weather by month, temperature, precipitation, when to go (2022)

weather by month, temperature, precipitation, when to go (1)weather by month, temperature, precipitation, when to go (2)

In Boston, the capital of the State of Massachusetts, the climate is continental, with very cold, snowy winters and warm to hot summers, during which there are quite frequent thunderstorms. The city is located at 42 degrees north latitude, on the coast of the Atlantic Ocean (Gulf of Maine), where a cold current flows. Also, in this area, different air masses collide: those coming from Canada and those coming from the Gulf of Mexico. The result is an unstable climate, with waves of bad weather alternating with clear and sunny days.
At the Logan International Airport, located right on the coast, the daily average temperature ranges from -1 °C (30 °F) in January to 23.5 °C (74 °F) in July. Here are the average temperatures.

Boston - Average temperatures (1991-2020)
MonthMin (°C)Max (°C)Mean (°C)Min (°F)Max (°F)Mean (°F)
January-4.92.7-1.1233730
February-4.13.9-0.1253931.8
March-0.57.53.5314638.3
April4.913.69.2415648.7
May10.219.214.7506758.5
June15.424.620607668
July18.927.823.4668274
August18.426.922.6658072.8
September14.622.818.7587365.7
October8.616.712.6476254.8
November3.310.97.1385244.8
December-1.65.72294235.7
Year715.311.144.659.552

The airport is in the mildest area of the city; in inland neighborhoods and suburbs, night temperatures are lower, as can be seen from the average temperatures of Bedford, located 25 km (15 mi) to the north-west.

Bedford - Average temperatures (1991-2020)
MonthMin (°C)Max (°C)Mean (°C)Min (°F)Max (°F)Mean (°F)
January-83-2.5183727.5
February-7.24.4-1.4194029.6
March-2.98.93274837.4
April2.416.19.2366148.7
May7.921.514.7467158.4
June12.826.319.6557967.2
July16.229.622.9618573.2
August15.428.822.1608471.8
September11.224.717.9527664.3
October517.811.4416452.5
November0.2126.1325442.9
December-4.85.90.6234333
Year4.116.610.3539.46250.5

Precipitation in Boston is quite abundant, since it amounts to 1,100 millimeters (43 inches) per year, and it's well distributed over the seasons. In winter, it occurs mainly in the form of snow, while in summer, in addition to some weather disturbances that can bring some rainy days, thunderstorms in the afternoon or in the evening are quite frequent. Here is the average precipitation.

Boston - Average precipitation
MonthMillimetersInchesDays
January853.312
February803.111
March1054.112
April903.512
May853.312
June1003.911
July853.39
August803.19
September903.59
October1003.910
November953.710
December1104.312
Year110543.5128

Winter, from December to mid-March, is very cold: the average temperature is just below freezing (0 °C or 32 °F), but cold spells, with temperatures dropping to -15 °C (5 °F) or even below, are not uncommon. The cold record is -24.5 °C (-12 °F), recorded in January 1957. From 2001 to 2020, the record was -23 °C (-9.5 °F), set in February 2016.
The freezing wind, called blizzard, can heighten the feeling of cold.
Snowfalls are frequent, and sometimes can be abundant, resulting in real snowstorms: for example, during the storm of the 17/18th of February 2003, 70 centimeters (27 inches) of snow fell, while on the 1st of April 1997, 64.5 cm (25.4 in) of snow fell, and on the 26/27th of January 2015, 62.5 cm (24.6 in) of snow fell. Snow covers the ground for weeks. An average of 125 cm (49 in) of snow falls per year.
On other occasions, the south wind can bring some mild days, during which highs can reach 12/15 °C (54/59 °F), but this occurs less frequently than in New York.

In spring, from mid-March to mid-June, the weather continues to be unstable: the first warm days alternate with the return of cold weather. In March, which is often still a wintery month, it snows on a frequent basis, and sometimes, this can happen even in April, especially at the beginning of the month. But already in April, the temperature can sometimes reach or even exceed 25 °C (77 °F).
By May, the average temperature is pleasant, although there are still cool days, or even cold and rainy, while the first heat waves can raise the temperature above 30 °C (86 °F). On sunny days, also the first afternoon thunderstorms can erupt. In late spring and early summer, fog may form, maybe on rainy days. When the weather is fine, in the afternoon, a cool and moderate breeze rises from the sea.
The Boston Marathon is held on the third Monday of April, ie around the middle of the month, when the average temperatures are very cool or even a little cold: in April, the average is 5 °C (41 °F) as minimum temperature and 13.5 °C (56.5 °F) as maximum temperature.

