Monthly Weather in Boston, United States
What is the average monthly temperature in Boston?
The average monthly temperature in Boston, Massachusetts, United States ranges from 1.9°C (35.4°F) in February to 23.8°C (74.9°F) in July. Boston temperature by month is given in the table below.
| Month | Celsius | Fahrenheit |
|---|---|---|
| January | 3.3°C | 37.9°F |
| February | 1.9°C | 35.4°F |
| March | 4.8°C | 40.6°F |
| April | 10.3°C | 50.5°F |
| May | 15.7°C | 60.3°F |
| June | 18.5°C | 65.3°F |
| July | 23.8°C | 74.8°F |
| August | 21.8°C | 71.2°F |
| September | 19.5°C | 67.1°F |
| October | 14.8°C | 58.6°F |
| November | 6.1°C | 43.0°F |
| December | 4.9°C | 40.8°F |
What is the hottest month in Boston?
The hottest months in Boston are July, August and September. During July the average temperature outside is 23.8°C (74.8°F), in August it is 21.8°C (71.2°F) and during September the air temperature is around 19.5°C (67.1°F).
What is the coldest month in Boston?
The coldest months in Boston are February, January and March. In February the average air temperature drops to 1.9°C (35.4°F), in January air temperature is 3.3°C (37.9°F) and during March it is 4.8°C (40.6°F).
How much does it rain on average in Boston?
On average it rains for 12 month(s) in Boston, United States with an average of 13.1 days of rain per month. In total Boston has 157 rainy days in a year.
When does it rain the most in Boston?
In Boston it rains the most during the following months.
- July - on average 6.26mm (0.25 inches) of rainfall per day.
- August - on average 4.83mm (0.19 inches) of rainfall per day.
- December - on average 4.75mm (0.19 inches) of rainfall per day.
- January - on average 4.42mm (0.17 inches) of rainfall per day.
- March - on average 3.54mm (0.14 inches) of rainfall per day.
- September - on average 3.25mm (0.13 inches) of rainfall per day.
Does it snow in Boston?
Yes, it snows in Boston. The following months have the most amount of snow.
- January. Boston has 1.14mm (0.04 inches) of snowfall and 0.6 mm (0.02 inches) of snow on the ground in January.
- February. Boston has 0.28mm (0.01 inches) of snowfall and 0.25 mm (0.01 inches) of snow on the ground in February.
- March. Boston has 0.25mm (0.01 inches) of snowfall and 0.23 mm (0.01 inches) of snow on the ground in March.
- December. Boston has 0.04mm (0 inches) of snowfall and 0 mm (0 inches) of snow on the ground in December.
When is it windy in Boston?
The windiest months in Boston, United States are March, February and April. In March the average windspeed is 32.3 km/h (20.1 mph), during February the windspeed is 31.5 km/h (19.6 mph) and in April the windspeed is 29.5 km/h (18.3 mph).
What are the least windy months in Boston?
The least windy months in Boston are October, September and July. In October the average windspeed is 23 km/h (14.3 mph), during September the windspeed is 23.8 km/h (14.8 mph) and in July the windspeed is 24.1 km/h (15 mph).
When is it cloudy in Boston?
The cloudiest months in Boston, United States are January, June and April. On average in January 83% of sky is covered by clouds, in June 77.7% is covered by clouds and in April clouds cover about 73% of sky.
When does Boston have the clearest sky?
Boston has the clearest sky in May, November and September. In May 49.8% of sky is covered by clouds, in November clouds cover around 56.9% and during September clouds cover about 66.1% of sky.
What is the average daylight duration in Boston?
The average daylight duration in Boston is 12 hours 12 minutes 24 seconds.
Which months have the most daylight in Boston?
The longest days in Boston are during June, July and May.
- June - 15 hours 13 minutes 37 seconds of daylight.
- July - 14 hours 55 minutes 13 seconds of daylight.
- May - 14 hours 36 minutes 15 seconds of daylight.
Which months have the least daylight in Boston?
The shortest days in Boston are during December, January and November.
- December - 9 hours 8 minutes 16 seconds of daylight.
- January - 9 hours 29 minutes 23 seconds of daylight.
- November - 9 hours 47 minutes 54 seconds of daylight.
What are the humidity levels in Boston throughout the year?
Humidity levels in Boston, United States range from 54.6% in May to 77.2% in June.
What are the pressure levels in Boston throughout the year?
Pressure levels in Boston change from 1011.1 mb (millibars) in June to 1018.9 mb in December.
What is the visibility in Boston throughout the year?
Visibility in Boston changes from lowest 13.2 km (8.2 miles) in January to highest 15.5 km (9.6 miles) in May.
What are the UV levels in Boston throughout the year?
UV levels change in Boston from 2.1 in January to 7.4 in May.
Which months have the highest UV levels in Boston throughout the year?
In Boston, United States the highest UV index is during May, July and August. During May the average UV index is 7.4, in July UV level is 6.9 and in August UV index is around 6.5.
Which months have the lowest UV levels in Boston throughout the year?
The lowest UV levels in Boston are in January, December and February. In January the average UV index is around 2.1, in December UV index is 2.7 and during February UV level is 3.5.