Boston Weather in March

March is a transition month for weather in Boston, Massachusetts. The city sees the last of winter's major snowstorms and the first of the year's thunderstorms. While nighttime low temperatures often dip below freezing, the days do warm up noticeably during the month.

This page gives detailed information on the typical March weather for Boston.

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The numbers here are historical averages based on climate data gathered at Boston's Logan International Airport, located on the waterfront next to Boston Harbor.

Temperature Weather iconTemperature

45 °F March average high 7 °C
31 °F March average low 0 °C

In most years, Boston averages a daily maximum temperature for March that's between 42 and 48 degrees Fahrenheit (6 to 9 degrees Celsius). The minimum temperature usually falls between 29 and 34 °F (-2 to 1 °C).

The days at Boston start to warm more quickly during March. By the end of the month, the temperature has climbed around 8 °F (5 °C) above what it was at the start.

9 days 50 °F max. or more (10 °C)
15 days 32 °F min. or less (0 °C)

Boston averages just one day in March when the thermometer reaches into the 70s °F (over 20 °C). A March temperature above 80 °F (27 °C) is a once in a decade event. Typically on 2 days the mercury remains below freezing for the entire day.

At night, the thermometer dips to 20 °F (-8 °C) or below on 3 days. Every few years, March can get as cold as 10 °F (-12 °C).

Rainy Weather iconPrecipitation

4.3 in total precipitation 110 mm
12 days of rain or snowfall

Half the time, Boston receives 3 to 5 inches (64 to 118 mm) of precipitation in March. One in four years has drier weather, while another one in four is wetter. March is the wettest month of the year in Boston.

Snowy Weather iconSnow

7.8 in total snowfall 19.8 cm
4 days with new snow

March's snowfall varies a lot from year to year in Boston. Between 2 and 11 inches (5 to 27 cm) of fresh snow arrives in half the years. Less new snow lands in one out of four Marches, while another twenty-five percent are snowier.

Boston typically has at least an inch (2.5 cm) of snow on the ground for 6 days this month. The snow normally accumulates to 5 inches (13 cm) or deeper on 2 days.

Sunny Weather iconSun

57 % sunshine
8 days clear skies

The sun's rays reach the ground in Boston during 57 percent of daylight hours on average in March, for a total of 211 hours in the month. Typically on 8 days this month the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in March at Boston lasts for 11 hours and 58 minutes a day on average. The shortest day of the month is the 1st with 11 hours and 15 minutes of daylight. By the end of the month, the days have lengthened to 12:42 from sunrise to sunset. These durations can vary by a minute or two from year to year.

Humid Weather iconHumidity

63 % March average humidity

The relative humidity in Boston during March usually peaks at 69 percent in the morning then drops to 56 percent by early afternoon.

Local Time1 am4 am7 am10 am1 pm4 pm7 pm10 pm
Humidity % 67 69 69 60 56 56 62 65

Windy Weather iconWind

13.6 mph March wind speed average 21.9 kph

March is a little windier than most other months in Boston.

Stormy Weather iconStorms

1 day snowfall of 5 inches (13 cm) or more
1 day with thunderstorms in March

In March, Boston often sees the last of winter's substantial snowfalls plus the first thunderstorm of the year.


These weather data are long-term historical averages provided by the National Climatic Data Center of the United States. The temperature and precipitation numbers are 1981-2010 normals while the humidity and thunderstorm statistics are 1961-1990 normals.

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