December 2021 Weather History at Seattle-Tacoma International Airport Washington, United States

This report shows the past weather for Seattle-Tacoma International Airport, providing a weather history for December 2021. It features all historical weather data series we have available, including the Seattle-Tacoma International Airport temperature history for December 2021. You can drill down from year to month and even day level reports by clicking on the graphs.

Seattle-Tacoma International Airport Temperature History December 2021

Temperature history in December 2021 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313115°F15°F20°F20°F25°F25°F30°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°FNovJan
The daily range of reported temperatures (gray bars) and 24-hour highs (red ticks) and lows (blue ticks), placed over the daily average high (faint red line) and low (faint blue line) temperature, with 25th to 75th and 10th to 90th percentile bands.

Hourly Temperature in December 2021 at Seattle-Tacoma International Airport

Hourly Temperature in December 2021 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMNovJanfreezingvery coldcoldcool
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The hourly reported temperature, color coded into bands. The shaded overlays indicate night and civil twilight.
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Cloud Cover in December 2021 at Seattle-Tacoma International Airport

Cloud Cover in December 2021 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMNovJan
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
no significant cloudno cloud detectedceiling and visibility ok
The hourly reported cloud coverage, categorized by the percentage of the sky covered by clouds.

Daily Precipitation in December 2021 at Seattle-Tacoma International Airport

Daily Precipitation in December 2021 at Seattle-Tacoma International Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 in3.0 in3.0 in3.5 in3.5 inNovJan
The daily measured quantity of liquid or liquid-equivalent precipitation.

Snow Depth in December 2021 at Seattle-Tacoma International Airport

Snow Depth in December 2021 at Seattle-Tacoma International Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 inNovJan
The daily measured snow depth, where available.

Observed Weather in December 2021 at Seattle-Tacoma International Airport

Observed Weather in December 2021 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMNovJan
foghazedrizzlelight rainmoderate rainheavy rainfreezing rainsleetsnow grainslight snowmoderate snowheavy snowhailthunderstorm
The hourly observed weather, color coded by category (in order of severity). If multiple reports are present, the most severe code is shown.
DayObservationsPrecipitationCodes
Thu, Dec 2 Light Rain, Mist0.11 in-RA, BR
Sat, Dec 4 Rain, Light Rain, Mist0.47 inRA, -RA, BR
Sun, Dec 5 Light Snow, Light Rain, Mist0.00 in-SN, -RA, BR
Mon, Dec 6 Light Rain, Light Drizzle, Fog, Mist0.10 in-RA, -DZ, FG, BR
Tue, Dec 7 Light Rain, Fog, Mist0.07 in-RA, FG, BR
Wed, Dec 8 Light Rain, Mist0.03 in-RA, BR
Fri, Dec 10 Light Rain0.14 in-RA
Sat, Dec 11 Light Rain and Ice Pellets, Light Rain, Mist0.48 in-RAPL, -RA, BR
Sun, Dec 12 Rain, Light Rain, Mist0.17 inRA, -RA, BR
Mon, Dec 13 Light Rain, Mist0.14 in-RA, BR
Tue, Dec 14 Light Rain, Mist0.14 in-RA, BR
Wed, Dec 15 Light Rain0.08 in-RA
Thu, Dec 16 Light Rain, Mist0.05 in-RA, BR
Fri, Dec 17 Light Rain, Fog, Mist0.18 in-RA, FG, BR
Sat, Dec 18 Light Rain, Mist0.23 in-RA, BR
Sun, Dec 19 Light Rain, Mist0.00 in-RA, BR
Mon, Dec 20 Light Snow, Light Rain and Snow, Light Rain, Light Drizzle, Mist0.26 in-SN, -RASN, -RA, -DZ, BR
Tue, Dec 21 Light Rain, Mist0.19 in-RA, BR
Wed, Dec 22 Rain, Light Rain, Mist0.43 inRA, -RA, BR
Thu, Dec 23 Rain, Light Rain, Mist0.16 inRA, -RA, BR
Fri, Dec 24 Rain, Light Rain, Mist0.27 inRA, -RA, BR
Sat, Dec 25 Light Snow, Light Rain and Snow, Light Rain, Mist0.13 in-SN, -RASN, -RA, BR
Sun, Dec 26 Snow, Light Snow, Freezing Fog, Mist0.26 inSN, -SN, FZFG, BR
Mon, Dec 27 Light Snow, Mist0.03 in-SN, BR
Tue, Dec 28 Light Snow, Mist0.00 in-SN, BR
Wed, Dec 29 Snow, Light Snow, Mist0.13 inSN, -SN, BR
Thu, Dec 30 Light Snow, Mist0.11 in-SN, BR
Fri, Dec 31 Light Snow0.00 in-SN

