Climate and average weather in Callao
In Callao, the summers are humid, warm, dry, and mostly cloudy and the winters are mild, breezy, and mostly cloudy.
Over the course of the year, the temperature in Callao typically varies from 15°C to 23°C, and is rarely below 14°C or above 24°C. February is the hottest month of the year, while August is the coldest.
Based on the travel score, the best time of year to visit Callao for warm-weather activities is from early January to late December.
- Hottest
- Feb
- 23°
- Coldest
- Aug
- 15°
- Wettest
- Feb
- 8 mm
- Driest
- Apr
- 2 mm
- Rain / yr
- 49 mm
- 11 wet days
- Daylight
- 11.3–12.7 h
- shortest–longest
- Elevation
- 5 m
- 12.1°S
- Clearest
- May
- 70% cloud
Callao is city and main seaport of Peru.
- Air quality
- High
- PM2.5 25.5 µg/m³ · 2016
- Density
- 8,343/km²
- people per km²
- Founded
- 1537
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Callao 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 late December.
Temperature through the year
Daily average highs and lows in Callao, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
Temperatures in Callao stay fairly even through the year, without a distinct hot or cool season. The warmest month is February, with an average high of 23°C and low of 21°C; the coolest is August, with an average low of 15°C and high of 16°C.
Days typically run about 1°C warmer than nights year-round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 22 | 23 | 22 | 20 | 19 | 18 | 17 | 16 | 16 | 17 | 18 | 20 |
| Avg low (°C) | 20 | 21 | 21 | 19 | 18 | 17 | 16 | 15 | 15 | 16 | 17 | 19 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 22 | 20 |
| Feb | 23 | 21 |
| Mar | 22 | 21 |
| Apr | 20 | 19 |
| May | 19 | 18 |
| Jun | 18 | 17 |
| Jul | 17 | 16 |
| Aug | 16 | 15 |
| Sep | 16 | 15 |
| Oct | 17 | 16 |
| Nov | 18 | 17 |
| Dec | 20 | 19 |
Average hourly temperature in Callao
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 February afternoons, near 23°C, and coldest before dawn in August, near 15°C.
Callao 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 | 22° / 20° | 5 | 1.5 | 12.6 | 7.4 |
| Feb | 23° / 21° | 8 | 2 | 12.4 | 7.4 |
| Mar | 22° / 21° | 6 | 1.7 | 12.1 | 7.4 |
| Apr | 20° / 19° | 2 | 0.2 | 11.7 | 7.4 |
| May | 19° / 18° | 2 | 0.2 | 11.5 | 7.1 |
| Jun | 18° / 17° | 5 | 1.1 | 11.3 | 6.5 |
| Jul | 17° / 16° | 5 | 1.2 | 11.4 | 6.1 |
| Aug | 16° / 15° | 5 | 1.2 | 11.6 | 6.0 |
| Sep | 16° / 15° | 4 | 0.5 | 11.9 | 6.0 |
| Oct | 17° / 16° | 3 | 0.3 | 12.3 | 6.2 |
| Nov | 18° / 17° | 2 | 0.1 | 12.6 | 6.9 |
| Dec | 20° / 19° | 3 | 0.6 | 12.7 | 7.1 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Callao gets about 49 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.
February is the wettest month by volume, with 8 mm over about 2 wet days; April is the driest, with 2 mm.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 5 | 7 | 5 | 1 | 1 | 4 | 4 | 4 | 2 | 1 | 0 | 2 |
| Rain days | 2 | 2 | 2 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 1 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 5 | 2 |
| Feb | 7 | 2 |
| Mar | 5 | 2 |
| Apr | 1 | 0 |
| May | 1 | 0 |
| Jun | 4 | 1 |
| Jul | 4 | 1 |
| Aug | 4 | 1 |
| Sep | 2 | 1 |
| Oct | 1 | 0 |
| Nov | 0 | 0 |
| Dec | 2 | 1 |
Monthly rainfall
Over a full year, Callao collects about 49 mm of rain across 11 wet days — roughly 4 mm in an average month.
