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{{Update|date=November 2024|reason=Some of this data is more than five years old; parts are more than 10 years old}}
{{Weather box {{Weather box
|name = Seattle weatherbox
|location = Seattle (]), 1981–2010 normals
|location = Seattle (]), 1991–2020 normals,{{efn|Mean monthly maxima and minima (i.e. the highest and lowest temperature readings during an entire month or year) calculated based on data at said location from 1991 to 2020.}} extremes 1894–present{{efn|Official records are restricted to SeaTac Airport from January 1945 onward.<ref name = NOWData1b/>}}
|single line = Y |single line = Y
|collapsed = Y |collapsed = {{{collapsed|}}}

|Jan high F = 47.2
|Feb high F = 49.9 |Jan record high F = 67
|Mar high F = 53.7 |Feb record high F = 70
|Apr high F = 58.5 |Mar record high F = 79
|May high F = 64.7 |Apr record high F = 89
|Jun high F = 69.9 |May record high F = 93
|Jul high F = 75.8 |Jun record high F = 108
|Aug high F = 76.3
|Sep high F = 70.5
|Oct high F = 59.7
|Nov high F = 50.9
|Dec high F = 45.7
|year high F= 60.2
|Jan mean F= 42.0
|Feb mean F= 43.4
|Mar mean F= 46.5
|Apr mean F= 50.3
|May mean F= 56.0
|Jun mean F= 60.9
|Jul mean F= 65.7
|Aug mean F= 66.1
|Sep mean F= 61.3
|Oct mean F= 52.7
|Nov mean F= 45.4
|Dec mean F= 40.6
|year mean F= 52.6
|Jan low F = 36.9
|Feb low F = 36.9
|Mar low F = 39.3
|Apr low F = 42.2
|May low F = 47.3
|Jun low F = 51.9
|Jul low F = 55.6
|Aug low F = 55.9
|Sep low F = 52.1
|Oct low F = 45.8
|Nov low F = 40.0
|Dec low F = 35.6
|year low F= 45.0
|Jan record high F = 64
|Feb record high F = 70
|Mar record high F = 78
|Apr record high F = 85
|May record high F = 93
|Jun record high F = 96
|Jul record high F = 103 |Jul record high F = 103
|Aug record high F = 99 |Aug record high F = 99
|Sep record high F = 98 |Sep record high F = 98
|Oct record high F = 89 |Oct record high F = 89
|Nov record high F = 74 |Nov record high F = 74
|Dec record high F = 64 |Dec record high F = 66
|year record high F= 103 |year record high F = 108

|Jan record low F = 0
|Feb record low F = 1 |Jan avg record high F = 57.0
|Feb avg record high F = 59.1
|Mar avg record high F = 66.4
|Apr avg record high F = 74.3
|May avg record high F = 81.9
|Jun avg record high F = 85.8
|Jul avg record high F = 91.2
|Aug avg record high F = 89.9
|Sep avg record high F = 84.1
|Oct avg record high F = 72.0
|Nov avg record high F = 61.6
|Dec avg record high F = 56.8
|year avg record high F = 94.1

|Jan high F = 48.0
|Feb high F = 50.3
|Mar high F = 54.2
|Apr high F = 59.3
|May high F = 66.3
|Jun high F = 71.1
|Jul high F = 77.4
|Aug high F = 77.6
|Sep high F = 71.6
|Oct high F = 60.5
|Nov high F = 52.1
|Dec high F = 47.0
|year high F = 61.3

|Jan mean F = 42.8
|Feb mean F = 44.0
|Mar mean F = 47.1
|Apr mean F = 51.3
|May mean F = 57.5
|Jun mean F = 62.0
|Jul mean F = 67.1
|Aug mean F = 67.4
|Sep mean F = 62.6
|Oct mean F = 53.8
|Nov mean F = 46.5
|Dec mean F = 42.0
|year mean F = 53.7

|Jan low F = 37.7
|Feb low F = 37.7
|Mar low F = 39.9
|Apr low F = 43.3
|May low F = 48.7
|Jun low F = 53.0
|Jul low F = 56.8
|Aug low F = 57.2
|Sep low F = 53.6
|Oct low F = 47.0
|Nov low F = 40.9
|Dec low F = 37.1
|year low F = 46.1

|Jan avg record low F = 26.1
|Feb avg record low F = 27.3
|Mar avg record low F = 31.3
|Apr avg record low F = 35.6
|May avg record low F = 40.6
|Jun avg record low F = 46.6
|Jul avg record low F = 51.5
|Aug avg record low F = 51.7
|Sep avg record low F = 45.8
|Oct avg record low F = 36.8
|Nov avg record low F = 29.2
|Dec avg record low F = 25.4
|year avg record low F= 21.5

