Climate and average weather in Trelew
In Trelew, the summers are warm, fairly dry, and mostly clear and the winters are cool and mostly clear.
Over the course of the year, the temperature in Trelew typically varies from 3°C to 28°C, and is rarely below -3°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 Trelew for warm-weather activities are from early January to early May and late September to late December.
- Hottest
- Jan
- 28°
- Coldest
- Jul
- 3°
- Wettest
- May
- 23 mm
- Driest
- Aug
- 14 mm
- Rain / yr
- 220 mm
- 42 wet days
- Daylight
- 8.8–15.2 h
- shortest–longest
- Elevation
- 14 m
- 43.2°S
- Clearest
- Feb
- 35% cloud
Trelew is city in Argentina.
- Density
- 393/km²
- people per km²
- Founded
- 1886
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Trelew 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 early May.
Temperature through the year
Daily average highs and lows in Trelew, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
The hot season lasts 4.0 months, from November 18 to March 18, with daily high temperatures above 24°C. The hottest month of the year in Trelew is January, with an average high of 28°C and low of 16°C.
The cool season lasts 3.1 months, from May 21 to August 23, with daily high temperatures below 15°C. The coldest month of the year in Trelew is July, with an average low of 3°C and high of 12°C.
Days typically run about 11°C warmer than nights, with the widest day–night swing (around 12°C) in January.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 28 | 27 | 24 | 20 | 16 | 12 | 12 | 14 | 17 | 20 | 23 | 26 |
| Avg low (°C) | 16 | 15 | 13 | 10 | 6 | 3 | 3 | 4 | 6 | 9 | 12 | 14 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 28 | 16 |
| Feb | 27 | 15 |
| Mar | 24 | 13 |
| Apr | 20 | 10 |
| May | 16 | 6 |
| Jun | 12 | 3 |
| Jul | 12 | 3 |
| Aug | 14 | 4 |
| Sep | 17 | 6 |
| Oct | 20 | 9 |
| Nov | 23 | 12 |
| Dec | 26 | 14 |
How hot and cold Trelew 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 -2°C (around July 9), with roughly 69 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 | 26 | 24 | 20 | 16 | 12 | 12 | 14 | 17 | 20 | 23 | 26 |
| Air high (°C) | 28 | 27 | 24 | 20 | 16 | 12 | 12 | 14 | 17 | 20 | 23 | 26 |
| Feels-like low (°C) | 16 | 15 | 13 | 8 | 3 | -1 | -2 | 0 | 3 | 6 | 12 | 14 |
| Air low (°C) | 16 | 15 | 13 | 10 | 6 | 3 | 3 | 4 | 6 | 9 | 12 | 14 |
| Feels-like high (°C) | Air high (°C) | Feels-like low (°C) | Air low (°C) | |
|---|---|---|---|---|
| Jan | 28 | 28 | 16 | 16 |
| Feb | 26 | 27 | 15 | 15 |
| Mar | 24 | 24 | 13 | 13 |
| Apr | 20 | 20 | 8 | 10 |
| May | 16 | 16 | 3 | 6 |
| Jun | 12 | 12 | -1 | 3 |
| Jul | 12 | 12 | -2 | 3 |
| Aug | 14 | 14 | 0 | 4 |
| Sep | 17 | 17 | 3 | 6 |
| Oct | 20 | 20 | 6 | 9 |
| Nov | 23 | 23 | 12 | 12 |
| Dec | 26 | 26 | 14 | 14 |
Average hourly temperature in Trelew
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 3°C.
Trelew 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° / 16° | 15 | 3 | 14.8 | 7.9 |
| Feb | 27° / 15° | 22 | 3.7 | 13.8 | 8.0 |
| Mar | 24° / 13° | 21 | 3.5 | 12.4 | 8.2 |
| Apr | 20° / 10° | 19 | 2.9 | 10.8 | 7.6 |
| May | 16° / 6° | 23 | 4 | 9.5 | 5.6 |
| Jun | 12° / 3° | 23 | 4.1 | 8.9 | 3.8 |
| Jul | 12° / 3° | 14 | 3.5 | 9.1 | 3.7 |
| Aug | 14° / 4° | 14 | 3.4 | 10.2 | 4.9 |
| Sep | 17° / 6° | 18 | 4 | 11.7 | 6.2 |
| Oct | 20° / 9° | 18 | 4.1 | 13.2 | 7.4 |
| Nov | 23° / 12° | 16 | 3.2 | 14.5 | 8.2 |
| Dec | 26° / 14° | 18 | 3 | 15.1 | 8.1 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Trelew gets about 220 mm of precipitation a year. On a typical day the chance of rain is mostly dry, and that barely changes with the seasons — rain is spread fairly evenly through the year.
