Everything below is collected in one spot so you do not have to cross-check Antananarivo climate: monthly averages by hand. The gap between Jul and Dec is 7.0 C here: 12.4 C against 19.4 C. Precipitation peaks in Jan (15.31 mm/day) and bottoms out in Sep (1.55 mm/day), so a 9.9x difference between the two. Taken together that is roughly 2,390 mm of rain a year for the grid cell. Values come from a public open API; a successful result is cached so a later outage never blanks the page. Exact monthly values are in the table; links below cover adjacent locations and years.
Annual mean temperature 16.5 C
Warmest month Dec (19.4 C)
Coldest month Jul (12.4 C)
Wettest month Jan (15.31 mm/day)
All-time record high 28.3 C
All-time record low 3.5 C
Annual precipitation 2,380 mm / year
Coordinates -18.9137, 47.5361
Population 1,349,501
Average monthly temperature and rainfall in Antananarivo
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
19.2
15.31
26.8
11.6
Feb
19.1
13.41
27.2
10.7
Mar
18.7
9.82
26.9
9.9
Apr
17.4
5.31
25.5
8.3
May
15.5
2.76
24.2
5.3
Jun
13.2
2.80
22.9
3.5
Jul
12.4
2.75
22.8
4.9
Aug
13.1
1.88
23.2
4.4
Sep
14.8
1.55
26.6
4.8
Oct
17.2
3.11
28.3
7.2
Nov
18.7
7.41
28.2
7.4
Dec
19.4
12.52
28.2
11.0
What the Antananarivo climate table shows
Values are multi-decadal climatological averages for the -18.9137, 47.5361 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
Why do the numbers differ from a weather app?
An app shows one location on one day. These are long-run averages, so they smooth out single hot or cold spells.
How much rain is 15.31 mm/day in a month?
Rain is recorded as a daily mean, so 15.31 mm/day is roughly 465 mm across a 30-day month.