Summer, from mid-June to August, is warm to hot and humid. Different situations can occur in this season as well: there are cool days, maybe with some rain, and with highs around 23/24 °C (73/75 °F), but also hot and quite muggy days, with highs around 28 °C (82 °F), with sunshine and the sea breeze.
Sometimes, even heat waves can occur, with daytime temperatures reaching or exceeding 35 °C (95 °F), and night temperatures remaining around 23/25 °C (73/77 °F). The record heat is 39.5 °C (103 °F), recorded in July 2011.
The amount of sunshine during the summer is good, however, in addition to some weather fronts, there is a fair amount of afternoon thunderstorms, sometimes intense and accompanied by hail.

Autumn, from September to November, is the mildest and less unstable season of the year, at least in the first part. In early September, the weather can still be characterized by heat and humidity, with sunshine and some afternoon thunderstorms, then it quickly becomes mild until mid-October, while in the second half of October, it can start to be a bit cold. November is already a cold month, and the first snowfalls can occur. Rainfall occurs quite often also in this season.

weather by month, temperature, precipitation, when to go (3)

The amount of sunshine in Boston is good in summer, but it is not scarce even in winter because, as mentioned, some sunny days can always occur. On average, there are 2,635 hours of sunshine per year. Here are the average sunshine hours per day.

Boston - Sunshine hours
MonthAverageTotal
January5.5165February6170March7215April7.5225May8.5265June9.5285July9.5300August9275September8235October6.5205November5145December4.5140Year7.22635

The sea in Boston, very cold in winter, remains very cool even in summer, in fact, it reaches 20 °C (68 °F) in August. As mentioned, a cold current flows in the sea, in fact, the Gulf of Maine in winter is affected by an offshoot of the Labrador current. Here are the average sea temperatures.


Best Time

In order to avoid both the winter cold and the summer heat, the best times to visit Boston are spring and autumn, and in particular from mid-May to mid-June, and from early September to early October. June is often a good month too, but we can not exclude some hot days. In early September, the weather is often hot and humid, although not as hot as in midsummer. In May, it can sometimes get cold, and the weather can be unstable, especially at the beginning of the month, while generally, the second half of the month is mild.
In autumn (usually around late October), you can admire the beautiful colors of the trees losing their leaves (the phenomenon called fall foliage).

Boston - Weather by month

Based on the period 1991-2020

(January - February - March - April - May - June - July - August - September - October - November - December)


In January, the coldest month of the year, the weather in Boston is usually very cold. The average temperature is of -1.1 °C (30 °F), with a minimum of -4.9 °C (23.2 °F) and a maximum of 2.7 °C (36.9 °F).
weather by month, temperature, precipitation, when to go (4)On the coldest nights of the month, the temperature usually drops to around -15 °C (5 °F).
weather by month, temperature, precipitation, when to go (5)On the warmest days of the month, the temperature usually reaches around 14.5 °C (58.5 °F).
Precipitation amounts to 85 mm (3.3 in), distributed over 12 days.
The day lasts on average 9 hours and 30 minutes.
weather by month, temperature, precipitation, when to go (6)There are on average 5.5 hours of sunshine per day. So, the sun shines 55% of the time.
The average humidity is 62%.
The average wind speed is 19 kph (12 mph).
weather by month, temperature, precipitation, when to go (7)The average sea temperature is of 5.5 °C (41.5 °F). Therefore, the sea is very cold for swimming.


In February, the weather in Boston is usually very cold. The average temperature is of -0.1 °C (32 °F), with a minimum of -4.1 °C (24.6 °F) and a maximum of 3.9 °C (39 °F).
weather by month, temperature, precipitation, when to go (8)On the coldest nights of the month, the temperature usually drops to around -13 °C (8 °F).
weather by month, temperature, precipitation, when to go (9)On the warmest days of the month, the temperature usually reaches around 14.5 °C (58 °F).
Precipitation amounts to 80 mm (3.1 in), distributed over 11 days.
The day lasts on average 10 hours and 35 minutes.
weather by month, temperature, precipitation, when to go (10)There are on average 6 hours of sunshine per day. So, the sun shines 57% of the time.
The average humidity is 62%.
The average wind speed is 19 kph (12 mph).
weather by month, temperature, precipitation, when to go (11)The average sea temperature is of 4 °C (39 °F). Therefore, the sea is very cold for swimming.