|Jan record low F = 0
|Feb record low F = 1
|Mar record low F = 11 |Mar record low F = 11
|Apr record low F = 29 |Apr record low F = 29
Line 65: Line 100:
|Sep record low F = 35 |Sep record low F = 35
|Oct record low F = 28 |Oct record low F = 28
|Nov record low F = 6 |Nov record low F = 6
|Dec record low F = 6 |Dec record low F = 6
|year record low F= 0 |year record low F = 0

|precipitation colour = green |precipitation colour = green
|Jan precipitation inch = 5.56 |Jan precipitation inch = 5.78
|Feb precipitation inch = 3.50 |Feb precipitation inch = 3.76
|Mar precipitation inch = 3.72 |Mar precipitation inch = 4.17
|Apr precipitation inch = 2.71 |Apr precipitation inch = 3.18
|May precipitation inch = 1.93 |May precipitation inch = 1.88
|Jun precipitation inch = 1.56 |Jun precipitation inch = 1.45
|Jul precipitation inch = 0.70 |Jul precipitation inch = 0.60
|Aug precipitation inch = 0.88 |Aug precipitation inch = 0.97
|Sep precipitation inch = 1.45 |Sep precipitation inch = 1.61
|Oct precipitation inch = 3.48 |Oct precipitation inch = 3.91
|Nov precipitation inch = 6.57 |Nov precipitation inch = 6.31
|Dec precipitation inch = 5.35 |Dec precipitation inch = 5.72
|year precipitation inch=37.41 |year precipitation inch = 39.34

|Jan snow inch = 1.3
|Feb snow inch = 1.4 |Jan snow inch = 1.8
|Mar snow inch = 0.7 |Feb snow inch = 2.2
|Apr snow inch = 0 |Mar snow inch = 0.4
|May snow inch = 0 |Apr snow inch = 0.0
|Jun snow inch = 0 |May snow inch = 0.0
|Jul snow inch = 0 |Jun snow inch = 0.0
|Aug snow inch = 0 |Jul snow inch = 0.0
|Sep snow inch = 0 |Aug snow inch = 0.0
|Oct snow inch = 0 |Sep snow inch = 0.0
|Nov snow inch = 1.1 |Oct snow inch = 0.0
|Dec snow inch = 1.5 |Nov snow inch = 0.2
|year snow inch= 5.9 |Dec snow inch = 1.7
|year snow inch = 6.3

|unit precipitation days = 0.01 in |unit precipitation days = 0.01 in
|unit snow days = 0.1 in |Jan precipitation days = 18.7
|Jan precipitation days = 18.2 |Feb precipitation days = 15.9
|Feb precipitation days = 14.7 |Mar precipitation days = 17.1
|Mar precipitation days = 16.9 |Apr precipitation days = 15.0
|Apr precipitation days = 14.3 |May precipitation days = 11.3
|May precipitation days = 12.0 |Jun precipitation days = 9.2
|Jun precipitation days = 9.1 |Jul precipitation days = 4.7
|Jul precipitation days = 5.0 |Aug precipitation days = 4.9
|Aug precipitation days = 4.8 |Sep precipitation days = 8.3
|Sep precipitation days = 7.9 |Oct precipitation days = 14.3
|Oct precipitation days = 13.1
|Nov precipitation days = 18.4 |Nov precipitation days = 18.4
|Dec precipitation days = 17.6 |Dec precipitation days = 18.4
|year precipitation days=152.0 |year precipitation days = 156.2
|Jan snow days = 1.1
|Feb snow days = 0.7
|Mar snow days = 0.5
|Apr snow days = 0
|May snow days = 0
|Jun snow days = 0
|Jul snow days = 0
|Aug snow days = 0
|Sep snow days = 0
|Oct snow days = 0
|Nov snow days = 0.4
|Dec snow days = 1.4
|year snow days= 4.1


|Jan sun = 69.8 |unit snow days = 0.1 in
|Jan snow days = 1.4
|Feb snow days = 1.2
|Mar snow days = 0.4
|Apr snow days = 0.0
|May snow days = 0.0
|Jun snow days = 0.0
|Jul snow days = 0.0
|Aug snow days = 0.0
|Sep snow days = 0.0
|Oct snow days = 0.0
|Nov snow days = 0.2
|Dec snow days = 1.5
|year snow days = 4.7

