Imerimandroso climate — normals and trends
Imerimandroso (Madagascar) has a humid subtropical, dry winter climate (Cwa) under the Köppen-Geiger classification. Its mean annual temperature is 19.6 °C and it receives 1,060 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 January (22.0 °C on average) and the coldest is July (16.1 °C). Rainfall peaks in January.
Imerimandroso averages 0 frost days, 9 hot days (≥ 30 °C) and 145 rainy days per year.
Imerimandroso has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.
The hottest day of the period reached 34.6 °C (on 20 December 2024) and the coldest 5.2 °C (on 31 August 1969).
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
ImerimandrosoAlaotra Mangoro
- coords
- -17.43°, 48.58°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
19.6°C
Average daily high
24.5°C
Average daily low
16.2°C
Annual rainfall
1,060mm
Sunshine / day
9.7h
Mean relative humidity
81%
Average peak wind
15.7km/h
Seasonal range
5.9°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
9 d/yr
Rainy days (≥ 1 mm)
145 d/yr
Annual snowfall
0.0 cm
Average feels-like high
25.4 °C
Average feels-like low
17.0 °C
Average peak gust
36.3 km/h
Tropical nights (≥ 20 °C)
20 d/yr
Solar radiation
17.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.75 · p = < 0.001
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
34.6 °C
20 December 2024
Coldest day
5.2 °C
31 August 1969
Wettest day
249 mm
17 February 2008
Windiest day
51.8 km/h
2 February 1994
Strongest gust
137.2 km/h
17 February 2008
Hottest feels-like
38.8 °C
20 December 2024
Coldest feels-like
2.9 °C
31 August 1969
Sunniest day
12.9 h
26 November 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 | 29.3 °C | +2.6 °C | 142 mm | -116 mm |
| Feb | 28.2 °C | +1.6 °C | 376 mm | +151 mm |
| Mar | 27.2 °C | +1.1 °C | 130 mm | -42 mm |
| Apr | 27.6 °C | +2.4 °C | 28 mm | -28 mm |
| May | 24.6 °C | +1.1 °C | 19 mm | -3 mm |
| Jun | 22.6 °C | +1.1 °C | 16 mm | -1 mm |
| Jul | 20.9 °C | +0.3 °C | 17 mm | -0 mm |
| Aug | 22.3 °C | +1.2 °C | 9 mm | -7 mm |
| Sep | 24.6 °C | +1.7 °C | 3 mm | -9 mm |
| Oct | 26.4 °C | +1.1 °C | 9 mm | -14 mm |
| Nov | 28.1 °C | +1.1 °C | 162 mm | +93 mm |
| Dec | 26.7 °C | -0.4 °C | 274 mm | +98 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 Imerimandroso?
Imerimandroso has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 19.6 °C and it receives 1,060 mm of precipitation per year.
What is the hottest day ever recorded in Imerimandroso?
The hottest day measured in Imerimandroso between 1940 and 2025 was 20 December 2024, reaching 34.6 °C.
What is the coldest day in Imerimandroso?
The coldest day measured in Imerimandroso between 1940 and 2025 was 31 August 1969, at 5.2 °C.
Does it snow in Imerimandroso?
Almost never: Imerimandroso sees virtually no snow, with about 0 frost days per year.
Has the climate of Imerimandroso warmed?
Yes: Imerimandroso warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Imerimandroso?
The wettest day measured in Imerimandroso between 1940 and 2025 was 17 February 2008, with 249 mm of rain in 24 hours.
What was the windiest day in Imerimandroso?
The windiest day measured in Imerimandroso between 1940 and 2025 was 2 February 1994, with winds reaching 51.8 km/h.
What is the warmest month in Imerimandroso?
The warmest month in Imerimandroso is January (22.0 °C on average); the coldest is July (16.1 °C).
How much does it rain in Imerimandroso?
Imerimandroso receives on average 1,060 mm of precipitation per year, spread over about 145 rainy days.
Is it sunny in Imerimandroso?
Imerimandroso gets on average 9.7 hours of sunshine per day, roughly 3,540 hours per year over 1940-2025.
Are there tropical nights in Imerimandroso?
Yes: Imerimandroso has on average 20 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Imerimandroso?
In Imerimandroso, between 1940 and 2025, the highest apparent temperature reached 38.8 °C on 20 December 2024, and the lowest was 2.9 °C on 31 August 1969.
Compare Imerimandroso with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Imerimandroso