What are the odds it'll rain on any given day?

This chart will show how many times it has rained on any given day over the past 113 years (Jan. 1, 1893 - Dec. 31, 2005) Combination of Seattle-Tacoma Airport and Federal Building
Day	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sept	Oct	Nov	Dec
1	70	63	59	55	51	34	27	9	31	37	52	77
2	64	63	65	58	48	32	29	13	26	43	60	67
3	70	66	63	54	43	31	30	14	28	36	65	68
4	74	65	53	56	43	34	32	9	28	38	65	69
5	66	58	60	59	44	36	26	16	34	37	62	76
6	64	62	43	57	41	40	25	19	26	41	63	64
7	67	62	55	57	34	36	25	14	29	50	71	67
8	74	55	64	41	45	36	21	10	30	41	61	66
9	72	65	64	49	49	41	18	11	24	50	74	72
10	65	65	57	49	43	37	24	12	32	53	71	71
11	65	59	65	58	47	42	24	12	26	43	67	73
12	70	59	66	55	33	40	15	13	26	44	69	64
13	77	65	61	54	41	45	19	19	32	50	70	63
14	70	71	55	50	40	36	19	19	39	50	62	69
15	68	70	59	55	39	26	18	25	26	44	78	69
16	73	74	61	53	49	39	23	22	33	48	71	66
17	71	69	61	49	47	32	14	23	33	47	68	62
18	68	53	55	57	42	35	12	25	35	42	59	62
19	53	60	62	58	43	33	14	17	35	50	84	70
20	68	66	61	44	33	36	10	14	36	50	62	64
21	65	58	62	44	38	29	10	17	26	46	60	73
22	65	64	62	49	35	33	10	24	31	51	59	65
23	71	63	67	45	32	31	12	22	28	46	73	68
24	73	63	59	44	40	34	11	22	30	53	73	66
25	65	59	57	42	47	25	15	27	34	51	67	64
26	61	54	52	39	47	30	16	24	39	51	57	60
27	60	65	58	46	46	36	11	26	32	54	62	70
28	67	63	62	49	43	33	11	24	33	56	59	71
29	64		63	50	38	31	10	27	36	59	75	76
30	64		56	38	39	30	9	24	41	60	75	62
31	62		55		38		11	31		61		64

Blue numbers -- wettest days of month
Red numbers -- driest days of the month
Green number -- wettest day of the year
Orange number -- driest day of the year.

Information supplied by the National Weather Service Seattle

What are the odds it'll rain in Seattle/Tacoma on any given day?

What are the odds it'll rain on any given day?