Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Record high °F (°C) | 84 (29) |
82 (28) |
92 (33) |
97 (36) |
100 (38) |
102 (39) |
105 (41) |
105 (41) |
100 (38) |
95 (35) |
86 (30) |
82 (28) |
105 (41) |
Mean maximum °F (°C) | 72.4 (22.4) |
74.3 (23.5) |
80.7 (27.1) |
86.9 (30.5) |
91.5 (33.1) |
95.7 (35.4) |
98.4 (36.9) |
95.3 (35.2) |
92.0 (33.3) |
86.0 (30.0) |
78.9 (26.1) |
73.4 (23.0) |
99.3 (37.4) |
Mean daily maximum °F (°C) | 50.7 (10.4) |
53.4 (11.9) |
60.1 (15.6) |
70.0 (21.1) |
77.4 (25.2) |
85.2 (29.6) |
89.4 (31.9) |
86.9 (30.5) |
81.4 (27.4) |
72.3 (22.4) |
62.1 (16.7) |
54.7 (12.6) |
70.3 (21.3) |
Daily mean °F (°C) | 42.2 (5.7) |
44.2 (6.8) |
50.7 (10.4) |
60.1 (15.6) |
68.3 (20.2) |
76.7 (24.8) |
81.1 (27.3) |
79.2 (26.2) |
74.0 (23.3) |
63.7 (17.6) |
53.3 (11.8) |
46.1 (7.8) |
61.6 (16.4) |
Mean daily minimum °F (°C) | 33.6 (0.9) |
35.1 (1.7) |
41.3 (5.2) |
50.1 (10.1) |
59.1 (15.1) |
68.1 (20.1) |
72.8 (22.7) |
71.6 (22.0) |
66.6 (19.2) |
55.1 (12.8) |
44.4 (6.9) |
37.6 (3.1) |
52.9 (11.6) |
Mean minimum °F (°C) | 18.7 (−7.4) |
21.6 (−5.8) |
27.4 (−2.6) |
37.0 (2.8) |
46.9 (8.3) |
56.0 (13.3) |
64.7 (18.2) |
63.7 (17.6) |
55.5 (13.1) |
40.4 (4.7) |
29.8 (−1.2) |
23.9 (−4.5) |
16.8 (−8.4) |
Record low °F (°C) | −3 (−19) |
2 (−17) |
14 (−10) |
23 (−5) |
36 (2) |
45 (7) |
54 (12) |
49 (9) |
40 (4) |
27 (−3) |
17 (−8) |
5 (−15) |
−3 (−19) |
Average precipitation inches (mm) | 3.41 (87) |
2.90 (74) |
3.69 (94) |
3.37 (86) |
3.78 (96) |
4.43 (113) |
6.08 (154) |
5.88 (149) |
5.40 (137) |
3.86 (98) |
3.10 (79) |
3.28 (83) |
49.18 (1,249) |
Average snowfall inches (cm) | 3.2 (8.1) |
1.5 (3.8) |
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) |
0.0 (0.0) |
0.0 (0.0) |
1.1 (2.8) |
6.2 (16) |
Average precipitation days (≥ 0.01 in) | 10.7 | 9.2 | 10.9 | 10.0 | 11.2 | 9.7 | 10.6 | 10.2 | 9.4 | 7.7 | 8.9 | 9.9 | 118.4 |
Average snowy days (≥ 0.1 in) | 1.7 | 1.3 | 0.5 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.5 | 4.0 |
Average relative humidity (%) | 66.3 | 65.6 | 64.6 | 62.8 | 68.8 | 70.6 | 73.3 | 75.2 | 74.4 | 72.1 | 68.5 | 67.0 | 69.1 |
Average dew point °F (°C) | 27.9 (−2.3) |
28.9 (−1.7) |
35.8 (2.1) |
43.2 (6.2) |
54.5 (12.5) |
63.1 (17.3) |
68.2 (20.1) |
68.0 (20.0) |
62.4 (16.9) |
51.3 (10.7) |
41.7 (5.4) |
32.7 (0.4) |
48.1 (9.0) |
Mean monthly sunshine hours | 171.5 | 175.2 | 229.3 | 252.8 | 271.7 | 280.1 | 278.3 | 260.4 | 231.4 | 208.3 | 175.7 | 160.4 | 2,695.1 |
Percent possible sunshine | 56 | 58 | 62 | 64 | 62 | 64 | 62 | 62 | 62 | 60 | 57 | 53 | 61 |
Average ultraviolet index | 2 | 4 | 5 | 7 | 8 | 10 | 9 | 9 | 7 | 5 | 3 | 2 | 6 |
Source 1: NOAA (relative humidity and sun 1961–1990) [1] [2] [3] | |||||||||||||
Source 2: Weather Atlas (UV) [4] |