May is the wettest month by volume, with 23 mm over about 4 wet days; August is the driest, with 14 mm.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 10 | 13 | 11 | 10 | 13 | 14 | 12 | 11 | 13 | 13 | 11 | 10 |
| Rain days | 3 | 4 | 4 | 3 | 4 | 4 | 4 | 3 | 4 | 4 | 3 | 3 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 10 | 3 |
| Feb | 13 | 4 |
| Mar | 11 | 4 |
| Apr | 10 | 3 |
| May | 13 | 4 |
| Jun | 14 | 4 |
| Jul | 12 | 4 |
| Aug | 11 | 3 |
| Sep | 13 | 4 |
| Oct | 13 | 4 |
| Nov | 11 | 3 |
| Dec | 10 | 3 |
Monthly rainfall
Over a full year, Trelew collects about 220 mm of rain across 42 wet days — roughly 18 mm in an average month.
It doesn’t fall evenly. May is the wettest month with 23 mm, while August is the driest at just 14 mm. The three wettest months alone bring about 31% of the year’s total.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (mm) | 15 | 22 | 21 | 19 | 23 | 23 | 14 | 14 | 18 | 18 | 16 | 18 |
| Rain days | 3 | 4 | 4 | 3 | 4 | 4 | 4 | 3 | 4 | 4 | 3 | 3 |
| Rainfall (mm) | Rain days | |
|---|---|---|
| Jan | 15 | 3 |
| Feb | 22 | 4 |
| Mar | 21 | 4 |
| Apr | 19 | 3 |
| May | 23 | 4 |
| Jun | 23 | 4 |
| Jul | 14 | 4 |
| Aug | 14 | 3 |
| Sep | 18 | 4 |
| Oct | 18 | 4 |
| Nov | 16 | 3 |
| Dec | 18 | 3 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Trelew, 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 18 and lasts for 5.1 months, ending around April 22. The clearest month is January, when the sky is clear, mostly clear, or partly cloudy 78% of the time on average.
The cloudier part of the year begins around April 23 and lasts for 6.9 months, ending around November 17. The cloudiest month is May, when it is overcast or mostly cloudy 45% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 78 | 78 | 73 | 68 | 55 | 60 | 60 | 59 | 63 | 62 | 66 | 72 |
| Cloudier (%) | 22 | 22 | 27 | 32 | 45 | 40 | 40 | 41 | 37 | 38 | 34 | 28 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 78 | 22 |
| Feb | 78 | 22 |
| Mar | 73 | 27 |
| Apr | 68 | 32 |
| May | 55 | 45 |
| Jun | 60 | 40 |
| Jul | 60 | 40 |
| Aug | 59 | 41 |
| Sep | 63 | 37 |
| Oct | 62 | 38 |
| Nov | 66 | 34 |
| Dec | 72 | 28 |
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 January 1, brings about 15 h 12 min of light; the shortest, around June 13, only 8 h 48 min — a swing of roughly 6 h 24 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 14.8 | 13.8 | 12.4 | 10.8 | 9.5 | 8.9 | 9.1 | 10.2 | 11.7 | 13.2 | 14.5 | 15.1 |
| Sunrise (AM) | 6:04 | 6:43 | 7:20 | 7:57 | 8:32 | 8:57 | 8:54 | 8:19 | 7:24 | 6:30 | 5:51 | 5:42 |
| Sunset (PM) | 8:57 | 8:29 | 7:42 | 6:46 | 6:03 | 5:46 | 6:00 | 6:32 | 7:07 | 7:42 | 8:22 | 8:53 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 14.8 | 6:04 | 8:57 |
| Feb | 13.8 | 6:43 | 8:29 |
| Mar | 12.4 | 7:20 | 7:42 |
| Apr | 10.8 | 7:57 | 6:46 |
| May | 9.5 | 8:32 | 6:03 |
| Jun | 8.9 | 8:57 | 5:46 |
| Jul | 9.1 | 8:54 | 6:00 |
| Aug | 10.2 | 8:19 | 6:32 |
| Sep | 11.7 | 7:24 | 7:07 |
| Oct | 13.2 | 6:30 | 7:42 |
| Nov | 14.5 | 5:51 | 8:22 |
| Dec | 15.1 | 5:42 | 8:53 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Trelew averages about 15 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 12 and 19 days.
The sunnier stretch runs 4.2 months, from around Dec 18 to Apr 25. The sunniest month is February, with roughly 18 sunny days (bright).
