Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Record high °F (°C) | 88 (31) |
91 (33) |
99 (37) |
98 (37) |
98 (37) |
101 (38) |
100 (38) |
98 (37) |
111 (44) |
107 (42) |
100 (38) |
88 (31) |
111 (44) |
Mean maximum °F (°C) | 78.8 (26.0) |
78.6 (25.9) |
80.2 (26.8) |
82.1 (27.8) |
79.3 (26.3) |
79.6 (26.4) |
82.9 (28.3) |
85.2 (29.6) |
90.6 (32.6) |
87.8 (31.0) |
85.4 (29.7) |
77.0 (25.0) |
94.0 (34.4) |
Mean daily maximum °F (°C) | 66.4 (19.1) |
66.2 (19.0) |
67.0 (19.4) |
68.8 (20.4) |
69.5 (20.8) |
71.7 (22.1) |
75.3 (24.1) |
77.3 (25.2) |
77.2 (25.1) |
74.6 (23.7) |
70.7 (21.5) |
66.0 (18.9) |
70.9 (21.6) |
Daily mean °F (°C) | 58.4 (14.7) |
59.0 (15.0) |
60.7 (15.9) |
62.9 (17.2) |
64.8 (18.2) |
67.2 (19.6) |
70.7 (21.5) |
72.4 (22.4) |
71.7 (22.1) |
68.1 (20.1) |
62.7 (17.1) |
57.9 (14.4) |
64.7 (18.2) |
Mean daily minimum °F (°C) | 50.3 (10.2) |
51.8 (11.0) |
54.5 (12.5) |
57.1 (13.9) |
60.0 (15.6) |
62.6 (17.0) |
66.1 (18.9) |
67.5 (19.7) |
66.2 (19.0) |
61.5 (16.4) |
54.8 (12.7) |
49.8 (9.9) |
58.5 (14.7) |
Mean minimum °F (°C) | 43.7 (6.5) |
46.1 (7.8) |
48.7 (9.3) |
51.9 (11.1) |
55.8 (13.2) |
59.3 (15.2) |
63.0 (17.2) |
63.9 (17.7) |
61.8 (16.6) |
55.5 (13.1) |
48.2 (9.0) |
43.0 (6.1) |
42.6 (5.9) |
Record low °F (°C) | 25 (−4) |
34 (1) |
36 (2) |
39 (4) |
45 (7) |
50 (10) |
54 (12) |
54 (12) |
50 (10) |
43 (6) |
36 (2) |
32 (0) |
25 (−4) |
Average precipitation inches (mm) | 1.98 (50) |
2.20 (56) |
1.46 (37) |
0.65 (17) |
0.28 (7.1) |
0.05 (1.3) |
0.08 (2.0) |
0.01 (0.25) |
0.12 (3.0) |
0.50 (13) |
0.79 (20) |
1.67 (42) |
9.79 (249) |
Average precipitation days (≥ 0.01 in) | 6.5 | 7.1 | 6.2 | 3.8 | 2.2 | 0.7 | 0.7 | 0.3 | 0.9 | 2.4 | 3.7 | 5.8 | 40.3 |
Average relative humidity (%) | 63.1 | 65.7 | 67.3 | 67.0 | 70.6 | 74.0 | 74.6 | 74.1 | 72.7 | 69.4 | 66.3 | 63.7 | 69.0 |
Average dew point °F (°C) | 42.8 (6.0) |
45.3 (7.4) |
47.3 (8.5) |
49.5 (9.7) |
53.1 (11.7) |
57.0 (13.9) |
61.2 (16.2) |
62.4 (16.9) |
60.6 (15.9) |
55.6 (13.1) |
48.6 (9.2) |
43.2 (6.2) |
52.2 (11.2) |
Mean monthly sunshine hours | 239.3 | 227.4 | 261.0 | 276.2 | 250.5 | 242.4 | 304.7 | 295.0 | 253.3 | 243.4 | 230.1 | 231.3 | 3,054.6 |
Percent possible sunshine | 75 | 74 | 70 | 71 | 58 | 57 | 70 | 71 | 68 | 69 | 73 | 74 | 69 |
Source: NOAA (sun, relative humidity, and dew point 1961–1990) [2] [3] [4] |