Altamont weather in December

In December, Altamont sees average daytime highs of 38°F and overnight lows near 26°F, with 3.9 in of precipitation across 12.4 wet days and about 9 hours of daylight. It is the 12th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 40°F in the first days to 37°F by the end. The sky is clear or mostly clear about 22% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 06 min at the start of December to 9 hours by month's end. Set against the rest of the year, December is Altamont's 12th-clearest and 9th-windiest month. For the whole year in context, see Altamont's year-round climate.

Daytime high
38°
12th warmest
Overnight low
26°
2nd coldest
Precipitation
3.9 in
12.4 wet days
Daylight
8 h 54 min
7:35 AM – 4:31 PM
Cloud cover
69%
12th clearest
Wind
5 mph
9th windiest
Solar energy
1.73 kWh/m²
Travel score
0.0
out of 10

Altamont is unincorporated community in Klamath County, Oregon, United States.

Density
918/km²
people per km²

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 40°F in the first days to 37°F by the end.

A typical December day in Altamont reaches about 38°F in the afternoon and slips back to 26°F overnight — a 12°F spread between the day's warmth and the night's chill. On most days the high lands between 31°F and 45°F. Set against its neighbours, December runs about 8°F cooler than November and on par with January.

20°30°40°50°151015202531
Avg high (°F)Avg low (°F)
14028
24028
34028
44028
54028
63928
73928
83927
93927
103827
113827
123827
133826
143826
153826
163826
173726
183726
193726
203725
213725
223725
233725
243725
253725
263725
273725
283725
293725
303725
313725

How December really feels in Altamont

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.

Altamont 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
Jan39° / 26°3.211.89.59.30.0
Feb43° / 27°2.5108.410.30.4
Mar48° / 30°2.812.1811.61.8
Apr55° / 34°2.010.14.513.13.5
May65° / 41°1.78.31.114.46.2
Jun74° / 47°0.94.70.1157.9
Jul84° / 55°0.32.1014.87.1
Aug83° / 55°0.41.8013.77.4
Sep76° / 48°0.52.6012.38.6
Oct62° / 40°1.45.7110.86.1
Nov47° / 32°2.79.75.59.61.4
Dec38° / 26°3.912.410.490.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% 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 68%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13367
23367
33367
43268
53169
63070
73070
83070
93169
103169
113070
123070
133070
143169
153169
163169
173169
183367
193367
203367
213367
223367
233367
243367
253367
263367
273367
283367
293367
303268
313268

Chance of precipitation in December

Any precipitationSnow

Altamont gets around 3.9 in of rain and snow over 12.4 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 40% and peaks near 42% on the wettest days, and about 10 days bring snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
13827
23927
33928
44028
54029
64130
74131
84132
94232
104233
114234
124234
134235
144235
154236
164136
174136
184136
194036
204036
214036
223935
233935
243935
253935
263935
273934
283934
293934
303934
313935

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.

Across December, daily wind ranges from about 4 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
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 06 min at the start of December to 9 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 7:22 AM to 7:41 AM, and sunset from 4:31 PM to 4:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.17:224:31
29.17:234:31
39.17:244:31
49.17:254:30
59.17:264:30
69.07:274:30
79.07:284:30
89.07:294:30
99.07:304:30
109.07:314:30
119.07:324:30
129.07:324:30
139.07:334:30
148.97:344:31
158.97:344:31
168.97:354:31
178.97:364:31
188.97:364:32
198.97:374:32
208.97:384:32
218.97:384:33
228.97:394:33
238.97:394:34
248.97:394:34
258.97:404:35
268.97:404:35
278.97:404:36
288.97:414:37
298.97:414:37
308.97:414:38
319.07:414:39

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.73 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.73 kWh/m² to a high of 8.03 kWh/m² in July across the year — December's 1.73 kWh/m² sits near the bottom.

00.511.522.5151015202531
Solar energy (kWh/m²)Level
11.8Dim
21.8Dim
31.8Dim
41.7Dim
51.7Dim
61.7Dim
71.7Dim
81.7Dim
91.7Dim
101.7Dim
111.7Dim
121.7Dim
131.7Dim
141.7Dim
151.7Dim
161.7Dim
171.7Dim
181.7Dim
191.7Dim
201.7Dim
211.7Dim
221.7Dim
231.7Dim
241.8Dim
251.8Dim
261.8Dim
271.8Dim
281.8Dim
291.8Dim
301.8Dim
311.8Dim
Planning a trip in December

Hazard calendar for Altamont

In seasonPeak

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

Altamont's rainy season runs November–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 Altamont?

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

0.0
Sightseeing
11th-best month of the year
0.0
Beach & pool
9th-best month of the year

December is a weaker month for outdoor sightseeing in Altamont.

What to pack for Altamont in December

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

In December, Altamont sees daytime highs around 38°F and nights near 26°F. Pack a warm layer. Worth having: a heavy coat and rain gear. About 12 days see rain.

a warm layera heavy coatrain gear

UV index in Altamont in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Altamont peaks around July 11 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 12 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJul 11UV 10Dec 12UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar5High
Apr6High
May9Very high
Jun9Very high
Jul10Very high
Aug8Very high
Sep6High
Oct5Moderate
Nov2Low
Dec2Low

Air quality in Altamont 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 Altamont is worst in July — around 40 µg/m³ PM2.5 (poor), about 7.4× the cleanest month (January, 5 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecGoodGoodPoorModerateGoodJul 2139 µg/m³Jan 186 µg/m³
PM2.5 (µg/m³)Level
Jan5Good
Feb8Good
Mar9Good
Apr14Moderate
May9Good
Jun7Good
Jul40Poor
Aug33Moderate
Sep38Poor
Oct10Good
Nov8Good
Dec9Good
Location & terrain

Where is Altamont?

Altamont sits at 42.2°N, 121.7°W, 4,144 ft above sea level, in United States. The nearest listed city is Klamath Falls, 2.5 mi away.

Topography around Altamont

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

Within 2 miles, the terrain around Altamont has significant variations in elevation — a maximum elevation change of 830 ft around an average of 4,177 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,415 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,792 ft.

The land around Altamont is covered by artificial surfaces (42%) and grassland (41%) within 2 miles, grassland (50%) and trees (27%) within 10 miles, and trees (57%) and grassland (36%) within 50 miles.

2 miles
830 ft
10 miles
2,415 ft
50 miles
7,792 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Klamath Falls 2.5 mi · Ashland 50 mi · Medford 59 mi · Central Point 62 mi · Grants Pass 83 mi · Roseburg 107 mi · Redding 117 mi · Bend 130 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 Altamont (42.2068°, -121.7372°, elevation 4,144 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. 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).