Climate and average weather in Rojas

In Rojas, the summers are hot, showery, and mostly clear and the winters are mild and partly cloudy.

Best: early August to late December

Over the course of the year, the temperature in Rojas typically varies from 5°C to 29°C, and is rarely below -1°C or above 34°C. January is the hottest month of the year, while July is the coldest.

Based on the travel score, the best times of year to visit Rojas for warm-weather activities are from late January to early June and early August to late December.

Hottest
Jan
29°
Coldest
Jul
Wettest
Oct
122 mm
Driest
Jul
33 mm
Rain / yr
981 mm
88 wet days
Daylight
9.7–14.3 h
shortest–longest
Elevation
56 m
34.2°S
Clearest
Jan
42% cloud

Rojas is town in the SanJuan Province, Argentina.

Founded
1777

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

Rojas weather by month, at a glance

The whole year in one picture — sky, rain, humidity, temperature and travel score. Click any band to jump to its full chart.

Each stripe is one measure across the whole year, stacked so a single day reads top to bottom. The sky band runs overcast grey on top down to clear blue at the base — more blue means sunnier — followed by the rainfall curve, the humidity band, a temperature strip that tints each stretch of the year by how warm its average high is, and the travel-score line at the foot. Scan straight down any date to read that day across every measure at once; the score climbs highest around early August to late December.

Temperature through the year

Average highAverage lowShaded bands: 10–90% of days

Daily average highs and lows in Rojas, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.

The hot season lasts 4.2 months, from November 13 to March 21, with daily high temperatures above 26°C. The hottest month of the year in Rojas is January, with an average high of 29°C and low of 18°C.

The cool season lasts 2.7 months, from May 25 to August 15, with daily high temperatures below 18°C. The coldest month of the year in Rojas is July, with an average low of 5°C and high of 15°C.

Days typically run about 11°C warmer than nights year-round.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDec
Avg high (°C)Avg low (°C)
Jan2918
Feb2817
Mar2615
Apr2312
May199
Jun166
Jul155
Aug186
Sep209
Oct2311
Nov2614
Dec2816

Average hourly temperature in Rojas

A compact picture of the whole year, hour by hour: each column is a day, each row an hour, and the color is the modeled average temperature. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.

Read left to right for the day of the year and top to bottom for the hour of the day; the color is the modeled temperature, cool blues through to hot reds on the same scale as the other charts. A vertical slice is a single day's swing — coolest just before dawn, warmest in the mid-afternoon — while a horizontal slice follows one hour across the seasons. The darker overlay marks night and the lighter one the twilight around sunrise and sunset. Colors run warmest on January afternoons, near 29°C, and coldest before dawn in July, near C.

JanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM

Rojas weather by month

Every month at a glance. Click a month for its detailed page.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 18°1078.8145.9
Feb28° / 17°1028.113.36.7
Mar26° / 15°958.112.37.2
Apr23° / 12°938.211.27.3
May19° / 646.410.26.6
Jun16° / 4359.85.5
Jul15° / 334.7105.2
Aug18° / 514.710.76.6
Sep20° / 666.311.87.0
Oct23° / 11°1229.912.96.9
Nov26° / 14°1018.413.87.2
Dec28° / 16°105914.26.3

Chance of rain

How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.

Rojas gets about 981 mm of precipitation a year. On a typical day the chance of rain is some rain, but that rises and falls sharply with the seasons.

The wetter season lasts 7.0 months, from around Sep 26 to Apr 26, peaking in October at about 32% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Jul 23.

October is the wettest month by volume, with 122 mm over about 10 wet days; July is the driest, with 33 mm.

0%10%20%30%40%JanFebMarAprMayJunJulAugSepOctNovDecwetterdrierwettermostly drysome rainoften wetOct 15 · 32%Jul 23 · 13%
Rain on a day (%)Rain days
Jan299
Feb298
Mar278
Apr278
May206
Jun175
Jul155
Aug165
Sep216
Oct3110
Nov288
Dec299

Monthly rainfall

Over a full year, Rojas collects about 981 mm of rain across 88 wet days — roughly 82 mm in an average month.

It doesn’t fall evenly. October is the wettest month with 122 mm, while July is the driest at just 33 mm. The three wettest months alone bring about 34% of the year’s total.

0255075100125150JanFebMarAprMayJunJulAugSepOctNovDec10710295936443335166122101105
Rainfall (mm)Rain days
Jan1079
Feb1028
Mar958
Apr938
May646
Jun435
Jul335
Aug515
Sep666
Oct12210
Nov1018
Dec1059

Clouds and sunshine

ClearMostly clearPartly cloudyMostly cloudyOvercast

How often the daytime sky is clear, partly cloudy or overcast.

In Rojas, the average share of the sky covered by clouds shows moderate seasonal variation over the course of the year.

The clearer part of the year begins around November 6 and lasts for 5.5 months, ending around April 20. The clearest month is January, when the sky is clear, mostly clear, or partly cloudy 68% of the time on average.

