December 2017 Weather History at Portland–Troutdale Airport Oregon, United States

This report shows the past weather for Portland–Troutdale Airport, providing a weather history for December 2017. It features all historical weather data series we have available, including the Portland–Troutdale Airport temperature history for December 2017. You can drill down from year to month and even day level reports by clicking on the graphs.

Portland–Troutdale Airport Temperature History December 2017

Temperature history in December 2017 at Portland–Troutdale Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313125°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 2017 at Portland–Troutdale Airport

Hourly Temperature in December 2017 at Portland–Troutdale Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMNovJanvery coldcold
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 2017 at Portland–Troutdale Airport

Cloud Cover in December 2017 at Portland–Troutdale 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 2017 at Portland–Troutdale Airport

Daily Precipitation in December 2017 at Portland–Troutdale Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 inNovJan
The daily measured quantity of liquid or liquid-equivalent precipitation.

Observed Weather in December 2017 at Portland–Troutdale Airport

Observed Weather in December 2017 at Portland–Troutdale 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
Fri, Dec 1 Light Rain, Mist0.15 in-RA, BR
Sat, Dec 2 Light Rain0.24 in-RA
Sun, Dec 3 Light Rain, Mist0.07 in-RA, BR
Fri, Dec 15 Light Rain, Mist0.01 in-RA, BR
Sat, Dec 16 Light Rain, Mist0.05 in-RA, BR
Sun, Dec 17 Light Rain, Mist0.02 in-RA, BR
Mon, Dec 18 Light Rain, Mist0.07 in-RA, BR
Tue, Dec 19 Rain, Light Rain, Mist0.61 inRA, -RA, BR
Wed, Dec 20 Light Rain, Mist0.01 in-RA, BR
Thu, Dec 21 MistBR
Fri, Dec 22 Light Rain, Mist0.44 in-RA, BR
Sat, Dec 23 Light Snow, Light Rain, Mist, Unknown Precipitation0.04 in-SN, -RA, BR, UP
Sun, Dec 24 Snow, Light Snow, Light Freezing Rain, Haze, Freezing Fog, Mist0.09 inSN, -SN, -FZRA, HZ, FZFG, BR
Mon, Dec 25 Light Freezing Rain, Mist0.05 in-FZRA, BR
Tue, Dec 26 Light Freezing Rain, Mist0.00 in-FZRA, BR
Wed, Dec 27 Light Freezing Rain, Light Rain, Mist, Unknown Precipitation0.01 in-FZRA, -RA, BR, UP
Thu, Dec 28 Rain, Light Rain, Haze, Mist0.66 inRA, -RA, HZ, BR
Fri, Dec 29 Rain, Light Rain, Mist0.51 inRA, -RA, BR
Sat, Dec 30 Mist0.00 inBR

Hours of Daylight and Twilight in December 2017 at Portland–Troutdale 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 2017 at Portland–Troutdale Airport

Sunrise & Sunset with Twilight in December 2017 at Portland–Troutdale 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 AMNovJan7:29 AM7:29 AMDec 14:27 PMDec 14:27 PM7:49 AM7:49 AMDec 314:35 PMDec 314:35 PM7:39 AM7:39 AMDec 104:25 PMDec 104:25 PM7:46 AM7:46 AMDec 214:28 PMDec 214:28 PM
The solar day over the course of December 2017. 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 2017 at Portland–Troutdale Airport

Solar Elevation and Azimuth in December 2017 at Portland–Troutdale 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 AMNovJan00101020200010102020
northeastsouthwest
Solar elevation and azimuth over the course of December 2017. 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 2017 at Portland–Troutdale Airport