Hours of Daylight and Twilight in December 2021 at Seattle-Tacoma International Airport

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

Sunrise & Sunset with Twilight in December 2021 at Seattle-Tacoma International Airport

Sunrise & Sunset with Twilight in December 2021 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNovJan7:36 AM7:36 AMDec 14:20 PMDec 14:20 PM7:56 AM7:56 AMDec 314:28 PMDec 314:28 PM7:47 AM7:47 AMDec 114:18 PMDec 114:18 PM7:54 AM7:54 AMDec 214:21 PMDec 214:21 PM
The solar day over the course of December 2021. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Solar Elevation and Azimuth in December 2021 at Seattle-Tacoma International Airport

Solar Elevation and Azimuth in December 2021 at Seattle-Tacoma International AirportDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNovJan0010102000101020
northeastsouthwest
Solar elevation and azimuth over the course of December 2021. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

Moon Rise, Set & Phases in December 2021 at Seattle-Tacoma International Airport

Moon Rise, Set & Phases in December 2021 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNovJanDec 311:44 PMDec 311:44 PMDec 188:36 PMDec 188:36 PMJan 210:34 AMJan 210:34 AM6:53 AM6:53 AM3:54 PM3:54 PM3:51 PM3:51 PM8:39 AM8:39 AM8:19 AM8:19 AM4:21 PM4:21 PM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.
Dec 2021IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
10%4:02 AMESE2:53 PMWSW-9:29 AMS225,966 mi
2
4%5:26 AMESE3:20 PMWSW-10:23 AMS223,383 mi
3
0%6:53 AMESE3:54 PMWSW-11:23 AMS221,938 mi
4
0%8:19 AMSE4:39 PMSW-12:29 PMS221,818 mi
5
4%9:37 AMSE5:38 PMSW-1:37 PMS223,046 mi
6
10%10:40 AMSE6:49 PMSW-2:45 PMS225,460 mi
7
19%11:28 AMSE8:08 PMSW-3:48 PMS228,753 mi
8
29%12:04 PMESE9:27 PMWSW-4:45 PMS232,554 mi
9
40%12:31 PMESE10:43 PMWSW-5:36 PMS236,502 mi
10
50%12:53 PMESE11:56 PMW-6:23 PMS240,292 mi
11
61%1:11 PME--7:06 PMS243,702 mi
12
71%-1:05 AMW1:28 PME7:48 PMS246,594 mi
13
79%-2:12 AMW1:45 PME8:28 PMS248,897 mi
14
87%-3:19 AMWNW2:03 PMENE9:10 PMS250,599 mi
15
93%-4:25 AMWNW2:23 PMENE9:52 PMS251,728 mi
16
97%-5:32 AMWNW2:46 PMENE10:37 PMS252,333 mi
17
99%-6:38 AMNW3:15 PMNE11:24 PMS252,464 mi
18
100%-7:41 AMNW3:51 PMNE--
19
100%-8:39 AMNW4:36 PMNE12:13 AMS252,165 mi
20
99%-9:30 AMNW5:30 PMNE1:04 AMS251,461 mi
21
96%-10:12 AMNW6:32 PMNE1:54 AMS250,353 mi
22
91%-10:46 AMNW7:38 PMENE2:43 AMS248,827 mi
23
84%-11:14 AMWNW8:48 PMENE3:31 AMS246,864 mi
24
76%-11:37 AMWNW9:58 PMENE4:17 AMS244,451 mi
25
66%-11:57 AMWNW11:10 PME5:02 AMS241,604 mi
26
50%-12:16 PMW-5:46 AMS238,383 mi
27
45%12:22 AME12:34 PMW-6:31 AMS234,911 mi
28
33%1:38 AME12:54 PMWSW-7:17 AMS231,381 mi
29
23%2:56 AMESE1:17 PMWSW-8:08 AMS228,058 mi
30
13%4:19 AMESE1:46 PMWSW-9:03 AMS225,258 mi
31
6%5:44 AMSE2:24 PMSW-10:04 AMS223,308 mi

