March weather in Groton, CT
The average temperature in Groton in March is 38.6°F (30.7°F–46.6°F). Average precipitation: 3.82 inches.
March is a spring month in Groton, and is cooler than the annual average of 51.4°F. Daily temperatures swing about 15.9°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 11h 43m. For travel, March is cool.
Avg High
46.6°F
Avg Low
30.7°F
Precipitation
3.82 in
Daylight
11h 43m
March records in Groton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| March 1 | 55.9°F (2004) | 6.3°F (2015) | 0.36 in (2008) |
| March 2 | 57.0°F (2017) | 15.1°F (2026) | 2.11 in (2007) |
| March 3 | 66.9°F (2016) | 6.3°F (2015) | 0.93 in (2002) |
| March 4 | 53.1°F (2008) | 7.0°F (2003) | 0.74 in (2019) |
| March 5 | 54.0°F (2008) | 9.1°F (2009) | 0.62 in (2001) |
| March 6 | 57.0°F (2022) | 4.1°F (2015) | 1.01 in (2024) |
| March 7 | 61.0°F (2009) | 6.3°F (2015) | 0.90 in (2018) |
| March 8 | 63.0°F (2009) | 11.1°F (2019) | 1.87 in (2008) |
| March 9 | 64.0°F (2026) | 8.2°F (2007) | 0.67 in (2024) |
| March 10 | 64.9°F (2016) | 14.0°F (2003) | 0.61 in (2024) |
| March 11 | 64.9°F (2016) | 10.0°F (2003) | 1.86 in (2000) |
| March 12 | 63.0°F (2021) | 13.1°F (2017) | 0.40 in (2013) |
| March 13 | 64.9°F (2016) | 15.3°F (2017) | 2.06 in (2010) |
| March 14 | 66.0°F (2012) | 16.2°F (2014) | 1.23 in (2017) |
| March 15 | 63.0°F (2024) | 19.2°F (2017) | 0.28 in (2008) |
| March 16 | 61.0°F (2002) | 19.2°F (2021) | 0.86 in (2007) |
| March 17 | 62.1°F (2003) | 20.1°F (2014) | 1.96 in (2025) |
| March 18 | 73.9°F (2011) | 18.1°F (2014) | 1.02 in (2021) |
| March 19 | 63.0°F (2012) | 20.1°F (2015) | 0.91 in (2020) |
| March 20 | 69.1°F (2010) | 19.0°F (2004) | 0.74 in (2002) |
| March 21 | 63.0°F (2012) | 21.2°F (2006) | 1.52 in (2001) |
| March 22 | 66.9°F (2012) | 19.0°F (2002) | 0.94 in (2019) |
| March 23 | 68.0°F (2012) | 14.0°F (2004) | 2.34 in (2010) |
| March 24 | 60.1°F (2000) | 18.1°F (2014) | 1.05 in (2025) |
| March 25 | 57.9°F (2021) | 15.3°F (2014) | 0.21 in (2022) |
| March 26 | 69.1°F (2021) | 23.2°F (2011) | 0.54 in (2015) |
| March 27 | 69.1°F (2007) | 10.0°F (2000) | 0.67 in (2002) |
| March 28 | 61.0°F (2007) | 23.2°F (2022) | 2.09 in (2005) |
| March 29 | 62.1°F (2025) | 20.1°F (2022) | 3.19 in (2010) |
| March 30 | 62.1°F (2007) | 23.2°F (2008) | 3.42 in (2010) |
| March 31 | 62.1°F (2016) | 24.3°F (2023) | 2.34 in (2004) |