Climate and average weather in Castro
In Castro, the summers are warm, wet, and mostly cloudy and the winters are mild and mostly clear.
Over the course of the year, the temperature in Castro typically varies from 10°C to 26°C, and is rarely below 4°C or above 29°C. January is the hottest month of the year, while July is the coldest.
Based on the travel score, the best time of year to visit Castro for warm-weather activities is from late March to early November.
- Hottest
- Jan
- 26°
- Coldest
- Jul
- 10°
- Wettest
- Jan
- 235 mm
- Driest
- Apr
- 70 mm
- Rain / yr
- 1518 mm
- 166 wet days
- Daylight
- 10.5–13.5 h
- shortest–longest
- Elevation
- 986 m
- 24.8°S
- Clearest
- Aug
- 44% cloud
Castro is human settlement in Brazil.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Castro 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 late March to early November.
Temperature through the year
Daily average highs and lows in Castro, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
Temperatures in Castro stay fairly even through the year, without a distinct hot or cool season. The warmest month is January, with an average high of 26°C and low of 17°C; the coolest is July, with an average low of 10°C and high of 19°C.
Days typically run about 9°C warmer than nights year-round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 26 | 26 | 25 | 23 | 20 | 19 | 19 | 21 | 22 | 23 | 24 | 26 |
| Avg low (°C) | 17 | 17 | 17 | 15 | 12 | 11 | 10 | 11 | 12 | 14 | 15 | 17 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 26 | 17 |
| Feb | 26 | 17 |
| Mar | 25 | 17 |
| Apr | 23 | 15 |
| May | 20 | 12 |
| Jun | 19 | 11 |
| Jul | 19 | 10 |
| Aug | 21 | 11 |
| Sep | 22 | 12 |
| Oct | 23 | 14 |
| Nov | 24 | 15 |
| Dec | 26 | 17 |
Average hourly temperature in Castro
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 26°C, and coldest before dawn in July, near 10°C.
Castro 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 | 26° / 17° | 235 | 23.8 | 13.4 | 4.5 |
| Feb | 26° / 17° | 178 | 21 | 12.9 | 4.6 |
| Mar | 25° / 17° | 132 | 18 | 12.2 | 5.5 |
| Apr | 23° / 15° | 70 | 9.6 | 11.4 | 6.9 |
| May | 20° / 12° | 89 | 8.9 | 10.8 | 6.5 |
| Jun | 19° / 11° | 93 | 8.4 | 10.5 | 6.5 |
| Jul | 19° / 10° | 79 | 7 | 10.6 | 6.8 |
| Aug | 21° / 11° | 72 | 7.3 | 11.1 | 7.2 |
| Sep | 22° / 12° | 127 | 10.4 | 11.8 | 6.6 |
| Oct | 23° / 14° | 138 | 15.1 | 12.6 | 5.9 |
| Nov | 24° / 15° | 133 | 16.1 | 13.2 | 5.8 |
| Dec | 26° / 17° | 173 | 20.3 | 13.5 | 5.1 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Castro gets about 1518 mm of precipitation a year. On a typical day the chance of rain is very wet, but that rises and falls sharply with the seasons.
The wetter season lasts 5.7 months, from around Oct 6 to Mar 27, peaking in January at about 77% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Jul 26.
January is the wettest month by volume, with 235 mm over about 24 wet days; April is the driest, with 70 mm.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 76 | 75 | 58 | 33 | 29 | 28 | 24 | 23 | 35 | 48 | 54 | 65 |
| Rain days | 24 | 21 | 18 | 10 | 9 | 8 | 7 | 7 | 10 | 15 | 16 | 20 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 76 | 24 |
| Feb | 75 | 21 |
| Mar | 58 | 18 |
| Apr | 33 | 10 |
| May | 29 | 9 |
| Jun | 28 | 8 |
| Jul | 24 | 7 |
| Aug | 23 | 7 |
| Sep | 35 | 10 |
| Oct | 48 | 15 |
| Nov | 54 | 16 |
| Dec | 65 | 20 |
Monthly rainfall
Over a full year, Castro collects about 1518 mm of rain across 166 wet days — roughly 126 mm in an average month.
