Everything below is collected in one spot so you do not have to cross-check Callao climate: monthly averages by hand. The gap between Jul and Mar is 3.4 C here: 16.7 C against 20.1 C. Precipitation peaks in Feb (0.17 mm/day) and bottoms out in Jun (0.02 mm/day), so a 8.5x difference between the two. Taken together that is roughly 23 mm of rain a year for the grid cell. Every run re-reads the source and only rewrites this page when a figure actually changed. The table underneath carries the per-month breakdown; the related pages cover the same dataset nearby.
Annual mean temperature 18.2 C
Warmest month Mar (20.1 C)
Coldest month Jul (16.7 C)
Wettest month Feb (0.17 mm/day)
All-time record high 27.3 C
All-time record low 10.2 C
Annual precipitation 22 mm / year
Coordinates -12.0516, -77.1345
Population 1,226,200
Average monthly temperature and rainfall in Callao
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
19.4
0.09
26.5
14.5
Feb
20.0
0.17
26.8
15.5
Mar
20.1
0.14
27.3
15.3
Apr
19.3
0.03
26.5
13.4
May
18.1
0.03
25.3
11.4
Jun
17.2
0.02
25.4
11.0
Jul
16.7
0.03
24.3
10.7
Aug
16.9
0.04
24.6
10.2
Sep
17.3
0.02
24.5
11.2
Oct
17.4
0.04
24.7
11.1
Nov
17.8
0.06
24.8
11.9
Dec
18.5
0.10
25.8
12.7
What the Callao climate table shows
Values are multi-decadal climatological averages for the -12.0516, -77.1345 grid cell, not a single year. Rain is the daily mean, so a value of 2.00 mm/day is about 60 mm across a 30-day month. Averages smooth over extremes, so use them for planning rather than for what to pack for next Tuesday.
Frequently asked questions
Does Callao get the same every year?
Close to it. Averaging decades smooths variation, so treat these as typical rather than guaranteed.