In March, the weather in Boston is usually cold. The average temperature is of 3.5 °C (38 °F), with a minimum of -0.5 °C (31.1 °F) and a maximum of 7.5 °C (45.5 °F).
weather by month, temperature, precipitation, when to go (12)On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -9 °C (15.5 °F).
weather by month, temperature, precipitation, when to go (13)On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 19.5 °C (67 °F).
Precipitation amounts to 105 mm (4.1 in), distributed over 12 days.
The day lasts on average 12 hours and 0 minutes.
weather by month, temperature, precipitation, when to go (14)There are on average 7 hours of sunshine per day. So, the sun shines 57% of the time.
The average humidity is 63%.
The average wind speed is 19 kph (12 mph).
weather by month, temperature, precipitation, when to go (15)The average sea temperature is of 3.5 °C (38.5 °F). Therefore, the sea is very cold for swimming.


In April, the weather in Boston is usually mild. The average temperature is of 9.2 °C (49 °F), with a minimum of 4.9 °C (40.8 °F) and a maximum of 13.6 °C (56.5 °F).
weather by month, temperature, precipitation, when to go (16)On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -0.5 °C (31 °F).
weather by month, temperature, precipitation, when to go (17)On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 26.5 °C (80 °F).
Precipitation amounts to 90 mm (3.5 in), distributed over 12 days.
The day lasts on average 13 hours and 25 minutes.
weather by month, temperature, precipitation, when to go (18)There are on average 7.5 hours of sunshine per day. So, the sun shines 56% of the time.
The average humidity is 63%.
The average wind speed is 19 kph (12 mph).
weather by month, temperature, precipitation, when to go (19)The average sea temperature is of 5 °C (41.5 °F). Therefore, the sea is very cold for swimming.


In May, the weather in Boston is usually very mild. The average temperature is of 14.7 °C (58 °F), with a minimum of 10.2 °C (50.4 °F) and a maximum of 19.2 °C (66.6 °F).
weather by month, temperature, precipitation, when to go (20)On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 5 °C (41 °F).
weather by month, temperature, precipitation, when to go (21)On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 31 °C (88 °F).
Precipitation amounts to 85 mm (3.3 in), distributed over 12 days.
The day lasts on average 14 hours and 35 minutes. So the days are long.
weather by month, temperature, precipitation, when to go (22)There are on average 8.5 hours of sunshine per day. So, the sun shines 59% of the time.
The average humidity is 67%.
The average wind speed is 17 kph (11 mph).
weather by month, temperature, precipitation, when to go (23)The average sea temperature is of 9 °C (48.5 °F). Therefore, the sea is very cold for swimming.


In June, the weather in Boston is usually warm. The average temperature is of 20 °C (68 °F), with a minimum of 15.4 °C (59.7 °F) and a maximum of 24.6 °C (76.3 °F).
weather by month, temperature, precipitation, when to go (24)On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 10 °C (49.5 °F).
weather by month, temperature, precipitation, when to go (25)On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 33.5 °C (92 °F).
Precipitation amounts to 100 mm (3.9 in), distributed over 11 days.
The day lasts on average 15 hours and 10 minutes. So the days are long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
weather by month, temperature, precipitation, when to go (26)There are on average 9.5 hours of sunshine per day. So, the sun shines 63% of the time.
The average humidity is 68%.
The average wind speed is 16 kph (10 mph).
weather by month, temperature, precipitation, when to go (27)The average sea temperature is of 14 °C (57 °F). Therefore, the sea is very cold for swimming.


In July, the warmest month of the year, the weather in Boston is usually warm to hot. The average temperature is of 23.4 °C (74 °F), with a minimum of 18.9 °C (66 °F) and a maximum of 27.8 °C (82 °F).
weather by month, temperature, precipitation, when to go (28)On the coldest nights of the month, the temperature usually drops to around 15 °C (58.5 °F).
weather by month, temperature, precipitation, when to go (29)On the warmest days of the month, the temperature usually reaches around 35 °C (95 °F).
Precipitation amounts to 85 mm (3.3 in), distributed over 9 days.
The day lasts on average 14 hours and 55 minutes. So the days are long.
weather by month, temperature, precipitation, when to go (30)There are on average 9.5 hours of sunshine per day. So, the sun shines 65% of the time.
The average humidity is 68%.
The average wind speed is 15 kph (9 mph).
weather by month, temperature, precipitation, when to go (31)The average sea temperature is of 18.5 °C (65.5 °F). Therefore, the sea is very cool for swimming.