The greyest month is October, down near 13 sunny days — about 28% fewer than the February peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 18 | 17 | 17 | 15 | 13 | 14 | 14 | 14 | 13 | 13 | 13 | 15 |
| Sky | Bright | Bright | Bright | Bright | Mixed | Mixed | Mixed | Mixed | Mixed | Mixed | Mixed | Mixed |
| Sunny days | Sky | |
|---|---|---|
| Jan | 18 | Bright |
| Feb | 17 | Bright |
| Mar | 17 | Bright |
| Apr | 15 | Bright |
| May | 13 | Mixed |
| Jun | 14 | Mixed |
| Jul | 14 | Mixed |
| Aug | 14 | Mixed |
| Sep | 13 | Mixed |
| Oct | 13 | Mixed |
| Nov | 13 | Mixed |
| Dec | 15 | Mixed |
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 Trelew, the air stays dry or comfortable essentially all year. Even in February, the muggiest month, it feels humid or worse only about 2% of the time — humidity is not something you need to plan around here.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 94 | 91 | 94 | 99 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 97 |
| Comfortable (%) | 5 | 7 | 5 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 |
| Humid (%) | 1 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | |
|---|---|---|---|
| Jan | 94 | 5 | 1 |
| Feb | 91 | 7 | 2 |
| Mar | 94 | 5 | 2 |
| Apr | 99 | 1 | 0 |
| May | 100 | 0 | 0 |
| Jun | 100 | 0 | 0 |
| Jul | 100 | 0 | 0 |
| Aug | 100 | 0 | 0 |
| Sep | 100 | 0 | 0 |
| Oct | 100 | 0 | 0 |
| Nov | 100 | 0 | 0 |
| Dec | 97 | 3 | 0 |
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.
Across the year, average wind speed in Trelew is typically light breeze, near 18 km/h, and varies little with the seasons.
The windier part of the year lasts 5.0 months, from around Oct 1 to Feb 28. The windiest month is December, averaging about 20 km/h (breezy).
The calmer part of the year runs from around Mar 1 to Sep 30, with May the calmest month at about 17 km/h.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 20 | 19 | 18 | 17 | 17 | 17 | 17 | 18 | 18 | 19 | 20 | 20 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | breezy |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 20 | light breeze |
| Feb | 19 | light breeze |
| Mar | 18 | light breeze |
| Apr | 17 | light breeze |
| May | 17 | light breeze |
| Jun | 17 | light breeze |
| Jul | 17 | light breeze |
| Aug | 18 | light breeze |
| Sep | 18 | light breeze |
| Oct | 19 | light breeze |
| Nov | 20 | light breeze |
| Dec | 20 | breezy |
Best time to visit Trelew
To characterize how pleasant the weather is in Trelew throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around mid January, Trelew 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 Trelew for general outdoor tourist activities is from late September to early May, with a peak score in the last week of November.
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) | 7.9 | 8.0 | 8.2 | 7.6 | 5.6 | 3.8 | 3.7 | 4.9 | 6.2 | 7.4 | 8.1 | 8.1 |
| Rating | ideal | ideal | ideal | ideal | good | fair | fair | fair | good | good | ideal | ideal |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 7.9 | ideal |
| Feb | 8.0 | ideal |
| Mar | 8.2 | ideal |
| Apr | 7.6 | ideal |
| May | 5.6 | good |
| Jun | 3.8 | fair |
| Jul | 3.7 | fair |
| Aug | 4.9 | fair |
| Sep | 6.2 | good |
| Oct | 7.4 | good |
| Nov | 8.1 | ideal |
| Dec | 8.1 | ideal |
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 Trelew for hot-weather activities is from mid 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 Trelew, 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 and sun protection. In the cold season around July (highs near 12°C), pack a warm layer.
In January, Trelew sees daytime highs around 28°C and nights near 16°C. Pack light clothes and sun protection. About 3 days see rain.
Sea temperature near Trelew
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 38 km away) is warmest in February at about 17°C and coldest in August near 9°C.
