| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Record high °F (°C) | 68 (20) |
71 (22) |
89 (32) |
94 (34) |
96 (36) |
99 (37) |
100 (38) |
101 (38) |
99 (37) |
88 (31) |
81 (27) |
74 (23) |
101 (38) |
| Mean maximum °F (°C) | 56.6 (13.7) |
56.9 (13.8) |
65.6 (18.7) |
79.4 (26.3) |
87.3 (30.7) |
90.0 (32.2) |
92.9 (33.8) |
91.3 (32.9) |
86.9 (30.5) |
77.6 (25.3) |
68.4 (20.2) |
60.0 (15.6) |
94.7 (34.8) |
| Mean daily maximum °F (°C) | 34.7 (1.5) |
37.0 (2.8) |
44.1 (6.7) |
56.3 (13.5) |
66.8 (19.3) |
75.4 (24.1) |
81.7 (27.6) |
80.2 (26.8) |
72.7 (22.6) |
61.0 (16.1) |
50.1 (10.1) |
40.2 (4.6) |
58.4 (14.6) |
| Daily mean °F (°C) | 26.5 (−3.1) |
28.2 (−2.1) |
35.5 (1.9) |
47.1 (8.4) |
58.5 (14.7) |
66.5 (19.2) |
72.7 (22.6) |
71.4 (21.9) |
64.2 (17.9) |
52.5 (11.4) |
42.0 (5.6) |
32.5 (0.3) |
49.8 (9.9) |
| Mean daily minimum °F (°C) | 18.3 (−7.6) |
19.5 (−6.9) |
26.9 (−2.8) |
37.9 (3.3) |
48.2 (9.0) |
57.6 (14.2) |
63.8 (17.7) |
62.6 (17.0) |
55.6 (13.1) |
44.0 (6.7) |
33.8 (1.0) |
24.9 (−3.9) |
41.1 (5.1) |
| Mean minimum °F (°C) | 0.0 (−17.8) |
3.1 (−16.1) |
10.1 (−12.2) |
26.7 (−2.9) |
37.5 (3.1) |
45.9 (7.7) |
54.9 (12.7) |
53.4 (11.9) |
42.3 (5.7) |
30.5 (−0.8) |
19.6 (−6.9) |
8.7 (−12.9) |
−2.5 (−19.2) |
| Record low °F (°C) | −14 (−26) |
−21 (−29) |
−5 (−21) |
6 (−14) |
27 (−3) |
36 (2) |
44 (7) |
39 (4) |
28 (−2) |
21 (−6) |
5 (−15) |
−19 (−28) |
−21 (−29) |
| Average precipitation inches (mm) | 4.50 (114) |
4.00 (102) |
5.52 (140) |
4.76 (121) |
3.82 (97) |
4.63 (118) |
3.47 (88) |
3.91 (99) |
4.06 (103) |
5.49 (139) |
4.31 (109) |
5.39 (137) |
53.86 (1,367) |
| Average snowfall inches (cm) | 18.6 (47) |
18.2 (46) |
15.0 (38) |
2.8 (7.1) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.7 (1.8) |
1.8 (4.6) |
12.6 (32) |
69.7 (176.5) |
| Average extreme snow depth inches (cm) | 10.6 (27) |
11.5 (29) |
9.8 (25) |
2.6 (6.6) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.3 (0.76) |
1.3 (3.3) |
7.7 (20) |
17.1 (43) |
| Average precipitation days (≥ 0.01 in) | 13.2 | 11.3 | 12.5 | 12.5 | 13.0 | 12.1 | 10.5 | 10.2 | 9.2 | 11.5 | 10.9 | 12.6 | 139.5 |
| Average snowy days (≥ 0.1 in) | 8.1 | 7.1 | 5.7 | 1.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.4 | 1.3 | 5.3 | 29.2 |
| Mean monthly sunshine hours | 132.1 | 146.7 | 174.0 | 185.6 | 220.2 | 231.8 | 258.1 | 242.5 | 204.1 | 182.1 | 133.3 | 125.9 | 2,236.4 |
| Percent possible sunshine | 46.3 | 50.9 | 48.5 | 47.9 | 50.4 | 52.7 | 58.0 | 58.7 | 56.7 | 55.1 | 47.0 | 45.9 | 51.5 |
| Source: NOAA, BHO[1][2] | |||||||||||||
References
- ^ "U.S. Climate Normals Quick Access – Station: Blue Hill COOP, MA". National Oceanic and Atmospheric Administration. Retrieved February 10, 2023.
- ^ "Blue Hill Observatory daily sunshine data". Blue Hill Meteorological Observatory. Retrieved October 11, 2015.