Tres Arroyos weather in December

In December, Tres Arroyos sees average daytime highs of 27°C and overnight lows near 14°C, with 78 mm of rain across 8.8 wet days and about 14.6 hours of daylight. It is the 3rd-warmest and 2nd-wettest month of the year here.

Highs climb over the month, from about 25°C in the first days to 28°C by the end. The sky is clear or mostly clear about 55% of the time in December, and the air most often feels dry.

Daylight stretches from about 14 h 30 min at the start of December to 14 h 36 min by month's end. Set against the rest of the year, December is Tres Arroyos's 2nd-clearest and 1st-windiest month. For the whole year in context, see Tres Arroyos's year-round climate.

Daytime high
27°
3rd warmest
Overnight low
14°
10th coldest
Rainfall
78 mm
8.8 wet days
Daylight
14 h 42 min
5:37 AM – 8:17 PM
Cloud cover
41%
2nd clearest
Wind
17 km/h
1st windiest
Solar energy
7.77 kWh/m²
Travel score
6.9
out of 10

Tres Arroyos is city in Buenos Aires Province, Argentina.

Density
3,139/km²
people per km²
Founded
1884

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 25°C in the first days to 28°C by the end.

A typical December day in Tres Arroyos reaches about 27°C in the afternoon and slips back to 14°C overnight — a 13°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 33°C. Set against its neighbours, December runs about 4°C warmer than November and about 2°C cooler than January.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
12512
22512
32512
42512
52512
62613
72613
82613
92613
102613
112613
122613
132713
142713
152714
162714
172714
182714
192714
202814
212814
222815
232815
242815
252815
262815
272815
282815
292815
302915
312915

How December really feels in Tres Arroyos

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.

Tres Arroyos weather by month

How December compares with the rest of the year at a glance. December is the 3rd-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 15°749.714.46.1
Feb27° / 15°758.313.56.9
Mar25° / 13°768.212.37.4
Apr21° / 10°647.2116.9
May17° / 466.29.95.7
Jun13° / 335.29.44.2
Jul13° / 386.19.63.8
Aug15° / 475.810.54.9
Sep17° / 516.911.75.8
Oct20° / 789.4136.4
Nov23° / 11°839.314.17.1
Dec27° / 14°788.814.66.9

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 55% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 15% of December, with mostly cloudy or overcast conditions the remaining 30%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16733
26733
36733
46733
56733
66733
76733
86733
96733
106733
116832
126832
136832
146931
156931
167030
177030
187129
197228
207228
217228
227327
237327
247426
257426
267327
277327
287327
297327
307327
317228

Chance of precipitation in December

Any precipitation

Tres Arroyos gets around 78 mm of rain over 8.8 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 28% and peaks near 32% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
127
227
327
427
527
627
727
827
927
1027
1126
1226
1326
1426
1526
1627
1727
1827
1928
2028
2128
2229
2329
2430
2530
2630
2731
2831
2931
3031
3132

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 67% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1761671
2761671
3761671
4751771
5751771
6741871
7741871
8741871
9731971
10731971
11731971
12731971
13722071
14722071
15722071
16712081
17712081
18692191
19682192
206622102
216522112
226323122
236323122
246024133
255924143
265825143
275625154
285426164
295426164
305426164
315227174

Wind in December

Winds average 17 km/h in December, the windiest month of the year.

Across December, daily wind ranges from about 16 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
116light breeze
216light breeze
316light breeze
416light breeze
516light breeze
616light breeze
716light breeze
817light breeze
917light breeze
1017light breeze
1117light breeze
1217light breeze
1317light breeze
1417light breeze
1517light breeze
1617light breeze
1717light breeze
1817light breeze
1917light breeze
2017light breeze
2117light breeze
2217light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze
3117light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 14 h 30 min at the start of December to 14 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 5:37 AM to 5:45 AM, and sunset from 8:05 PM to 8:23 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.55:378:05
214.55:368:06
314.55:368:07
414.55:368:08
514.55:368:09
614.65:368:10
714.65:368:10
814.65:368:11
914.65:368:12
1014.65:368:13
1114.65:368:14
1214.65:368:14
1314.65:378:15
1414.65:378:16
1514.75:378:16
1614.75:378:17
1714.75:388:18
1814.75:388:18
1914.75:388:19
2014.75:398:19
2114.75:398:20
2214.75:408:20
2314.75:408:21
2414.75:418:21
2514.75:418:22
2614.75:428:22
2714.75:428:22
2814.75:438:23
2914.75:448:23
3014.65:448:23
3114.65:458:23

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 7.77 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 1.95 kWh/m² to a high of 7.77 kWh/m² in December across the year — December's 7.77 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
17.5Intense
27.6Intense
37.6Intense
47.6Intense
57.6Intense
67.6Intense
77.7Intense
87.7Intense
97.7Intense
107.7Intense
117.7Intense
127.8Intense
137.8Intense
147.8Intense
157.8Intense
167.8Intense
177.8Intense
187.8Intense
197.8Intense
207.8Intense
217.8Intense
227.8Intense
237.8Intense
247.8Intense
257.8Intense
267.8Intense
277.8Intense
287.8Intense
297.8Intense
307.8Intense
317.8Intense
Planning a trip in December

Is December a good time to visit Tres Arroyos?

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

6.9
Sightseeing
3rd-best month of the year
7.1
Beach & pool
2nd-best month of the year

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

What to pack for Tres Arroyos in December

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

In December, Tres Arroyos sees daytime highs around 27°C and nights near 14°C. Pack sun protection. Worth having: light clothes and rain gear. About 9 days see rain.

sun protectionlight clothesrain gear

Sea temperature near Tres Arroyos in December

The nearest coast averages about 18°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 56 km away) is warmest in February at about 21°C and coldest in August near 10°C.

It's comfortable for a long swim from Jan 8 to Mar 21 — about 2.4 months when the water holds above 20°C.

10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingcomfortable to swim
Sea temperature (°C)Comfort
Jan21Refreshing
Feb21Refreshing
Mar20Refreshing
Apr18Cool
May15Cool
Jun12Bracing
Jul10Bracing
Aug10Bracing
Sep11Bracing
Oct13Bracing
Nov16Cool
Dec18Cool

UV index in Tres Arroyos 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 Arroyos peaks around December 20 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateModerateVery highExtremeDec 20UV 12Jun 21UV 2
UV index (midday)Level
Jan12Extreme
Feb12Extreme
Mar8Very high
Apr6High
May3Moderate
Jun2Low
Jul2Moderate
Aug3Moderate
Sep5Moderate
Oct7Very high
Nov10Very high
Dec13Extreme
Location & terrain

Where is Tres Arroyos?

Tres Arroyos sits at 38.4°S, 60.3°W, 100 m above sea level, in Argentina. The nearest listed city is Benito Juárez, 89 km away.

Topography around Tres Arroyos

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

Within 3 km, the terrain around Tres Arroyos has only modest variations in elevation — a maximum elevation change of 21 m around an average of 109 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 93 m; within 80 km, significant variations in elevation — a maximum elevation change of 268 m.

The land around Tres Arroyos is covered by artificial surfaces (43%) and grassland (41%) within 3 km, cropland (81%) within 16 km, and cropland (61%) and grassland (28%) within 80 km.

3 km
21 m
16 km
93 m
80 km
268 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Benito Juárez 89 km · Coronel Pringles 104 km · Necochea 135 km · Tandil 154 km · Olavarría 165 km · Punta Alta 166 km · Bahía Blanca 177 km · Coronel Suárez 178 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 Arroyos (-38.3769°, -60.2756°, elevation 100 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).