Smyrna weather in December

In December, Smyrna sees average daytime highs of 54°F and overnight lows near 37°F, with 4.5 in of precipitation across 10.2 wet days and about 9.8 hours of daylight. It is the 11th-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 57°F in the first days to 52°F by the end. The sky is clear or mostly clear about 33% 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 48 min by month's end. Set against the rest of the year, December is Smyrna's 10th-clearest and 4th-windiest month. For the whole year in context, see Smyrna's year-round climate.

Daytime high
54°
11th warmest
Overnight low
37°
2nd coldest
Precipitation
4.5 in
10.2 wet days
Daylight
9 h 48 min
7:42 AM – 5:27 PM
Cloud cover
60%
10th clearest
Wind
7 mph
4th windiest
Solar energy
2.28 kWh/m²
Travel score
3.3
out of 10

Smyrna is city in Cobb County, Georgia, United States.

Density
1,386/km²
people per km²
Founded
1832

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 57°F in the first days to 52°F by the end.

A typical December day in Smyrna reaches about 54°F in the afternoon and slips back to 37°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 42°F and 66°F. Set against its neighbours, December runs about 8°F cooler than November and about 2°F warmer than January.

20°40°60°80°151015202531
Avg high (°F)Avg low (°F)
15839
25739
35739
45738
55638
65638
75638
85538
95538
105538
115537
125437
135437
145437
155437
165437
175337
185337
195336
205336
215336
225336
235336
245336
255236
265236
275236
285236
295236
305236
315236

How December really feels in Smyrna

Once humidity and wind are folded in, December averages 0 days that feel above 90°F and 23 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
23
wind chill below the day's low

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

Smyrna weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan52° / 34°4.510.40.7102.7
Feb56° / 37°4.5100.510.73.7
Mar64° / 44°4.710.30.111.75.6
Apr72° / 51°4.09.6012.86.7
May79° / 60°3.410.2013.76.6
Jun85° / 68°4.013.6014.24.8
Jul88° / 71°4.214.50144.1
Aug87° / 70°3.912.6013.34.5
Sep82° / 64°3.68.6012.26.4
Oct72° / 53°3.37.1011.17.3
Nov62° / 42°3.98.2010.25.7
Dec54° / 37°4.510.20.39.83.3

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 33% 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 57%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14852
24852
34654
44654
54555
64555
74555
84456
94456
104357
114357
124357
134357
144357
154357
164456
174357
184357
194357
204357
214357
224357
234258
244159
254159
264159
274060
284060
294060
304060
314159

Chance of precipitation in December

Any precipitationSnow

Smyrna gets around 4.5 in of rain and snow over 10.2 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 33% and peaks near 35% on the wettest days, and about 0 day brings snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
1300
2300
3311
4311
5311
6311
7311
8311
9321
10321
11321
12321
13331
14331
15341
16341
17341
18351
19351
20351
21351
22351
23351
24351
25351
26351
27352
28342
29342
30342
31342

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 92% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
192620
292620
392620
492620
592620
692620
792620
892620
992620
1093610
1193610
1293610
1393610
1493610
1593610
1693610
1794510
1894510
1993520
2093520
2193520
2293421
2393421
2493421
2592521
2692521
2792521
2892521
2992521
3092521
3192521

Wind in December

Winds average 7 mph in December.

Across December, daily wind ranges from about 7 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97light breeze
107light breeze
117light 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 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 7:31 AM to 7:48 AM, and sunset from 5:25 PM to 5:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.97:315:25
29.97:315:25
39.97:325:25
49.97:335:25
59.97:345:25
69.87:355:25
79.87:355:25
89.87:365:25
99.87:375:25
109.87:385:25
119.87:385:26
129.87:395:26
139.87:405:26
149.87:405:26
159.87:415:27
169.87:425:27
179.87:425:27
189.77:435:28
199.77:435:28
209.77:445:28
219.77:445:29
229.77:455:29
239.77:455:30
249.77:465:30
259.77:465:31
269.77:465:31
279.87:475:32
289.87:475:33
299.87:475:33
309.87:485:34
319.87:485:34

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.28 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.28 kWh/m² to a high of 6.04 kWh/m² in May across the year — December's 2.28 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.5Moderate
22.5Moderate
32.5Moderate
42.4Moderate
52.4Moderate
62.4Moderate
72.4Moderate
82.4Moderate
92.3Moderate
102.3Moderate
112.3Moderate
122.3Moderate
132.3Moderate
142.3Moderate
152.3Moderate
162.2Moderate
172.2Moderate
182.2Moderate
192.2Moderate
202.2Moderate
212.2Moderate
222.2Moderate
232.2Moderate
242.2Moderate
252.2Moderate
262.2Moderate
272.2Moderate
282.2Moderate
292.2Moderate
302.3Moderate
312.3Moderate
Planning a trip in December

Is December a good time to visit Smyrna?

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

3.3
Sightseeing
11th-best month of the year
0.0
Beach & pool
11th-best month of the year

December is a weaker month for outdoor sightseeing in Smyrna.

What to pack for Smyrna in December

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

In December, Smyrna sees daytime highs around 54°F and nights near 37°F. Worth packing: a warm layer and rain gear. About 10 days see rain.

a warm layerrain gear

UV index in Smyrna 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 Smyrna peaks around July 10 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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 highHighModerateJul 10UV 10Dec 20UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar6High
Apr7High
May8Very high
Jun10Very high
Jul10Very high
Aug8Very high
Sep7Very high
Oct5High
Nov4Moderate
Dec3Moderate

Air quality in Smyrna 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 Smyrna is worst in July — around 21 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (January, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodJul 1620 µg/m³Jan 118 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb10Good
Mar12Moderate
Apr12Good
May14Moderate
Jun17Moderate
Jul21Moderate
Aug17Moderate
Sep13Moderate
Oct10Good
Nov9Good
Dec8Good
Location & terrain

Where is Smyrna?

Smyrna sits at 33.9°N, 84.5°W, 1,060 ft above sea level, in United States. The nearest listed city is Marietta, 5.0 mi away.

Topography around Smyrna

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

Within 2 miles, the terrain around Smyrna has only modest variations in elevation — a maximum elevation change of 213 ft around an average of 1,024 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,073 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,789 ft.

The land around Smyrna is covered by trees (62%) and artificial surfaces (29%) within 2 miles, trees (70%) and artificial surfaces (23%) within 10 miles, and trees (81%) within 50 miles.

2 miles
213 ft
10 miles
1,073 ft
50 miles
2,789 ft
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Marietta 5.0 mi · Mableton 6.2 mi · Sandy Springs 8.1 mi · Brookhaven 9.9 mi · Lithia Springs 11 mi · Dunwoody 11 mi · Kennesaw 11 mi · Atlanta 12 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 Smyrna (33.884°, -84.5144°, elevation 1,060 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).