It doesn’t fall evenly. January is the wettest month with 235 mm, while April is the driest at just 70 mm. The three wettest months alone bring about 39% of the year’s total.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (mm) | 235 | 178 | 132 | 70 | 89 | 93 | 79 | 72 | 127 | 138 | 133 | 173 |
| Rain days | 24 | 21 | 18 | 10 | 9 | 8 | 7 | 7 | 10 | 15 | 16 | 20 |
| Rainfall (mm) | Rain days | |
|---|---|---|
| Jan | 235 | 24 |
| Feb | 178 | 21 |
| Mar | 132 | 18 |
| Apr | 70 | 10 |
| May | 89 | 9 |
| Jun | 93 | 8 |
| Jul | 79 | 7 |
| Aug | 72 | 7 |
| Sep | 127 | 10 |
| Oct | 138 | 15 |
| Nov | 133 | 16 |
| Dec | 173 | 20 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Castro, the average share of the sky covered by clouds shows significant seasonal variation over the course of the year.
The clearer part of the year begins around March 29 and lasts for 5.8 months, ending around September 21. The clearest month is August, when the sky is clear, mostly clear, or partly cloudy 62% of the time on average.
The cloudier part of the year begins around September 22 and lasts for 6.2 months, ending around March 28. The cloudiest month is January, when it is overcast or mostly cloudy 73% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 27 | 30 | 39 | 48 | 46 | 53 | 57 | 62 | 48 | 32 | 35 | 34 |
| Cloudier (%) | 73 | 70 | 61 | 52 | 54 | 47 | 43 | 38 | 52 | 68 | 65 | 66 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 27 | 73 |
| Feb | 30 | 70 |
| Mar | 39 | 61 |
| Apr | 48 | 52 |
| May | 46 | 54 |
| Jun | 53 | 47 |
| Jul | 57 | 43 |
| Aug | 62 | 38 |
| Sep | 48 | 52 |
| Oct | 32 | 68 |
| Nov | 35 | 65 |
| Dec | 34 | 66 |
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 13 h 30 min of light; the shortest, around June 4, only 10 h 30 min — a swing of roughly 3 hours.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 13.4 | 12.9 | 12.2 | 11.4 | 10.8 | 10.5 | 10.6 | 11.1 | 11.8 | 12.6 | 13.2 | 13.5 |
| Sunrise (AM) | 6:48 | 7:09 | 7:24 | 7:38 | 7:52 | 8:06 | 8:08 | 7:50 | 7:19 | 6:47 | 6:29 | 6:30 |
| Sunset (PM) | 8:11 | 8:00 | 7:35 | 7:03 | 6:40 | 6:34 | 6:44 | 6:58 | 7:10 | 7:23 | 7:42 | 8:02 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 13.4 | 6:48 | 8:11 |
| Feb | 12.9 | 7:09 | 8:00 |
| Mar | 12.2 | 7:24 | 7:35 |
| Apr | 11.4 | 7:38 | 7:03 |
| May | 10.8 | 7:52 | 6:40 |
| Jun | 10.5 | 8:06 | 6:34 |
| Jul | 10.6 | 8:08 | 6:44 |
| Aug | 11.1 | 7:50 | 6:58 |
| Sep | 11.8 | 7:19 | 7:10 |
| Oct | 12.6 | 6:47 | 7:23 |
| Nov | 13.2 | 6:29 | 7:42 |
| Dec | 13.5 | 6:30 | 8:02 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Castro averages about 8 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 3 and 16 days.
The sunnier stretch runs 5.5 months, from around Apr 13 to Sep 26. The sunniest month is August, with roughly 15 sunny days (bright).
The greyest month is February, down near 3 sunny days — about 79% fewer than the August peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 3 | 3 | 6 | 8 | 9 | 12 | 14 | 15 | 11 | 6 | 6 | 4 |
| Sky | Gloomy | Gloomy | Gloomy | Mixed | Mixed | Mixed | Mixed | Bright | Mixed | Gloomy | Gloomy | Gloomy |
| Sunny days | Sky | |
|---|---|---|
| Jan | 3 | Gloomy |
| Feb | 3 | Gloomy |
| Mar | 6 | Gloomy |
| Apr | 8 | Mixed |
| May | 9 | Mixed |
| Jun | 12 | Mixed |
| Jul | 14 | Mixed |
| Aug | 15 | Bright |
| Sep | 11 | Mixed |
| Oct | 6 | Gloomy |
| Nov | 6 | Gloomy |
| Dec | 4 | Gloomy |
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 Castro, how humid it feels changes dramatically over the year.