Humidity Comfort Levels in December 2021 at Seattle-Tacoma International Airport

Humidity Comfort Levels in December 2021 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMNovJan
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The hourly reported humidity comfort level, categorized by dew point. The shaded overlays indicate night and civil twilight.

Wind Speed in December 2021 at Seattle-Tacoma International Airport

Wind Speed in December 2021 at Seattle-Tacoma International Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 mph0 mph10 mph10 mph20 mph20 mph30 mph30 mph40 mph40 mph50 mph50 mphNovJan
The daily range of reported wind speeds (gray bars), with maximum gust speeds (red ticks).

Hourly Wind Speed in December 2021 at Seattle-Tacoma International Airport

Hourly Wind Speed in December 2021 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMNovJan
0 mph calm 1 mph light air 4 mph light breeze 8 mph gentle breeze 13 mph moderate breeze 18 mph fresh breeze 25 mph strong breeze 31 mph near gale 39 mph gale 47 mph strong gale 55 mph storm 64 mph violent storm 73 mph hurricane force
The hourly reported wind speed, color coded into bands according to the Beaufort scale. The shaded overlays indicate night and civil twilight.

Hourly Wind Direction in 2021 at Seattle-Tacoma International Airport

Hourly Wind Direction in 2021 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMNovJan
calmnortheastsouthwest
The hourly reported wind direction, color coded by compass point. The shaded overlays indicate night and civil twilight.

Atmospheric Pressure in December 2021 at Seattle-Tacoma International Airport

Atmospheric Pressure in December 2021 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313129.2 inHg29.2 inHg29.4 inHg29.4 inHg29.6 inHg29.6 inHg29.8 inHg29.8 inHg30.0 inHg30.0 inHg30.2 inHg30.2 inHg30.4 inHg30.4 inHg30.6 inHg30.6 inHgNovJan
The daily range of atmospheric pressure (gray bars), as measured by the altimeter setting reported in e.g. a METAR report.

Number of Reports by Day in December 2021 at Seattle-Tacoma International Airport Winter 2021

Number of Reports by Day in December 2021 at Seattle-Tacoma International Airport181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131002020404060608080100100NovJan
regularspecialcorrection
The number of reports per day.

Reports by Hour in December 2021 at Seattle-Tacoma International Airport Winter 2021

Reports by Hour in December 2021 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMNovJan
regularspecialcorrection
Indication of what types of reports were recorded during each hour.

This report graphically illustrates the historical weather reports recorded by the weather station at Seattle-Tacoma International Airport in December 2021.

METAR Reports

Airport weather stations throughout the world routinely issue METAR weather reports . Such reports are used by pilots, air traffic controllers, meteorologists, climatologists, and other researchers. They are published via radio transmission and on the internet. We have been collecting and archiving published METAR reports since 2011, and have found third-party sources for archived reports from years prior to that.

ISD Reports

The Integrated Surface Database (ISD), maintained and published by NOAA's National Center for Environmental Information , consists of hourly and synoptic weather reports from a variety of sources. We use ISD data to complement and backfill for our METAR archive.

Other Data

The sources for the averages shown in the daily temperature chart are discussed in greater detail on this station's Averages Report.

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

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