Climate and average weather in Tres Arroyos
In Tres Arroyos, the summers are hot, showery, and mostly clear and the winters are cool and partly cloudy.
Over the course of the year, the temperature in Tres Arroyos typically varies from 4°C to 28°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 Tres Arroyos for warm-weather activities are from early January to mid May and late September to late December.
- Hottest
- Jan
- 28°
- Coldest
- Jul
- 4°
- Wettest
- Nov
- 83 mm
- Driest
- Jun
- 33 mm
- Rain / yr
- 742 mm
- 91 wet days
- Daylight
- 9.3–14.7 h
- shortest–longest
- Elevation
- 100 m
- 38.4°S
- Clearest
- Jan
- 39% cloud
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.
Tres Arroyos 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 January to mid May.
Temperature through the year
Daily average highs and lows in Tres Arroyos, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
The hot season lasts 3.6 months, from November 26 to March 16, with daily high temperatures above 24°C. The hottest month of the year in Tres Arroyos is January, with an average high of 28°C and low of 15°C.
The cool season lasts 3.1 months, from May 23 to August 25, with daily high temperatures below 16°C. The coldest month of the year in Tres Arroyos is July, with an average low of 4°C and high of 13°C.
Days typically run about 11°C warmer than nights, with the widest day–night swing (around 13°C) in December.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 28 | 27 | 25 | 21 | 17 | 13 | 13 | 15 | 17 | 20 | 23 | 27 |
| Avg low (°C) | 15 | 15 | 13 | 10 | 7 | 4 | 4 | 5 | 6 | 9 | 11 | 14 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 28 | 15 |
| Feb | 27 | 15 |
| Mar | 25 | 13 |
| Apr | 21 | 10 |
| May | 17 | 7 |
| Jun | 13 | 4 |
| Jul | 13 | 4 |
| Aug | 15 | 5 |
| Sep | 17 | 6 |
| Oct | 20 | 9 |
| Nov | 23 | 11 |
| Dec | 27 | 14 |
How hot and cold Tres Arroyos really feels
The felt-temperature range through the year — heat index on the day's high (summer humidity), wind chill on the night's low (winter wind). The dashed lines are the plain thermometer; the gap is how much hotter or colder it really feels.
On the coldest nights, wind chill pulls the feels-like down to about -0°C (around July 11), with roughly 31 freezing days a year (feels-like at or below 0°C), worst in July.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°C) | 28 | 27 | 25 | 21 | 17 | 13 | 13 | 15 | 17 | 20 | 23 | 27 |
| Air high (°C) | 28 | 27 | 25 | 21 | 17 | 13 | 13 | 15 | 17 | 20 | 23 | 27 |
| Feels-like low (°C) | 15 | 15 | 13 | 9 | 4 | 1 | 0 | 1 | 3 | 6 | 10 | 14 |
| Air low (°C) | 15 | 15 | 13 | 10 | 7 | 4 | 4 | 5 | 6 | 9 | 11 | 14 |
| Feels-like high (°C) | Air high (°C) | Feels-like low (°C) | Air low (°C) | |
|---|---|---|---|---|
| Jan | 28 | 28 | 15 | 15 |
| Feb | 27 | 27 | 15 | 15 |
| Mar | 25 | 25 | 13 | 13 |
| Apr | 21 | 21 | 9 | 10 |
| May | 17 | 17 | 4 | 7 |
| Jun | 13 | 13 | 1 | 4 |
| Jul | 13 | 13 | 0 | 4 |
| Aug | 15 | 15 | 1 | 5 |
| Sep | 17 | 17 | 3 | 6 |
| Oct | 20 | 20 | 6 | 9 |
| Nov | 23 | 23 | 10 | 11 |
| Dec | 27 | 27 | 14 | 14 |
Average hourly temperature in Tres Arroyos
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 28°C, and coldest before dawn in July, near 4°C.
Tres Arroyos weather by month
Every month at a glance. Click a month for its detailed page.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 28° / 15° | 74 | 9.7 | 14.4 | 6.1 |
| Feb | 27° / 15° | 75 | 8.3 | 13.5 | 6.9 |
| Mar | 25° / 13° | 76 | 8.2 | 12.3 | 7.4 |
| Apr | 21° / 10° | 64 | 7.2 | 11 | 6.9 |
| May | 17° / 7° | 46 | 6.2 | 9.9 | 5.7 |
| Jun | 13° / 4° | 33 | 5.2 | 9.4 | 4.2 |
| Jul | 13° / 4° | 38 | 6.1 | 9.6 | 3.8 |
| Aug | 15° / 5° | 47 | 5.8 | 10.5 | 4.9 |
| Sep | 17° / 6° | 51 | 6.9 | 11.7 | 5.8 |
| Oct | 20° / 9° | 78 | 9.4 | 13 | 6.4 |
| Nov | 23° / 11° | 83 | 9.3 | 14.1 | 7.1 |
| Dec | 27° / 14° | 78 | 8.8 | 14.6 | 6.9 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Tres Arroyos gets about 742 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 5.9 months, from around Sep 25 to Mar 22, peaking in November at about 33% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Jun 8.
