Arroyo Seco weather in December

In December, Arroyo Seco sees average daytime highs of 29°C and overnight lows near 18°C, with 107 mm of rain across 9 wet days and about 14.2 hours of daylight. It is the 2nd-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 28°C in the first days to 30°C by the end. The sky is clear or mostly clear about 49% of the time in December, and the air most often feels humid.

Daylight stretches from about 14 hours at the start of December to 14 h 12 min by month's end. Set against the rest of the year, December is Arroyo Seco's 3rd-clearest and 6th-windiest month. For the whole year in context, see Arroyo Seco's year-round climate.

Daytime high
29°
2nd warmest
Overnight low
18°
10th coldest
Rainfall
107 mm
9 wet days
Daylight
14 h 12 min
5:53 AM – 8:04 PM
Cloud cover
44%
3rd clearest
Wind
12 km/h
6th windiest
Solar energy
7.33 kWh/m²
Travel score
5.9
out of 10

Arroyo Seco is town in Santa Fe Province, Argentina.

Density
146/km²
people per km²
Founded
1888

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 28°C in the first days to 30°C by the end.

A typical December day in Arroyo Seco reaches about 29°C in the afternoon and slips back to 18°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 34°C. Set against its neighbours, December runs about 3°C warmer than November and about 1°C cooler than January.

10°15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12816
22816
32816
42817
52817
62817
72817
82817
92817
102917
112917
122917
132917
142917
152918
162918
172918
182918
192918
202918
212918
222918
233018
243018
253019
263019
273019
283019
293019
303019
313019

Arroyo Seco weather by month

How December compares with the rest of the year at a glance. December is the 2nd-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 19°105813.95.5
Feb29° / 18°1118.213.26.0
Mar27° / 17°1217.412.37.1
Apr23° / 13°1048.211.27.4
May19° / 10°675.910.36.8
Jun16° / 424.99.95.8
Jul16° / 395.1105.6
Aug18° / 544.810.86.8
Sep21° / 10°65611.87.2
Oct23° / 13°1139.812.87.1
Nov26° / 15°113813.77.1
Dec29° / 18°107914.25.9

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 14% of December, with mostly cloudy or overcast conditions the remaining 37%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16337
26337
36436
46436
56535
66535
76535
86535
96535
106535
116535
126535
136535
146535
156535
166535
176436
186436
196436
206337
216337
226337
236238
246238
256238
266139
276139
286139
296139
306139
316139

Chance of precipitation in December

Any precipitation

Arroyo Seco gets around 107 mm of rain over 9 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 29% and peaks near 31% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
127
227
327
427
527
628
728
828
928
1029
1129
1230
1330
1430
1531
1631
1731
1831
1931
2031
2130
2230
2330
2430
2529
2629
2728
2828
2927
3027
3127

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 30% of days. Sticky, muggy-or-worse air turns up on roughly 24% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
13329271010
23229281010
33228281010
43128281120
53128291120
63027291220
72927301220
82927301320
92826311320
102726311320
112626321420
122526321420
132426331530
142325331630
152225341730
162124341730
172024341830
182023331940
191923332140
201822332250
211722322360
221622312460
231621312570
241521302680
251421292790
261420282890
2713202828100
2812202729111
2911202729121
3011202630121
3110202630131

Wind in December

Winds average 12 km/h in December.

Across December, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 14 hours at the start of December to 14 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over December. Sunrise moves from 5:51 AM to 6:00 AM, and sunset from 7:53 PM to 8:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.05:517:53
214.05:517:54
314.15:517:54
414.15:517:55
514.15:517:56
614.15:517:57
714.15:517:58
814.15:517:58
914.15:517:59
1014.15:518:00
1114.15:518:00
1214.25:528:01
1314.25:528:02
1414.25:528:02
1514.25:528:03
1614.25:538:04
1714.25:538:04
1814.25:548:05
1914.25:548:05
2014.25:548:06
2114.25:558:06
2214.25:558:07
2314.25:568:07
2414.25:568:08
2514.25:578:08
2614.25:578:09
2714.25:588:09
2814.25:588:09
2914.25:598:10
3014.26:008:10
3114.26:008:10

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 7.33 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.36 kWh/m² to a high of 7.33 kWh/m² in December across the year — December's 7.33 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
17.3Intense
27.3Intense
37.3Intense
47.3Intense
57.3Intense
67.3Intense
77.3Intense
87.4Intense
97.4Intense
107.4Intense
117.3Intense
127.3Intense
137.3Intense
147.3Intense
157.3Intense
167.3Intense
177.3Intense
187.3Intense
197.3Intense
207.3Intense
217.3Intense
227.3Intense
237.3Intense
247.3Intense
257.3Intense
267.3Intense
277.3Intense
287.2Intense
297.2Intense
307.2Intense
317.2Intense
Planning a trip in December

Is December a good time to visit Arroyo Seco?

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

5.9
Sightseeing
9th-best month of the year
7.3
Beach & pool
3rd-best month of the year

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

What to pack for Arroyo Seco in December

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

In December, Arroyo Seco sees daytime highs around 29°C and nights near 18°C. Pack light clothes and sun protection. Worth having: rain gear. About 9 days see rain.

light clothessun protectionrain gear

UV index in Arroyo Seco in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Arroyo Seco peaks around January 15 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateHighVery highExtremeJan 15UV 13Jun 19UV 3
UV index (midday)Level
Jan14Extreme
Feb12Extreme
Mar10Very high
Apr6High
May4Moderate
Jun3Moderate
Jul3Moderate
Aug4Moderate
Sep6High
Oct9Very high
Nov11Extreme
Dec12Extreme

Air quality in Arroyo Seco 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 Arroyo Seco is worst in August — around 20 µg/m³ PM2.5 (moderate), about 3.0× the cleanest month (April, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodAug 2220 µg/m³Apr 157 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb8Good
Mar8Good
Apr7Good
May8Good
Jun10Good
Jul13Moderate
Aug20Moderate
Sep19Moderate
Oct10Good
Nov8Good
Dec8Good
Location & terrain

Where is Arroyo Seco?

Arroyo Seco sits at 33.2°S, 60.5°W, 31 m above sea level, in Argentina. The nearest listed city is Gobernador Gálvez, 18 km away.

Topography around Arroyo Seco

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

Within 3 km, the terrain around Arroyo Seco has only modest variations in elevation — a maximum elevation change of 29 m around an average of 22 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 59 m; within 80 km, only modest variations in elevation — a maximum elevation change of 101 m.

The land around Arroyo Seco is covered by cropland (46%) and grassland (23%) within 3 km, cropland (53%) and wetland (23%) within 16 km, and cropland (57%) and wetland (27%) within 80 km.

3 km
29 m
16 km
59 m
80 km
101 m
treesgrasslandcroplandartificial surfaceswaterwetland
December weather nearby: Gobernador Gálvez 18 km · Villa Constitución 19 km · Rosario 26 km · Pérez 29 km · San Nicolás de los Arroyos 34 km · Granadero Baigorria 38 km · Capitán Bermúdez 42 km · Ramallo 60 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 Arroyo Seco (-33.1536°, -60.5117°, elevation 31 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).