It doesn’t fall evenly. February is the wettest month with 8 mm, while April is the driest at just 2 mm. The three wettest months alone bring about 38% of the year’s total.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (mm) | 5 | 8 | 6 | 2 | 2 | 5 | 5 | 5 | 4 | 3 | 2 | 3 |
| Rain days | 2 | 2 | 2 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 1 |
| Rainfall (mm) | Rain days | |
|---|---|---|
| Jan | 5 | 2 |
| Feb | 8 | 2 |
| Mar | 6 | 2 |
| Apr | 2 | 0 |
| May | 2 | 0 |
| Jun | 5 | 1 |
| Jul | 5 | 1 |
| Aug | 5 | 1 |
| Sep | 4 | 1 |
| Oct | 3 | 0 |
| Nov | 2 | 0 |
| Dec | 3 | 1 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Callao, 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 April 8 and lasts for 2.0 months, ending around June 6. The clearest month is August, when the sky is clear, mostly clear, or partly cloudy 29% of the time on average.
The cloudier part of the year begins around December 7 and lasts for 4.0 months, ending around April 7. The cloudiest month is February, when it is overcast or mostly cloudy 88% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 18 | 12 | 13 | 28 | 28 | 21 | 20 | 29 | 28 | 25 | 27 | 21 |
| Cloudier (%) | 82 | 88 | 87 | 72 | 72 | 79 | 80 | 71 | 72 | 75 | 73 | 79 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 18 | 82 |
| Feb | 12 | 88 |
| Mar | 13 | 87 |
| Apr | 28 | 72 |
| May | 28 | 72 |
| Jun | 21 | 79 |
| Jul | 20 | 80 |
| Aug | 29 | 71 |
| Sep | 28 | 72 |
| Oct | 25 | 75 |
| Nov | 27 | 73 |
| Dec | 21 | 79 |
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 12 h 42 min of light; the shortest, around June 1, only 11 h 18 min — a swing of roughly 1 h 24 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.6 | 12.4 | 12.1 | 11.7 | 11.5 | 11.3 | 11.4 | 11.6 | 11.9 | 12.3 | 12.6 | 12.7 |
| Sunrise (AM) | 5:59 | 6:11 | 6:16 | 6:17 | 6:21 | 6:30 | 6:33 | 6:25 | 6:05 | 5:45 | 5:37 | 5:44 |
| Sunset (PM) | 6:37 | 6:35 | 6:21 | 6:01 | 5:48 | 5:48 | 5:55 | 6:01 | 6:01 | 6:02 | 6:11 | 6:26 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 12.6 | 5:59 | 6:37 |
| Feb | 12.4 | 6:11 | 6:35 |
| Mar | 12.1 | 6:16 | 6:21 |
| Apr | 11.7 | 6:17 | 6:01 |
| May | 11.5 | 6:21 | 5:48 |
| Jun | 11.3 | 6:30 | 5:48 |
| Jul | 11.4 | 6:33 | 5:55 |
| Aug | 11.6 | 6:25 | 6:01 |
| Sep | 11.9 | 6:05 | 6:01 |
| Oct | 12.3 | 5:45 | 6:02 |
| Nov | 12.6 | 5:37 | 6:11 |
| Dec | 12.7 | 5:44 | 6:26 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Callao averages about 2 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 1 and 4 days.
The sunnier stretch runs 2.0 months, from around Apr 2 to Jun 1. The sunniest month is April, with roughly 3 sunny days (gloomy).
The greyest month is February, down near 1 sunny days — about 79% fewer than the April peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 2 | 1 | 1 | 3 | 3 | 1 | 1 | 2 | 2 | 2 | 2 | 3 |
| Sky | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy |
| Sunny days | Sky | |
|---|---|---|
| Jan | 2 | Gloomy |
| Feb | 1 | Gloomy |
| Mar | 1 | Gloomy |
| Apr | 3 | Gloomy |
| May | 3 | Gloomy |
| Jun | 1 | Gloomy |
| Jul | 1 | Gloomy |
| Aug | 2 | Gloomy |
| Sep | 2 | Gloomy |
| Oct | 2 | Gloomy |
| Nov | 2 | Gloomy |
| Dec | 3 | 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 Callao, how humid it feels changes dramatically over the year.
The more humid part of the year lasts 6.4 months, from around November 15 to May 29. The muggiest month is January, when the air feels humid, muggy or worse about 100% of the time.
