Piedras Negras weather in December

In December, Piedras Negras sees average daytime highs of 19°C and overnight lows near 8°C, with 27 mm of rain across 4.5 wet days and about 10.2 hours of daylight. It is the 11th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 21°C in the first days to 18°C by the end. The sky is clear or mostly clear about 49% of the time in December, and the air most often feels dry.

Daylight stretches from about 10 h 18 min at the start of December to 10 h 12 min by month's end. Set against the rest of the year, December is Piedras Negras's 8th-clearest and 12th-windiest month. For the whole year in context, see Piedras Negras's year-round climate.

Daytime high
19°
11th warmest
Overnight low
2nd coldest
Rainfall
27 mm
4.5 wet days
Daylight
10 h 12 min
7:33 AM – 5:44 PM
Cloud cover
49%
8th clearest
Wind
12 km/h
12th windiest
Solar energy
3.04 kWh/m²
Travel score
7.1
out of 10

Piedras Negras is municipal seat of Piedras Negras, State of Coahuila, Mexico.

Founded
1850

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 21°C in the first days to 18°C by the end.

A typical December day in Piedras Negras reaches about 19°C in the afternoon and slips back to 8°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 25°C. Set against its neighbours, December runs about 4°C cooler than November and on par with January.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
12110
2219
3219
4209
5209
6209
7209
8209
9208
10208
11208
12208
13198
14198
15198
16198
17198
18197
19197
20197
21197
22197
23197
24197
25197
26187
27187
28187
29187
30187
31187

How December really feels in Piedras Negras

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

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

December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Piedras Negras weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan19° / 254.410.47.1
Feb22° / 10°274.5117.6
Mar26° / 14°435.611.87.5
Apr30° / 18°486.112.75.5
May33° / 22°748.313.43.5
Jun36° / 25°466.113.82.1
Jul37° / 26°505.913.61.6
Aug37° / 26°464.6131.6
Sep34° / 23°798.312.23.5
Oct29° / 18°606.511.36.2
Nov23° / 12°364.810.67.8
Dec19° / 274.510.27.1

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 49% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 9% of December, with mostly cloudy or overcast conditions the remaining 42%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16040
25941
35842
45842
55743
65743
75842
85842
95842
105842
115842
125941
136040
146040
156040
166040
176040
186040
196040
206040
215941
225842
235743
245743
255644
265644
275545
285446
295446
305446
315446

Chance of precipitation in December

Any precipitation

Piedras Negras gets around 27 mm of rain over 4.5 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 14% and peaks near 15% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
115
215
315
415
515
615
715
815
915
1015
1115
1214
1314
1414
1514
1614
1714
1814
1914
2014
2114
2214
2314
2414
2514
2614
2714
2814
2914
3014
3114

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 86% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1781282
2781282
3791272
4801172
5811171
6821161
7821161
8831061
9831061
1085951
1185951
1285951
1385951
1487841
1588840
1688840
1788840
1889740
1989740
2089740
2189740
2290640
2390640
2490640
2590640
2690640
2790640
2890640
2991540
3091540
3191540

Wind in December

Winds average 12 km/h in December, the calmest month.

Across December, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1011calm
1111calm
1211calm
1311calm
1411calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712calm
2812calm
2912calm
3012calm
3112calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 h 18 min at the start of December to 10 h 12 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 7:23 AM to 7:39 AM, and sunset from 5:41 PM to 5:51 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.37:235:41
210.37:245:41
310.37:245:41
410.37:255:41
510.37:265:41
610.27:265:41
710.27:275:41
810.27:285:42
910.27:285:42
1010.27:295:42
1110.27:305:42
1210.27:305:42
1310.27:315:43
1410.27:325:43
1510.27:325:43
1610.27:335:44
1710.27:335:44
1810.27:345:44
1910.27:345:45
2010.27:355:45
2110.27:365:46
2210.27:365:46
2310.27:365:47
2410.27:375:47
2510.27:375:48
2610.27:385:48
2710.27:385:49
2810.27:385:49
2910.27:395:50
3010.27:395:50
3110.27:395:51

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 3.04 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 3.04 kWh/m² to a high of 6.86 kWh/m² in July across the year — December's 3.04 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
13.1Moderate
23.1Moderate
33.1Moderate
43.1Moderate
53.1Moderate
63.0Moderate
73.0Moderate
83.0Moderate
93.0Moderate
103.0Moderate
113.0Moderate
123.0Moderate
133.0Moderate
143.0Moderate
153.0Moderate
163.0Moderate
173.0Moderate
183.0Moderate
193.0Moderate
203.0Moderate
213.0Moderate
223.0Moderate
233.1Moderate
243.1Moderate
253.1Moderate
263.1Moderate
273.1Moderate
283.1Moderate
293.1Moderate
303.1Moderate
313.1Moderate
Planning a trip in December

Is December a good time to visit Piedras Negras?

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

7.1
Sightseeing
4th-best month of the year
3.3
Beach & pool
11th-best month of the year

December is one of the better times to visit Piedras Negras for general sightseeing.

What to pack for Piedras Negras in December

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

In December, Piedras Negras sees daytime highs around 19°C and nights near 8°C. Worth packing: a warm layer. About 5 days see rain.

a warm layer

UV index in Piedras Negras in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Piedras Negras peaks around July 14 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 4 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeVery highHighModerateJul 14UV 11Dec 18UV 4
UV index (midday)Level
Jan5Moderate
Feb6High
Mar7Very high
Apr10Very high
May10Extreme
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep9Very high
Oct7High
Nov5Moderate
Dec4Moderate

Air quality in Piedras Negras 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 Piedras Negras is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (February, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1418 µg/m³Feb 178 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb8Good
Mar9Good
Apr10Good
May16Moderate
Jun16Moderate
Jul18Moderate
Aug13Moderate
Sep12Good
Oct9Good
Nov10Good
Dec11Good
Location & terrain

Where is Piedras Negras?

Piedras Negras sits at 28.7°N, 100.5°W, 223 m above sea level, in Mexico. The nearest listed city is Eagle Pass, 3.0 km away.

Topography around Piedras Negras

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Piedras Negras.

Within 3 km, the terrain around Piedras Negras has only modest variations in elevation — a maximum elevation change of 52 m around an average of 227 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 110 m; within 80 km, significant variations in elevation — a maximum elevation change of 586 m.

The land around Piedras Negras is covered by artificial surfaces (60%) within 3 km, shrubs (70%) within 16 km, and shrubs (89%) within 80 km.

3 km
52 m
16 km
110 m
80 km
586 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Eagle Pass 3.0 km · Nava 39 km · Allende 51 km · Ciudad Acuña 81 km · Del Rio 82 km · Uvalde 91 km · Nueva Rosita 109 km · Sabinas 110 km

Mexico travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B
120 / 127 V · 60 Hz
Prices
≈ 54% of US
price level, 2025
GDP per capita
$13,889
2025
Happiness
7.0 / 10
World Happiness, 2025
Safe drinking water
43%
of population, 2024
Homicide rate
24.9
per 100k, 2023
Road deaths
12.8
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Very low
EF EPI 440
Religion
Catholic 78%no religion 11%other Evangelical Churches 8%Jehovah Witness 1%

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 Piedras Negras (28.7001°, -100.5235°, elevation 223 m), 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).