|Jan sun = 69.8
|Feb sun = 108.8 |Feb sun = 108.8
|Mar sun = 178.4 |Mar sun = 178.4
Line 134: Line 173:
|Sep sun = 221.7 |Sep sun = 221.7
|Oct sun = 142.6 |Oct sun = 142.6
|Nov sun = 72.7 |Nov sun = 72.7
|Dec sun = 52.9 |Dec sun = 52.9

|source 1 = NOAA (extremes 1948–present, sun 1961–1990)<ref name = NOAA >{{cite web
|Jan percentsun = 25
| url = http://www.nws.noaa.gov/climate/xmacis.php?wfo=sew
|Feb percentsun = 38
| title = NowData - NOAA Online Weather Data
|Mar percentsun = 48
| publisher = ]
|Apr percentsun = 51
| accessdate = 2011-12-15}}</ref><ref name = NOAAsun >{{cite web
|May percentsun = 54
| url = ftp://ftp.atdd.noaa.gov/pub/GCOS/WMO-Normals/TABLES/REG_IV/US/GROUP4/72793.TXT
|Jun percentsun = 56
| title = WMO Climate Normals for Seattle/Seattle–Tacoma INTL A, WA 1961–1990
|Jul percentsun = 65
| publisher = National Oceanic and Atmospheric Administration
|Aug percentsun = 64
| accessdate = October 31, 2013}}</ref>
|Sep percentsun = 59
|Oct percentsun = 42
|Nov percentsun = 26
|Dec percentsun = 20
|year percentsun = 49

|Jan humidity = 78.0
|Feb humidity = 75.2
|Mar humidity = 73.6
|Apr humidity = 71.4
|May humidity = 68.9
|Jun humidity = 67.1
|Jul humidity = 65.4
|Aug humidity = 68.2
|Sep humidity = 73.2
|Oct humidity = 78.6
|Nov humidity = 79.8
|Dec humidity = 80.1
|year humidity = 73.3

|Jan dew point C = 0.6
|Feb dew point C = 1.7
|Mar dew point C = 2.4
|Apr dew point C = 3.8
|May dew point C = 6.4
|Jun dew point C = 9.0
|Jul dew point C = 10.8
|Aug dew point C = 11.5
|Sep dew point C = 10.1
|Oct dew point C = 7.3
|Nov dew point C = 3.8
|Dec dew point C = 1.3

|Jan uv = 1
|Feb uv = 2
|Mar uv = 3
|Apr uv = 5
|May uv = 6
|Jun uv = 7
|Jul uv = 7
|Aug uv = 6
|Sep uv = 5
|Oct uv = 3
|Nov uv = 1
|Dec uv = 1

|source 1 = NOAA (relative humidity, dew point and sun 1961–1990)<ref name = NOWData1b>{{cite web
|url = https://www.weather.gov/wrh/Climate?wfo=sew
|title = NowData – NOAA Online Weather Data
|publisher = ]
|access-date = June 27, 2021}}</ref><ref name="Seattle Weatherbox NOAA txt">{{cite web
|url=https://www.ncei.noaa.gov/access/services/data/v1?dataset=normals-monthly-1991-2020&startDate=0001-01-01&endDate=9996-12-31&stations=USW00024233&format=pdf
|publisher=National Oceanic and Atmospheric Administration
|title=Summary of Monthly Normals 1991–2020
|access-date=May 20, 2021}}</ref><ref name = NOAAsun>{{cite web
|url = ftp://ftp.atdd.noaa.gov/pub/GCOS/WMO-Normals/TABLES/REG_IV/US/GROUP4/72793.TXT
|title = WMO Climate Normals for Seattle/Seattle–Tacoma INTL A, WA 1961–1990
|publisher = National Oceanic and Atmospheric Administration
|access-date = July 18, 2020
|archive-url = https://web.archive.org/web/20230627105435/ftp://ftp.atdd.noaa.gov/pub/GCOS/WMO-Normals/TABLES/REG_IV/US/GROUP4/72793.TXT
|archive-date = 2023-06-27}}</ref>
|source 2 = Weather Atlas (UV)<ref>
{{Cite web
|url = https://www.weather-atlas.com/en/washington-usa/seattle-climate
|title = Seattle, WA - Detailed climate information and monthly weather forecast
|publisher = Yu Media Group
|website = Weather Atlas
|language = en
|access-date = January 1, 2020
}}
</ref>
}}<noinclude> }}<noinclude>

{{Template reference list}}
==Notes==
]
{{notelist}}
</noinclude>
==References==
{{reflist}}
]
]</noinclude>

