Callao climate — normals and trends
Callao (Peru) has a hot desert climate (BWh) under the Köppen-Geiger classification. Its mean annual temperature is 18.0 °C and it receives 78 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is February (21.3 °C on average) and the coldest is September (15.6 °C). Rainfall peaks in June.
Callao averages 0 frost days, 0 hot days (≥ 30 °C) and 16 rainy days per year.
No statistically significant temperature trend emerges for Callao between 1940 and 2025: over this span, year-to-year swings outweigh the climate signal.
The hottest day of the period reached 27.1 °C (on 28 January 1983) and the coldest 11.7 °C (on 22 October 1954).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
CallaoCallao
- coords
- -12.05°, -77.13°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
18.0°C
Average daily high
18.7°C
Average daily low
17.5°C
Annual rainfall
78mm
Sunshine / day
10.9h
Mean relative humidity
92%
Average peak wind
21.3km/h
Seasonal range
5.7°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
16 d/yr
Annual snowfall
0.0 cm
Average feels-like high
19.8 °C
Average feels-like low
17.3 °C
Average peak gust
29.4 km/h
Tropical nights (≥ 20 °C)
66 d/yr
Solar radiation
21.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
No clear trend over this period
Over a short window, year-to-year swings outweigh the climate signal. Try 86 years.
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
27.1 °C
28 January 1983
Coldest day
11.7 °C
22 October 1954
Wettest day
63 mm
28 May 1941
Windiest day
40.5 km/h
15 June 1998
Strongest gust
56.2 km/h
15 June 1998
Hottest feels-like
32.2 °C
7 February 1983
Coldest feels-like
9.1 °C
10 July 1954
Sunniest day
12.6 h
15 January 2025
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 20.6 °C | -0.7 °C | 2 mm | -4 mm |
| Feb | 22.5 °C | +0.4 °C | 11 mm | +2 mm |
| Mar | 21.9 °C | +0.1 °C | 3 mm | -5 mm |
| Apr | 19.5 °C | -0.6 °C | 3 mm | -1 mm |
| May | 17.8 °C | -0.7 °C | 3 mm | -4 mm |
| Jun | 17.6 °C | +0.2 °C | 19 mm | +9 mm |
| Jul | 16.9 °C | +0.2 °C | 8 mm | -1 mm |
| Aug | 16.4 °C | +0.1 °C | 12 mm | +4 mm |
| Sep | 16.2 °C | 0.0 °C | 5 mm | -1 mm |
| Oct | 16.8 °C | +0.1 °C | 3 mm | -2 mm |
| Nov | 17.5 °C | -0.3 °C | 2 mm | -1 mm |
| Dec | 19.0 °C | -0.6 °C | 4 mm | 0 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Callao?
Callao has a hot desert climate (Köppen BWh). Over 1940-2025, the average annual temperature is 18.0 °C and it receives 78 mm of precipitation per year.
What is the hottest day ever recorded in Callao?
The hottest day measured in Callao between 1940 and 2025 was 28 January 1983, reaching 27.1 °C.
What is the coldest day in Callao?
The coldest day measured in Callao between 1940 and 2025 was 22 October 1954, at 11.7 °C.
Does it snow in Callao?
Almost never: Callao sees virtually no snow, with about 0 frost days per year.
Has the climate of Callao warmed?
Between 1940 and 2025, no statistically significant temperature trend emerges in Callao.
What is the wettest day in Callao?
The wettest day measured in Callao between 1940 and 2025 was 28 May 1941, with 63 mm of rain in 24 hours.
What was the windiest day in Callao?
The windiest day measured in Callao between 1940 and 2025 was 15 June 1998, with winds reaching 40.5 km/h.
What is the warmest month in Callao?
The warmest month in Callao is February (21.3 °C on average); the coldest is September (15.6 °C).
How much does it rain in Callao?
Callao receives on average 78 mm of precipitation per year, spread over about 16 rainy days.
Is it sunny in Callao?
Callao gets on average 10.9 hours of sunshine per day, roughly 3,979 hours per year over 1940-2025.
Are there tropical nights in Callao?
Yes: Callao has on average 66 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Callao?
In Callao, between 1940 and 2025, the highest apparent temperature reached 32.2 °C on 7 February 1983, and the lowest was 9.1 °C on 10 July 1954.
Compare Callao with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Callao