Monterrey weather in December

In December, Monterrey sees average daytime highs of 20°C and overnight lows near 10°C, with 32 mm of precipitation across 5.7 wet days and about 10.4 hours of daylight. It is the 11th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 21°C in the first days to 19°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 30 min at the start of December to 10 h 24 min by month's end. Set against the rest of the year, December is Monterrey's 9th-clearest and 12th-windiest month. For the whole year in context, see Monterrey's year-round climate.

Daytime high
20°
11th warmest
Overnight low
10°
2nd coldest
Precipitation
32 mm
5.7 wet days
Daylight
10 h 24 min
7:25 AM – 5:50 PM
Cloud cover
46%
9th clearest
Wind
7 km/h
12th windiest
Solar energy
3.66 kWh/m²
Travel score
7.2
out of 10

Monterrey is capital of the State of Nuevo Leon, Mexico.

Air quality
Elevated
PM2.5 23 µg/m³ · 2018
Density
1,171/km²
people per km²
Founded
1596

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 19°C by the end.

A typical December day in Monterrey reaches about 20°C in the afternoon and slips back to 10°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 27°C. Set against its neighbours, December runs about 3°C cooler than November and on par with January.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
12211
22111
32111
42111
52111
62111
72111
82110
92110
102110
112110
122010
132010
142010
152010
162010
172010
182010
192010
20209
21209
22209
23209
24199
25199
26199
27199
28199
29199
30199
31199

How December really feels in Monterrey

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.

Monterrey weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan20° / 376.310.67.0
Feb23° / 11°335.711.17.6
Mar26° / 14°467.111.87.5
Apr29° / 17°466.712.66.1
May31° / 20°527.713.24.7
Jun33° / 22°395.413.63.9
Jul34° / 23°414.713.43.6
Aug34° / 23°314.512.93.6
Sep30° / 21°11710.412.24.9
Oct27° / 17°597.211.47.0
Nov23° / 13°386.310.77.7
Dec20° / 10°325.710.47.2

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 13% of December, with mostly cloudy or overcast conditions the remaining 38%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16535
26535
36436
46337
56238
66238
76238
86238
96238
106238
116238
126238
136337
146337
156337
166337
176337
186337
196238
206238
216238
226139
236139
246040
256040
266040
275941
285842
295842
305842
315842

Chance of precipitation in December

Any precipitation

Monterrey gets around 32 mm of rain and snow over 5.7 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 18% and peaks near 20% on the wettest days, and about 0 day brings snow.

0%10%20%30%151015202531
Rain chance (%)
116
216
316
416
516
617
717
817
917
1017
1117
1217
1318
1418
1518
1618
1718
1819
1919
2019
2119
2220
2320
2420
2520
2620
2720
2820
2920
3020
3120

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 80% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
16622111
26722101
36921100
47020100
57020100
67119100
77119100
8731890
9741790
10751690
11751690
12771580
13781480
14791470
15801370
16811360
17821260
18821260
19831250
20841150
21841150
22861040
23861040
24861040
2587940
2688930
2788930
2888930
2988930
3089920
3189920

Wind in December

Winds average 7 km/h in December, the calmest month.

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

0246810151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 h 30 min at the start of December to 10 h 24 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 7:16 AM to 7:32 AM, and sunset from 5:46 PM to 5:57 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.57:165:46
210.57:165:46
310.57:175:47
410.57:185:47
510.57:185:47
610.57:195:47
710.57:205:47
810.47:205:47
910.47:215:47
1010.47:225:48
1110.47:225:48
1210.47:235:48
1310.47:245:49
1410.47:245:49
1510.47:255:49
1610.47:255:50
1710.47:265:50
1810.47:265:50
1910.47:275:51
2010.47:275:51
2110.47:285:52
2210.47:285:52
2310.47:295:53
2410.47:295:53
2510.47:305:54
2610.47:305:54
2710.47:315:55
2810.47:315:55
2910.47:315:56
3010.47:325:56
3110.47:325:57

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 3.66 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 3.66 kWh/m² to a high of 6.78 kWh/m² in June across the year — December's 3.66 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
13.8Moderate
23.7Moderate
33.7Moderate
43.7Moderate
53.7Moderate
63.7Moderate
73.7Moderate
83.7Moderate
93.6Moderate
103.6Moderate
113.6Moderate
123.6Moderate
133.6Moderate
143.6Moderate
153.6Moderate
163.6Moderate
173.6Moderate
183.6Moderate
193.6Moderate
203.6Moderate
213.6Moderate
223.6Moderate
233.6Moderate
243.6Moderate
253.6Moderate
263.6Moderate
273.7Moderate
283.7Moderate
293.7Moderate
303.7Moderate
313.7Moderate
Planning a trip in December

Is December a good time to visit Monterrey?

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

7.2
Sightseeing
4th-best month of the year
3.9
Beach & pool
11th-best month of the year

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

What to pack for Monterrey in December

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

In December, Monterrey sees daytime highs around 20°C and nights near 10°C. Little to plan around — just the basics. About 6 days see rain.

UV index in Monterrey in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Monterrey peaks around June 17 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 5 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeVery highHighJun 17UV 12Dec 18UV 5
UV index (midday)Level
Jan6High
Feb8Very high
Mar10Very high
Apr12Extreme
May12Extreme
Jun12Extreme
Jul12Extreme
Aug12Extreme
Sep11Extreme
Oct8Very high
Nov6High
Dec5High

Air quality in Monterrey 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 Monterrey is worst in December — around 26 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Seasonal pattern from CAMS reanalysis, scaled to Monterrey's WHO annual average of 23 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateDec 1726 µg/m³Aug 1520 µg/m³
PM2.5 (µg/m³)Level
Jan25Moderate
Feb22Moderate
Mar26Moderate
Apr23Moderate
May24Moderate
Jun21Moderate
Jul21Moderate
Aug19Moderate
Sep22Moderate
Oct22Moderate
Nov24Moderate
Dec26Moderate
Location & terrain

Where is Monterrey?

Monterrey sits at 25.7°N, 100.3°W, 560 m above sea level, in Mexico. The nearest listed city is Guadalupe, 6.0 km away.

Topography around Monterrey

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

Within 3 km, the terrain around Monterrey has only modest variations in elevation — a maximum elevation change of 172 m around an average of 542 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,798 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,519 m.

The land around Monterrey is covered by artificial surfaces (94%) within 3 km, artificial surfaces (54%) and trees (28%) within 16 km, and shrubs (55%) and trees (30%) within 80 km.

3 km
172 m
16 km
1,798 m
80 km
3,519 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
December weather nearby: Guadalupe 6.0 km · San Nicolás de los Garza 7.0 km · San Pedro Garza García 9.0 km · Ciudad General Escobedo 12 km · Santa Catarina 14 km · Jardines de la Silla 14 km · Mitras Poniente 15 km · Ciudad Apodaca 17 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 Monterrey (25.6843°, -100.3172°, elevation 560 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).