Posadas weather in December

In December, Posadas sees average daytime highs of 31°C and overnight lows near 21°C, with 164 mm of rain across 11.8 wet days and about 13.7 hours of daylight. It is the 2nd-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 45% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 13 h 36 min at the start of December to 13 h 42 min by month's end. Set against the rest of the year, December is Posadas's 7th-clearest and 8th-windiest month. For the whole year in context, see Posadas's year-round climate.

Daytime high
31°
2nd warmest
Overnight low
21°
10th coldest
Rainfall
164 mm
11.8 wet days
Daylight
13 h 42 min
5:48 AM – 7:31 PM
Cloud cover
50%
7th clearest
Wind
10 km/h
8th windiest
Solar energy
6.74 kWh/m²
Travel score
4.4
out of 10

Posadas is city in Argentina.

Density
317/km²
people per km²
Founded
1870

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 31°C through the month.

A typical December day in Posadas reaches about 31°C in the afternoon and slips back to 21°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 35°C. Set against its neighbours, December runs about 2°C warmer than November and about 1°C cooler than January.

15°20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13020
23020
33020
43020
53020
63120
73120
83120
93121
103121
113121
123121
133121
143121
153121
163121
173121
183121
193121
203121
213121
223121
233122
243122
253122
263222
273222
283222
293222
303222
313222

How December really feels in Posadas

Once humidity and wind are folded in, December averages 23 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
23
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in December is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Posadas weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 22°13312.713.54.0
Feb31° / 22°12911.9134.3
Mar30° / 21°12110.512.25.1
Apr27° / 18°1599.911.46.6
May23° / 15°1439.110.77.0
Jun21° / 13°1218.910.36.7
Jul21° / 12°1179.110.46.8
Aug23° / 13°907.9117.4
Sep25° / 15°1479.811.87.1
Oct27° / 17°21612.412.76.2
Nov29° / 19°15610.413.45.5
Dec31° / 21°16411.813.74.4

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 45% 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 42%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15743
25743
35743
45743
55842
65842
75842
85842
95941
105941
115941
125941
135941
146040
156040
166040
176040
186040
196040
206040
215941
225941
235941
245941
255842
265743
275743
285743
295743
305743
315842

Chance of precipitation in December

Any precipitation

Posadas gets around 164 mm of rain over 11.8 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 38% and peaks near 40% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
136
236
336
436
536
636
736
836
936
1036
1136
1236
1337
1437
1537
1638
1738
1838
1939
2039
2139
2239
2340
2440
2540
2640
2740
2840
2940
3039
3139

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the oppressive band about 36% of days. Sticky, muggy-or-worse air turns up on roughly 73% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
14122136261
24112136271
35102136271
45102136281
5592036291
6592036291
7592036301
8582036301
9482036311
10471937321
11471937321
12471937331
13471837341
14371837341
15371737351
16361737362
17261637362
18261636373
19261536373
20261536384
21161535394
22161534405
23151433415
24151432416
25151431427
26151430428
27151429438
28151528439
291515274310
300515264410
311415264410

Wind in December

Winds average 10 km/h in December.

Across December, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 h 36 min at the start of December to 13 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over December. Sunrise moves from 5:45 AM to 5:56 AM, and sunset from 7:22 PM to 7:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.65:457:22
213.65:457:22
313.65:457:23
413.65:457:24
513.65:467:24
613.75:467:25
713.75:467:26
813.75:467:27
913.75:467:27
1013.75:467:28
1113.75:477:28
1213.75:477:29
1313.75:477:30
1413.75:487:30
1513.75:487:31
1613.75:487:31
1713.75:497:32
1813.75:497:33
1913.75:497:33
2013.75:507:34
2113.75:507:34
2213.75:517:35
2313.75:517:35
2413.75:527:36
2513.75:527:36
2613.75:537:36
2713.75:537:37
2813.75:547:37
2913.75:547:37
3013.75:557:38
3113.75:567:38

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 6.74 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.61 kWh/m² to a high of 6.74 kWh/m² in December across the year — December's 6.74 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.6Intense
26.7Intense
36.7Intense
46.7Intense
56.7Intense
66.7Intense
76.7Intense
86.7Intense
96.7Intense
106.7Intense
116.8Intense
126.8Intense
136.8Intense
146.8Intense
156.8Intense
166.8Intense
176.8Intense
186.8Intense
196.8Intense
206.8Intense
216.8Intense
226.8Intense
236.8Intense
246.8Intense
256.7Intense
266.7Intense
276.7Intense
286.7Intense
296.7Intense
306.7Intense
316.8Intense
Planning a trip in December

Is December a good time to visit Posadas?

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

4.4
Sightseeing
10th-best month of the year
6.5
Beach & pool
4th-best month of the year

December is a reasonable time to visit Posadas for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Posadas in December

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

In December, Posadas sees daytime highs around 31°C and nights near 21°C. Pack light clothes and sun protection. Worth having: rain gear. About 12 days see rain.

light clothessun protectionrain gear

UV index in Posadas in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Posadas peaks around January 19 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 4 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighModerateHighVery highExtremeJan 19UV 14Jun 21UV 4
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar11Extreme
Apr8Very high
May5High
Jun4Moderate
Jul4Moderate
Aug5High
Sep8Very high
Oct7High
Nov11Extreme
Dec13Extreme

Air quality in Posadas 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 Posadas is worst in September — around 19 µg/m³ PM2.5 (moderate), about 3.0× the cleanest month (December, 6 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodSep 1319 µg/m³Mar 236 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb12Good
Mar6Good
Apr7Good
May7Good
Jun8Good
Jul10Good
Aug16Moderate
Sep19Moderate
Oct11Good
Nov15Moderate
Dec6Good
Location & terrain

Where is Posadas?

Posadas sits at 27.4°S, 55.9°W, 83 m above sea level, in Argentina. The nearest listed city is Encarnación, 9.0 km away.

Topography around Posadas

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

Within 3 km, the terrain around Posadas has only modest variations in elevation — a maximum elevation change of 72 m around an average of 116 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 139 m; within 80 km, significant variations in elevation — a maximum elevation change of 419 m.

The land around Posadas is covered by artificial surfaces (69%) and trees (22%) within 3 km, grassland (33%), trees (29%) and water (23%) within 16 km, and trees (40%) and grassland (30%) within 80 km.

3 km
72 m
16 km
139 m
80 km
419 m
treesgrasslandcroplandartificial surfaceswaterwetland
December weather nearby: Encarnación 9.0 km · Garupá 14 km · Trinidad 36 km · Apóstoles 60 km · Leandro N. Alem 64 km · Gobernador Virasora 74 km · Ituzaingó 78 km · Jardín América 79 km

Argentina travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / I
220 V · 50 Hz
Prices
≈ 46% of US
price level, 2025
GDP per capita
$14,898
2025
Happiness
6.4 / 10
World Happiness, 2025
Homicide rate
4.5
per 100k, 2023
Road deaths
14.1
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
High
EF EPI 575
Religion
Roman Catholic 63%none 19%Evangelical 15%Jehovah's Witness and Church of Jesus Christ 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 Posadas (-27.3918°, -55.9238°, elevation 83 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).