Baltimore weather in December

In December, Baltimore sees average daytime highs of 45°F and overnight lows near 35°F, with 4.3 in of precipitation across 9.6 wet days and about 9.3 hours of daylight. It is the 10th-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 48°F in the first days to 43°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 24 min at the start of December to 9 h 18 min by month's end. Set against the rest of the year, December is Baltimore's 6th-clearest and 4th-windiest month. For the whole year in context, see Baltimore's year-round climate.

Daytime high
45°
10th warmest
Overnight low
35°
3rd coldest
Precipitation
4.3 in
9.6 wet days
Daylight
9 h 12 min
7:25 AM – 4:40 PM
Cloud cover
59%
6th clearest
Wind
9 mph
4th windiest
Solar energy
1.9 kWh/m²
Travel score
1.0
out of 10

Baltimore is city in Maryland, United States.

Density
2,457/km²
people per km²
Founded
1729

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 48°F in the first days to 43°F by the end.

A typical December day in Baltimore reaches about 45°F in the afternoon and slips back to 35°F overnight — a 10°F spread between the day's warmth and the night's chill. On most days the high lands between 34°F and 56°F. Set against its neighbours, December runs about 9°F cooler than November and about 5°F warmer than January.

20°40°60°151015202531
Avg high (°F)Avg low (°F)
14938
24938
34838
44837
54737
64737
74736
84636
94636
104636
114635
124535
134535
144535
154535
164434
174434
184434
194434
204434
214433
224433
234433
244333
254333
264333
274333
284333
294332
304232
314232

How December really feels in Baltimore

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.

Baltimore weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan40° / 30°3.692.79.50.0
Feb42° / 31°3.39.13.110.50.4
Mar50° / 37°4.510.52.111.72.2
Apr61° / 47°3.810.40.2134.9
May70° / 57°3.811014.16.3
Jun79° / 67°3.510.9014.76.5
Jul84° / 72°3.811.4014.55.5
Aug82° / 71°3.610.4013.56.1
Sep76° / 64°4.79.4012.37.0
Oct65° / 53°4.08.40116.2
Nov54° / 42°3.48.30.29.83.5
Dec45° / 35°4.39.61.69.31.0

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 15% of December, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15050
25050
35050
44852
54852
64852
74753
84753
94753
104654
114654
124654
134654
144753
154753
164753
174753
184951
194951
204951
214951
225050
235050
245050
255149
265149
275149
285149
295149
305149
315050

Chance of precipitation in December

Any precipitationSnow

Baltimore gets around 4.3 in of rain and snow over 9.6 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 31% and peaks near 33% on the wettest days, and about 2 days bring snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1312
2313
3323
4323
5323
6334
7334
8334
9335
10335
11335
12335
13336
14336
15326
16326
17326
18326
19316
20316
21306
22306
23296
24296
25296
26295
27295
28295
29296
30296
31296

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 99% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
1982
2991
3991
4991
5991
6991
7991
8991
9991
10991
111000
121000
131000
14991
15991
16991
17991
18991
19991
20991
21991
22991
23991
24991
25991
26991
27991
28991
29991
30991
31991

Wind in December

Winds average 9 mph in December.

Across December, daily wind ranges from about 9 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
69light breeze
79light breeze
89light breeze
99light breeze
109light breeze
119light breeze
129light breeze
139light breeze
149light breeze
159light breeze
169light breeze
179light breeze
189light breeze
199light breeze
209light breeze
219light breeze
229light breeze
239light breeze
249light breeze
259light breeze
269light breeze
279light breeze
289light breeze
299light breeze
309light breeze
319light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 24 min at the start of December to 9 h 18 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 7:13 AM to 7:32 AM, and sunset from 4:39 PM to 4:48 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.47:134:39
29.47:144:39
39.47:154:39
49.47:164:39
59.47:174:39
69.47:184:39
79.37:194:39
89.37:194:39
99.37:204:39
109.37:214:39
119.37:224:39
129.37:224:39
139.37:234:39
149.37:244:39
159.37:254:40
169.27:254:40
179.27:264:40
189.27:264:41
199.27:274:41
209.27:284:41
219.27:284:42
229.27:294:42
239.27:294:43
249.27:294:43
259.27:304:44
269.27:304:44
279.27:314:45
289.27:314:46
299.37:314:46
309.37:314:47
319.37:324:48

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.9 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.9 kWh/m² to a high of 6.07 kWh/m² in June across the year — December's 1.9 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.0Moderate
22.0Moderate
32.0Moderate
42.0Dim
52.0Dim
61.9Dim
71.9Dim
81.9Dim
91.9Dim
101.9Dim
111.9Dim
121.9Dim
131.9Dim
141.9Dim
151.9Dim
161.9Dim
171.9Dim
181.9Dim
191.9Dim
201.9Dim
211.9Dim
221.9Dim
231.9Dim
241.9Dim
251.9Dim
261.9Dim
271.9Dim
281.9Dim
291.9Dim
301.9Dim
311.9Dim
Planning a trip in December

Hazard calendar for Baltimore

In seasonPeak

None of Baltimore's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Baltimore sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit Baltimore?

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

1.0
Sightseeing
10th-best month of the year
0.0
Beach & pool
10th-best month of the year

December is a weaker month for outdoor sightseeing in Baltimore.

What to pack for Baltimore in December

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

In December, Baltimore sees daytime highs around 45°F and nights near 35°F. Pack a warm layer. Worth having: a heavy coat and rain gear. About 10 days see rain.

a warm layera heavy coatrain gear

Sea temperature near Baltimore in December

The nearest coast averages about 44°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 17 mi away) is warmest in August at about 78°F and coldest in February near 36°F.

It's comfortable for a long swim from Jun 16 to Oct 5 — about 3.7 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan38Bracing
Feb36Bracing
Mar40Bracing
Apr47Bracing
May58Bracing
Jun68Refreshing
Jul76Warm
Aug78Warm
Sep74Refreshing
Oct65Cool
Nov53Bracing
Dec44Bracing

UV index in Baltimore 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 Baltimore peaks around July 10 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJul 10UV 9Dec 19UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug7High
Sep6High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Baltimore 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 Baltimore is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (November, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1216 µg/m³Nov 118 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Good
Mar13Moderate
Apr13Moderate
May15Moderate
Jun16Moderate
Jul17Moderate
Aug14Moderate
Sep12Good
Oct9Good
Nov8Good
Dec10Good
Location & terrain

Where is Baltimore?

Baltimore sits at 39.3°N, 76.6°W, 33 ft above sea level, in United States. The nearest listed city is Frankford, 4.3 mi away.

Topography around Baltimore

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

Within 2 miles, the terrain around Baltimore has only modest variations in elevation — a maximum elevation change of 240 ft around an average of 72 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 630 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,906 ft.

The land around Baltimore is covered by artificial surfaces (80%) within 2 miles, trees (46%) and artificial surfaces (34%) within 10 miles, and trees (51%) within 50 miles.

2 miles
240 ft
10 miles
630 ft
50 miles
1,906 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Frankford 4.3 mi · Gwynn Oak 5.0 mi · Arbutus 5.6 mi · Rosedale 5.6 mi · Dundalk 5.6 mi · Catonsville 6.8 mi · Woodlawn 6.8 mi · Lochearn 6.8 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 Baltimore (39.2904°, -76.6122°, elevation 33 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).