November is the wettest month by volume, with 83 mm over about 9 wet days; June is the driest, with 33 mm.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 31 | 30 | 27 | 23 | 20 | 18 | 20 | 19 | 23 | 31 | 31 | 28 |
| Rain days | 10 | 8 | 8 | 7 | 6 | 5 | 6 | 6 | 7 | 9 | 9 | 9 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 31 | 10 |
| Feb | 30 | 8 |
| Mar | 27 | 8 |
| Apr | 23 | 7 |
| May | 20 | 6 |
| Jun | 18 | 5 |
| Jul | 20 | 6 |
| Aug | 19 | 6 |
| Sep | 23 | 7 |
| Oct | 31 | 9 |
| Nov | 31 | 9 |
| Dec | 28 | 9 |
Monthly rainfall
Over a full year, Tres Arroyos collects about 742 mm of rain across 91 wet days — roughly 62 mm in an average month.
It doesn’t fall evenly. November is the wettest month with 83 mm, while June is the driest at just 33 mm. The three wettest months alone bring about 32% of the year’s total.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (mm) | 74 | 75 | 76 | 64 | 46 | 33 | 38 | 47 | 51 | 78 | 83 | 78 |
| Rain days | 10 | 8 | 8 | 7 | 6 | 5 | 6 | 6 | 7 | 9 | 9 | 9 |
| Rainfall (mm) | Rain days | |
|---|---|---|
| Jan | 74 | 10 |
| Feb | 75 | 8 |
| Mar | 76 | 8 |
| Apr | 64 | 7 |
| May | 46 | 6 |
| Jun | 33 | 5 |
| Jul | 38 | 6 |
| Aug | 47 | 6 |
| Sep | 51 | 7 |
| Oct | 78 | 9 |
| Nov | 83 | 9 |
| Dec | 78 | 9 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Tres Arroyos, 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 October 29 and lasts for 5.7 months, ending around April 21. The clearest month is January, when the sky is clear, mostly clear, or partly cloudy 71% of the time on average.
The cloudier part of the year begins around April 22 and lasts for 6.2 months, ending around October 28. The cloudiest month is May, when it is overcast or mostly cloudy 54% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 71 | 66 | 64 | 57 | 46 | 47 | 47 | 49 | 49 | 51 | 63 | 70 |
| Cloudier (%) | 29 | 34 | 36 | 43 | 54 | 53 | 53 | 51 | 51 | 49 | 37 | 30 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 71 | 29 |
| Feb | 66 | 34 |
| Mar | 64 | 36 |
| Apr | 57 | 43 |
| May | 46 | 54 |
| Jun | 47 | 53 |
| Jul | 47 | 53 |
| Aug | 49 | 51 |
| Sep | 49 | 51 |
| Oct | 51 | 49 |
| Nov | 63 | 37 |
| Dec | 70 | 30 |
Daylight, sunrise and sunset
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 15, brings about 14 h 42 min of light; the shortest, around June 15, only 9 h 18 min — a swing of roughly 5 h 24 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 14.4 | 13.5 | 12.3 | 11.0 | 9.9 | 9.4 | 9.6 | 10.5 | 11.7 | 13.0 | 14.1 | 14.6 |
| Sunrise (AM) | 5:58 | 6:31 | 7:02 | 7:31 | 8:00 | 8:21 | 8:20 | 7:50 | 7:03 | 6:16 | 5:43 | 5:37 |
| Sunset (PM) | 8:22 | 8:00 | 7:20 | 6:31 | 5:55 | 5:42 | 5:54 | 6:20 | 6:48 | 7:17 | 7:50 | 8:17 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 14.4 | 5:58 | 8:22 |
| Feb | 13.5 | 6:31 | 8:00 |
| Mar | 12.3 | 7:02 | 7:20 |
| Apr | 11.0 | 7:31 | 6:31 |
| May | 9.9 | 8:00 | 5:55 |
| Jun | 9.4 | 8:21 | 5:42 |
| Jul | 9.6 | 8:20 | 5:54 |
| Aug | 10.5 | 7:50 | 6:20 |
| Sep | 11.7 | 7:03 | 6:48 |
| Oct | 13.0 | 6:16 | 7:17 |
| Nov | 14.1 | 5:43 | 7:50 |
| Dec | 14.6 | 5:37 | 8:17 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Tres Arroyos averages about 13 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 9 and 17 days.
