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December 2025 Weather History at Portland International Airport Oregon, United States

This report shows the past weather for Portland International Airport, providing a weather history for December 2025. It features all historical weather data series we have available, including the Portland International Airport temperature history for December 2025. You can drill down from year to month and even day level reports by clicking on the graphs.

Portland International Airport Temperature History December 2025

History:JFMAMJJASONDec2024202320222021
Temperature history in December 2025 at Portland International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313125°F25°F30°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°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 2025 at Portland International Airport

History:JFMAMJJASONDec2024202320222021
Hourly Temperature in December 2025 at Portland International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMNovJanvery 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 2025 at Portland International Airport

History:JFMAMJJASONDec2024202320222021
Cloud Cover in December 2025 at Portland 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.
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Daily Precipitation in December 2025 at Portland International Airport

History:JFMAMJJASONDec2024202320222021
Daily Precipitation in December 2025 at Portland 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.

Observed Weather in December 2025 at Portland International Airport

History:JFMAMJJASONDec2024202320222021
Observed Weather in December 2025 at Portland 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
Mon, Dec 1 Light Rain, Fog, Mist0.00 in-RA, FG, BR
Tue, Dec 2 Light Rain, Mist, Shallow Fog0.00 in-RA, BR, MIFG
Wed, Dec 3 Fog, Mist, Shallow FogFG, BR, MIFG
Thu, Dec 4 Heavy Rain, Rain, Light Rain, Mist0.83 in+RA, RA, -RA, BR
Fri, Dec 5 Rain, Light Rain, Mist0.62 inRA, -RA, BR
Sat, Dec 6 Light Rain, Mist0.02 in-RA, BR
Sun, Dec 7 Light Rain, Light Drizzle, Mist0.17 in-RA, -DZ, BR
Mon, Dec 8 Rain, Light Rain, Light Drizzle, Mist1.40 inRA, -RA, -DZ, BR
Tue, Dec 9 Heavy Rain, Rain, Light Rain, Mist1.68 in+RA, RA, -RA, BR
Wed, Dec 10 Light Rain0.01 in-RA
Thu, Dec 11 Light Rain, Light Drizzle0.00 in-RA, -DZ
Fri, Dec 12 Light Drizzle, Mist0.00 in-DZ, BR
Sat, Dec 13 MistBR
Sun, Dec 14 Light Rain, Fog, Mist0.03 in-RA, FG, BR
Mon, Dec 15 Heavy Rain, Rain, Light Rain, Mist0.72 in+RA, RA, -RA, BR
Tue, Dec 16 Light Rain, Light Drizzle, Mist0.22 in-RA, -DZ, BR
Wed, Dec 17 Light Rain0.07 in-RA
Thu, Dec 18 Heavy Rain, Rain, Light Rain, Mist2.10 in+RA, RA, -RA, BR
Fri, Dec 19 Light Rain0.02 in-RA
Sat, Dec 20 Light Rain0.01 in-RA
Sun, Dec 21 Rain, Light Rain, Mist0.20 inRA, -RA, BR
Mon, Dec 22 Light Rain, Shallow Fog0.19 in-RA, MIFG
Tue, Dec 23 Light Rain0.00 in-RA
Wed, Dec 24 Light Rain, Fog, Mist, Patches of Fog0.03 in-RA, FG, BR, BCFG
Thu, Dec 25 Light Rain, Fog, Patches of Fog0.07 in-RA, FG, BCFG
Fri, Dec 26 Light Rain, Mist0.07 in-RA, BR
Sat, Dec 27 Light Rain0.03 in-RA
Sun, Dec 28 MistBR
Mon, Dec 29 Fog, Mist, Patches of FogFG, BR, BCFG
Tue, Dec 30 Freezing Fog, Mist, Patches of FogFZFG, BR, BCFG

Hours of Daylight and Twilight in December 2025 at Portland International Airport

History:JFMAMJJASONDec2024202320222021
Hours of Daylight and Twilight in December 2025 at Portland International Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrNovJanDec 218 hr, 42 minDec 218 hr, 42 minnightnightdaydayDec 18 hr, 57 minDec 18 hr, 57 minDec 318 hr, 46 minDec 318 hr, 46 minDec 118 hr, 46 minDec 118 hr, 46 min
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 2025 at Portland International Airport

History:JFMAMJJASONDec2024202320222021
Sunrise & Sunset with Twilight in December 2025 at Portland 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 AMNovJan7:30 AM7:30 AMDec 14:28 PMDec 14:28 PM7:50 AM7:50 AMDec 314:36 PMDec 314:36 PM7:39 AM7:39 AMDec 94:26 PMDec 94:26 PM7:47 AM7:47 AMDec 214:29 PMDec 214:29 PM
The solar day over the course of December 2025. 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 2025 at Portland International Airport

History:JFMAMJJASONDec2024202320222021
Solar Elevation and Azimuth in December 2025 at Portland 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 AMNovJan00101020200010102020
northeastsouthwest
Solar elevation and azimuth over the course of December 2025. 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 2025 at Portland International Airport

