Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Record high °F (°C) | 72 (22) |
78 (26) |
86 (30) |
96 (36) |
99 (37) |
101 (38) |
106 (41) |
104 (40) |
102 (39) |
94 (34) |
84 (29) |
75 (24) |
106 (41) |
Mean maximum °F (°C) | 60.4 (15.8) |
60.7 (15.9) |
70.3 (21.3) |
82.9 (28.3) |
88.5 (31.4) |
92.1 (33.4) |
95.7 (35.4) |
93.4 (34.1) |
89.0 (31.7) |
79.7 (26.5) |
70.7 (21.5) |
62.9 (17.2) |
97.0 (36.1) |
Mean daily maximum °F (°C) | 39.5 (4.2) |
42.2 (5.7) |
49.9 (9.9) |
61.8 (16.6) |
71.4 (21.9) |
79.7 (26.5) |
84.9 (29.4) |
83.3 (28.5) |
76.2 (24.6) |
64.5 (18.1) |
54.0 (12.2) |
44.3 (6.8) |
62.6 (17.0) |
Daily mean °F (°C) | 33.7 (0.9) |
35.9 (2.2) |
42.8 (6.0) |
53.7 (12.1) |
63.2 (17.3) |
72.0 (22.2) |
77.5 (25.3) |
76.1 (24.5) |
69.2 (20.7) |
57.9 (14.4) |
48.0 (8.9) |
39.1 (3.9) |
55.8 (13.2) |
Mean daily minimum °F (°C) | 27.9 (−2.3) |
29.5 (−1.4) |
35.8 (2.1) |
45.5 (7.5) |
55.0 (12.8) |
64.4 (18.0) |
70.1 (21.2) |
68.9 (20.5) |
62.3 (16.8) |
51.4 (10.8) |
42.0 (5.6) |
33.8 (1.0) |
48.9 (9.4) |
Mean minimum °F (°C) | 9.8 (−12.3) |
12.7 (−10.7) |
19.7 (−6.8) |
32.8 (0.4) |
43.9 (6.6) |
52.7 (11.5) |
61.8 (16.6) |
60.3 (15.7) |
50.2 (10.1) |
38.4 (3.6) |
27.7 (−2.4) |
18.0 (−7.8) |
7.7 (−13.5) |
Record low °F (°C) | −6 (−21) |
−15 (−26) |
3 (−16) |
12 (−11) |
32 (0) |
44 (7) |
52 (11) |
50 (10) |
39 (4) |
28 (−2) |
5 (−15) |
−13 (−25) |
−15 (−26) |
Average precipitation inches (mm) | 3.64 (92) |
3.19 (81) |
4.29 (109) |
4.09 (104) |
3.96 (101) |
4.54 (115) |
4.60 (117) |
4.56 (116) |
4.31 (109) |
4.38 (111) |
3.58 (91) |
4.38 (111) |
49.52 (1,258) |
Average snowfall inches (cm) | 8.8 (22) |
10.1 (26) |
5.0 (13) |
0.4 (1.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.1 (0.25) |
0.5 (1.3) |
4.9 (12) |
29.8 (76) |
Average extreme snow depth inches (cm) | 5.8 (15) |
7.9 (20) |
4.4 (11) |
0.4 (1.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.4 (1.0) |
3.7 (9.4) |
12.3 (31) |
Average precipitation days (≥ 0.01 in) | 10.8 | 10.0 | 11.1 | 11.4 | 11.5 | 11.2 | 10.5 | 10.0 | 8.8 | 9.5 | 9.2 | 11.4 | 125.4 |
Average snowy days (≥ 0.1 in) | 3.7 | 3.2 | 2.0 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 2.1 | 11.4 |
Average relative humidity (%) | 61.5 | 60.2 | 58.5 | 55.3 | 62.7 | 65.2 | 64.2 | 66.0 | 67.8 | 65.6 | 64.6 | 64.1 | 63.0 |
Average dew point °F (°C) | 18.0 (−7.8) |
19.0 (−7.2) |
25.9 (−3.4) |
34.0 (1.1) |
47.3 (8.5) |
57.4 (14.1) |
61.9 (16.6) |
62.1 (16.7) |
55.6 (13.1) |
44.1 (6.7) |
34.0 (1.1) |
24.6 (−4.1) |
40.3 (4.6) |
Mean monthly sunshine hours | 162.7 | 163.1 | 212.5 | 225.6 | 256.6 | 257.3 | 268.2 | 268.2 | 219.3 | 211.2 | 151.0 | 139.0 | 2,534.7 |
Percent possible sunshine | 54 | 55 | 57 | 57 | 57 | 57 | 59 | 63 | 59 | 61 | 51 | 48 | 57 |
Average ultraviolet index | 2 | 3 | 4 | 6 | 7 | 8 | 8 | 8 | 6 | 4 | 2 | 1 | 5 |
Source 1: NOAA (relative humidity and sun 1961–1990; dew point 1965–1984)[2][3][4] | |||||||||||||
Source 2: Weather Atlas[5]. |
Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Average sea temperature °F (°C) |
41.7 (5.4) |
39.7 (4.3) |
40.2 (4.5) |
45.1 (7.3) |
52.5 (11.4) |
64.5 (18.1) |
72.1 (22.3) |
74.1 (23.4) |
70.1 (21.2) |
63.0 (17.2) |
54.3 (12.4) |
47.2 (8.4) |
55.4 (13.0) |