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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
|collapsed = Y
|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/>}}
|location = Seattle (])
|single line = Y |single line = Y
|collapsed = {{{collapsed|}}}
|Jan high F = 45.8

|Feb high F = 49.5
|Mar high F = 53.2 |Jan record high F = 67
|Apr high F = 58.2 |Feb record high F = 70
|May high F = 64.4 |Mar record high F = 79
|Jun high F = 69.6 |Apr record high F = 89
|Jul high F = 75.3 |May record high F = 93
|Aug high F = 75.6 |Jun record high F = 108
|Sep high F = 70.2 |Jul record high F = 103
|Oct high F = 59.7 |Aug record high F = 99
|Nov high F = 50.5 |Sep record high F = 98
|Dec high F = 45.5 |Oct record high F = 89
|year high F = 59.8 |Nov record high F = 74
|Jan low F = 35.9 |Dec record high F = 66
|Feb low F = 37.2 |year record high F = 108

|Mar low F = 39.1
|Apr low F = 42.1 |Jan avg record high F = 57.0
|May low F = 47.2 |Feb avg record high F = 59.1
|Jun low F = 51.7 |Mar avg record high F = 66.4
|Jul low F = 55.3 |Apr avg record high F = 74.3
|Aug low F = 55.7 |May avg record high F = 81.9
|Sep low F = 51.9 |Jun avg record high F = 85.8
|Oct low F = 45.7 |Jul avg record high F = 91.2
|Nov low F = 39.9 |Aug avg record high F = 89.9
|Dec low F = 35.9 |Sep avg record high F = 84.1
|year low F = 44.8 |Oct avg record high F = 72.0
|Nov avg record high F = 61.6
|Jan precipitation inch = 5.13
|Dec avg record high F = 56.8
|Feb precipitation inch = 4.18
|year avg record high F = 94.1
|Mar precipitation inch = 3.75

|Apr precipitation inch = 2.59
|May precipitation inch = 1.78 |Jan high F = 48.0
|Jun precipitation inch = 1.49 |Feb high F = 50.3
|Jul precipitation inch = .79 |Mar high F = 54.2
|Aug precipitation inch = 1.02 |Apr high F = 59.3
|Sep precipitation inch = 1.63 |May high F = 66.3
|Oct precipitation inch = 3.19 |Jun high F = 71.1
|Nov precipitation inch = 5.90 |Jul high F = 77.4
|Dec precipitation inch = 5.62 |Aug high F = 77.6
|scprecip = green |Sep high F = 71.6
|year precipitation inch = 37.07 |Oct high F = 60.5
|Jan snow inch = 2.1 |Nov high F = 52.1
|Feb snow inch = 1.3 |Dec high F = 47.0
|Mar snow inch = 0.6 |year high F = 61.3

|Apr snow inch = 0
|May snow inch = 0 |Jan mean F = 42.8
|Jun snow inch = 0 |Feb mean F = 44.0
|Jul snow inch = 0 |Mar mean F = 47.1
|Aug snow inch = 0 |Apr mean F = 51.3
|Sep snow inch = 0 |May mean F = 57.5
|Oct snow inch = 0 |Jun mean F = 62.0
|Nov snow inch = 1.1 |Jul mean F = 67.1
|Dec snow inch = 1.9 |Aug mean F = 67.4
|year snow inch = 7.1 |Sep mean F = 62.6
|Jan precipitation days = 17.8 |Oct mean F = 53.8
|Feb precipitation days = 15.7 |Nov mean F = 46.5
|Mar precipitation days = 16.4 |Dec mean F = 42.0
|Apr precipitation days = 13.6 |year mean F = 53.7

|May precipitation days = 11.6
|Jun precipitation days = 8.5 |Jan low F = 37.7
|Jul precipitation days = 5.3 |Feb low F = 37.7
|Aug precipitation days = 5.5 |Mar low F = 39.9
|Sep precipitation days = 8.3 |Apr low F = 43.3
|Oct precipitation days = 11.7 |May low F = 48.7
|Nov precipitation days = 17.9 |Jun low F = 53.0
|Dec precipitation days = 17.8 |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
|Apr record low F = 29
|May record low F = 28
|Jun record low F = 38
|Jul record low F = 43
|Aug record low F = 44
|Sep record low F = 35
|Oct record low F = 28
|Nov record low F = 6
|Dec record low F = 6
|year record low F = 0

