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Boston Climate Guide
Massachusetts, United States
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Maximum Daytime Temperature (°C)
Minimum Night-time Temperature (°C)
1
1 °C (34°F) Maximum Daytime Temperature in January
3
3 °C (37°F) Maximum Daytime Temperature in February
8
8 °C (46°F) Maximum Daytime Temperature in March
14
14 °C (57°F) Maximum Daytime Temperature in April
20
20 °C (68°F) Maximum Daytime Temperature in May
25
25 °C (77°F) Maximum Daytime Temperature in June
28
28 °C (82°F) Maximum Daytime Temperature in July
27
27 °C (81°F) Maximum Daytime Temperature in August
23
23 °C (73°F) Maximum Daytime Temperature in September
17
17 °C (63°F) Maximum Daytime Temperature in October
11
11 °C (52°F) Maximum Daytime Temperature in November
4
4 °C (39°F) Maximum Daytime Temperature in December
J F M A M J J A S O N D
3
3 °C (37°F) Minimum Night-time Temperature in April
9
9 °C (48°F) Minimum Night-time Temperature in May
14
14 °C (57°F) Minimum Night-time Temperature in June
17
17 °C (63°F) Minimum Night-time Temperature in July
16
16 °C (61°F) Minimum Night-time Temperature in August
12
12 °C (54°F) Minimum Night-time Temperature in September
6
6 °C (43°F) Minimum Night-time Temperature in October
2
2 °C (36°F) Minimum Night-time Temperature in November
J F M A M J J A S O N D
-8 °C (18°F) Minimum Night-time Temperature in January
-8
-7 °C (19°F) Minimum Night-time Temperature in February
-7
-2 °C (28°F) Minimum Night-time Temperature in March
-2
-5 °C (23°F) Minimum Night-time Temperature in December
-5
Hours of Sunshine
Hours of Daylight
5
5 Hours of Sunshine (55% of Daylight Hours) in January
6
6 Hours of Sunshine (56% of Daylight Hours) in February
7
7 Hours of Sunshine (56% of Daylight Hours) in March
7
7 Hours of Sunshine (55% of Daylight Hours) in April
8
8 Hours of Sunshine (58% of Daylight Hours) in May
9
9 Hours of Sunshine (61% of Daylight Hours) in June
9
9 Hours of Sunshine (63% of Daylight Hours) in July
9
9 Hours of Sunshine (63% of Daylight Hours) in August
8
8 Hours of Sunshine (61% of Daylight Hours) in September
7
7 Hours of Sunshine (59% of Daylight Hours) in October
5
5 Hours of Sunshine (47% of Daylight Hours) in November
5
5 Hours of Sunshine (49% of Daylight Hours) in December
J F M A M J J A S O N D
10
10 Hours of Daylight in January
11
11 Hours of Daylight in February
12
12 Hours of Daylight in March
13
13 Hours of Daylight in April
15
15 Hours of Daylight in May
15
15 Hours of Daylight in June
15
15 Hours of Daylight in July
14
14 Hours of Daylight in August
12
12 Hours of Daylight in September
11
11 Hours of Daylight in October
10
10 Hours of Daylight in November
9
9 Hours of Daylight in December
J F M A M J J A S O N D
Days with some Rain
Monthly Rainfall (mm)
11
11 Days with some Rain in January
10
10 Days with some Rain in February
11
11 Days with some Rain in March
11
11 Days with some Rain in April
12
12 Days with some Rain in May
11
11 Days with some Rain in June
9
9 Days with some Rain in July
10
10 Days with some Rain in August
9
9 Days with some Rain in September
9
9 Days with some Rain in October
11
11 Days with some Rain in November
12
12 Days with some Rain in December
J F M A M J J A S O N D
93
93 mm (3.7 inches) Monthly Rainfall in January
93
93 mm (3.7 inches) Monthly Rainfall in February
97
97 mm (3.8 inches) Monthly Rainfall in March
93
93 mm (3.7 inches) Monthly Rainfall in April
85
85 mm (3.3 inches) Monthly Rainfall in May
80
80 mm (3.1 inches) Monthly Rainfall in June
75
75 mm (3.0 inches) Monthly Rainfall in July
85
85 mm (3.3 inches) Monthly Rainfall in August
82
82 mm (3.2 inches) Monthly Rainfall in September
87
87 mm (3.4 inches) Monthly Rainfall in October
111
111 mm (4.4 inches) Monthly Rainfall in November
105
105 mm (4.1 inches) Monthly Rainfall in December
J F M A M J J A S O N D
Heat & Humidity / Chance of Frost
UV Index (Maximum)
27
27 Days with Frost in January
25
25 Days with Frost in February
20
20 Days with Frost in March
9
9 Days with Frost in April
-
No Heat & Humidity or Frost in May
-
No Heat & Humidity or Frost in June
M
Moderate Heat & Humidity in July
L
Low Heat & Humidity in August
-
No Heat & Humidity or Frost in September
5
5 Days with Frost in October
13
13 Days with Frost in November
24
24 Days with Frost in December
J F M A M J J A S O N D
1
UV 1 (Low) in January
2
UV 2 (Low) in February
4
UV 4 (Moderate) in March
5
UV 5 (Moderate) in April
7
UV 7 (High) in May
8
UV 8 (Very High) in June
8
UV 8 (Very High) in July
8
UV 8 (Very High) in August
6
UV 6 (High) in September
4
UV 4 (Moderate) in October
2
UV 2 (Low) in November
1
UV 1 (Low) in December
J F M A M J J A S O N D
Sea Temperature (°C)
5
5 °C (41°F) Sea Temperature in January
4
4 °C (39°F) Sea Temperature in February
3
3 °C (37°F) Sea Temperature in March
5
5 °C (41°F) Sea Temperature in April
8
8 °C (46°F) Sea Temperature in May
13
13 °C (55°F) Sea Temperature in June
17
17 °C (63°F) Sea Temperature in July
18
18 °C (64°F) Sea Temperature in August
16
16 °C (61°F) Sea Temperature in September
13
13 °C (55°F) Sea Temperature in October
10
10 °C (50°F) Sea Temperature in November
7
7 °C (45°F) Sea Temperature in December
J F M A M J J A S O N D
Boston Climate Guide (Historical Weather Averages), Massachusetts, United States
Elev: 0 m   Long: 071°06'W   Lat: 42°22'N
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