 mi | Tropical storm (40 mph) | Category 3 |
| 1971 | DoriaAug 28 | 50 mi | Tropical storm (54 mph) | Tropical storm |
| 1968 | Unnamed 1968 stormSep 11 | 56 mi | Tropical storm (58 mph) | Tropical storm |
| 1966 | AlmaJun 14 | 68 mi | Tropical storm (46 mph) | Category 3 |
| 1961 | Unnamed 1961 stormSep 15 | 3 mi | Tropical storm (66 mph) | Tropical storm |
| 1960 | DonnaSep 12 | 9 mi | Tropical storm (72 mph) | Category 4 |
| 1960 | BrendaJul 30 | 13 mi | Tropical storm (47 mph) | Tropical storm |
| 1959 | CindyJul 11 | 74 mi | Tropical storm (58 mph) | Category 1 |
| 1954 | CarolAug 31 | overhead | Category 2 (98 mph) | Category 3 |
| 1952 | AbleSep 2 | 74 mi | Tropical storm (52 mph) | Category 2 |
| 1944 | Unnamed 1944 stormSep 15 | 49 mi | Category 1 (74 mph) | Category 5 |
| 1938 | Unnamed 1938 stormSep 21 | 74 mi | Category 1 (87 mph) | Category 5 |
| 1934 | Unnamed 1934 stormSep 9 | 17 mi | Tropical storm (47 mph) | Category 2 |
| 1924 | Unnamed 1924 stormOct 1 | 74 mi | Tropical storm (63 mph) | Category 1 |
| 1923 | Unnamed 1923 stormOct 19 | 25 mi | Tropical storm (51 mph) | Tropical storm |
| 1916 | Unnamed 1916 stormJul 21 | 46 mi | Tropical storm (59 mph) | Category 2 |
| 1916 | Unnamed 1916 stormMay 17 | 12 mi | Tropical storm (58 mph) | Tropical storm |
| 1915 | Unnamed 1915 stormAug 5 | 44 mi | Tropical storm (40 mph) | Category 1 |
| 1908 | Unnamed 1908 stormMay 31 | 19 mi | Tropical storm (40 mph) | Category 1 |
| 1907 | Unnamed 1907 stormJun 30 | 68 mi | Tropical storm (40 mph) | Tropical storm |
| 1904 | Unnamed 1904 stormSep 15 | 73 mi | Category 1 (85 mph) | Category 1 |
| 1902 | Unnamed 1902 stormJun 17 | 33 mi | Tropical storm (40 mph) | Tropical storm |
| 1899 | Unnamed 1899 stormNov 1 | 64 mi | Tropical storm (52 mph) | Category 2 |
| 1897 | Unnamed 1897 stormSep 24 | 18 mi | Tropical storm (45 mph) | Tropical storm |
| 1896 | Unnamed 1896 stormSep 10 | 49 mi | Tropical storm (60 mph) | Category 3 |
| 1894 | Unnamed 1894 stormOct 10 | 1 mi | Tropical storm (61 mph) | Category 3 |
| 1893 | Unnamed 1893 stormAug 29 | 49 mi | Tropical storm (61 mph) | Category 3 |
| 1888 | Unnamed 1888 stormSep 12 | 39 mi | Tropical storm (40 mph) | Tropical storm |
| 1888 | Unnamed 1888 stormAug 22 | 39 mi | Tropical storm (48 mph) | Category 3 |
| 1878 | Unnamed 1878 stormOct 24 | 19 mi | Tropical storm (59 mph) | Category 2 |
| 1874 | Unnamed 1874 stormSep 30 | 6 mi | Tropical storm (69 mph) | Category 1 |
| 1872 | Unnamed 1872 stormOct 27 | 57 mi | Tropical storm (46 mph) | Category 1 |
| 1869 | Unnamed 1869 stormOct 4 | 65 mi | Category 2 (104 mph) | Category 2 |
| 1869 | Unnamed 1869 stormSep 8 | 18 mi | Category 2 (97 mph) | Category 3 |
| 1861 | Unnamed 1861 stormNov 3 | 23 mi | Tropical storm (58 mph) | Category 1 |
| 1861 | Unnamed 1861 stormSep 28 | overhead | Tropical storm (58 mph) | Category 1 |
| 1858 | Unnamed 1858 stormSep 16 | 7 mi | Category 1 (74 mph) | Category 2 |
| 1851 | Unnamed 1851 stormOct 19 | 42 mi | Tropical storm (46 mph) | Tropical storm |
Strength is the sustained wind on the track at the closest point, which is not the wind felt in Groton: a hurricane's worst winds sit within a few dozen miles of its centre, and inland cities are usually past that.
Tornadoes within 25 miles of Groton
By decade
- 2020s7
- 2010s3
- 2000s1
- 1990s1
- 1980s7(1 EF3+)
- 1970s8(2 EF3+)
- 1960s15
- 1950s13(1 EF3+)
| Date | Rating | Distance | Path | Killed / injured |
|---|---|---|---|---|
| Jun 9, 1953 | F4 | 20 mi | 34.9 mi | 94 / 1228 |
| Oct 3, 1970 | F3 | 3 mi | 35.4 mi | 1 / 0 |
| Jun 22, 1981 | F3 | 18 mi | 7.1 mi | 0 / 3 |
| Sep 29, 1974 | F3 | 17 mi | 0.1 mi | 0 / 1 |
| Jul 21, 1972 | F2 | 9 mi | 7.6 mi | 0 / 4 |
| Jul 17, 1968 | F2 | 20 mi | 0.1 mi | 0 / 0 |
| Aug 31, 1966 | F2 | 25 mi | 1 mi | 0 / 0 |
| Aug 28, 1965 | F2 | 13 mi | 2 mi | 0 / 0 |
| Jun 9, 1963 | F2 | 20 mi | 10 mi | 0 / 0 |
| May 20, 1963 | F2 | 15 mi | 0.3 mi | 0 / 0 |
| May 20, 1963 | F2 | 16 mi | 1.5 mi | 0 / 0 |
| Jul 2, 1961 | F2 | 21 mi | 5.1 mi | 0 / 1 |
The strongest 12 of 55, by rating and then by deaths. Ratings before February 2007 are on the original Fujita scale.
