Yajalón weather in December

In December, Yajalón sees average daytime highs of 24°C and overnight lows near 15°C, with 137 mm of rain across 13.8 wet days and about 11 hours of daylight. It is the 11th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 24°C through the month. The sky is clear or mostly clear about 32% of the time in December, and the air most often feels humid.

Daylight stretches from about 11 hours at the start of December to 11 hours by month's end. Set against the rest of the year, December is Yajalón's 4th-clearest and 6th-windiest month. For the whole year in context, see Yajalón's year-round climate.

Daytime high
24°
11th warmest
Overnight low
15°
3rd coldest
Rainfall
137 mm
13.8 wet days
Daylight
11 hours
6:36 AM – 5:35 PM
Cloud cover
54%
4th clearest
Wind
5 km/h
6th windiest
Solar energy
4.06 kWh/m²
Travel score
6.4
out of 10

Yajalón is municipal seat of Yajalón, State of Chiapas, Mexico.

Founded
1562

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 24°C through the month.

A typical December day in Yajalón reaches about 24°C in the afternoon and slips back to 15°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 28°C. Set against its neighbours, December runs about 1°C cooler than November and on par with January.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12516
22516
32516
42516
52515
62515
72515
82515
92515
102515
112515
122515
132515
142515
152515
162415
172415
182415
192415
202415
212415
222415
232415
242415
252415
262415
272415
282415
292415
302415
312415

Yajalón weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan24° / 14°15013.811.16.5
Feb26° / 15°9610.111.46.8
Mar28° / 16°839.311.96.6
Apr30° / 18°9510.512.45.2
May30° / 19°15616.912.84.1
Jun29° / 20°29224.2133.5
Jul29° / 19°18220.912.94.0
Aug29° / 19°24224.512.63.6
Sep28° / 19°30627.612.13.4
Oct27° / 19°26323.711.64.4
Nov25° / 17°19416.611.25.7
Dec24° / 15°13713.8116.4

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 22% of December, with mostly cloudy or overcast conditions the remaining 46%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15347
25446
35446
45545
55545
65644
75644
85644
95644
105644
115644
125644
135545
145545
155545
165545
175545
185545
195545
205446
215347
225347
235347
245347
255347
265248
275248
285149
295149
305149
315050

Chance of precipitation in December

Any precipitation

Yajalón gets around 137 mm of rain over 13.8 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 45% and peaks near 47% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
146
246
346
445
545
645
745
845
945
1045
1145
1245
1345
1445
1544
1644
1744
1844
1944
2044
2145
2245
2345
2446
2546
2646
2747
2847
2947
3047
3147

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the humid band about 57% of days. Sticky, muggy-or-worse air turns up on roughly 24% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
12124936
22125135
32125234
42125333
52125531
63125530
73125629
83125728
93125827
103135826
113135925
123145825
133145924
143155824
153165823
164165723
174175722
184185622
194195621
204195720
214205620
223205720
233205819
243205819
253205819
263205918
273205918
284205818
294205917
304205917
314206016

Wind in December

Winds average 5 km/h in December.

Across December, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 11 hours at the start of December to 11 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over December. Sunrise moves from 6:28 AM to 6:43 AM, and sunset from 5:31 PM to 5:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.06:285:31
211.06:285:31
311.06:295:31
411.06:295:31
511.06:305:31
611.06:315:32
711.06:315:32
811.06:325:32
911.06:325:32
1011.06:335:33
1111.06:335:33
1211.06:345:33
1311.06:355:34
1411.06:355:34
1511.06:365:34
1611.06:365:35
1711.06:375:35
1811.06:375:36
1911.06:385:36
2011.06:385:37
2111.06:395:37
2211.06:395:38
2311.06:405:38
2411.06:405:38
2511.06:405:39
2611.06:415:39
2711.06:415:40
2811.06:425:41
2911.06:425:41
3011.06:435:42
3111.06:435:42

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.06 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.06 kWh/m² to a high of 6.51 kWh/m² in April across the year — December's 4.06 kWh/m² sits near the bottom.

012345151015202531
Solar energy (kWh/m²)Level
14.1Bright
24.1Bright
34.1Bright
44.1Bright
54.1Bright
64.1Bright
74.0Bright
84.0Bright
94.0Bright
104.0Bright
114.0Bright
124.0Bright
134.0Bright
144.0Bright
154.0Bright
164.0Bright
174.0Bright
184.0Moderate
194.0Moderate
204.0Moderate
214.0Bright
224.0Bright
234.0Bright
244.0Bright
254.0Bright
264.0Bright
274.0Bright
284.0Bright
294.0Bright
304.0Bright
314.0Bright
Planning a trip in December

Is December a good time to visit Yajalón?

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

6.4
Sightseeing
4th-best month of the year
5.6
Beach & pool
5th-best month of the year

December is a reasonable time to visit Yajalón for sightseeing.

What to pack for Yajalón in December

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

In December, Yajalón sees daytime highs around 24°C and nights near 15°C. Pack rain gear. Worth having: light clothes. About 14 days see rain.

rain gearlight clothes

UV index in Yajalón in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Yajalón peaks around April 12 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highApr 12UV 14Dec 19UV 8
UV index (midday)Level
Jan8Very high
Feb12Extreme
Mar13Extreme
Apr14Extreme
May10Very high
Jun13Extreme
Jul12Extreme
Aug13Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec8Very high

Air quality in Yajalón 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 Yajalón is worst in April — around 80 µg/m³ PM2.5 (unhealthy), about 6.5× the cleanest month (December, 12 µg/m³).

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

0306090JanFebMarAprMayJunJulAugSepOctNovDecModerateUnhealthyModerateApr 2379 µg/m³Dec 2212 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb14Moderate
Mar20Moderate
Apr80Unhealthy
May77Unhealthy
Jun27Moderate
Jul26Moderate
Aug22Moderate
Sep21Moderate
Oct17Moderate
Nov15Moderate
Dec12Moderate
Location & terrain

Where is Yajalón?

Yajalón sits at 17.2°N, 92.3°W, 797 m above sea level, in Mexico. The nearest listed city is Ocosingo, 39 km away.

Topography around Yajalón

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

Within 3 km, the terrain around Yajalón has large variations in elevation — a maximum elevation change of 961 m around an average of 1,037 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,160 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,873 m.

The land around Yajalón is covered by trees (72%) and grassland (21%) within 3 km, trees (82%) within 16 km, and trees (68%) and grassland (30%) within 80 km.

3 km
961 m
16 km
2,160 m
80 km
2,873 m
treesgrasslandartificial surfaceswater
December weather nearby: Ocosingo 39 km · Palenque 53 km · San Cristóbal de las Casas 59 km · Macuspana 71 km · Teopisca 72 km · Teapa 78 km · Emiliano Zapata 87 km · Chiapas 89 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 Yajalón (17.1729°, -92.3339°, elevation 797 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).