Latest revision as of 07:35, 26 November 2024

This template needs to be updated. The reason given is: Some of this data is more than five years old; parts are more than 10 years old. Please help update this template to reflect recent events or newly available information. Relevant discussion may be found on the talk page. (November 2024)
Climate data for Seattle (SeaTac Airport), 1991–2020 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) 		108
(42) 		103
(39) 		99
(37) 		98
(37) 		89
(32) 		74
(23) 		66
(19) 		108
(42)
Mean maximum °F (°C) 57.0
(13.9) 		59.1
(15.1) 		66.4
(19.1) 		74.3
(23.5) 		81.9
(27.7) 		85.8
(29.9) 		91.2
(32.9) 		89.9
(32.2) 		84.1
(28.9) 		72.0
(22.2) 		61.6
(16.4) 		56.8
(13.8) 		94.1
(34.5)
Mean daily maximum °F (°C) 48.0
(8.9) 		50.3
(10.2) 		54.2
(12.3) 		59.3
(15.2) 		66.3
(19.1) 		71.1
(21.7) 		77.4
(25.2) 		77.6
(25.3) 		71.6
(22.0) 		60.5
(15.8) 		52.1
(11.2) 		47.0
(8.3) 		61.3
(16.3)
Daily mean °F (°C) 42.8
(6.0) 		44.0
(6.7) 		47.1
(8.4) 		51.3
(10.7) 		57.5
(14.2) 		62.0
(16.7) 		67.1
(19.5) 		67.4
(19.7) 		62.6
(17.0) 		53.8
(12.1) 		46.5
(8.1) 		42.0
(5.6) 		53.7
(12.1)
Mean daily minimum °F (°C) 37.7
(3.2) 		37.7
(3.2) 		39.9
(4.4) 		43.3
(6.3) 		48.7
(9.3) 		53.0
(11.7) 		56.8
(13.8) 		57.2
(14.0) 		53.6
(12.0) 		47.0
(8.3) 		40.9
(4.9) 		37.1
(2.8) 		46.1
(7.8)
Mean minimum °F (°C) 26.1
(−3.3) 		27.3
(−2.6) 		31.3
(−0.4) 		35.6
(2.0) 		40.6
(4.8) 		46.6
(8.1) 		51.5
(10.8) 		51.7
(10.9) 		45.8
(7.7) 		36.8
(2.7) 		29.2
(−1.6) 		25.4
(−3.7) 		21.5
(−5.8)
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) 5.78
(147) 		3.76
(96) 		4.17
(106) 		3.18
(81) 		1.88
(48) 		1.45
(37) 		0.60
(15) 		0.97
(25) 		1.61
(41) 		3.91
(99) 		6.31
(160) 		5.72
(145) 		39.34
(999)
Average snowfall inches (cm) 1.8
(4.6) 		2.2
(5.6) 		0.4
(1.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.2
(0.51) 		1.7
(4.3) 		6.3
(16)
Average precipitation days (≥ 0.01 in) 18.7 15.9 17.1 15.0 11.3 9.2 4.7 4.9 8.3 14.3 18.4 18.4 156.2
Average snowy days (≥ 0.1 in) 1.4 1.2 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 1.5 4.7
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
Average dew point °F (°C) 33.1
(0.6) 		35.1
(1.7) 		36.3
(2.4) 		38.8
(3.8) 		43.5
(6.4) 		48.2
(9.0) 		51.4
(10.8) 		52.7
(11.5) 		50.2
(10.1) 		45.1
(7.3) 		38.8
(3.8) 		34.3
(1.3) 		42.3
(5.7)
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
Average ultraviolet index 1 2 3 5 6 7 7 6 5 3 1 1 4
Source 1: NOAA (relative humidity, dew point and sun 1961–1990)
Source 2: Weather Atlas (UV)

Notes

  1. Mean monthly maxima and minima (i.e. the highest and lowest temperature readings during an entire month or year) calculated based on data at said location from 1991 to 2020.
  2. Official records are restricted to SeaTac Airport from January 1945 onward.

References

  1. ^ "NowData – NOAA Online Weather Data". National Oceanic and Atmospheric Administration. Retrieved June 27, 2021.
  2. "Summary of Monthly Normals 1991–2020". National Oceanic and Atmospheric Administration. Retrieved May 20, 2021.
  3. "WMO Climate Normals for Seattle/Seattle–Tacoma INTL A, WA 1961–1990". National Oceanic and Atmospheric Administration. Archived from the original on 2023-06-27. Retrieved July 18, 2020.
  4. "Seattle, WA - Detailed climate information and monthly weather forecast". Weather Atlas. Yu Media Group. Retrieved January 1, 2020.
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