Washington DC shows a moderate seasonal swing: sample heat runs higher around Sep–Nov, softer around Jul–Aug, Dec (monthly sample means about 1.2–1.8). Long weekends, conventions and school breaks often beat a simple “season.” Index ≈ each hotel’s off-peak baseline—not a live city-wide rate.
January
2 public holidaysFebruary
1 public holidays11.6
21.5
31.3
41.5
51.4
6
71.6
81.7
91.4
101.3
111.4
121.9
131.4
141.4
161.3
171.3
181.6
191.5
201.4
211.5
222.0
231.6
241.5
251.4
261.4
27
281.5
March
No public holidays this month12.3
22.2
31.9
41.8
51.5
61.3
71.5
82.2
92.0
102.2
111.9
121.6
131.5
141.5
152.3
162.6
171.9
181.9
191.6
201.5
211.5
222.0
232.2
241.7
251.7
261.6
271.6
281.3
291.7
301.8
311.9
April
No public holidays this month12.0
21.7
31.6
41.6
52.2
62.4
72.4
82.0
91.8
101.7
112.0
122.9
133.2
143.3
153.0
162.2
172.2
181.7
192.4
202.3
212.1
222.0
231.6
241.6
252.0
262.2
272.7
282.8
292.2
302.5
May
1 public holidays13.2
21.6
32.2
42.1
52.7
61.6
71.9
81.6
91.5
102.1
112.4
123.0
132.1
142.5
152.1
162.0
172.5
182.4
192.6
201.8
212.1
221.7
231.7
242.1
252.1
262.0
271.4
281.9
291.6
301.5
June
1 public holidays11.8
22.0
31.8
42.0
51.8
62.2
72.1
82.2
92.1
101.7
112.5
121.7
132.0
142.3
152.2
162.0
171.9
192.7
202.3
212.2
222.2
232.0
241.8
252.6
261.5
272.1
282.0
292.1
301.9
July
1 public holidays11.7
22.7
31.8
41.9
61.8
71.9
81.6
92.3
10
112.5
121.9
13
14
151.3
162.1
17
184.5
19
20
21
22
234.4
24
254.5
26
27
28
29
30
31
August
No public holidays this month1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
September
1 public holidaysOctober
1 public holidaysNovember
2 public holidaysDecember
1 public holidaysIndex ≈ 1.0 is each hotel’s sample off-peak baseline; shown when >1.2. Sampled reference, not live city-wide rates