Seattle
Climate

Seattle

Section Title: Climate
Table Section Text: None

Climate data for Seattle (SeaTac Airport), 1981–2010 normals, extremes 1894–present

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year

Record high °F (°C)	67 (19)	70 (21)	79 (26)	89 (32)	93 (34)	98 (37)	103 (39)	99 (37)	98 (37)	89 (32)	74 (23)	66 (19)	103 (39)

Mean maximum °F (°C)	56.4 (13.6)	60.3 (15.7)	66.0 (18.9)	74.7 (23.7)	81.5 (27.5)	85.5 (29.7)	90.6 (32.6)	88.8 (31.6)	84.6 (29.2)	72.2 (22.3)	60.7 (15.9)	55.9 (13.3)	93.8 (34.3)

Average high °F (°C)	47.2 (8.4)	49.9 (9.9)	53.7 (12.1)	58.5 (14.7)	64.7 (18.2)	69.9 (21.1)	75.8 (24.3)	76.3 (24.6)	70.5 (21.4)	59.7 (15.4)	50.9 (10.5)	45.7 (7.6)	60.3 (15.7)

Average low °F (°C)	36.9 (2.7)	36.9 (2.7)	39.3 (4.1)	42.2 (5.7)	47.3 (8.5)	51.9 (11.1)	55.6 (13.1)	55.9 (13.3)	52.1 (11.2)	45.8 (7.7)	40.0 (4.4)	35.6 (2.0)	45.0 (7.2)

Mean minimum °F (°C)	25.4 (−3.7)	25.9 (−3.4)	31.3 (−0.4)	35.0 (1.7)	39.7 (4.3)	46.2 (7.9)	50.6 (10.3)	50.7 (10.4)	44.6 (7.0)	35.7 (2.1)	28.7 (−1.8)	24.0 (−4.4)	19.5 (−6.9)

Record low °F (°C)	0 (−18)	1 (−17)	11 (−12)	29 (−2)	28 (−2)	38 (3)	43 (6)	44 (7)	35 (2)	28 (−2)	6 (−14)	6 (−14)	0 (−18)

Average precipitation inches (mm)	5.57 (141)	3.50 (89)	3.72 (94)	2.71 (69)	1.94 (49)	1.57 (40)	0.70 (18)	0.88 (22)	1.50 (38)	3.48 (88)	6.57 (167)	5.35 (136)	37.49 (952)

Average snowfall inches (cm)	1.4 (3.6)	1.7 (4.3)	0.8 (2.0)	0 (0)	0 (0)	0 (0)	0 (0)	0 (0)	0 (0)	0 (0)	1.2 (3.0)	1.7 (4.3)	6.8 (17)

Average precipitation days (≥ 0.01 in)	18.2	14.7	16.9	14.3	12.0	9.1	5.0	4.8	7.9	13.1	18.4	17.6	152.0

Average snowy days (≥ 0.1 in)	1.3	0.9	0.5	0	0	0	0	0	0	0	0.3	1.6	4.6

Average relative humidity (%)	78.0	75.2	73.6	71.4	68.9	67.1	65.4	68.2	73.2	78.6	79.8	80.1	73.3

Mean monthly sunshine hours	69.8	108.8	178.4	207.3	253.7	268.4	312.0	281.4	221.7	142.6	72.7	52.9	2,169.7

Percent possible sunshine	25	38	48	51	54	56	65	64	59	42	26	20	49

Source: NOAA (relative humidity and sun 1961–1990)

Sentence(s)

From 1981 to 2010, the average annual precipitation measured at Seattle–Tacoma Airport was 37.49 inches (952 mm).

final_sentence: From 1981 to 2010, the average annual precipitation measured at Seattle–Tacoma Airport was 37.49 inches (952 mm).