In August, the weather in Boston is usually warm to hot and muggy. The average temperature is of 22.6 °C (73 °F), with a minimum of 18.4 °C (65.1 °F) and a maximum of 26.9 °C (80.4 °F).
weather by month, temperature, precipitation, when to go (32)On the coldest nights of the month, the temperature usually drops to around 14.5 °C (57.5 °F).
weather by month, temperature, precipitation, when to go (33)On the warmest days of the month, the temperature usually reaches around 34.5 °C (93.5 °F).
Precipitation amounts to 80 mm (3.1 in), distributed over 9 days.
The day lasts on average 13 hours and 50 minutes.
weather by month, temperature, precipitation, when to go (34)There are on average 9 hours of sunshine per day. So, the sun shines 65% of the time.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is 14 kph (9 mph).
weather by month, temperature, precipitation, when to go (35)The average sea temperature is of 20 °C (67.5 °F). Therefore, the sea is very cool for swimming.


In September, the weather in Boston is usually warm. The average temperature is of 18.7 °C (66 °F), with a minimum of 14.6 °C (58.3 °F) and a maximum of 22.8 °C (73 °F).
weather by month, temperature, precipitation, when to go (36)On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 8 °C (47 °F).
weather by month, temperature, precipitation, when to go (37)On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 31.5 °C (89 °F).
Precipitation amounts to 90 mm (3.5 in), distributed over 9 days.
The day lasts on average 12 hours and 25 minutes.
weather by month, temperature, precipitation, when to go (38)There are on average 8 hours of sunshine per day. So, the sun shines 64% of the time.
The average humidity is 72%. Hence, the air is normally humid.
The average wind speed is 15 kph (9 mph).
weather by month, temperature, precipitation, when to go (39)The average sea temperature is of 18 °C (64 °F). Therefore, the sea is cold for swimming.


In October, the weather in Boston is usually mild. The average temperature is of 12.6 °C (55 °F), with a minimum of 8.6 °C (47.5 °F) and a maximum of 16.7 °C (62.1 °F).
weather by month, temperature, precipitation, when to go (40)On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 1.5 °C (35 °F).
weather by month, temperature, precipitation, when to go (41)On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 26.5 °C (79.5 °F).
Precipitation amounts to 100 mm (3.9 in), distributed over 10 days.
The day lasts on average 11 hours and 0 minutes.
weather by month, temperature, precipitation, when to go (42)There are on average 6.5 hours of sunshine per day. So, the sun shines 60% of the time.
The average humidity is 68%.
The average wind speed is 16 kph (10 mph).
weather by month, temperature, precipitation, when to go (43)The average sea temperature is of 14 °C (57.5 °F). Therefore, the sea is very cold for swimming.


In November, the weather in Boston is usually quite mild. The average temperature is of 7.1 °C (45 °F), with a minimum of 3.3 °C (37.9 °F) and a maximum of 10.9 °C (51.6 °F).
weather by month, temperature, precipitation, when to go (44)On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around -4 °C (24.5 °F).
weather by month, temperature, precipitation, when to go (45)On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 21 °C (70 °F).
Precipitation amounts to 95 mm (3.7 in), distributed over 10 days.
The day lasts on average 9 hours and 50 minutes.
weather by month, temperature, precipitation, when to go (46)There are on average 5 hours of sunshine per day. So, the sun shines 49% of the time.
The average humidity is 68%.
The average wind speed is 18 kph (11 mph).
weather by month, temperature, precipitation, when to go (47)The average sea temperature is of 10.5 °C (51.5 °F). Therefore, the sea is very cold for swimming.


In December, the weather in Boston is usually cold. The average temperature is of 2.0 °C (36 °F), with a minimum of -1.6 °C (29.1 °F) and a maximum of 5.7 °C (42.3 °F).
weather by month, temperature, precipitation, when to go (48)On the coldest nights of the month, the temperature usually drops to around -10.5 °C (13 °F).
weather by month, temperature, precipitation, when to go (49)On the warmest days of the month, the temperature usually reaches around 16 °C (61 °F).
Precipitation amounts to 110 mm (4.3 in), distributed over 12 days.
The day lasts on average 9 hours and 5 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
weather by month, temperature, precipitation, when to go (50)There are on average 4.5 hours of sunshine per day. So, the sun shines 51% of the time.
The average humidity is 65%.
The average wind speed is 18 kph (11 mph).
weather by month, temperature, precipitation, when to go (51)The average sea temperature is of 8 °C (46 °F). Therefore, the sea is very cold for swimming.

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