The cloudier part of the year begins around April 21 and lasts for 3.5 months, ending around August 4. The cloudiest month is May, when it is overcast or mostly cloudy 52% of the time.

0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JanFebMarAprMayJunJulAugSepOctNovDecJan 19 · 70%May 23 · 45%clearmostly clearpartly cloudymostly cloudyovercastclearercloudierclearer
Clearer (%)Cloudier (%)
Jan6832
Feb6337
Mar6337
Apr5941
May4852
Jun4951
Jul5347
Aug6040
Sep5842
Oct5347
Nov6040
Dec6535

Daylight, sunrise and sunset

DaylightNight

Hours of daylight through the year, with sunrise and sunset times.

The gold band is daylight — sunrise runs along its lower edge, sunset along the upper — so it widens toward summer and pinches toward winter, with night the dark area above and below. The longest day, around December 13, brings about 14 h 18 min of light; the shortest, around June 14, only 9 h 42 min — a swing of roughly 4 h 36 min.

12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDec
Daylight (h)Sunrise (AM)Sunset (PM)
Jan14.06:118:14
Feb13.36:397:56
Mar12.37:057:21
Apr11.27:296:38
May10.27:526:06
Jun9.88:115:55
Jul10.08:116:06
Aug10.77:466:28
Sep11.87:046:51
Oct12.96:227:14
Nov13.85:547:43
Dec14.25:518:07

Sunny days

How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.

Rojas averages about 14 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 10 and 16 days.

The sunnier stretch runs 5.6 months, from around Nov 9 to Apr 26. The sunniest month is December, with roughly 16 sunny days (bright).

The greyest month is May, down near 11 sunny days — about 29% fewer than the December peak.

05101520JanFebMarAprMayJunJulAugSepOctNovDecsunniergreyersunniergloomymixedbrightDec 1316 daysMay 2410 days
Sunny daysSky
Jan16Bright
Feb14Bright
Mar15Mixed
Apr14Mixed
May11Mixed
Jun11Mixed
Jul13Mixed
Aug14Mixed
Sep13Mixed
Oct12Mixed
Nov14Mixed
Dec16Bright

Humidity comfort

DryComfortableHumidMuggyOppressiveMiserable

Share of days at each humidity comfort level, based on the dew point — the measure that tracks how muggy it actually feels.

Humidity comfort is graded by the dew point — the temperature at which the air would be fully saturated — because it tracks how muggy it actually feels far better than relative humidity does. A low dew point feels dry and crisp; a high one feels sticky and oppressive no matter the reading on a humidity gauge.

In Rojas, how humid it feels changes dramatically over the year.

The more humid part of the year lasts 4.4 months, from around November 26 to April 9. The muggiest month is February, when the air feels humid, muggy or worse about 66% of the time.

The most comfortable stretch runs from around April 10 to November 25, and July is the most comfortable month — the air is dry or comfortable 99% of the time.

0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJul 13 · 99%Feb 6 · 32%oppressivemuggycomfortablehumiddryhumidcomfortablehumid
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
Jan162029297
Feb151831278
Mar262529164
Apr59221361
May7814720
Jun907300
Jul936100
Aug917200
Sep889300
Oct7020910
Nov52291730
Dec292827142

Wind

Average wind speed through the year, banded into plain-language speed zones so a number reads as 'breezy' or 'calm' without knowing the scale.

This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.

Wind in Rojas is steady company: average speeds sit near 13 km/hlight breeze — in every month of the year, with no meaningful windy or calm season.

05101520JanFebMarAprMayJunJulAugSepOctNovDeccalmlight breezeOct 3 · 14 km/hFeb 22 · 11 km/h
Wind speed (km/h)Feels
Jan12calm
Feb12calm
Mar12calm
Apr12light breeze
May12light breeze
Jun13light breeze
Jul13light breeze
Aug14light breeze
Sep14light breeze
Oct14light breeze
Nov14light breeze
Dec13light breeze

Best time to visit Rojas

TravelBeach/poolTemperatureCloudsPrecipitation

To characterize how pleasant the weather is in Rojas throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.

Around mid August, Rojas is still near the start of its best-weather window — great conditions with the peak-season crowds not yet at full swing.

Inferred from the travel-score curve; month-by-month visitor numbers are a planned addition.

The travel score favors clear, rainless days with daytime highs between 18°C and 28°C. Based on this score, the best times of year to visit Rojas for general outdoor tourist activities run from mid January to early June and again from early August to late December, with a peak score in the last week of March.

0246810JanFebMarAprMayJunJulAugSepOctNovDecbest timebest timetravel scoretemperaturecloudsprecipitationMar 29 · 7.4

The travel score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Travel score (0–10)Rating
Jan5.9good
Feb6.7good
Mar7.2good
Apr7.3good
May6.6good
Jun5.5fair
Jul5.2fair
Aug6.5good
Sep6.9good
Oct7.0good
Nov7.1good
Dec6.3good

The beach/pool score favors clear, rainless days with daytime highs between 24°C and 34°C. Based on this score, the best time of year to visit Rojas for hot-weather activities is from late October to early April, with a peak score in the third week of January.

