Duncan weather in December

In December, Duncan sees average daytime highs of 53°F and overnight lows near 34°F, with 2.0 in of precipitation across 5.2 wet days and about 9.7 hours of daylight. It is the 11th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 56°F in the first days to 51°F by the end. The sky is clear or mostly clear about 48% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 54 min at the start of December to 9 h 42 min by month's end. Set against the rest of the year, December is Duncan's 8th-clearest and 9th-windiest month. For the whole year in context, see Duncan's year-round climate.

Daytime high
53°
11th warmest
Overnight low
34°
2nd coldest
Precipitation
2.0 in
5.2 wet days
Daylight
9 h 42 min
7:37 AM – 5:19 PM
Cloud cover
47%
8th clearest
Wind
8 mph
9th windiest
Solar energy
2.59 kWh/m²
Travel score
3.5
out of 10

Duncan is city and county seat of Stephens County, Oklahoma, United States.

Density
188/km²
people per km²
Founded
1892

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 56°F in the first days to 51°F by the end.

A typical December day in Duncan reaches about 53°F in the afternoon and slips back to 34°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 38°F and 66°F. Set against its neighbours, December runs about 10°F cooler than November and on par with January.

20°40°60°80°151015202531
Avg high (°F)Avg low (°F)
15737
25637
35636
45636
55536
65536
75535
85435
95435
105435
115335
125334
135334
145334
155334
165334
175234
185233
195233
205233
215233
225133
235133
245133
255133
265133
275133
285133
295132
305132
315132

How December really feels in Duncan

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.

Duncan weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan52° / 32°1.54.80.9103.2
Feb56° / 36°1.85.80.910.74.4
Mar65° / 44°3.17.60.411.76.4
Apr73° / 52°3.67.9012.87.3
May81° / 62°4.710.6013.86.3
Jun89° / 70°3.68.6014.34.4
Jul94° / 74°1.85.8014.13.2
Aug93° / 73°1.95.6013.33.4
Sep85° / 65°2.86.4012.25.8
Oct74° / 54°3.56.8011.17.6
Nov62° / 42°2.15.50.210.26.2
Dec53° / 34°2.05.20.89.73.5

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 48% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 10% of December, with mostly cloudy or overcast conditions the remaining 41%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16238
26238
36238
46139
56139
66040
76040
86040
96040
106040
116040
125941
135941
145941
155842
165842
175842
185842
195743
205743
215842
225743
235743
245743
255743
265842
275842
285842
295842
305842
315941

Chance of precipitation in December

Any precipitationSnow

Duncan gets around 2.0 in of rain and snow over 5.2 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 17% and peaks near 18% on the wettest days, and about 1 day brings snow.

0%10%20%30%151015202531
Rain chance (%)Snow chance (%)
1182
2182
3182
4182
5182
6182
7182
8182
9182
10182
11182
12172
13172
14172
15172
16162
17162
18162
19152
20152
21153
22153
23153
24153
25153
26153
27163
28163
29163
30163
31163

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 98% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19721
29721
39721
49721
59811
69811
79811
89811
99910
109910
119910
129910
139910
149910
159910
169910
179910
189910
199910
209910
219910
229910
239910
249910
259820
269820
279820
289820
299820
309820
319820

Wind in December

Winds average 8 mph in December.

Across December, daily wind ranges from about 8 mph on the calmest days to 9 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
19light breeze
29light breeze
39light breeze
49light breeze
59light breeze
68light breeze
78light breeze
88light breeze
98light breeze
108light breeze
118light breeze
128light breeze
138light breeze
148light breeze
158light breeze
168light breeze
178light breeze
188light breeze
198light breeze
208light breeze
218light breeze
228light breeze
238light breeze
248light breeze
258light breeze
268light breeze
278light breeze
288light breeze
298light breeze
308light breeze
318light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 54 min at the start of December to 9 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 7:26 AM to 7:43 AM, and sunset from 5:17 PM to 5:27 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.97:265:17
29.87:275:17
39.87:285:17
49.87:285:17
59.87:295:17
69.87:305:17
79.87:315:17
89.87:315:17
99.87:325:17
109.77:335:18
119.77:345:18
129.77:345:18
139.77:355:18
149.77:365:18
159.77:365:19
169.77:375:19
179.77:385:19
189.77:385:20
199.77:395:20
209.77:395:21
219.77:405:21
229.77:405:21
239.77:415:22
249.77:415:22
259.77:415:23
269.77:425:24
279.77:425:24
289.77:435:25
299.77:435:25
309.77:435:26
319.77:435:27

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.59 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.59 kWh/m² to a high of 6.94 kWh/m² in July across the year — December's 2.59 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.7Moderate
22.7Moderate
32.7Moderate
42.7Moderate
52.7Moderate
62.7Moderate
72.6Moderate
82.6Moderate
92.6Moderate
102.6Moderate
112.6Moderate
122.6Moderate
132.6Moderate
142.6Moderate
152.6Moderate
162.5Moderate
172.5Moderate
182.5Moderate
192.5Moderate
202.5Moderate
212.5Moderate
222.6Moderate
232.6Moderate
242.6Moderate
252.6Moderate
262.6Moderate
272.6Moderate
282.6Moderate
292.6Moderate
302.6Moderate
312.6Moderate
Planning a trip in December

Is December a good time to visit Duncan?

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

3.5
Sightseeing
9th-best month of the year
0.0
Beach & pool
11th-best month of the year

December is a weaker month for outdoor sightseeing in Duncan.

What to pack for Duncan in December

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

In December, Duncan sees daytime highs around 53°F and nights near 34°F. Pack a warm layer. About 5 days see rain.

a warm layer

UV index in Duncan in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 3. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Duncan peaks around June 23 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJun 23UV 10Dec 21UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar6High
Apr9Very high
May9Very high
Jun10Extreme
Jul10Extreme
Aug10Very high
Sep7Very high
Oct6High
Nov4Moderate
Dec3Moderate
Location & terrain

Where is Duncan?

Duncan sits at 34.5°N, 98.0°W, 1,122 ft above sea level, in United States. The nearest listed city is Lawton, 25 mi away.

Topography around Duncan

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

Within 2 miles, the terrain around Duncan has only modest variations in elevation — a maximum elevation change of 167 ft around an average of 1,125 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 367 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,716 ft.

The land around Duncan is covered by grassland (39%), trees (29%) and artificial surfaces (27%) within 2 miles, grassland (64%) and trees (25%) within 10 miles, and grassland (66%) within 50 miles.

2 miles
167 ft
10 miles
367 ft
50 miles
1,716 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Lawton 25 mi · Chickasha 38 mi · Wichita Falls 51 mi · Ardmore 52 mi · Norman 58 mi · Mustang 62 mi · Moore 64 mi · Yukon 70 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 Duncan (34.5023°, -97.9578°, elevation 1,122 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).