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Boston Climate Guide
Elev: 0m   Long: 071°06'W   Lat: 42°22'N
J F M A M J J A S O N D
Maximum Daytime Temperature (°C) 1 °C (34°F) Maximum Daytime Temperature in January 3 °C (37°F) Maximum Daytime Temperature in February 8 °C (46°F) Maximum Daytime Temperature in March 14 °C (57°F) Maximum Daytime Temperature in April 20 °C (68°F) Maximum Daytime Temperature in May 25 °C (77°F) Maximum Daytime Temperature in June 28 °C (82°F) Maximum Daytime Temperature in July 27 °C (81°F) Maximum Daytime Temperature in August 23 °C (73°F) Maximum Daytime Temperature in September 17 °C (63°F) Maximum Daytime Temperature in October 11 °C (52°F) Maximum Daytime Temperature in November 4 °C (39°F) Maximum Daytime Temperature in December
Minimum Night-time Temperature (°C) -8 °C (18°F) Minimum Night-time Temperature in January -7 °C (19°F) Minimum Night-time Temperature in February -2 °C (28°F) Minimum Night-time Temperature in March 3 °C (37°F) Minimum Night-time Temperature in April 9 °C (48°F) Minimum Night-time Temperature in May 14 °C (57°F) Minimum Night-time Temperature in June 17 °C (63°F) Minimum Night-time Temperature in July 16 °C (61°F) Minimum Night-time Temperature in August 12 °C (54°F) Minimum Night-time Temperature in September 6 °C (43°F) Minimum Night-time Temperature in October 2 °C (36°F) Minimum Night-time Temperature in November -5 °C (23°F) Minimum Night-time Temperature in December
Hours of Sunshine 5 Hours of Sunshine per day (55% of Daylight Hours) in January 6 Hours of Sunshine per day (56% of Daylight Hours) in February 7 Hours of Sunshine per day (56% of Daylight Hours) in March 7 Hours of Sunshine per day (55% of Daylight Hours) in April 8 Hours of Sunshine per day (58% of Daylight Hours) in May 9 Hours of Sunshine per day (61% of Daylight Hours) in June 9 Hours of Sunshine per day (63% of Daylight Hours) in July 9 Hours of Sunshine per day (63% of Daylight Hours) in August 8 Hours of Sunshine per day (61% of Daylight Hours) in September 7 Hours of Sunshine per day (59% of Daylight Hours) in October 5 Hours of Sunshine per day (47% of Daylight Hours) in November 5 Hours of Sunshine per day (49% of Daylight Hours) in December
Hours of Daylight 10 Hours of Daylight in January 11 Hours of Daylight in February 12 Hours of Daylight in March 13 Hours of Daylight in April 15 Hours of Daylight in May 15 Hours of Daylight in June 15 Hours of Daylight in July 14 Hours of Daylight in August 12 Hours of Daylight in September 11 Hours of Daylight in October 10 Hours of Daylight in November 9 Hours of Daylight in December
Days with some Rain 11 Days with some Rain in January 10 Days with some Rain in February 11 Days with some Rain in March 11 Days with some Rain in April 12 Days with some Rain in May 11 Days with some Rain in June 9 Days with some Rain in July 10 Days with some Rain in August 9 Days with some Rain in September 9 Days with some Rain in October 11 Days with some Rain in November 12 Days with some Rain in December
Monthly Rainfall (mm) 93 mm (3.7 inches) Monthly Rainfall in January 93 mm (3.7 inches) Monthly Rainfall in February 97 mm (3.8 inches) Monthly Rainfall in March 93 mm (3.7 inches) Monthly Rainfall in April 85 mm (3.3 inches) Monthly Rainfall in May 80 mm (3.1 inches) Monthly Rainfall in June 75 mm (3.0 inches) Monthly Rainfall in July 85 mm (3.3 inches) Monthly Rainfall in August 82 mm (3.2 inches) Monthly Rainfall in September 87 mm (3.4 inches) Monthly Rainfall in October 111 mm (4.4 inches) Monthly Rainfall in November 105 mm (4.1 inches) Monthly Rainfall in December
Heat & Humidity / Chance of Frost Frost may occur in January Frost may occur in February Frost may occur in March Frost may occur in April No Heat & Humidity or Frost in May No Heat & Humidity or Frost in June Moderate Heat & Humidity in July Low Heat & Humidity in August No Heat & Humidity or Frost in September Frost may occur in October Frost may occur in November Frost may occur in December
UV Index (Maximum) UV 1 (Low) in January UV 2 (Low) in February UV 4 (Moderate) in March UV 5 (Moderate) in April UV 7 (High) in May UV 8 (Very High) in June UV 8 (Very High) in July UV 8 (Very High) in August UV 6 (High) in September UV 4 (Moderate) in October UV 2 (Low) in November UV 1 (Low) in December
Sea Temperature (°C) 5 °C (41°F) Sea Temperature in January 4 °C (39°F) Sea Temperature in February 3 °C (37°F) Sea Temperature in March 5 °C (41°F) Sea Temperature in April 8 °C (46°F) Sea Temperature in May 13 °C (55°F) Sea Temperature in June 17 °C (63°F) Sea Temperature in July 18 °C (64°F) Sea Temperature in August 16 °C (61°F) Sea Temperature in September 13 °C (55°F) Sea Temperature in October 10 °C (50°F) Sea Temperature in November 7 °C (45°F) Sea Temperature in December
J F M A M J J A S O N D

The Climate Guide for Boston shows historical weather averages for each month of the year. This includes max/min temperatures, monthly rainfall, number of days with rain/frost, daily hours of sunshine & daylight, heat & humidity, UV index for sun protection and sea temperature. This gives the best indication of what to expect from the weather on holiday in Boston.

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