The more humid part of the year lasts 6.2 months, from around October 14 to April 19. The muggiest month is February, when the air feels humid, muggy or worse about 89% of the time.
The most comfortable stretch runs from around April 20 to October 13, and July is the most comfortable month — the air is dry or comfortable 99% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 1 | 0 | 3 | 22 | 54 | 69 | 80 | 79 | 54 | 27 | 19 | 5 |
| Comfortable (%) | 13 | 11 | 20 | 33 | 37 | 28 | 19 | 20 | 36 | 34 | 31 | 22 |
| Humid (%) | 41 | 43 | 51 | 39 | 9 | 3 | 1 | 2 | 10 | 36 | 41 | 44 |
| Muggy (%) | 46 | 46 | 26 | 6 | 0 | 0 | 0 | 0 | 0 | 3 | 10 | 28 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| Jan | 1 | 13 | 41 | 46 |
| Feb | 0 | 11 | 43 | 46 |
| Mar | 3 | 20 | 51 | 26 |
| Apr | 22 | 33 | 39 | 6 |
| May | 54 | 37 | 9 | 0 |
| Jun | 69 | 28 | 3 | 0 |
| Jul | 80 | 19 | 1 | 0 |
| Aug | 79 | 20 | 2 | 0 |
| Sep | 54 | 36 | 10 | 0 |
| Oct | 27 | 34 | 36 | 3 |
| Nov | 19 | 31 | 41 | 10 |
| Dec | 5 | 22 | 44 | 28 |
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 Castro is steady company: average speeds sit near 11 km/h — calm — 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) | 10 | 10 | 10 | 10 | 10 | 11 | 11 | 11 | 12 | 12 | 12 | 11 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 10 | calm |
| Feb | 10 | calm |
| Mar | 10 | calm |
| Apr | 10 | calm |
| May | 10 | calm |
| Jun | 11 | calm |
| Jul | 11 | calm |
| Aug | 11 | calm |
| Sep | 12 | calm |
| Oct | 12 | calm |
| Nov | 12 | calm |
| Dec | 11 | calm |
Best time to visit Castro
To characterize how pleasant the weather is in Castro throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around early April, Castro 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 Castro for general outdoor tourist activities is from late March to early November, with a peak score in the last week of August.
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) | 4.6 | 4.6 | 5.5 | 6.8 | 6.5 | 6.5 | 6.8 | 7.2 | 6.6 | 5.9 | 5.8 | 5.1 |
| Rating | fair | fair | good | good | good | good | good | good | good | good | good | fair |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 4.6 | fair |
| Feb | 4.6 | fair |
| Mar | 5.5 | good |
| Apr | 6.8 | good |
| May | 6.5 | good |
| Jun | 6.5 | good |
| Jul | 6.8 | good |
| Aug | 7.2 | good |
| Sep | 6.6 | good |
| Oct | 5.9 | good |
| Nov | 5.8 | good |
| Dec | 5.1 | fair |
The beach/pool score favors clear, rainless days with daytime highs between 24°C and 34°C. Based on this score, the best times of year to visit Castro for hot-weather activities run from early March to early May and again from early October to late December, with a peak score in the second week of April.
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 Castro, 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 26°C), the essentials are light clothes, rain gear and sun protection. In the cold season around July (highs near 19°C), pack a light layer.
In January, Castro sees daytime highs around 26°C and nights near 17°C. Pack rain gear. Worth having: light clothes and sun protection. About 24 days see rain.
UV index (midday) in Castro 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 Castro peaks around January 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 13 at about 5 (high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 15 | 15 | 12 | 9 | 7 | 6 | 5 | 7 | 5 | 11 | 14 | 14 |
| Level | Extreme | Extreme | Extreme | Very high | High | High | High | High | High | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 15 | Extreme |
| Feb | 15 | Extreme |
| Mar | 12 | Extreme |
| Apr | 9 | Very high |
| May | 7 | High |
| Jun | 6 | High |
| Jul | 5 | High |
| Aug | 7 | High |
| Sep | 5 | High |
| Oct | 11 | Extreme |
| Nov | 14 | Extreme |
| Dec | 14 | Extreme |
Average hourly UV index in Castro
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 7.5 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 | 8 | 7 | 6 | 5 | 5 | 6 | 6 | 8 | 8.5 | 9 |
| UV ≥ 6 (h/day) | 7.5 | 7 | 6 | 4.5 | 2.5 | 0 | 0 | 2.5 | 0 | 6 | 6.5 | 7 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 9 | 7.5 |
| Feb | 8.5 | 7 |
| Mar | 8 | 6 |
| Apr | 7 | 4.5 |
| May | 6 | 2.5 |
| Jun | 5 | 0 |
| Jul | 5 | 0 |
| Aug | 6 | 2.5 |
| Sep | 6 | 0 |
| Oct | 8 | 6 |
| Nov | 8.5 | 6.5 |
| Dec | 9 | 7 |
Air quality in Castro by month
Average fine-particle pollution (PM2.5) through the year — so you can see which months the air is worst, not just the yearly average.
