Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Record high °F (°C) | 69 (21) |
76 (24) |
85 (29) |
93 (34) |
93 (34) |
99 (37) |
103 (39) |
102 (39) |
100 (38) |
91 (33) |
81 (27) |
71 (22) |
103 (39) |
Mean maximum °F (°C) | 57.7 (14.3) |
57.0 (13.9) |
68.0 (20.0) |
81.3 (27.4) |
88.0 (31.1) |
90.5 (32.5) |
92.8 (33.8) |
90.5 (32.5) |
87.6 (30.9) |
78.6 (25.9) |
69.1 (20.6) |
59.6 (15.3) |
94.3 (34.6) |
Mean daily maximum °F (°C) | 35.7 (2.1) |
38.8 (3.8) |
47.6 (8.7) |
61.1 (16.2) |
72.2 (22.3) |
79.9 (26.6) |
84.6 (29.2) |
82.4 (28.0) |
75.1 (23.9) |
63.1 (17.3) |
51.2 (10.7) |
40.3 (4.6) |
61.0 (16.1) |
Daily mean °F (°C) | 28.0 (−2.2) |
30.3 (−0.9) |
38.3 (3.5) |
50.2 (10.1) |
60.9 (16.1) |
69.0 (20.6) |
73.7 (23.2) |
71.8 (22.1) |
64.6 (18.1) |
53.2 (11.8) |
42.7 (5.9) |
33.3 (0.7) |
51.3 (10.7) |
Mean daily minimum °F (°C) | 20.3 (−6.5) |
21.9 (−5.6) |
28.9 (−1.7) |
39.3 (4.1) |
49.6 (9.8) |
58.1 (14.5) |
62.7 (17.1) |
61.1 (16.2) |
54.0 (12.2) |
43.3 (6.3) |
34.3 (1.3) |
26.3 (−3.2) |
41.7 (5.4) |
Mean minimum °F (°C) | 0.6 (−17.4) |
3.6 (−15.8) |
11.0 (−11.7) |
24.7 (−4.1) |
34.7 (1.5) |
44.1 (6.7) |
50.9 (10.5) |
48.8 (9.3) |
38.7 (3.7) |
28.7 (−1.8) |
18.0 (−7.8) |
9.1 (−12.7) |
−1.6 (−18.7) |
Record low °F (°C) | −21 (−29) |
−19 (−28) |
−4 (−20) |
8 (−13) |
27 (−3) |
34 (1) |
43 (6) |
38 (3) |
29 (−2) |
19 (−7) |
5 (−15) |
−13 (−25) |
−21 (−29) |
Average precipitation inches (mm) | 2.59 (66) |
2.07 (53) |
2.77 (70) |
3.26 (83) |
3.26 (83) |
3.80 (97) |
3.61 (92) |
3.85 (98) |
4.15 (105) |
3.71 (94) |
2.85 (72) |
2.80 (71) |
38.72 (983) |
Average snowfall inches (cm) | 11.7 (30) |
10.9 (28) |
10.1 (26) |
0.8 (2.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.7 (1.8) |
3.2 (8.1) |
7.7 (20) |
45.1 (115) |
Average precipitation days (≥ 0.01 in) | 12.6 | 11.4 | 11.8 | 12.2 | 12.9 | 12.9 | 11.1 | 11.1 | 10.0 | 10.7 | 10.3 | 12.1 | 139.1 |
Average snowy days (≥ 0.1 in) | 8.7 | 8.4 | 4.8 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.3 | 1.7 | 6.3 | 31.2 |
Average relative humidity (%) | 70.1 | 67.5 | 63.3 | 60.4 | 64.6 | 70.5 | 71.1 | 73.8 | 75.2 | 71.6 | 71.8 | 72.5 | 69.4 |
Average dew point °F (°C) | 16.2 (−8.8) |
17.2 (−8.2) |
24.4 (−4.2) |
33.1 (0.6) |
45.3 (7.4) |
55.9 (13.3) |
60.4 (15.8) |
59.9 (15.5) |
53.4 (11.9) |
41.4 (5.2) |
32.2 (0.1) |
22.3 (−5.4) |
38.5 (3.6) |
Mean monthly sunshine hours | 130.3 | 143.7 | 185.7 | 210.5 | 246.9 | 269.7 | 285.7 | 257.2 | 200.2 | 173.3 | 104.3 | 95.9 | 2,303.4 |
Percent possible sunshine | 44 | 48 | 50 | 53 | 55 | 60 | 62 | 60 | 54 | 50 | 35 | 33 | 52 |
Source: NOAA (relative humidity and dew point 1964–1990, sun 1961–1990) [2] [3] [4] |
Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Record high °F (°C) | 69 (21) |
76 (24) |
85 (29) |
93 (34) |
93 (34) |
99 (37) |
103 (39) |
102 (39) |
100 (38) |
91 (33) |
81 (27) |
71 (22) |
103 (39) |
Mean maximum °F (°C) | 57.7 (14.3) |
57.0 (13.9) |
68.0 (20.0) |
81.3 (27.4) |
88.0 (31.1) |
90.5 (32.5) |
92.8 (33.8) |
90.5 (32.5) |
87.6 (30.9) |
78.6 (25.9) |
69.1 (20.6) |
59.6 (15.3) |
94.3 (34.6) |
Mean daily maximum °F (°C) | 35.7 (2.1) |
38.8 (3.8) |
47.6 (8.7) |
61.1 (16.2) |
72.2 (22.3) |
79.9 (26.6) |
84.6 (29.2) |
82.4 (28.0) |
75.1 (23.9) |
63.1 (17.3) |
51.2 (10.7) |
40.3 (4.6) |
61.0 (16.1) |
Daily mean °F (°C) | 28.0 (−2.2) |
30.3 (−0.9) |
38.3 (3.5) |
50.2 (10.1) |
60.9 (16.1) |
69.0 (20.6) |
73.7 (23.2) |
71.8 (22.1) |
64.6 (18.1) |
53.2 (11.8) |
42.7 (5.9) |
33.3 (0.7) |
51.3 (10.7) |
Mean daily minimum °F (°C) | 20.3 (−6.5) |
21.9 (−5.6) |
28.9 (−1.7) |
39.3 (4.1) |
49.6 (9.8) |
58.1 (14.5) |
62.7 (17.1) |
61.1 (16.2) |
54.0 (12.2) |
43.3 (6.3) |
34.3 (1.3) |
26.3 (−3.2) |
41.7 (5.4) |
Mean minimum °F (°C) | 0.6 (−17.4) |
3.6 (−15.8) |
11.0 (−11.7) |
24.7 (−4.1) |
34.7 (1.5) |
44.1 (6.7) |
50.9 (10.5) |
48.8 (9.3) |
38.7 (3.7) |
28.7 (−1.8) |
18.0 (−7.8) |
9.1 (−12.7) |
−1.6 (−18.7) |
Record low °F (°C) | −21 (−29) |
−19 (−28) |
−4 (−20) |
8 (−13) |
27 (−3) |
34 (1) |
43 (6) |
38 (3) |
29 (−2) |
19 (−7) |
5 (−15) |
−13 (−25) |
−21 (−29) |
Average precipitation inches (mm) | 2.59 (66) |
2.07 (53) |
2.77 (70) |
3.26 (83) |
3.26 (83) |
3.80 (97) |
3.61 (92) |
3.85 (98) |
4.15 (105) |
3.71 (94) |
2.85 (72) |
2.80 (71) |
38.72 (983) |
Average snowfall inches (cm) | 11.7 (30) |
10.9 (28) |
10.1 (26) |
0.8 (2.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.7 (1.8) |
3.2 (8.1) |
7.7 (20) |
45.1 (115) |
Average precipitation days (≥ 0.01 in) | 12.6 | 11.4 | 11.8 | 12.2 | 12.9 | 12.9 | 11.1 | 11.1 | 10.0 | 10.7 | 10.3 | 12.1 | 139.1 |
Average snowy days (≥ 0.1 in) | 8.7 | 8.4 | 4.8 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.3 | 1.7 | 6.3 | 31.2 |
Average relative humidity (%) | 70.1 | 67.5 | 63.3 | 60.4 | 64.6 | 70.5 | 71.1 | 73.8 | 75.2 | 71.6 | 71.8 | 72.5 | 69.4 |
Average dew point °F (°C) | 16.2 (−8.8) |
17.2 (−8.2) |
24.4 (−4.2) |
33.1 (0.6) |
45.3 (7.4) |
55.9 (13.3) |
60.4 (15.8) |
59.9 (15.5) |
53.4 (11.9) |
41.4 (5.2) |
32.2 (0.1) |
22.3 (−5.4) |
38.5 (3.6) |
Mean monthly sunshine hours | 130.3 | 143.7 | 185.7 | 210.5 | 246.9 | 269.7 | 285.7 | 257.2 | 200.2 | 173.3 | 104.3 | 95.9 | 2,303.4 |
Percent possible sunshine | 44 | 48 | 50 | 53 | 55 | 60 | 62 | 60 | 54 | 50 | 35 | 33 | 52 |
Source: NOAA (relative humidity and dew point 1964–1990, sun 1961–1990) [2] [3] [4] |