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

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Story Published: Oct 4, 2006 at 1:39 PM PST

Story Updated: Apr 2, 2009 at 1:45 PM PST

By Scott Sistek

This chart will show how many times it has rained on any given day over the past 116 years (Jan. 1, 1893 - Dec. 31, 2008) Combination of Seattle-Tacoma Airport and Federal Building
Day	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sept	Oct	Nov	Dec
1	72	64	60	56	52	35	27	10	31	38	54	80
2	67	64	67	58	49	34	29	13	26	45	62	69
3	75	69	65	55	45	33	31	15	29	38	67	69
4	77	67	53	57	44	37	33	9	29	40	68	70
5	69	59	62	60	44	38	26	16	34	38	63	76
6	67	64	45	58	42	42	25	19	26	44	65	65
7	70	64	58	59	34	36	25	14	29	52	74	68
8	76	58	66	44	46	37	21	10	30	42	64	66
9	75	67	66	50	49	44	18	13	25	51	77	74
10	68	67	60	50	44	38	24	12	32	54	74	74
11	67	61	67	58	48	42	24	12	26	43	70	74
12	72	59	67	56	34	41	16	13	26	45	72	66
13	78	67	64	57	42	47	21	19	33	51	72	66
14	72	72	57	53	40	37	19	19	40	51	64	72
15	68	72	62	57	39	27	18	25	27	47	80	71
16	75	75	63	55	49	40	23	22	35	51	72	67
17	73	70	64	51	47	33	15	23	34	49	69	64
18	70	53	57	58	43	35	13	27	36	44	61	64
19	56	61	64	59	46	33	15	19	36	52	86	72
20	70	67	63	46	35	36	11	16	38	52	65	67
21	66	59	63	47	41	29	11	19	29	47	62	75
22	65	65	64	50	36	33	11	24	32	51	60	67
23	72	65	70	46	34	31	13	22	28	47	74	70
24	73	64	62	45	42	35	11	23	31	55	73	68
25	67	60	58	42	49	25	15	29	36	51	68	67
26	63	56	55	39	48	30	16	25	39	51	59	62
27	61	68	59	47	48	36	11	27	33	54	64	73
28	69	66	64	50	44	34	11	24	34	56	61	73
29	66		64	52	38	32	11	28	37	61	77	78
30	66		57	40	39	30	9	24	42	60	77	63
31	62		58		39		12	31		62		65

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

And here is the same chart, given as a percent chance instead of numerical counter for each year:

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sept	Oct	Nov	Dec
1	62.1	55.2	51.7	48.3	44.8	30.2	23.3	8.6	26.7	32.8	46.5	69.0
2	57.8	55.2	57.8	50.0	42.2	29.3	25.0	11.2	22.4	38.8	53.4	59.5
3	64.7	59.5	56.0	47.4	38.8	28.4	26.7	12.9	25.0	32.8	57.8	59.5
4	66.4	57.8	45.7	49.1	37.9	31.9	28.4	7.8	25.0	34.5	58.6	60.3
5	59.5	50.9	53.4	51.7	37.9	32.8	22.4	13.8	29.3	32.8	54.3	65.5
6	57.8	55.2	38.8	50.0	36.2	36.2	21.6	16.4	22.4	37.9	56.0	56.0
7	60.3	55.2	50.0	50.9	29.3	31.0	21.6	12.1	25.0	44.8	63.8	58.6
8	65.5	50.0	56.9	37.9	39.7	31.9	18.1	8.6	25.9	36.2	55.2	56.9
9	64.7	57.8	56.9	43.1	42.2	37.9	15.5	11.2	21.6	44.0	66.4	63.8
10	58.6	57.8	51.7	43.1	37.9	32.8	20.7	10.3	27.6	46.5	63.8	63.8
11	57.8	52.6	57.8	50.0	41.4	36.2	20.7	10.3	22.4	37.1	60.3	63.8
12	62.1	50.9	57.8	48.3	29.3	35.3	13.8	11.2	22.4	38.8	62.1	56.9
13	67.2	57.8	55.2	49.1	36.2	40.5	18.1	16.4	28.4	44.0	62.1	56.9
14	62.1	62.1	49.1	45.7	34.5	31.9	16.4	16.4	34.5	44.0	55.2	62.1
15	58.6	62.1	53.4	49.1	33.6	23.3	15.5	21.6	23.3	40.5	69.0	61.2
16	64.7	64.7	54.3	47.4	42.2	34.5	19.8	19.0	30.2	44.0	62.1	57.8
17	62.9	60.3	55.2	44.0	40.5	28.4	12.9	19.8	29.3	42.2	59.5	55.2
18	60.3	45.7	49.1	50.0	37.1	30.2	11.2	23.3	31.0	37.9	52.6	55.2
19	48.3	52.6	55.2	50.9	39.7	28.4	12.9	16.4	31.0	44.8	74.1	62.1
20	60.3	57.8	54.3	39.7	30.2	31.0	9.5	13.8	32.8	44.8	56.0	57.8
21	56.9	50.9	54.3	40.5	35.3	25.0	9.5	16.4	25.0	40.5	53.4	64.7
22	56.0	56.0	55.2	43.1	31.0	28.4	9.5	20.7	27.6	44.0	51.7	57.8
23	62.1	56.0	60.3	39.7	29.3	26.7	11.2	19.0	24.1	40.5	63.8	60.3
24	62.9	55.2	53.4	38.8	36.2	30.2	9.5	19.8	26.7	47.4	62.9	58.6
25	57.8	51.7	50.0	36.2	42.2	21.6	12.9	25.0	31.0	44.0	58.6	57.8
26	54.3	48.3	47.4	33.6	41.4	25.9	13.8	21.6	33.6	44.0	50.9	53.4
27	52.6	58.6	50.9	40.5	41.4	31.0	9.5	23.3	28.4	46.5	55.2	62.9
28	59.5	56.9	55.2	43.1	37.9	29.3	9.5	20.7	29.3	48.3	52.6	62.9
29	56.9		55.2	44.8	32.8	27.6	9.5	24.1	31.9	52.6	66.4	67.2
30	56.9		49.1	34.5	33.6	25.9	7.8	20.7	36.2	51.7	66.4	54.3
31	53.4		50.0		33.6		10.3	26.7		53.4		56.0

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

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By Scott Sistek

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