Air quality in Castro is worst in September — around 17 µg/m³ PM2.5 (moderate), about 2.6× the cleanest month (March, 6 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 7 | 7 | 6 | 7 | 8 | 8 | 10 | 14 | 17 | 10 | 7 | 7 |
| Level | Good | Good | Good | Good | Good | Good | Good | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 7 | Good |
| Feb | 7 | Good |
| Mar | 6 | Good |
| Apr | 7 | Good |
| May | 8 | Good |
| Jun | 8 | Good |
| Jul | 10 | Good |
| Aug | 14 | Moderate |
| Sep | 17 | Moderate |
| Oct | 10 | Good |
| Nov | 7 | Good |
| Dec | 7 | Good |
Growing season
Castro is frost-free year round — even the coldest nights rarely reach freezing, so there is no start or end to the growing season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Frost nights | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 100 | 0 |
| Feb | 100 | 0 |
| Mar | 100 | 0 |
| Apr | 100 | 0 |
| May | 100 | 0 |
| Jun | 100 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 0 |
| Sep | 100 | 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. Castro banks about 3,061 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) | 358 | 323 | 335 | 269 | 185 | 150 | 144 | 182 | 217 | 269 | 290 | 340 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 358 |
| Feb | 323 |
| Mar | 335 |
| Apr | 269 |
| May | 185 |
| Jun | 150 |
| Jul | 144 |
| Aug | 182 |
| Sep | 217 |
| Oct | 269 |
| Nov | 290 |
| Dec | 340 |
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.
Castro receives about 4.6 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 3.1 and 5.9 kWh/m².
The brighter stretch of the year lasts 6.9 months, from around Sep 2 to Mar 29. The brightest month is December, averaging about 5.9 kWh/m² (bright).
The dimmest month is June, down near 3.1 kWh/m² — roughly 48% less than the December peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.5 | 5.3 | 4.9 | 4.3 | 3.4 | 3.0 | 3.4 | 4.2 | 4.6 | 5.1 | 5.7 | 5.9 |
| Level | Bright | Bright | Bright | Bright | Moderate | Moderate | Moderate | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 5.5 | Bright |
| Feb | 5.3 | Bright |
| Mar | 4.9 | Bright |
| Apr | 4.3 | Bright |
| May | 3.4 | Moderate |
| Jun | 3.0 | Moderate |
| Jul | 3.4 | Moderate |
| Aug | 4.2 | Bright |
| Sep | 4.6 | Bright |
| Oct | 5.1 | Bright |
| Nov | 5.7 | Bright |
| Dec | 5.9 | Bright |
Where is Castro?
Castro sits at 24.8°S, 50.0°W, 986 m above sea level, in Brazil. The nearest listed city is Piraí do Sul, 30 km away.
Topography around Castro
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Castro.
Within 3 km, the terrain around Castro has only modest variations in elevation — a maximum elevation change of 151 m around an average of 1,004 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 304 m; within 80 km, large variations in elevation — a maximum elevation change of 1,128 m.
The land around Castro is covered by trees (42%), artificial surfaces (28%) and grassland (20%) within 3 km, trees (42%) and cropland (42%) within 16 km, and trees (58%) and cropland (30%) within 80 km.
Brazil travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / N
- 127 / 220 V · 60 Hz
- Prices
- ≈ 46% of US
- price level, 2025
- GDP per capita
- $10,713
- 2025
- Happiness
- 6.6 / 10
- World Happiness, 2025
- Safe drinking water
- 89%
- of population, 2024
- Homicide rate
- 19.3
- per 100k, 2023
- Road deaths
- 16
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Low
- EF EPI 482
- 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 Castro (-24.7893°, -50.0123°, elevation 986 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).