Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Record high °F (°C) | 76 (24) |
80 (27) |
84 (29) |
90 (32) |
95 (35) |
105 (41) |
105 (41) |
105 (41) |
101 (38) |
90 (32) |
81 (27) |
79 (26) |
105 (41) |
Mean maximum °F (°C) | 65.0 (18.3) |
67.1 (19.5) |
74.7 (23.7) |
80.8 (27.1) |
88.3 (31.3) |
96.5 (35.8) |
99.6 (37.6) |
96.9 (36.1) |
92.9 (33.8) |
84.1 (28.9) |
73.6 (23.1) |
65.3 (18.5) |
100.6 (38.1) |
Mean daily maximum °F (°C) | 44.6 (7.0) |
45.7 (7.6) |
55.7 (13.2) |
61.7 (16.5) |
71.2 (21.8) |
83.4 (28.6) |
89.9 (32.2) |
87.5 (30.8) |
79.6 (26.4) |
65.3 (18.5) |
52.9 (11.6) |
44.0 (6.7) |
65.1 (18.4) |
Daily mean °F (°C) | 31.7 (−0.2) |
32.7 (0.4) |
41.6 (5.3) |
47.8 (8.8) |
57.4 (14.1) |
68.2 (20.1) |
75.1 (23.9) |
72.9 (22.7) |
64.8 (18.2) |
51.1 (10.6) |
39.4 (4.1) |
31.2 (−0.4) |
51.2 (10.6) |
Mean daily minimum °F (°C) | 18.7 (−7.4) |
19.7 (−6.8) |
27.5 (−2.5) |
33.9 (1.1) |
43.6 (6.4) |
53.0 (11.7) |
60.2 (15.7) |
58.3 (14.6) |
50.0 (10.0) |
37.0 (2.8) |
26.0 (−3.3) |
18.4 (−7.6) |
37.2 (2.9) |
Mean minimum °F (°C) | −3.8 (−19.9) |
−1.5 (−18.6) |
9.5 (−12.5) |
19.8 (−6.8) |
30.2 (−1.0) |
41.9 (5.5) |
51.4 (10.8) |
48.8 (9.3) |
35.9 (2.2) |
19.6 (−6.9) |
5.4 (−14.8) |
−3.4 (−19.7) |
−11 (−24) |
Record low °F (°C) | −29 (−34) |
−25 (−32) |
−11 (−24) |
−2 (−19) |
19 (−7) |
30 (−1) |
42 (6) |
40 (4) |
17 (−8) |
−2 (−19) |
−18 (−28) |
−25 (−32) |
−29 (−34) |
Average precipitation inches (mm) | 0.38 (9.7) |
0.41 (10) |
0.86 (22) |
1.68 (43) |
2.16 (55) |
1.94 (49) |
2.14 (54) |
1.58 (40) |
1.35 (34) |
0.99 (25) |
0.64 (16) |
0.35 (8.9) |
14.48 (368) |
Average snowfall inches (cm) | 6.4 (16) |
7.6 (19) |
8.8 (22) |
6.2 (16) |
1.4 (3.6) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.8 (2.0) |
3.9 (9.9) |
7.3 (19) |
6.6 (17) |
49.0 (124) |
Average precipitation days (≥ 0.01 in) | 4.4 | 5.5 | 6.2 | 9.0 | 10.4 | 8.1 | 8.3 | 7.5 | 6.0 | 5.3 | 4.6 | 4.4 | 79.7 |
Average snowy days (≥ 0.1 in) | 5.0 | 5.3 | 4.8 | 4.1 | 0.8 | 0.0 | 0.0 | 0.0 | 0.4 | 1.8 | 4.6 | 4.6 | 31.4 |
Average relative humidity (%) | 55.2 | 55.8 | 53.7 | 49.6 | 51.7 | 49.3 | 47.8 | 49.3 | 50.1 | 49.2 | 56.3 | 56.6 | 52.0 |
Average dew point °F (°C) | 12.7 (−10.7) |
16.2 (−8.8) |
19.9 (−6.7) |
26.2 (−3.2) |
35.8 (2.1) |
43.5 (6.4) |
48.4 (9.1) |
47.7 (8.7) |
39.6 (4.2) |
28.6 (−1.9) |
21.0 (−6.1) |
14.2 (−9.9) |
29.5 (−1.4) |
Mean monthly sunshine hours | 215.3 | 211.1 | 255.6 | 276.2 | 290.0 | 315.3 | 325.0 | 306.4 | 272.3 | 249.2 | 194.3 | 195.9 | 3,106.6 |
Mean daily daylight hours | 9.7 | 10.7 | 12 | 13.3 | 14.4 | 15 | 14.7 | 13.7 | 12.4 | 11.1 | 10 | 9.4 | 12.2 |
Percent possible sunshine | 72 | 70 | 69 | 69 | 65 | 70 | 71 | 72 | 73 | 72 | 65 | 67 | 70 |
Average ultraviolet index | 2 | 2 | 3 | 3 | 5 | 6 | 6 | 5 | 5 | 3 | 2 | 2 | 4 |
Source 1: NOAA (sun, relative humidity and dew point 1961−1990) [1] [2] [3] [4] [5] | |||||||||||||
Source 2: Weather Atlas (Daylight-Average UV index) [6] |
Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Record high °F (°C) | 76 (24) |
80 (27) |
84 (29) |
90 (32) |
95 (35) |
105 (41) |
105 (41) |
105 (41) |
101 (38) |
90 (32) |
81 (27) |
79 (26) |
105 (41) |
Mean maximum °F (°C) | 65.0 (18.3) |
67.1 (19.5) |
74.7 (23.7) |
80.8 (27.1) |
88.3 (31.3) |
96.5 (35.8) |
99.6 (37.6) |
96.9 (36.1) |
92.9 (33.8) |
84.1 (28.9) |
73.6 (23.1) |
65.3 (18.5) |
100.6 (38.1) |
Mean daily maximum °F (°C) | 44.6 (7.0) |
45.7 (7.6) |
55.7 (13.2) |
61.7 (16.5) |
71.2 (21.8) |
83.4 (28.6) |
89.9 (32.2) |
87.5 (30.8) |
79.6 (26.4) |
65.3 (18.5) |
52.9 (11.6) |
44.0 (6.7) |
65.1 (18.4) |
Daily mean °F (°C) | 31.7 (−0.2) |
32.7 (0.4) |
41.6 (5.3) |
47.8 (8.8) |
57.4 (14.1) |
68.2 (20.1) |
75.1 (23.9) |
72.9 (22.7) |
64.8 (18.2) |
51.1 (10.6) |
39.4 (4.1) |
31.2 (−0.4) |
51.2 (10.6) |
Mean daily minimum °F (°C) | 18.7 (−7.4) |
19.7 (−6.8) |
27.5 (−2.5) |
33.9 (1.1) |
43.6 (6.4) |
53.0 (11.7) |
60.2 (15.7) |
58.3 (14.6) |
50.0 (10.0) |
37.0 (2.8) |
26.0 (−3.3) |
18.4 (−7.6) |
37.2 (2.9) |
Mean minimum °F (°C) | −3.8 (−19.9) |
−1.5 (−18.6) |
9.5 (−12.5) |
19.8 (−6.8) |
30.2 (−1.0) |
41.9 (5.5) |
51.4 (10.8) |
48.8 (9.3) |
35.9 (2.2) |
19.6 (−6.9) |
5.4 (−14.8) |
−3.4 (−19.7) |
−11 (−24) |
Record low °F (°C) | −29 (−34) |
−25 (−32) |
−11 (−24) |
−2 (−19) |
19 (−7) |
30 (−1) |
42 (6) |
40 (4) |
17 (−8) |
−2 (−19) |
−18 (−28) |
−25 (−32) |
−29 (−34) |
Average precipitation inches (mm) | 0.38 (9.7) |
0.41 (10) |
0.86 (22) |
1.68 (43) |
2.16 (55) |
1.94 (49) |
2.14 (54) |
1.58 (40) |
1.35 (34) |
0.99 (25) |
0.64 (16) |
0.35 (8.9) |
14.48 (368) |
Average snowfall inches (cm) | 6.4 (16) |
7.6 (19) |
8.8 (22) |
6.2 (16) |
1.4 (3.6) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.8 (2.0) |
3.9 (9.9) |
7.3 (19) |
6.6 (17) |
49.0 (124) |
Average precipitation days (≥ 0.01 in) | 4.4 | 5.5 | 6.2 | 9.0 | 10.4 | 8.1 | 8.3 | 7.5 | 6.0 | 5.3 | 4.6 | 4.4 | 79.7 |
Average snowy days (≥ 0.1 in) | 5.0 | 5.3 | 4.8 | 4.1 | 0.8 | 0.0 | 0.0 | 0.0 | 0.4 | 1.8 | 4.6 | 4.6 | 31.4 |
Average relative humidity (%) | 55.2 | 55.8 | 53.7 | 49.6 | 51.7 | 49.3 | 47.8 | 49.3 | 50.1 | 49.2 | 56.3 | 56.6 | 52.0 |
Average dew point °F (°C) | 12.7 (−10.7) |
16.2 (−8.8) |
19.9 (−6.7) |
26.2 (−3.2) |
35.8 (2.1) |
43.5 (6.4) |
48.4 (9.1) |
47.7 (8.7) |
39.6 (4.2) |
28.6 (−1.9) |
21.0 (−6.1) |
14.2 (−9.9) |
29.5 (−1.4) |
Mean monthly sunshine hours | 215.3 | 211.1 | 255.6 | 276.2 | 290.0 | 315.3 | 325.0 | 306.4 | 272.3 | 249.2 | 194.3 | 195.9 | 3,106.6 |
Mean daily daylight hours | 9.7 | 10.7 | 12 | 13.3 | 14.4 | 15 | 14.7 | 13.7 | 12.4 | 11.1 | 10 | 9.4 | 12.2 |
Percent possible sunshine | 72 | 70 | 69 | 69 | 65 | 70 | 71 | 72 | 73 | 72 | 65 | 67 | 70 |
Average ultraviolet index | 2 | 2 | 3 | 3 | 5 | 6 | 6 | 5 | 5 | 3 | 2 | 2 | 4 |
Source 1: NOAA (sun, relative humidity and dew point 1961−1990) [1] [2] [3] [4] [5] | |||||||||||||
Source 2: Weather Atlas (Daylight-Average UV index) [6] |