|precipitation colour = green
|Jan precipitation inch = 5.78
|Feb precipitation inch = 3.76
|Mar precipitation inch = 4.17
|Apr precipitation inch = 3.18
|May precipitation inch = 1.88
|Jun precipitation inch = 1.45
|Jul precipitation inch = 0.60
|Aug precipitation inch = 0.97
|Sep precipitation inch = 1.61
|Oct precipitation inch = 3.91
|Nov precipitation inch = 6.31
|Dec precipitation inch = 5.72
|year precipitation inch = 39.34

|Jan snow inch = 1.8
|Feb snow inch = 2.2
|Mar snow inch = 0.4
|Apr snow inch = 0.0
|May snow inch = 0.0
|Jun snow inch = 0.0
|Jul snow inch = 0.0
|Aug snow inch = 0.0
|Sep snow inch = 0.0
|Oct snow inch = 0.0
|Nov snow inch = 0.2
|Dec snow inch = 1.7
|year snow inch = 6.3

|unit precipitation days = 0.01 in |unit precipitation days = 0.01 in
|Jan snow days = 1.8 |Jan precipitation days = 18.7
|Feb snow days = 0.9 |Feb precipitation days = 15.9
|Mar snow days = 0.4 |Mar precipitation days = 17.1
|Apr snow days = 0 |Apr precipitation days = 15.0
|May snow days = 0 |May precipitation days = 11.3
|Jun snow days = 0 |Jun precipitation days = 9.2
|Jul snow days = 0 |Jul precipitation days = 4.7
|Aug snow days = 0 |Aug precipitation days = 4.9
|Sep snow days = 0 |Sep precipitation days = 8.3
|Oct snow days = 0 |Oct precipitation days = 14.3
|Nov snow days = 0.6 |Nov precipitation days = 18.4
|Dec snow days = 1.6 |Dec precipitation days = 18.4
|year precipitation days = 156.2

|unit snow days = 0.1 in |unit snow days = 0.1 in
|Jan sun = 71.3 |Jan snow days = 1.4
|Feb sun = 110.2 |Feb snow days = 1.2
|Mar sun = 179.8 |Mar snow days = 0.4
|Apr sun = 207.0 |Apr snow days = 0.0
|May sun = 254.2 |May snow days = 0.0
|Jun sun = 267.0 |Jun snow days = 0.0
|Jul sun = 313.1 |Jul snow days = 0.0
|Aug sun = 282.1 |Aug snow days = 0.0
|Sep sun = 222.0 |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
|Mar sun = 178.4
|Apr sun = 207.3
|May sun = 253.7
|Jun sun = 268.4
|Jul sun = 312.0
|Aug sun = 281.4
|Sep sun = 221.7
|Oct sun = 142.6 |Oct sun = 142.6
|Nov sun = 72.0 |Nov sun = 72.7
|Dec sun = 52.7 |Dec sun = 52.9

|year sun = 2174
|Jan percentsun = 25
|source 1 = NOAA <REF NAME = NWS >{{cite web
|Feb percentsun = 38
| url=http://www.weather.gov/climate/xmacis.php?wfo=sew
|Mar percentsun = 48
| title=NOW Data-NOAA Online Weather Data
|Apr percentsun = 51
| publisher=National Oceanic and Atmospheric Administration
|May percentsun = 54
| year=2009
|Jun percentsun = 56
| accessdate=04/8/2009}}</ref>
|Jul percentsun = 65
|source 2 = HKO <ref name= HKO >{{cite web
|Aug percentsun = 64
| url = http://www.hko.gov.hk/wxinfo/climat/world/eng/n_america/us/seattle_e.htm
|Sep percentsun = 59
| title = Climatological Normals of Seattle
|Oct percentsun = 42
| accessdate = 2010-05-11
|Nov percentsun = 26
| publisher = ] }}</ref>
|Dec percentsun = 20
|date=August 2010
|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>


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