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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
|location = Seattle (1981-2010) |name = Seattle weatherbox
|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 = {{{collapsed|}}}
|imperial first = Y

|Jan record high F = 64
|Jan record high F = 67
|Feb record high F = 70 |Feb record high F = 70
|Mar record high F = 78 |Mar record high F = 79
|Apr record high F = 85 |Apr record high F = 89
|May record high F = 93 |May record high F = 93
|Jun record high F = 96 |Jun record high F = 108
|Jul record high F = 103 |Jul record high F = 103
|Aug record high F = 99 |Aug record high F = 99
Line 14: Line 17:
|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 high F = 46.8
|Feb high F = 49.6 |Jan avg record high F = 57.0
|Mar high F = 53.4 |Feb avg record high F = 59.1
|Apr high F = 58.1 |Mar avg record high F = 66.4
|May high F = 64.3 |Apr avg record high F = 74.3
|Jun high F = 69.6 |May avg record high F = 81.9
|Jul high F = 75.5 |Jun avg record high F = 85.8
|Aug high F = 75.9 |Jul avg record high F = 91.2
|Sep high F = 70.1 |Aug avg record high F = 89.9
|Oct high F = 59.3 |Sep avg record high F = 84.1
|Nov high F = 50.5 |Oct avg record high F = 72.0
|Dec high F = 45.3 |Nov avg record high F = 61.6
|year high F = 59.9 |Dec avg record high F = 56.8
|Jan mean F = 41.8 |year avg record high F = 94.1

|Feb mean F = 43.2
|Mar mean F = 46.3 |Jan high F = 48.0
|Apr mean F = 50.2 |Feb high F = 50.3
|May mean F = 55.8 |Mar high F = 54.2
|Jun mean F = 60.7 |Apr high F = 59.3
|Jul mean F = 65.5 |May high F = 66.3
|Aug mean F = 65.9 |Jun high F = 71.1
|Sep mean F = 61.1 |Jul high F = 77.4
|Oct mean F = 52.6 |Aug high F = 77.6
|Nov mean F = 45.3 |Sep high F = 71.6
|Dec mean F = 40.4 |Oct high F = 60.5
|year mean F = 52.4 |Nov high F = 52.1
|Jan low F = 36.8 |Dec high F = 47.0
|Feb low F = 36.9 |year high F = 61.3

|Mar low F = 39.3
|Apr low F = 42.2 |Jan mean F = 42.8
|May low F = 47.3 |Feb mean F = 44.0
|Jun low F = 51.9 |Mar mean F = 47.1
|Jul low F = 55.6 |Apr mean F = 51.3
|Aug low F = 55.9 |May mean F = 57.5
|Sep low F = 52.1 |Jun mean F = 62.0
|Oct low F = 45.8 |Jul mean F = 67.1
|Nov low F = 40.0 |Aug mean F = 67.4
|Dec low F = 35.6 |Sep mean F = 62.6
|year low F = 45.0 |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 |Jan record low F = 0
|Feb record low F = 1 |Feb record low F = 1
Line 68: Line 103:
|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
|Mar snow inch = 0.4
|Apr snow inch = 0.0 |Apr snow inch = 0.0
|May snow inch = 0.0 |May snow inch = 0.0
Line 92: Line 129:
|Sep snow inch = 0.0 |Sep snow inch = 0.0
|Oct snow inch = 0.0 |Oct snow inch = 0.0
|Nov snow inch = 1.1 |Nov snow inch = 0.2
|Dec snow inch = 1.5 |Dec snow inch = 1.7
|year snow inch = 5.9 |year snow inch = 6.3

|unit precipitation days = 0.01 in |unit precipitation days = 0.01 in
|Jan precipitation days = 18.2 |Jan precipitation days = 18.7
|Feb precipitation days = 14.7 |Feb precipitation days = 15.9
|Mar precipitation days = 16.9 |Mar precipitation days = 17.1
|Apr precipitation days = 14.3 |Apr precipitation days = 15.0
|May precipitation days = 12.0 |May precipitation days = 11.3
|Jun precipitation days = 9.1 |Jun precipitation days = 9.2
|Jul precipitation days = 5.0 |Jul precipitation days = 4.7
|Aug precipitation days = 4.8 |Aug precipitation days = 4.9
|Sep precipitation days = 7.9 |Sep precipitation days = 8.3
|Oct precipitation days = 13.1 |Oct precipitation days = 14.3
|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 |unit snow days = 0.1 in
|Mar snow days = 0.5 |Jan snow days = 1.4
|Feb snow days = 1.2
|Mar snow days = 0.4
|Apr snow days = 0.0 |Apr snow days = 0.0
|May snow days = 0.0 |May snow days = 0.0
Line 119: Line 159:
|Sep snow days = 0.0 |Sep snow days = 0.0
|Oct snow days = 0.0 |Oct snow days = 0.0
|Nov snow days = 0.4 |Nov snow days = 0.2
|Dec snow days = 1.4 |Dec snow days = 1.5
|year snow days = 4.1 |year snow days = 4.7

|Jan sun = 71.3
|Feb sun = 109.2 |Jan sun = 69.8
|Mar sun = 179.8 |Feb sun = 108.8
|Apr sun = 207.0 |Mar sun = 178.4
|May sun = 254.2 |Apr sun = 207.3
|Jun sun = 267.0 |May sun = 253.7
|Jul sun = 313.1 |Jun sun = 268.4
|Aug sun = 282.1 |Jul sun = 312.0
|Sep sun = 222.0 |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 = 2173.0
|Jan percentsun = 25
|source 1 = NOAA (extremes 1948–present, sun 1961–1990)<ref name = NOAA >{{cite web
|Feb percentsun = 38
| url = http://www.nws.noaa.gov/climate/xmacis.php?wfo=sew
|Mar percentsun = 48
| title = NowData - NOAA Online Weather Data
|Apr percentsun = 51
| publisher = ]
|May percentsun = 54
| accessdate = 2011-12-15}}</ref><ref name = NOAAsun >{{cite web
|Jun percentsun = 56
| url = ftp://ftp.atdd.noaa.gov/pub/GCOS/WMO-Normals/TABLES/REG_IV/US/GROUP4/72793.TXT
|Jul percentsun = 65
| title = WMO Climate Normals for Seattle/Seattle–Tacoma INTL A, WA 1961–1990
|Aug percentsun = 64
| publisher = National Oceanic and Atmospheric Administration
|Sep percentsun = 59
| accessdate = October 31, 2013}}</ref>
|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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