The most comfortable stretch runs from around May 30 to November 14, and August is the most comfortable month — the air is dry or comfortable 96% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 3 | 1 | 0 | 0 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 20 | 62 | 90 | 94 | 92 | 84 | 38 | 1 |
| Humid (%) | 9 | 0 | 4 | 47 | 69 | 35 | 8 | 3 | 4 | 15 | 60 | 72 |
| Muggy (%) | 85 | 85 | 83 | 50 | 11 | 3 | 1 | 1 | 1 | 0 | 2 | 25 |
| Oppressive (%) | 6 | 15 | 13 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| Jan | 0 | 0 | 9 | 85 | 6 |
| Feb | 0 | 0 | 0 | 85 | 15 |
| Mar | 0 | 0 | 4 | 83 | 13 |
| Apr | 0 | 0 | 47 | 50 | 2 |
| May | 0 | 20 | 69 | 11 | 0 |
| Jun | 0 | 62 | 35 | 3 | 0 |
| Jul | 1 | 90 | 8 | 1 | 0 |
| Aug | 3 | 94 | 3 | 1 | 0 |
| Sep | 3 | 92 | 4 | 1 | 0 |
| Oct | 1 | 84 | 15 | 0 | 0 |
| Nov | 0 | 38 | 60 | 2 | 0 |
| Dec | 0 | 1 | 72 | 25 | 1 |
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 Callao is typically light breeze, near 18 km/h, and varies moderately with the seasons.
The windier part of the year lasts 6.8 months, from around May 9 to Nov 30. The windiest month is August, averaging about 20 km/h (breezy).
The calmer part of the year runs from around Dec 1 to May 8, with February the calmest month at about 13 km/h.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 15 | 13 | 14 | 16 | 18 | 20 | 20 | 20 | 20 | 20 | 18 | 17 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | breezy | breezy | breezy | light breeze | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 15 | light breeze |
| Feb | 13 | light breeze |
| Mar | 14 | light breeze |
| Apr | 16 | light breeze |
| May | 18 | light breeze |
| Jun | 20 | light breeze |
| Jul | 20 | breezy |
| Aug | 20 | breezy |
| Sep | 20 | breezy |
| Oct | 20 | light breeze |
| Nov | 18 | light breeze |
| Dec | 17 | light breeze |
Best time to visit Callao
To characterize how pleasant the weather is in Callao throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around late December, Callao is still near the tail of its best-weather window — great conditions with the peak-season crowds already thinning.
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, Callao suits general outdoor tourist activities for most of the year, with a peak score in the third week of April.
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) | 7.4 | 7.4 | 7.4 | 7.4 | 7.1 | 6.5 | 6.1 | 6.0 | 6.0 | 6.3 | 6.8 | 7.1 |
| Rating | good | good | good | good | good | good | good | good | good | good | good | good |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 7.4 | good |
| Feb | 7.4 | good |
| Mar | 7.4 | good |
| Apr | 7.4 | good |
| May | 7.1 | good |
| Jun | 6.5 | good |
| Jul | 6.1 | good |
| Aug | 6.0 | good |
| Sep | 6.0 | good |
| Oct | 6.3 | good |
| Nov | 6.8 | good |
| Dec | 7.1 | 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 Callao for hot-weather activities is from early January to early April, with a peak score in the third week of February.
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 Callao, 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 February (highs near 23°C), the essentials are light clothes and sun protection. In the cold season around August (highs near 16°C), pack a warm layer, sun protection and a windbreaker.
In February, Callao sees daytime highs around 23°C and nights near 21°C. Pack sun protection. Worth having: light clothes.
Sea temperature near Callao
Average ocean temperature at the nearest coast, month by month, banded into swim-comfort zones — the other half of the beach question.
The sea offshore is warmest in February at about 22°C and coldest in September near 17°C.
It's comfortable for a long swim from Jan 1 to Apr 9 — about 3.3 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 21 | 22 | 21 | 20 | 19 | 18 | 18 | 17 | 17 | 17 | 18 | 19 |
| Comfort | Refreshing | Refreshing | Refreshing | Cool | Cool | Cool | Cool | Cool | Cool | Cool | Cool | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 21 | Refreshing |
| Feb | 22 | Refreshing |
| Mar | 21 | Refreshing |
| Apr | 20 | Cool |
| May | 19 | Cool |
| Jun | 18 | Cool |
| Jul | 18 | Cool |
| Aug | 17 | Cool |
| Sep | 17 | Cool |
| Oct | 17 | Cool |
| Nov | 18 | Cool |
| Dec | 19 | Cool |
UV index (midday) in Callao 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 Callao peaks around February 12 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 at about 8 (very 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) | 14 | 16 | 13 | 12 | 10 | 8 | 8 | 10 | 10 | 13 | 12 | 13 |
| Level | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 14 | Extreme |
| Feb | 16 | Extreme |
| Mar | 13 | Extreme |
| Apr | 12 | Extreme |
| May | 10 | Very high |
| Jun | 8 | Very high |
| Jul | 8 | Very high |
| Aug | 10 | Extreme |
| Sep | 10 | Extreme |
| Oct | 13 | Extreme |
| Nov | 12 | Extreme |
| Dec | 13 | Extreme |
Average hourly UV index in Callao
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 February the burn window is concentrated in the middle of the day: about 8.5 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) | 8.5 | 8.5 | 8 | 7.5 | 7 | 6.5 | 7 | 7.5 | 7.5 | 8 | 8 | 8.5 |
| UV ≥ 6 (h/day) | 7 | 7 | 6 | 5.5 | 5 | 4 | 4 | 5 | 5.5 | 6 | 6 | 6.5 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 8.5 | 7 |
| Feb | 8.5 | 7 |
| Mar | 8 | 6 |
| Apr | 7.5 | 5.5 |
| May | 7 | 5 |
| Jun | 6.5 | 4 |
| Jul | 7 | 4 |
| Aug | 7.5 | 5 |
| Sep | 7.5 | 5.5 |
| Oct | 8 | 6 |
| Nov | 8 | 6 |
| Dec | 8.5 | 6.5 |
Air quality in Callao 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 Callao is worst in March — around 30 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.
