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Pound Sterling vs Swiss Franc (GBPCHF) Seasonality

Over 1990 to 2025 (36 years of data), GBPCHF has tended to move short between 24.08 and 03.10, closing higher in 66.7% of those years for an average +0.71% move and an annualized Sharpe of 0.47.

Average seasonal curve

GBPCHF average seasonal curve, 1990 to 2025
Index	Value
1	100
2	99.8074
3	99.6695
4	99.7618
5	100.3709
6	100.3512
7	100.4176
8	100.3477
9	100.2409
10	100.153
11	100.1205
12	99.827
13	99.7807
14	99.9619
15	98.1367
16	98.2119
17	98.587
18	98.472
19	98.5066
20	98.4838
21	98.328
22	98.4198
23	98.2268
24	98.1063
25	98.014
26	98.5258
27	98.7008
28	98.8082
29	98.9869
30	98.9549
31	99.2153
32	99.0603
33	98.9221
34	98.8282
35	99.0537
36	99.2252
37	99.1456
38	99.3622
39	99.3033
40	99.2465
41	99.0766
42	99.034
43	99.3694
44	99.4301
45	99.3917
46	99.3635
47	99.1042
48	99.1687
49	99.2682
50	99.1547
51	98.9259
52	98.8976

Strongest recurring windows

Window	Dir	Win rate	Avg return	Sharpe	Years
24.08 → 03.10	Short	66.7%	+0.71%	0.47	36
27.08 → 16.09	Short	66.7%	+0.17%	0.25	36
26.08 → 16.09	Short	66.7%	+0.07%	0.09	36
23.08 → 03.09	Short	65.7%	+0.39%	1.32	35
24.08 → 06.10	Short	63.9%	+0.86%	0.54	36
24.08 → 05.10	Short	63.9%	+0.72%	0.45	36
23.08 → 03.10	Short	63.9%

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