The sunnier stretch runs 5.1 months, from around Nov 4 to Apr 7. The sunniest month is January, with roughly 17 sunny days (bright).
The greyest month is May, down near 10 sunny days — about 43% fewer than the January peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 17 | 15 | 15 | 12 | 10 | 10 | 11 | 11 | 11 | 12 | 14 | 17 |
| Sky | Bright | Bright | Mixed | Mixed | Mixed | Mixed | Mixed | Mixed | Mixed | Mixed | Mixed | Bright |
| Sunny days | Sky | |
|---|---|---|
| Jan | 17 | Bright |
| Feb | 15 | Bright |
| Mar | 15 | Mixed |
| Apr | 12 | Mixed |
| May | 10 | Mixed |
| Jun | 10 | Mixed |
| Jul | 11 | Mixed |
| Aug | 11 | Mixed |
| Sep | 11 | Mixed |
| Oct | 12 | Mixed |
| Nov | 14 | Mixed |
| Dec | 17 | Bright |
Humidity comfort
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 Tres Arroyos, how humid it feels changes noticeably over the year.
The more humid part of the year lasts 4.0 months, from around December 5 to April 6. The muggiest month is February, when the air feels humid, muggy or worse about 28% of the time.
The most comfortable stretch runs from around April 7 to December 4, and August is the most comfortable month — the air is dry or comfortable 100% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 51 | 45 | 55 | 81 | 92 | 99 | 99 | 99 | 98 | 92 | 81 | 67 |
| Comfortable (%) | 26 | 27 | 24 | 14 | 7 | 1 | 1 | 1 | 2 | 8 | 15 | 21 |
| Humid (%) | 19 | 20 | 17 | 4 | 2 | 0 | 0 | 0 | 1 | 1 | 4 | 10 |
| Muggy (%) | 5 | 8 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| Jan | 51 | 26 | 19 | 5 |
| Feb | 45 | 27 | 20 | 8 |
| Mar | 55 | 24 | 17 | 3 |
| Apr | 81 | 14 | 4 | 1 |
| May | 92 | 7 | 2 | 0 |
| Jun | 99 | 1 | 0 | 0 |
| Jul | 99 | 1 | 0 | 0 |
| Aug | 99 | 1 | 0 | 0 |
| Sep | 98 | 2 | 1 | 0 |
| Oct | 92 | 8 | 1 | 0 |
| Nov | 81 | 15 | 4 | 0 |
| Dec | 67 | 21 | 10 | 2 |
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 Tres Arroyos is steady company: average speeds sit near 16 km/h — light breeze — in every month of the year, with no meaningful windy or calm season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 16 | 15 | 15 | 15 | 15 | 16 | 16 | 16 | 16 | 16 | 16 | 17 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 16 | light breeze |
| Feb | 15 | light breeze |
| Mar | 15 | light breeze |
| Apr | 15 | light breeze |
| May | 15 | light breeze |
| Jun | 16 | light breeze |
| Jul | 16 | light breeze |
| Aug | 16 | light breeze |
| Sep | 16 | light breeze |
| Oct | 16 | light breeze |
| Nov | 16 | light breeze |
| Dec | 17 | light breeze |
Best time to visit Tres Arroyos
To characterize how pleasant the weather is in Tres Arroyos throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around mid January, Tres Arroyos 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 time of year to visit Tres Arroyos for general outdoor tourist activities is from late September to mid May, with a peak score in the last week of March.
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).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Travel score (0–10) | 6.2 | 6.8 | 7.3 | 7.0 | 5.7 | 4.2 | 3.8 | 4.9 | 5.8 | 6.4 | 7.1 | 6.9 |
| Rating | good | good | good | good | good | fair | fair | fair | good | good | good | good |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 6.2 | good |
| Feb | 6.8 | good |
| Mar | 7.3 | good |
| Apr | 7.0 | good |
| May | 5.7 | good |
| Jun | 4.2 | fair |
| Jul | 3.8 | fair |
| Aug | 4.9 | fair |
| Sep | 5.8 | good |
| Oct | 6.4 | good |
| Nov | 7.1 | good |
| Dec | 6.9 | good |
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 Tres Arroyos for hot-weather activities is from late November to late March, with a peak score in the third week of January.
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 Tres Arroyos, by month
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 28°C), the essentials are light clothes, rain gear and sun protection. In the cold season around July (highs near 13°C), pack a warm layer.
In January, Tres Arroyos sees daytime highs around 28°C and nights near 15°C. Pack light clothes and sun protection. Worth having: rain gear. About 10 days see rain.
Sea temperature near Tres Arroyos
Average ocean temperature at the nearest coast, month by month, banded into swim-comfort zones — the other half of the beach question.
