Groton, MA Live Doppler Radar
Live radar for Groton, Middlesex County: every NWS radar combined, rain, snow and ice colors, flash-flood risk, storm tracks and official warnings.
What weather hits Groton?
Since 1996, the National Weather Service has logged damaging thunderstorm winds on 175 days in the Northwest Middlesex County forecast zone and Middlesex County — the most common reported hazard around Groton, mostly in July and June. Next come flooding (74 days) and heavy snow & winter storms (72 days).
| Hazard | Days reported | Most recent | Worst on record |
|---|---|---|---|
| Damaging thunderstorm winds | 175 | Jun 2026 | Jul 18, 2012 · $350,000 damage |
| Flooding | 74 | Jan 2024 | Mar 14, 2010 · $26 million damage |
| Heavy snow & winter storms | 72 | Feb 2026 | Jan 14, 2008 · $20,000 damage |
| Lightning casualties & damage | 55 | Jul 2025 | Jun 27, 2000 · 1 death |
| Flash flooding | 38 | Jun 2025 | Jul 10, 2010 · $11 million damage |
| High winds | 8 | Feb 2024 | Oct 28, 2006 · $15,000 damage |
| Ice storms & sleet | 1 | Dec 2008 | Dec 11, 2008 · $3.0 million damage |
| Extreme cold & wind chill | 1 | Feb 2015 | — |
Source: NOAA NCEI Storm Events Database, 1996–2026 (the latest year is partial). A "day" is a date with at least one report in the Northwest Middlesex County forecast zone and Middlesex County; damage is as reported, not adjusted for inflation.
How much snow does Groton get?
A normal year brings about 53 inches of snow to Groton, based on NOAA's 1991–2020 climate normals for the Nashua 2 Nnw weather station 13.3 miles away. The snowiest month is usually January (14.7 in).
| Oct | Nov | Dec | Jan | Feb | Mar | Apr | May |
|---|---|---|---|---|---|---|---|
| 0.0 | 1.7 | 11.2 | 14.7 | 14.5 | 10.1 | 0.7 | 0.0 |
Normal snowfall in inches. TALON Pro compares this season's snow at your location with these normals as winter goes on.
Which radars cover Groton?
The closest NEXRAD Doppler radar is KBOX (Boston, MA), about 50 miles south-southeast. Radar beams climb as they travel, so the height of the lowest scan over town decides how low in a storm the radar can see.
| Radar | Distance | Lowest beam over Groton | View |
|---|---|---|---|
| KBOX Boston, MA | 50 mi south-southeast | 3,600 ft | Good — most storms and steady rain or snow show clearly |
| KGYX Portland, ME | 110 mi northeast | 11,200 ft | Limited — the beam overshoots the lowest part of storms |
| KENX Albany, NY | 127 mi west | 13,900 ft | Limited — the beam overshoots the lowest part of storms |
Beam height is the center of the 0.5° scan above the radar, with standard refraction. Mountains near a radar can block it further.
Tornado & hail history near Groton
Since 1950, NOAA has recorded 57 tornadoes within 25 miles of Groton, 16 of them EF2/F2 or stronger. Most came in July and August. The strongest was an F4 on June 9, 1953, which passed about 20 miles south-southwest of town and caused 94 deaths. The most recent was an EF0 on September 6, 2025, which touched down about 24 miles southwest of town.
Hail: 180 reports of 1-inch or larger hail within 25 miles since 1955, 11 of them 2 inches or more; the largest was 2.25-inch hail on June 22, 1988.
Source: NOAA Storm Prediction Center — tornadoes 1950–2025, hail 1955–2025. Distances are to each tornado's track; ratings before February 2007 use the original Fujita scale.
On TALON you get Groton's live radar loop, rain/snow/ice colors, flash-flood risk, storm tracks with arrival times and NWS warnings free; close-up radar and rotation detection are part of TALON Pro.
Groton radar FAQ
Where is the nearest weather radar to Groton, MA?
KBOX (Boston, MA), about 50 miles south-southeast. KGYX (Portland, ME) is 110 miles away and also covers the area.
Does radar show snow in Groton?
Yes. TALON colors snow blue, a rain–snow mix pink and freezing rain purple using NOAA's precipitation-type analysis. Over Groton the lowest scan from KBOX is about 3,600 ft up.
Is TALON's radar for Groton free?
Yes — the US radar loop, rain/snow/ice colors, flash-flood risk, storm tracks and NWS warnings are free in any browser. Close-up radar, rotation detection and longer forecasts are part of TALON Pro.
Should I rely on radar for my safety?
No app replaces official warnings. When the National Weather Service issues a warning for Groton, follow it right away — see watch vs. warning.
Radar for nearby towns
- Leominster, MA radar 12 mi
- Lowell, MA radar 13 mi
- Fitchburg, MA radar 13 mi
- Marlborough, MA radar 18 mi
- Lawrence, MA radar 21 mi
- Methuen, MA radar 22 mi
- Gardner, MA radar 22 mi
- Framingham, MA radar 22 mi
- Waltham, MA radar 23 mi
- Woburn, MA radar 23 mi