Corvallis weather in December

In December, Corvallis sees average daytime highs of 46°F and overnight lows near 35°F, with 8.1 in of precipitation across 17.2 wet days and about 8.7 hours of daylight. It is the 12th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 46°F through the month. The sky is clear or mostly clear about 11% of the time in December, and the air most often feels dry.

Daylight stretches from about 8 h 54 min at the start of December to 8 h 42 min by month's end. Set against the rest of the year, December is Corvallis's 12th-clearest and 1st-windiest month. For the whole year in context, see Corvallis's year-round climate.

Daytime high
46°
12th warmest
Overnight low
35°
1st coldest
Precipitation
8.1 in
17.2 wet days
Daylight
8 h 42 min
7:50 AM – 4:29 PM
Cloud cover
78%
12th clearest
Wind
5 mph
1st windiest
Solar energy
1.12 kWh/m²
Travel score
1.0
out of 10

Corvallis is city in and county seat of Benton County, Oregon, United States.

Density
1,506/km²
people per km²
Founded
1845

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 46°F through the month.

A typical December day in Corvallis reaches about 46°F in the afternoon and slips back to 35°F overnight — a 11°F spread between the day's warmth and the night's chill. On most days the high lands between 39°F and 53°F. Set against its neighbours, December runs about 6°F cooler than November and on par with January.

20°30°40°50°60°151015202531
Avg high (°F)Avg low (°F)
14736
24736
34736
44736
54736
64735
74635
84635
94635
104635
114635
124635
134635
144635
154635
164635
174635
184635
194635
204635
214635
224635
234635
244635
254635
264635
274635
284635
294635
304635
314635

How December really feels in Corvallis

Once humidity and wind are folded in, December averages 0 days that feel above 90°F and 31 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
31
wind chill below the day's low

The story in December is cold — wind chill drags the overnight "feels like" below the raw low.

Corvallis weather by month

How December compares with the rest of the year at a glance. December is the 12th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan47° / 36°6.916.91.791.3
Feb50° / 36°5.314.71.410.12.0
Mar55° / 38°6.016.80.911.62.8
Apr59° / 41°4.415.20.113.23.9
May66° / 46°2.810.3014.65.9
Jun72° / 50°1.46.3015.37.3
Jul81° / 55°0.31.80158.0
Aug82° / 55°0.42.2013.97.8
Sep76° / 51°1.44.6012.38.0
Oct64° / 44°3.810.7010.75.6
Nov52° / 39°6.816.50.29.42.3
Dec46° / 35°8.117.21.38.71.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 11% of the time in December, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 10% of December, with mostly cloudy or overcast conditions the remaining 79%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12575
22575
32476
42476
52476
62278
72278
82278
92080
102080
112080
121981
131981
141981
151882
161882
171882
181882
191882
201981
212080
222080
232179
242179
252179
262278
272278
282278
292278
302179
312179

Chance of precipitation in December

Any precipitationSnow

Corvallis gets around 8.1 in of rain and snow over 17.2 wet days in December, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 56% and peaks near 58% on the wettest days, and about 1 day brings snow.

0%20%40%60%151015202531
Rain chance (%)Snow chance (%)
1562
2563
3563
4563
5573
6573
7573
8573
9574
10574
11574
12584
13584
14584
15585
16585
17575
18575
19575
20565
21565
22555
23555
24545
25545
26545
27546
28546
29546
30546
31546

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100
31100

Wind in December

Winds average 5 mph in December, the windiest month of the year.

Across December, daily wind ranges from about 5 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 8 h 54 min at the start of December to 8 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over December. Sunrise moves from 7:36 AM to 7:56 AM, and sunset from 4:29 PM to 4:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
18.97:364:29
28.97:374:29
38.87:384:29
48.87:394:29
58.87:404:28
68.87:414:28
78.87:424:28
88.77:434:28
98.77:444:28
108.77:454:28
118.77:464:28
128.77:474:28
138.77:484:28
148.77:484:28
158.77:494:29
168.77:504:29
178.67:504:29
188.67:514:29
198.67:524:30
208.67:524:30
218.67:534:30
228.67:534:31
238.67:544:31
248.67:544:32
258.67:544:32
268.67:554:33
278.67:554:34
288.77:554:34
298.77:564:35
308.77:564:36
318.77:564:37

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.12 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.12 kWh/m² to a high of 7.2 kWh/m² in July across the year — December's 1.12 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
11.2Dim
21.2Dim
31.2Dim
41.2Dim
51.1Dim
61.1Dim
71.1Dim
81.1Dim
91.1Dim
101.1Dim
111.1Dim
121.1Dim
131.1Dim
141.1Dim
151.1Dim
161.1Dim
171.1Dim
181.1Dim
191.1Dim
201.1Dim
211.1Dim
221.1Dim
231.1Dim
241.1Dim
251.1Dim
261.1Dim
271.1Dim
281.1Dim
291.2Dim
301.2Dim
311.2Dim
Planning a trip in December

Hazard calendar for Corvallis

In seasonPeak

In December, Corvallis sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Corvallis's rainy season runs October–April, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit Corvallis?

Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

1.0
Sightseeing
12th-best month of the year
0.0
Beach & pool
9th-best month of the year

December is a weaker month for outdoor sightseeing in Corvallis.

What to pack for Corvallis in December

From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In December, Corvallis sees daytime highs around 46°F and nights near 35°F. Pack a warm layer and rain gear. Worth having: a heavy coat. About 17 days see rain.

a warm layerrain geara heavy coat

Sea temperature near Corvallis in December

The nearest coast averages about 51°F in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 43 mi away) is warmest in July at about 56°F and coldest in February near 50°F.

The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.

48°50°52°54°56°58°JanFebMarAprMayJunJulAugSepOctNovDecbracing
Sea temperature (°F)Comfort
Jan50Bracing
Feb50Bracing
Mar50Bracing
Apr51Bracing
May54Bracing
Jun56Bracing
Jul56Bracing
Aug56Bracing
Sep56Bracing
Oct55Bracing
Nov53Bracing
Dec51Bracing

UV index in Corvallis in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 1. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Corvallis peaks around July 16 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 16UV 8Dec 18UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5High
May8Very high
Jun7Very high
Jul8Very high
Aug7Very high
Sep5Moderate
Oct4Moderate
Nov1Low
Dec1Low

Air quality in Corvallis in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.

Air quality in Corvallis is worst in September — around 40 µg/m³ PM2.5 (poor), about 7.1× the cleanest month (January, 6 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodSep 1537 µg/m³Jan 186 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb8Good
Mar10Good
Apr11Good
May11Good
Jun8Good
Jul8Good
Aug16Moderate
Sep40Poor
Oct11Good
Nov11Good
Dec9Good
Location & terrain

Where is Corvallis?

Corvallis sits at 44.6°N, 123.3°W, 233 ft above sea level, in United States. The nearest listed city is Albany, 9.3 mi away.

Topography around Corvallis

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Corvallis.

Within 2 miles, the terrain around Corvallis has only modest variations in elevation — a maximum elevation change of 262 ft around an average of 233 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,014 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,997 ft.

The land around Corvallis is covered by trees (42%) and artificial surfaces (26%) within 2 miles, trees (47%) and cropland (31%) within 10 miles, and trees (70%) within 50 miles.

2 miles
262 ft
10 miles
2,014 ft
50 miles
4,997 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Albany 9.3 mi · Lebanon 17 mi · Dallas 25 mi · Salem 29 mi · Four Corners 29 mi · Keizer 32 mi · Hayesville 32 mi · Eugene 37 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Corvallis (44.5646°, -123.262°, elevation 233 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).