| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Record high °F (°C) | 74 (23) |
73 (23) |
89 (32) |
94 (34) |
97 (36) |
100 (38) |
104 (40) |
102 (39) |
102 (39) |
90 (32) |
83 (28) |
76 (24) |
104 (40) |
| Mean maximum °F (°C) | 58.3 (14.6) |
57.9 (14.4) |
67.0 (19.4) |
79.9 (26.6) |
88.1 (31.2) |
92.2 (33.4) |
95.0 (35.0) |
93.7 (34.3) |
88.9 (31.6) |
79.6 (26.4) |
70.2 (21.2) |
61.2 (16.2) |
96.4 (35.8) |
| Mean daily maximum °F (°C) | 36.8 (2.7) |
39.0 (3.9) |
45.5 (7.5) |
56.4 (13.6) |
66.5 (19.2) |
76.2 (24.6) |
82.1 (27.8) |
80.4 (26.9) |
73.1 (22.8) |
62.1 (16.7) |
51.6 (10.9) |
42.2 (5.7) |
59.3 (15.2) |
| Daily mean °F (°C) | 29.9 (−1.2) |
31.8 (−0.1) |
38.3 (3.5) |
48.6 (9.2) |
58.4 (14.7) |
68.0 (20.0) |
74.1 (23.4) |
72.7 (22.6) |
65.6 (18.7) |
54.8 (12.7) |
44.7 (7.1) |
35.7 (2.1) |
51.9 (11.1) |
| Mean daily minimum °F (°C) | 23.1 (−4.9) |
24.6 (−4.1) |
31.1 (−0.5) |
40.8 (4.9) |
50.3 (10.2) |
59.7 (15.4) |
66.0 (18.9) |
65.1 (18.4) |
58.2 (14.6) |
47.5 (8.6) |
37.9 (3.3) |
29.2 (−1.6) |
44.5 (6.9) |
| Mean minimum °F (°C) | 4.8 (−15.1) |
8.3 (−13.2) |
15.6 (−9.1) |
31.0 (−0.6) |
41.2 (5.1) |
49.7 (9.8) |
58.6 (14.8) |
57.7 (14.3) |
46.7 (8.2) |
35.1 (1.7) |
24.4 (−4.2) |
13.1 (−10.5) |
2.6 (−16.3) |
| Record low °F (°C) | −13 (−25) |
−18 (−28) |
−8 (−22) |
11 (−12) |
31 (−1) |
41 (5) |
50 (10) |
46 (8) |
34 (1) |
25 (−4) |
−2 (−19) |
−17 (−27) |
−18 (−28) |
| Average precipitation inches (mm) | 3.39 (86) |
3.21 (82) |
4.17 (106) |
3.63 (92) |
3.25 (83) |
3.89 (99) |
3.27 (83) |
3.23 (82) |
3.56 (90) |
4.03 (102) |
3.66 (93) |
4.30 (109) |
43.59 (1,107) |
| Average snowfall inches (cm) | 14.3 (36) |
14.4 (37) |
9.0 (23) |
1.6 (4.1) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.2 (0.51) |
0.7 (1.8) |
9.0 (23) |
49.2 (125) |
| Average precipitation days (≥ 0.01 in) | 11.8 | 10.6 | 11.6 | 11.6 | 11.8 | 10.9 | 9.4 | 9.0 | 9.0 | 10.5 | 10.3 | 11.9 | 128.4 |
| Average snowy days (≥ 0.1 in) | 6.6 | 6.2 | 4.4 | 0.8 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 0.6 | 4.2 | 23.0 |
| Average relative humidity (%) | 62.3 | 62.0 | 63.1 | 63.0 | 66.7 | 68.5 | 68.4 | 70.8 | 71.8 | 68.5 | 67.5 | 65.4 | 66.5 |
| Average dew point °F (°C) | 16.5 (−8.6) |
17.6 (−8.0) |
25.2 (−3.8) |
33.6 (0.9) |
45.0 (7.2) |
55.2 (12.9) |
61.0 (16.1) |
60.4 (15.8) |
53.8 (12.1) |
42.8 (6.0) |
33.4 (0.8) |
22.1 (−5.5) |
38.9 (3.8) |
| Mean monthly sunshine hours | 163.4 | 168.4 | 213.7 | 227.2 | 267.3 | 286.5 | 300.9 | 277.3 | 237.1 | 206.3 | 143.2 | 142.3 | 2,633.6 |
| Percent possible sunshine | 56 | 57 | 58 | 57 | 59 | 63 | 65 | 64 | 63 | 60 | 49 | 50 | 59 |
| Average ultraviolet index | 1 | 2 | 4 | 5 | 7 | 8 | 8 | 8 | 6 | 4 | 2 | 1 | 5 |
| Source 1: NOAA (relative humidity, dew point and sun 1961−1990)[2][3][4] | |||||||||||||
| Source 2: Weather Atlas (UV)[5] | |||||||||||||
| Climate data for Boston, Massachusetts | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Average sea temperature °F (°C) | 41.3 (5.2) |
38.1 (3.4) |
38.4 (3.5) |
43.1 (6.2) |
49.2 (9.5) |
58.4 (14.7) |
65.7 (18.7) |
67.9 (20.0) |
64.8 (18.2) |
59.4 (15.3) |
52.3 (11.3) |
46.6 (8.2) |
52.1 (11.2) |
| Source: Weather Atlas[5] | |||||||||||||
Notes
- ^ Mean monthly maxima and minima (i.e. the expected highest and lowest temperature readings at any point during the year or given month) calculated based on data at said location from 1991 to 2020.
- ^ Official records for Boston were kept at downtown from January 1872 to December 1935, and at Logan Airport (KBOS) since January 1936.[1]
References
- ^ ThreadEx
- ^ "Summary of Monthly Normals 1991–2020". National Oceanic and Atmospheric Administration. Retrieved May 4, 2021.
- ^ "NowData – NOAA Online Weather Data". National Oceanic and Atmospheric Administration. Retrieved May 24, 2021.
- ^ "WMO Climate Normals for BOSTON/LOGAN INT'L AIRPORT, MA 1961–1990". National Oceanic and Atmospheric Administration. Retrieved July 18, 2020.
- ^ a b "Boston, Massachusetts, USA - Monthly weather forecast and Climate data". Weather Atlas. Retrieved July 4, 2019.