Groton weather in March: Groton, Connecticut: normal highs, lows, rain and records for March
Groton in March has a normal high of 47°F and a normal low of 31°F, a daily mean of 39°F, rising from 43°F on the 1st to 51°F by the 31st. Measurable precipitation falls on 9 days in a normal March, 3.82 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 8°C and low of −1°C, 97 mm of precipitation in March.
- NOAA stationGroton New London Airport
- Station IDUSW00014707
- Location41.33°N 72.05°W
- Elevation10 ft (3 m)
- Population10,160
- Jan 38° 23°
- Feb 40° 25°
- Mar 47° 31°
- Apr 56° 39°
- May 65° 49°
- Jun 74° 58°
- Jul 80° 65°
- Aug 79° 64°
- Sep 74° 57°
- Oct 63° 46°
- Nov 53° 37°
- Dec 44° 29°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Groton in March?
The normal high is 47°F and the normal low 31°F, for a daily mean of 38.6°F. March is 6.2°F warmer than February and 9.0°F cooler than April. March is the 9th warmest month of the year in Groton and the 2nd wettest. Across the month the normal high rises 8°F, from 43°F on March 1 to 51°F on March 31. From one year to the next March's mean temperature typically moves about 3.1°F either way (NOAA's standard deviation), so roughly two Marchs in three average between 36°F and 42°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 33%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| March 1 | 43°F | 27°F | 29% | 17% |
| March 8 | 45°F | 29°F | 29% | 17% |
| March 15 | 46°F | 30°F | 30% | 18% |
| March 22 | 48°F | 32°F | 31% | 19% |
| March 31 | 51°F | 34°F | 33% | 20% |
Every day of March: normal high, low and chance of precipitation (warmest afternoon March 31, coldest night March 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| March 1 | 43°F | 27°F | 29% | 17% | 11 h 10 min |
| March 2 | 43°F | 28°F | 29% | 17% | 11 h 20 min |
| March 3 | 43°F | 28°F | 29% | 17% | 11 h 20 min |
| March 4 | 44°F | 28°F | 29% | 17% | 11 h 20 min |
| March 5 | 44°F | 28°F | 29% | 17% | 11 h 20 min |
| March 6 | 44°F | 28°F | 29% | 17% | 11 h 30 min |
| March 7 | 44°F | 29°F | 29% | 17% | 11 h 30 min |
| March 8 | 45°F | 29°F | 29% | 17% | 11 h 30 min |
| March 9 | 45°F | 29°F | 29% | 17% | 11 h 40 min |
| March 10 | 45°F | 29°F | 29% | 17% | 11 h 40 min |
| March 11 | 45°F | 30°F | 29% | 18% | 11 h 40 min |
| March 12 | 45°F | 30°F | 30% | 18% | 11 h 40 min |
| March 13 | 46°F | 30°F | 30% | 18% | 11 h 50 min |
| March 14 | 46°F | 30°F | 30% | 18% | 11 h 50 min |
| March 15 | 46°F | 30°F | 30% | 18% | 11 h 50 min |
| March 16 | 46°F | 31°F | 30% | 18% | 11 h 50 min |
| March 17 | 47°F | 31°F | 30% | 18% | 12 h |
| March 18 | 47°F | 31°F | 30% | 18% | 12 h |
| March 19 | 47°F | 31°F | 30% | 18% | 12 h |
| March 20 | 48°F | 32°F | 30% | 18% | 12 h 10 min |
| March 21 | 48°F | 32°F | 30% | 19% | 12 h 10 min |
| March 22 | 48°F | 32°F | 31% | 19% | 12 h 10 min |
| March 23 | 48°F | 32°F | 31% | 19% | 12 h 10 min |
| March 24 | 49°F | 33°F | 31% | 19% | 12 h 20 min |
| March 25 | 49°F | 33°F | 31% | 19% | 12 h 20 min |
| March 26 | 49°F | 33°F | 31% | 19% | 12 h 20 min |
| March 27 | 50°F | 33°F | 31% | 19% | 12 h 30 min |
| March 28 | 50°F | 34°F | 32% | 19% | 12 h 30 min |
| March 29 | 50°F | 34°F | 32% | 19% | 12 h 30 min |
| March 30 | 51°F | 34°F | 32% | 20% | 12 h 30 min |
| March 31 | 51°F | 34°F | 33% | 20% | 12 h 40 min |
- Normal high
- 47°FMarch average
- Normal low
- 31°FMarch average
- Precipitation
- 3.82 inmonth total
- Days with precipitation
- 90.01 inch or more
- Nights at 32°F or colder
- 19
- Daylight
- 11 h 10 min to 12 h 40 minMarch 1 to March 31
- Sunshine
- 69%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014707; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Groton in March?
On a given March day the chance of 0.01 inch or more is 30% on average, highest around March 31 (33%). In all, 3.82 in falls on 9 days of a normal March, 1 of them with an inch or more.
In a normal March in Groton, 19 nights fall to freezing and 2 days stay below freezing all day.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014707.
What are the records for March in Groton?
The warmest March temperature on this station's record (since 1999) is 74°F, on March 18, 2011; the coldest is 4°F, on March 6, 2015. The wettest March brought 12.12 in (2010).
The March mean against the 1991-2020 normal of 38.6°F: 2021 39.2°F (+0.6), 2022 41.5°F (+2.9), 2023 42.1°F (+3.5), 2024 44.4°F (+5.8), 2025 41.0°F (+2.4), 2026 39.0°F (+0.4). 6 of 6 ran warmer than normal.
| March | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 39.2°F | +0.6°F | 4.33 in |
| 2022 | 41.5°F | +2.9°F | 2.70 in |
| 2023 | 42.1°F | +3.5°F | 2.33 in |
| 2024 | 44.4°F | +5.8°F | 7.31 in |
| 2025 | 41.0°F | +2.4°F | 3.75 in |
| 2026 | 39.0°F | +0.4°F | 3.64 in |
Source: records: ACIS, station USW00014707; recent months: ACIS, station USW00014707. Records and recent months use complete months only.
How does March in Groton compare across Connecticut?
Across the 13 places PlainClimate covers in Connecticut, March normal highs run from 40°F in Norfolk to 49°F in Stamford; Groton's is 47°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.