Moon Rise, Set & Phases in December 2017 at Portland–Troutdale Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNovJanDec 37:48 AMDec 37:48 AMDec 1710:31 PMDec 1710:31 PMJan 16:25 PMJan 16:25 PM4:17 PM4:17 PM7:16 AM7:16 AM6:57 AM6:57 AM4:31 PM4:31 PM4:40 PM4:40 PM8:13 AM8:13 AM
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 2017IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
97%-4:44 AMWNW3:37 PMENE10:45 PMS224,719 mi
2
100%-6:00 AMWNW4:17 PMENE11:43 PMS222,800 mi
3
100%-7:16 AMWNW5:05 PMENE--
4
99%-8:28 AMWNW6:01 PMENE12:45 AMS222,136 mi
5
96%-9:34 AMWNW7:05 PMENE1:47 AMS222,780 mi
6
89%-10:30 AMWNW8:14 PMENE2:49 AMS224,614 mi
7
80%-11:16 AMWNW9:25 PMENE3:48 AMS227,381 mi
8
70%-11:55 AMWNW10:36 PMENE4:44 AMS230,751 mi
9
50%-12:29 PMWNW11:45 PME5:35 AMS234,387 mi
10
47%-12:58 PMW-6:24 AMS237,999 mi
11
37%12:51 AME1:26 PMW-7:10 AMS241,367 mi
12
27%1:56 AME1:52 PMW-7:55 AMS244,351 mi
13
18%2:59 AME2:19 PMWSW-8:40 AMS246,878 mi
14
11%4:01 AMESE2:47 PMWSW-9:24 AMS248,924 mi
15
6%5:01 AMESE3:18 PMWSW-10:10 AMS250,502 mi
16
2%6:00 AMESE3:52 PMWSW-10:57 AMS251,635 mi
17
0%6:57 AMESE4:31 PMWSW-11:44 AMS252,345 mi
18
0%7:50 AMESE5:15 PMWSW-12:33 PMS252,640 mi
19
2%8:39 AMESE6:04 PMWSW-1:22 PMS252,506 mi
20
6%9:23 AMESE6:57 PMWSW-2:10 PMS251,909 mi
21
12%10:02 AMESE7:54 PMWSW-2:58 PMS250,800 mi
22
19%10:37 AMESE8:53 PMWSW-3:45 PMS249,132 mi
23
27%11:08 AMESE9:54 PMWSW-4:31 PMS246,877 mi
24
37%11:37 AMESE10:57 PMW-5:16 PMS244,040 mi
25
47%12:05 PME--6:02 PMS240,682 mi
26
50%-12:02 AMW12:32 PME6:49 PMS236,931 mi
27
69%-1:09 AMW1:01 PME7:37 PMS232,996 mi
28
79%-2:19 AMW1:32 PMENE8:29 PMS229,165 mi
29
88%-3:32 AMWNW2:08 PMENE9:23 PMS225,786 mi
30
95%-4:46 AMWNW2:50 PMENE10:22 PMS223,222 mi
31
99%-6:00 AMWNW3:40 PMENE11:24 PMS221,789 mi

Humidity Comfort Levels in December 2017 at Portland–Troutdale Airport

Humidity Comfort Levels in December 2017 at Portland–Troutdale 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 2017 at Portland–Troutdale Airport

Wind Speed in December 2017 at Portland–Troutdale 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 2017 at Portland–Troutdale Airport

Hourly Wind Speed in December 2017 at Portland–Troutdale 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 2017 at Portland–Troutdale Airport

Hourly Wind Direction in 2017 at Portland–Troutdale 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 2017 at Portland–Troutdale Airport

Atmospheric Pressure in December 2017 at Portland–Troutdale Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313129.6 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 2017 at Portland–Troutdale Airport Winter 2017

Number of Reports by Day in December 2017 at Portland–Troutdale Airport181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131002020404060608080100100NovJan
regularspecialcorrection
The number of reports per day.

Reports by Hour in December 2017 at Portland–Troutdale Airport Winter 2017

Reports by Hour in December 2017 at Portland–Troutdale 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 Portland–Troutdale Airport in December 2017.

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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