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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 21 | 21 | 20 | 18 | 15 | 12 | 10 | 10 | 11 | 13 | 16 | 18 |
| Comfort | Refreshing | Refreshing | Refreshing | Cool | Cool | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 21 | Refreshing |
| Feb | 21 | Refreshing |
| Mar | 20 | Refreshing |
| Apr | 18 | Cool |
| May | 15 | Cool |
| Jun | 12 | Bracing |
| Jul | 10 | Bracing |
| Aug | 10 | Bracing |
| Sep | 11 | Bracing |
| Oct | 13 | Bracing |
| Nov | 16 | Cool |
| Dec | 18 | Cool |
UV index (midday) in Tres Arroyos by month
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 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 12 | 12 | 8 | 6 | 3 | 2 | 2 | 3 | 5 | 7 | 10 | 13 |
| Level | Extreme | Extreme | Very high | High | Moderate | Low | Moderate | Moderate | Moderate | Very high | Very high | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 12 | Extreme |
| Feb | 12 | Extreme |
| Mar | 8 | Very high |
| Apr | 6 | High |
| May | 3 | Moderate |
| Jun | 2 | Low |
| Jul | 2 | Moderate |
| Aug | 3 | Moderate |
| Sep | 5 | Moderate |
| Oct | 7 | Very high |
| Nov | 10 | Very high |
| Dec | 13 | Extreme |
Average hourly UV index in Tres Arroyos
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 December the burn window is concentrated in the middle of the day: about 9.5 hours a day reach index 3 (protection recommended), and 7 hours reach 6 or more. Mornings and late afternoons stay comparatively gentle year round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV ≥ 3 (h/day) | 9 | 8.5 | 7 | 5.5 | 1.5 | 0 | 0 | 0 | 4.5 | 7 | 8.5 | 9.5 |
| UV ≥ 6 (h/day) | 6.5 | 6.5 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 3.5 | 6 | 7 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 9 | 6.5 |
| Feb | 8.5 | 6.5 |
| Mar | 7 | 4 |
| Apr | 5.5 | 0 |
| May | 1.5 | 0 |
| Jun | 0 | 0 |
| Jul | 0 | 0 |
| Aug | 0 | 0 |
| Sep | 4.5 | 0 |
| Oct | 7 | 3.5 |
| Nov | 8.5 | 6 |
| Dec | 9.5 | 7 |
Growing season
Tres Arroyos is mild enough that a frost-free day stays more likely than not even in midwinter. Nights are reliably above freezing from about August 20 to June 15 (300 days); outside that window a hard frost is an occasional risk.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 100 | 100 | 100 | 100 | 97 | 90 | 83 | 89 | 95 | 99 | 100 | 100 |
| Frost nights | 0 | 0 | 0 | 0 | 0 | 17 | 31 | 21 | 0 | 0 | 0 | 0 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 100 | 0 |
| Feb | 100 | 0 |
| Mar | 100 | 0 |
| Apr | 100 | 0 |
| May | 97 | 0 |
| Jun | 90 | 17 |
| Jul | 83 | 31 |
| Aug | 89 | 21 |
| Sep | 95 | 0 |
| Oct | 99 | 0 |
| Nov | 100 | 0 |
| Dec | 100 | 0 |
Growing degree days
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. Tres Arroyos banks about 1,880 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around January.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°C·days) | 369 | 313 | 279 | 159 | 58 | 0 | 0 | 4 | 42 | 127 | 211 | 319 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 369 |
| Feb | 313 |
| Mar | 279 |
| Apr | 159 |
| May | 58 |
| Jun | 0 |
| Jul | 0 |
| Aug | 4 |
| Sep | 42 |
| Oct | 127 |
| Nov | 211 |
| Dec | 319 |
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.
Tres Arroyos receives about 4.7 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 1.9 and 7.8 kWh/m².
The brighter stretch of the year lasts 5.7 months, from around Sep 26 to Mar 19. The brightest month is December, averaging about 7.7 kWh/m² (intense).
The dimmest month is June, down near 2.0 kWh/m² — roughly 75% less than the December peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 7.6 | 6.4 | 4.9 | 3.5 | 2.4 | 1.9 | 2.2 | 3.0 | 4.3 | 5.6 | 7.0 | 7.8 |
| Level | Intense | Intense | Bright | Moderate | Moderate | Dim | Moderate | Moderate | Bright | Bright | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 7.6 | Intense |
| Feb | 6.4 | Intense |
| Mar | 4.9 | Bright |
| Apr | 3.5 | Moderate |
| May | 2.4 | Moderate |
| Jun | 1.9 | Dim |
| Jul | 2.2 | Moderate |
| Aug | 3.0 | Moderate |
| Sep | 4.3 | Bright |
| Oct | 5.6 | Bright |
| Nov | 7.0 | Intense |
| Dec | 7.8 | Intense |
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.
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
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).