The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 17 | 17 | 17 | 15 | 13 | 12 | 10 | 9 | 9 | 11 | 13 | 15 |
| Comfort | Cool | Cool | Cool | Cool | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 17 | Cool |
| Feb | 17 | Cool |
| Mar | 17 | Cool |
| Apr | 15 | Cool |
| May | 13 | Bracing |
| Jun | 12 | Bracing |
| Jul | 10 | Bracing |
| Aug | 9 | Bracing |
| Sep | 9 | Bracing |
| Oct | 11 | Bracing |
| Nov | 13 | Bracing |
| Dec | 15 | Bracing |
UV index (midday) in Trelew 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 Trelew peaks around December 22 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 11 | 10 | 7 | 4 | 2 | 1 | 2 | 2 | 4 | 7 | 9 | 12 |
| Level | Extreme | Extreme | High | Moderate | Moderate | Low | Low | Moderate | Moderate | High | Very high | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 11 | Extreme |
| Feb | 10 | Extreme |
| Mar | 7 | High |
| Apr | 4 | Moderate |
| May | 2 | Moderate |
| Jun | 1 | Low |
| Jul | 2 | Low |
| Aug | 2 | Moderate |
| Sep | 4 | Moderate |
| Oct | 7 | High |
| Nov | 9 | Very high |
| Dec | 12 | Extreme |
Average hourly UV index in Trelew
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 | 6.5 | 3.5 | 0 | 0 | 0 | 0 | 4 | 6.5 | 8 | 9.5 |
| UV ≥ 6 (h/day) | 6.5 | 5.5 | 2.5 | 0 | 0 | 0 | 0 | 0 | 0 | 2.5 | 5 | 7 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 9 | 6.5 |
| Feb | 8 | 5.5 |
| Mar | 6.5 | 2.5 |
| Apr | 3.5 | 0 |
| May | 0 | 0 |
| Jun | 0 | 0 |
| Jul | 0 | 0 |
| Aug | 0 | 0 |
| Sep | 4 | 0 |
| Oct | 6.5 | 2.5 |
| Nov | 8 | 5 |
| Dec | 9.5 | 7 |
Growing season
Trelew is mild enough that a frost-free day stays more likely than not even in midwinter. Nights are reliably above freezing from about August 23 to May 28 (279 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 | 96 | 81 | 76 | 88 | 97 | 100 | 100 | 100 |
| Frost nights | 0 | 0 | 0 | 0 | 3 | 30 | 31 | 22 | 0 | 0 | 0 | 0 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 100 | 0 |
| Feb | 100 | 0 |
| Mar | 100 | 0 |
| Apr | 100 | 0 |
| May | 96 | 3 |
| Jun | 81 | 30 |
| Jul | 76 | 31 |
| Aug | 88 | 22 |
| Sep | 97 | 0 |
| Oct | 100 | 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. Trelew banks about 1,823 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) | 359 | 301 | 269 | 145 | 34 | 0 | 0 | 0 | 42 | 143 | 224 | 308 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 359 |
| Feb | 301 |
| Mar | 269 |
| Apr | 145 |
| May | 34 |
| Jun | 0 |
| Jul | 0 |
| Aug | 0 |
| Sep | 42 |
| Oct | 143 |
| Nov | 224 |
| Dec | 308 |
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.
Trelew receives about 4.7 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 1.6 and 8.1 kWh/m².
The brighter stretch of the year lasts 5.8 months, from around Sep 25 to Mar 19. The brightest month is December, averaging about 8.1 kWh/m² (intense).
The dimmest month is June, down near 1.6 kWh/m² — roughly 80% less than the December peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 7.8 | 6.5 | 5.0 | 3.3 | 2.1 | 1.6 | 1.9 | 2.8 | 4.3 | 6.0 | 7.4 | 8.1 |
| Level | Intense | Intense | Bright | Moderate | Moderate | Dim | Dim | Moderate | Bright | Bright | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 7.8 | Intense |
| Feb | 6.5 | Intense |
| Mar | 5.0 | Bright |
| Apr | 3.3 | Moderate |
| May | 2.1 | Moderate |
| Jun | 1.6 | Dim |
| Jul | 1.9 | Dim |
| Aug | 2.8 | Moderate |
| Sep | 4.3 | Bright |
| Oct | 6.0 | Bright |
| Nov | 7.4 | Intense |
| Dec | 8.1 | Intense |
Where is Trelew?
Trelew sits at 43.2°S, 65.3°W, 14 m above sea level, in Argentina. The nearest listed city is Rawson, 17 km away.
Topography around Trelew
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Trelew.
Within 3 km, the terrain around Trelew has only modest variations in elevation — a maximum elevation change of 35 m around an average of 19 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 205 m; within 80 km, significant variations in elevation — a maximum elevation change of 336 m.
The land around Trelew is covered by artificial surfaces (51%), grassland (22%) and shrubs (20%) within 3 km, shrubs (67%) and grassland (20%) within 16 km, and shrubs (65%) and water (25%) 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 Trelew (-43.249°, -65.305°, elevation 14 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).