History:JFMAMJJASONDec2024202320222021
Moon Rise, Set & Phases in December 2025 at Portland International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNovJanDec 43:15 PMDec 43:15 PMDec 195:44 PMDec 195:44 PMJan 32:04 AMJan 32:04 AM3:52 PM3:52 PM8:58 AM8:58 AM7:59 AM7:59 AM3:50 PM3:50 PM3:39 PM3:39 PM8:35 AM8:35 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 2025IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
89%-3:22 AMWNW2:04 PMENE9:19 PMS224,738 mi
2
96%-4:46 AMWNW2:30 PMENE10:15 PMS222,689 mi
3
99%-6:14 AMWNW3:05 PMNE11:17 PMS221,824 mi
4
100%-7:40 AMNW3:52 PMNE--
5
100%-8:58 AMNW4:54 PMNE12:22 AMS222,293 mi
6
97%-10:01 AMNW6:09 PMNE1:29 AMS224,069 mi
7
91%-10:47 AMNW7:30 PMNE2:33 AMS226,949 mi
8
83%-11:20 AMWNW8:50 PMENE3:31 AMS230,604 mi
9
74%-11:45 AMWNW10:07 PMENE4:23 AMS234,653 mi
10
64%-12:05 PMWNW11:18 PME5:10 AMS238,733 mi
11
50%-12:23 PMW-5:54 AMS242,543 mi
12
43%12:26 AME12:39 PMW-6:35 AMS245,860 mi
13
33%1:32 AME12:55 PMWSW-7:15 AMS248,541 mi
14
24%2:38 AMESE1:12 PMWSW-7:56 AMS250,521 mi
15
16%3:44 AMESE1:31 PMWSW-8:38 AMS251,794 mi
16
10%4:50 AMESE1:55 PMWSW-9:23 AMS252,401 mi
17
5%5:57 AMSE2:25 PMSW-10:11 AMS252,413 mi
18
1%7:01 AMSE3:03 PMSW-11:02 AMS251,915 mi
19
0%7:59 AMSE3:50 PMSW-11:55 AMS250,989 mi
20
1%8:50 AMSE4:48 PMSW-12:49 PMS249,702 mi
21
3%9:31 AMSE5:53 PMSW-1:42 PMS248,101 mi
22
8%10:03 AMSE7:02 PMWSW-2:33 PMS246,208 mi
23
14%10:29 AMESE8:13 PMWSW-3:21 PMS244,031 mi
24
22%10:51 AMESE9:25 PMWSW-4:07 PMS241,576 mi
25
32%11:10 AMESE10:36 PMW-4:52 PMS238,865 mi
26
42%11:28 AME11:48 PMW-5:36 PMS235,953 mi
27
50%11:46 AME--6:21 PMS232,946 mi
28
65%-1:03 AMWNW12:05 PMENE7:08 PMS230,016 mi
29
76%-2:22 AMWNW12:28 PMENE8:00 PMS227,390 mi
30
86%-3:44 AMWNW12:57 PMENE8:57 PMS225,339 mi
31
93%-5:09 AMNW1:37 PMNE9:59 PMS224,134 mi

Humidity Comfort Levels in December 2025 at Portland International Airport

History:JFMAMJJASONDec2024202320222021
Humidity Comfort Levels in December 2025 at Portland 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 2025 at Portland International Airport

History:JFMAMJJASONDec2024202320222021
Wind Speed in December 2025 at Portland International Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mph25 mph25 mph30 mph30 mph35 mph35 mph40 mph40 mphNovJan
The daily range of reported wind speeds (gray bars), with maximum gust speeds (red ticks).

Hourly Wind Speed in December 2025 at Portland International Airport

History:JFMAMJJASONDec2024202320222021
Hourly Wind Speed in December 2025 at Portland 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 2025 at Portland International Airport

History:JFMAMJJASONDec2024202320222021
Hourly Wind Direction in 2025 at Portland 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 2025 at Portland International Airport

History:JFMAMJJASONDec2024202320222021
Atmospheric Pressure in December 2025 at Portland 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 inHg30.8 inHg30.8 inHgNovJan
The daily range of atmospheric pressure (gray bars), as measured by the altimeter setting reported in e.g. a METAR report.

Reports by Month

Reports by Month at Portland International Airport19401950196019701980199020002010202019401940194119411942194219431943194419441947194719481948194919491950195019511951195219521953195319541954195519551956195619571957195819581959195919601960196119611962196219631963196419641965196519661966196719671968196819691969197019701971197119721972197319731974197419751975197619761977197719781978197919791980198019811981198219821983198319841984198519851986198619871987198819881989198919901990199119911992199219931993199419941995199519961996199719971998199819991999200020002001200120022002200320032004200420052005200620062007200720082008200920092010201020112011201220122013201320142014201520152016201620172017201820182019201920202020202120212022202220232023202420242025202520262026
METARISDboth
The number of reports per month over the entire history of this station.

Number of Reports by Day in December 2025 at Portland International Airport Winter 2025

Number of Reports by Day in December 2025 at Portland International Airport181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131002424NovJan
regularspecialcorrection
The number of reports per day.

Reports by Hour in December 2025 at Portland International Airport Winter 2025

Reports by Hour in December 2025 at Portland 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 Portland International Airport in December 2025.

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.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

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