Tres Isletas weather in December

In December, Tres Isletas sees average daytime highs of 32°C and overnight lows near 21°C, with 144 mm of rain across 11.1 wet days and about 13.6 hours of daylight. It is the 2nd-warmest and 1st-wettest month of the year here.

Highs climb over the month, from about 31°C in the first days to 33°C by the end. The sky is clear or mostly clear about 40% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 13 h 30 min at the start of December to 13 h 36 min by month's end. Set against the rest of the year, December is Tres Isletas's 8th-clearest and 6th-windiest month. For the whole year in context, see Tres Isletas's year-round climate.

Daytime high
32°
2nd warmest
Overnight low
21°
10th coldest
Rainfall
144 mm
11.1 wet days
Daylight
13 h 36 min
6:09 AM – 7:47 PM
Cloud cover
52%
8th clearest
Wind
11 km/h
6th windiest
Solar energy
6.74 kWh/m²
Travel score
3.7
out of 10

Tres Isletas is human settlement.

Founded
1937

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 31°C in the first days to 33°C by the end.

A typical December day in Tres Isletas reaches about 32°C in the afternoon and slips back to 21°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 37°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)
13120
23120
33120
43120
53220
63220
73221
83221
93221
103221
113221
123221
133221
143221
153321
163321
173321
183321
193322
203322
213322
223322
233322
243322
253322
263322
273322
283322
293322
303322
313322

How December really feels in Tres Isletas

Once humidity and wind are folded in, December averages 31 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
31
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.

Tres Isletas weather by month

How December compares with the rest of the year at a glance. December is the 2nd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan33° / 22°12811.413.53.3
Feb32° / 22°13311.112.93.9
Mar30° / 20°13811.412.24.9
Apr27° / 17°1219.411.46.6
May23° / 14°607.410.77.3
Jun22° / 12°446.810.47.1
Jul22° / 11°345.610.57.6
Aug25° / 12°414.711.18.1
Sep27° / 15°586.611.87.1
Oct30° / 18°12510.212.65.3
Nov31° / 19°1411013.34.7
Dec32° / 21°14411.113.63.7

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 17% of December, with mostly cloudy or overcast conditions the remaining 43%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15446
25446
35446
45446
55545
65545
75743
85743
95743
105941
115941
126040
136139
146139
156238
166238
176337
186238
196139
206040
216040
225842
235842
245644
255545
265446
275347
285347
295347
305248
315347

Chance of precipitation in December

Any precipitation

Tres Isletas gets around 144 mm of rain over 11.1 wet days in December, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 36% and peaks near 38% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
137
237
337
436
536
635
735
834
934
1033
1133
1233
1333
1433
1533
1633
1734
1834
1935
2035
2136
2236
2337
2438
2538
2638
2738
2838
2938
3037
3137

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 34% of days. Sticky, muggy-or-worse air turns up on roughly 66% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
17122429271
27112428282
36112428292
46112428292
56112428302
66102428302
76102428302
85102428312
95102428312
105102428312
115102328312
124102328323
134102328323
144102228323
154102129333
164102129333
173102029343
183101929344
193101929354
203101829364
213101728375
222101728385
232101628386
242101627397
252101527397
262101526398
271101526408
281101526409
291101525409
301101525409
31191525419

Wind in December

Winds average 11 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
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3110calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 h 30 min at the start of December to 13 h 36 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 6:06 AM to 6:16 AM, and sunset from 7:37 PM to 7:54 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.56:067:37
213.56:067:38
313.66:067:39
413.66:067:40
513.66:067:40
613.66:067:41
713.66:067:42
813.66:067:42
913.66:077:43
1013.66:077:44
1113.66:077:44
1213.66:077:45
1313.66:087:45
1413.66:087:46
1513.66:087:47
1613.66:097:47
1713.66:097:48
1813.66:097:48
1913.76:107:49
2013.76:107:49
2113.76:117:50
2213.76:117:50
2313.76:127:51
2413.76:127:51
2513.76:137:52
2613.66:137:52
2713.66:147:52
2813.66:147:53
2913.66:157:53
3013.66:157:53
3113.66:167:54

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 2.66 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
16.5Intense
26.5Intense
36.5Intense
46.5Intense
56.5Intense
66.6Intense
76.6Intense
86.6Intense
96.7Intense
106.7Intense
116.7Intense
126.7Intense
136.8Intense
146.8Intense
156.8Intense
166.8Intense
176.8Intense
186.9Intense
196.9Intense
206.9Intense
216.9Intense
226.9Intense
236.9Intense
246.9Intense
256.8Intense
266.8Intense
276.8Intense
286.8Intense
296.8Intense
306.8Intense
316.8Intense
Planning a trip in December

Is December a good time to visit Tres Isletas?

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

3.7
Sightseeing
11th-best month of the year
6.3
Beach & pool
7th-best month of the year

December is a weaker month for outdoor sightseeing in Tres Isletas. The water and warmth also suit a beach or pool day.

What to pack for Tres Isletas in December

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

In December, Tres Isletas sees daytime highs around 32°C and nights near 21°C. Pack light clothes and sun protection. Worth having: rain gear. About 11 days see rain.

light clothessun protectionrain gear

UV index in Tres Isletas 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 Tres Isletas peaks around January 18 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 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 18UV 14Jul 12UV 4
UV index (midday)Level
Jan15Extreme
Feb14Extreme
Mar12Extreme
Apr9Very high
May6High
Jun5Moderate
Jul4Moderate
Aug5High
Sep8Very high
Oct7High
Nov12Extreme
Dec13Extreme

Air quality in Tres Isletas 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 Tres Isletas is worst in August — around 31 µg/m³ PM2.5 (moderate), about 5.1× the cleanest month (April, 6 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodAug 2330 µg/m³Apr 236 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb10Good
Mar8Good
Apr6Good
May6Good
Jun7Good
Jul15Moderate
Aug31Moderate
Sep29Moderate
Oct18Moderate
Nov10Good
Dec9Good
Location & terrain

Where is Tres Isletas?

Tres Isletas sits at 26.3°S, 60.4°W, 102 m above sea level, in Argentina. The nearest listed city is Juan José Castelli, 48 km away.

Topography around Tres Isletas

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

Within 3 km, the terrain around Tres Isletas has only modest variations in elevation — a maximum elevation change of 11 m around an average of 99 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 20 m; within 80 km, only modest variations in elevation — a maximum elevation change of 61 m.

The land around Tres Isletas is covered by cropland (33%), grassland (32%) and trees (21%) within 3 km, trees (48%) and cropland (34%) within 16 km, and trees (61%) and cropland (24%) within 80 km.

3 km
11 m
16 km
20 m
80 km
61 m
treesshrubsgrasslandcroplandartificial surfaces
December weather nearby: Juan José Castelli 48 km · Presidencia Roque Sáenz Peña 50 km · Quitilipi 63 km · Machagai 75 km · Las Breñas 105 km · General José de San Martín 111 km · Charata 123 km · General Pinedo 138 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 Tres Isletas (-26.3407°, -60.4321°, elevation 102 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).