024681012JanFebMarAprMayJunJulAugSepOctNovDecbest timebest timebeach/pool scoretemperaturecloudsprecipitationJan 18 · 7.6

The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

What to pack for Rojas, by month

EssentialRecommendedOptional

Month by month, what's worth putting in the bag — from the temperature range, rain chance, sun and wind. Tap a month for a quick packing note.

For a warm-season trip around January (highs near 29°C), the essentials are light clothes, rain gear and sun protection. In the cold season around July (highs near 15°C), pack a warm layer.

Light clothing
Warm layer
Winter coat
Rain gear
Sun protection
Windbreaker

In January, Rojas 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.

UV index (midday) in Rojas by month

LowModerateHighVery highExtreme

Clear-sky midday UV index through the year, shaded by the WHO exposure levels — how much sun protection each month calls for.

Under clear skies, the midday UV index in Rojas peaks around January 15 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 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 20UV 3
UV index (midday)Level
Jan13Extreme
Feb12Extreme
Mar10Very high
Apr6High
May4Moderate
Jun3Moderate
Jul3Moderate
Aug4Moderate
Sep6High
Oct8Very high
Nov11Extreme
Dec12Extreme

Average hourly UV index in Rojas

LowModerateHighVery highExtreme

Modeled clear-sky UV for every hour of every day — when in the day sun protection actually matters.

The whole year hour by hour: each column is a day, each row an hour, and the color is the modeled clear-sky UV index — the midday peak scaled down as the sun sits lower in the sky. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.

UV falls off far faster than brightness as the sun drops, so even in January the burn window is concentrated in the middle of the day: about 9 hours a day reach index 3 (protection recommended), and 7 hours reach 6 or more. Mornings and late afternoons stay comparatively gentle year round.

JanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM
UV ≥ 3 (h/day)UV ≥ 6 (h/day)
Jan97
Feb8.56.5
Mar7.55
Apr5.51.5
May30
Jun00
Jul10
Aug3.50
Sep61
Oct7.54.5
Nov8.56
Dec97
Almanac & agriculture

Growing season

Chance of a frost-free dayReliably frost-free (≥90%)

Rojas is mild enough that a frost-free day stays more likely than not even in midwinter. Nights are reliably above freezing from about August 8 to June 22 (319 days); outside that window a hard frost is an occasional risk.

0%25%50%75%100%JanFebMarAprMayJunJulAugSepOctNovDecreliably frost-freereliably frost-freeAug 890%Jun 2290%
Frost-free chance (%)Frost nights
Jan1000
Feb1000
Mar1000
Apr1000
May980
Jun926
Jul8631
Aug927
Sep980
Oct1000
Nov1000
Dec1000

Growing degree days

Degree days (base 10°C)Frost-free shaded

Growing degree days tally heat above 10°C: each day adds however many degrees its average temperature runs over that threshold, and cold days add nothing. Rojas banks about 2,540 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around January.

01,0002,000JanFebMarAprMayJunJulAugSepOctNovDec
Growing degree days (°C·days)
Jan412
Feb346
Mar331
Apr222
May123
Jun26
Jul2
Aug61
Sep124
Oct216
Nov296
Dec381

Solar energy

Average daily shortwave solar energy reaching the ground, banded into brightness zones so the number means something at a glance.

Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.

Rojas receives about 4.8 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 2.3 and 7.4 kWh/m².

The brighter stretch of the year lasts 6.0 months, from around Sep 20 to Mar 20. The brightest month is December, averaging about 7.4 kWh/m² (intense).

The dimmest month is June, down near 2.3 kWh/m² — roughly 68% less than the December peak.

012345678JanFebMarAprMayJunJulAugSepOctNovDecbrighterdimmerbrighterdimmoderatebrightintenseDec 127.4 kWhJun 172.3 kWh
Solar energy (kWh/m²)Level
Jan7.3Intense
Feb6.3Intense
Mar5.0Bright
Apr3.7Moderate
May2.7Moderate
Jun2.3Moderate
Jul2.5Moderate
Aug3.6Moderate
Sep4.7Bright
Oct5.6Bright
Nov6.9Intense
Dec7.4Intense

Where is Rojas?

Rojas sits at 34.2°S, 60.7°W, 56 m above sea level, in Argentina. The nearest listed city is Pergamino, 37 km away.

Topography around Rojas

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

Within 3 km, the terrain around Rojas has only modest variations in elevation — a maximum elevation change of 20 m around an average of 65 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 43 m; within 80 km, only modest variations in elevation — a maximum elevation change of 112 m.

The land around Rojas is covered by cropland (63%) within 3 km, cropland (91%) within 16 km, and cropland (90%) within 80 km.

3 km
20 m
16 km
43 m
80 km
112 m
treesgrasslandcroplandartificial surfaceswater
Nearby: Pergamino 37 km · Salto 45 km · Colón 47 km · Junín 48 km · Chacabuco 55 km · Arrecifes 60 km · Carmen de Areco 86 km · Los Toldos 93 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 Rojas (-34.1977°, -60.7337°, elevation 56 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).