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Climate data for Washington, D.C. (Reagan National Airport), 1991−2020 normals,[a] extremes 1872−present[b]
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 80 (27) |
84 (29) |
93 (34) |
95 (35) |
99 (37) |
104 (40) |
106 (41) |
106 (41) |
104 (40) |
98 (37) |
86 (30) |
79 (26) |
106 (41) |
| Mean maximum °F (°C) | 66.7 (19.3) |
68.1 (20.1) |
77.3 (25.2) |
86.4 (30.2) |
91.0 (32.8) |
95.7 (35.4) |
98.1 (36.7) |
96.5 (35.8) |
91.9 (33.3) |
84.5 (29.2) |
74.8 (23.8) |
67.1 (19.5) |
99.1 (37.3) |
| Mean daily maximum °F (°C) | 44.8 (7.1) |
48.3 (9.1) |
56.5 (13.6) |
68.0 (20.0) |
76.5 (24.7) |
85.1 (29.5) |
89.6 (32.0) |
87.8 (31.0) |
80.7 (27.1) |
69.4 (20.8) |
58.2 (14.6) |
48.8 (9.3) |
67.8 (19.9) |
| Daily mean °F (°C) | 37.5 (3.1) |
40.0 (4.4) |
47.6 (8.7) |
58.2 (14.6) |
67.2 (19.6) |
76.3 (24.6) |
81.0 (27.2) |
79.4 (26.3) |
72.4 (22.4) |
60.8 (16.0) |
49.9 (9.9) |
41.7 (5.4) |
59.3 (15.2) |
| Mean daily minimum °F (°C) | 30.1 (−1.1) |
31.8 (−0.1) |
38.6 (3.7) |
48.4 (9.1) |
58.0 (14.4) |
67.5 (19.7) |
72.4 (22.4) |
71.0 (21.7) |
64.1 (17.8) |
52.2 (11.2) |
41.6 (5.3) |
34.5 (1.4) |
50.9 (10.5) |
| Mean minimum °F (°C) | 14.3 (−9.8) |
16.9 (−8.4) |
23.4 (−4.8) |
34.9 (1.6) |
45.5 (7.5) |
55.7 (13.2) |
63.8 (17.7) |
62.1 (16.7) |
51.3 (10.7) |
38.7 (3.7) |
28.8 (−1.8) |
21.3 (−5.9) |
12.3 (−10.9) |
| Record low °F (°C) | −14 (−26) |
−15 (−26) |
4 (−16) |
15 (−9) |
33 (1) |
43 (6) |
52 (11) |
49 (9) |
36 (2) |
26 (−3) |
11 (−12) |
−13 (−25) |
−15 (−26) |
| Average precipitation inches (mm) | 2.86 (73) |
2.62 (67) |
3.50 (89) |
3.21 (82) |
3.94 (100) |
4.20 (107) |
4.33 (110) |
3.25 (83) |
3.93 (100) |
3.66 (93) |
2.91 (74) |
3.41 (87) |
41.82 (1,062) |
| Average snowfall inches (cm) | 4.9 (12) |
5.0 (13) |
2.0 (5.1) |
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) |
0.1 (0.25) |
1.7 (4.3) |
13.7 (35) |
| Average precipitation days (≥ 0.01 in) | 9.7 | 9.3 | 11.0 | 10.8 | 11.6 | 10.6 | 10.5 | 8.7 | 8.7 | 8.3 | 8.4 | 10.1 | 117.7 |
| Average snowy days (≥ 0.1 in) | 2.8 | 2.7 | 1.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 1.3 | 8.0 |
| Average relative humidity (%) | 62.1 | 60.5 | 58.6 | 58.0 | 64.5 | 65.8 | 66.9 | 69.3 | 69.7 | 67.4 | 64.7 | 64.1 | 64.3 |
| Average dew point °F (°C) | 21.7 (−5.7) |
23.5 (−4.7) |
31.3 (−0.4) |
39.7 (4.3) |
52.3 (11.3) |
61.5 (16.4) |
66.0 (18.9) |
65.8 (18.8) |
59.5 (15.3) |
47.5 (8.6) |
37.0 (2.8) |
27.1 (−2.7) |
44.4 (6.9) |
| Mean monthly sunshine hours | 144.6 | 151.8 | 204.0 | 228.2 | 260.5 | 283.2 | 280.5 | 263.1 | 225.0 | 203.6 | 150.2 | 133.0 | 2,527.7 |
| Percent possible sunshine | 48 | 50 | 55 | 57 | 59 | 64 | 62 | 62 | 60 | 59 | 50 | 45 | 57 |
| Average ultraviolet index | 2 | 3 | 5 | 7 | 8 | 9 | 9 | 8 | 7 | 4 | 3 | 2 | 6 |
| Source 1: NOAA (relative humidity, dew point and sun 1961−1990)[2][3][4][5] | |||||||||||||
| Source 2: Weather Atlas (UV)[6] | |||||||||||||
For reference, here are the 30-year climatology benchmarks for Reagan National Airport for April, along with our projections for the coming month:...Average snowfall: Trace; Forecast: 0 to trace