Hail in Groton
The Storm Prediction Center has 50 hail reports within 10 miles of Groton since 1957, made on 33 separate days. Of these, 26 were 1 inch across or larger, and one reached 2 inches. The largest, 2 inches (hen egg size), fell on August 4, 2015. The most recent report is from July 11, 2025. July has the most reports, 22.
Source: NOAA Storm Prediction Center severe weather reports, data through 2025.
Weather by month in Groton
The nearest NOAA station with 1991–2020 climate normals is Lowell, MA, 10 miles east of Groton at 110 feet. July is the warmest, with an average high of 85°F and low of 61°F; January is the coolest, at 34°F and 16°F. October is the wettest at 5.0 inches of precipitation on average and February the driest at 3.2 inches; the year adds up to 48.6 inches over 89 days with at least a tenth of an inch. June to November, the hurricane season months, bring 52% of the year's precipitation (25.1 of 48.6 inches); the other six months are drier. September has brought the most of the 47 tropical systems that passed within 75 miles (18); a normal September there has highs of 76°F and 3.9 inches of precipitation. Highs reach 90°F on about 20 days a year, almost all from May to September. Lows fall below freezing on about 148 nights a year. That 48.6 inches is more than at 32 of the 65 Massachusetts stations used on this site (49%). Pepperell, 4 miles northwest, has its own station (Nashua 2 NNW, NH): 48.2 inches a year, 0.4 less than here, and a July average high of 84°F against 85°F.
| Month | High °F | Low °F | Precip. in | Days ≥ 0.1" |
|---|---|---|---|---|
| Jan | 34 | 16 | 3.6 | 8 |
| Feb | 37 | 17 | 3.2 | 7 |
| Mar | 45 | 24 | 4.3 | 8 |
| Apr | 59 | 35 | 4.1 | 8 |
| May | 70 | 45 | 3.8 | 8 |
| Jun | 79 | 55 | 4.4 | 8 |
| Jul | 85 | 61 | 3.9 | 7 |
| Aug | 83 | 59 | 4.0 | 7 |
| Sep | 76 | 52 | 3.9 | 6 |
| Oct | 62 | 40 | 5.0 | 8 |
| Nov | 51 | 30 | 3.9 | 7 |
| Dec | 40 | 22 | 4.5 | 8 |
| Year | 60 | 38 | 48.6 | 89 |
Averages for 1991–2020 at Lowell, MA (110 ft), from NOAA NCEI U.S. Climate Normals. Normals describe the station; the farther a place is from it, and the bigger the difference in height, the more its weather can differ.
Floods, thunderstorm wind and lightning near Groton
Since 1996, the National Weather Service has logged 174 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Groton: 150 thunderstorm wind reports, 10 floods, 8 flash floods and 6 lightning strikes. They killed 0 people and injured 6, and the NWS estimated $4.1 million in property and crop damage. The strongest thunderstorm gust on record here was 110 mph, on September 6, 2014. July has had the most flash floods, 4 of 8. Of the 339 Massachusetts cities on this site with a flash flood on record, 81 have had fewer than Groton.
October 7, 2020: thunderstorm wind 4 miles from the centre of Groton — 5 injured, $2,000 damage.
May 31, 1998: thunderstorm wind 4 miles from the centre of Groton — 1 injured, $10,000 damage.
March 14, 2010: flood 8 miles from the centre of Groton — $2.7 million damage.
Source: NOAA NCEI Storm Events Database, events whose starting point is on record, 1996 to June 30, 2026. Damage is the NWS estimate in the dollars of the year, not insured losses, and NWS notes that some reports are unverified.
Flood insurance claims, disaster declarations and FEMA risk ratings
Middlesex County, which includes Groton, has been named in 35 federal disaster or emergency declarations since 1985, 19 of them major disasters (by incident: 9 severe storms, 8 snowstorms, 7 hurricanes, 5 floods). The latest major disaster declaration was Covid-19 Pandemic, on March 27, 2020. FEMA's National Risk Index gives Middlesex County a Relatively High rating for natural hazard risk overall; by hazard: Relatively High for hurricanes, inland flooding, strong wind and lightning; Relatively Moderate for tornadoes and heat waves; Relatively Low for coastal flooding; Very Low for hail. It models the county's expected loss from all 18 hazards it covers at $321.9 million a year, the highest of 14 Massachusetts counties; of the hazards above, the largest share, $224.4 million (70%), is from inland flooding.
Claims: FEMA, OpenFEMA Dataset FIMA NFIP Redacted Claims – v3, summed over ZIP codes; payments in the dollars of each year, not adjusted for inflation. Declarations: Disaster Declarations Summaries – v2, by county. Retrieved October 25, 2026. This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Risk ratings: FEMA, National Risk Index county table, December 2025 (v1.20), retrieved October 26, 2026; ratings compare counties nationwide, are meant for planning and are no substitute for a local risk assessment. This product uses the Federal Emergency Management Agency's National Risk Index dataset API or downloadable datasets but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
What counts as a pass, the distances and the sources: how this storm history is built.