Seasonal pattern from CAMS reanalysis, scaled to Callao's WHO annual average of 25.5 µg/m³.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 22 | 27 | 30 | 28 | 29 | 28 | 26 | 25 | 23 | 23 | 22 | 22 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 22 | Moderate |
| Feb | 27 | Moderate |
| Mar | 30 | Moderate |
| Apr | 28 | Moderate |
| May | 29 | Moderate |
| Jun | 28 | Moderate |
| Jul | 26 | Moderate |
| Aug | 25 | Moderate |
| Sep | 23 | Moderate |
| Oct | 23 | Moderate |
| Nov | 22 | Moderate |
| Dec | 22 | Moderate |
Growing season
Callao 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. Callao banks about 3,025 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around February.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°C·days) | 338 | 330 | 353 | 292 | 253 | 213 | 195 | 180 | 174 | 194 | 222 | 282 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 338 |
| Feb | 330 |
| Mar | 353 |
| Apr | 292 |
| May | 253 |
| Jun | 213 |
| Jul | 195 |
| Aug | 180 |
| Sep | 174 |
| Oct | 194 |
| Nov | 222 |
| Dec | 282 |
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.
Callao receives about 5.8 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 4.3 and 6.8 kWh/m².
The brighter stretch of the year lasts 6.9 months, from around Sep 15 to Apr 12. The brightest month is November, averaging about 6.7 kWh/m² (intense).
The dimmest month is June, down near 4.4 kWh/m² — roughly 35% less than the November peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 6.6 | 6.4 | 6.2 | 5.7 | 4.9 | 4.4 | 4.5 | 5.1 | 5.8 | 6.4 | 6.8 | 6.7 |
| Level | Intense | Intense | Intense | Bright | Bright | Bright | Bright | Bright | Bright | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 6.6 | Intense |
| Feb | 6.4 | Intense |
| Mar | 6.2 | Intense |
| Apr | 5.7 | Bright |
| May | 4.9 | Bright |
| Jun | 4.4 | Bright |
| Jul | 4.5 | Bright |
| Aug | 5.1 | Bright |
| Sep | 5.8 | Bright |
| Oct | 6.4 | Intense |
| Nov | 6.8 | Intense |
| Dec | 6.7 | Intense |
Where is Callao?
Callao sits at 12.1°S, 77.1°W, 5 m above sea level, in Peru. The nearest listed city is Carmen De La Legua Reynoso, 4.0 km away.
Topography around Callao
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Callao.
Within 3 km, the terrain around Callao has only modest variations in elevation — a maximum elevation change of 43 m around an average of 10 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 737 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,870 m.
The land around Callao is covered by artificial surfaces (54%) and water (33%) within 3 km, water (60%) and artificial surfaces (30%) within 16 km, and water (50%) and bare terrain (29%) within 80 km.
Peru travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type A / B / C
- 220 V · 60 Hz
- Prices
- ≈ 51% of US
- price level, 2025
- GDP per capita
- $9,684
- 2025
- Happiness
- 6.0 / 10
- World Happiness, 2025
- Safe drinking water
- 49%
- of population, 2024
- Homicide rate
- 8.6
- per 100k, 2021
- Road deaths
- 13.6
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Moderate
- EF EPI 519
- 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 Callao (-12.0516°, -77.1345°, elevation 5 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. 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).