Rosana climate — normals and trends
Rosana (Brazil) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 23.6 °C and it receives 1,309 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 (26.4 °C on average) and the coldest is July (19.4 °C). Rainfall peaks in January.
Rosana averages 0 frost days, 123 hot days (≥ 30 °C) and 139 rainy days per year.
Rosana has warmed by +1.5 °C between 1940 and 2025, or +0.17 °C per decade. This trend is statistically significant.
The hottest day of the period reached 41.3 °C (on 3 October 2020) and the coldest 2.5 °C (on 18 July 1975).
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
RosanaSão Paulo
- coords
- -22.58°, -53.06°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
23.6°C
Average daily high
28.1°C
Average daily low
20.1°C
Annual rainfall
1,309mm
Sunshine / day
9.9h
Mean relative humidity
73%
Average peak wind
13.4km/h
Seasonal range
7.0°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
123 d/yr
Rainy days (≥ 1 mm)
139 d/yr
Annual snowfall
0.0 cm
Average feels-like high
30.8 °C
Average feels-like low
21.5 °C
Average peak gust
30.1 km/h
Tropical nights (≥ 20 °C)
211 d/yr
Solar radiation
18.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.5 °C
since 1940
+0.2 °C per decade · r² = 0.46 · 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
41.3 °C
3 October 2020
Coldest day
2.5 °C
18 July 1975
Wettest day
117 mm
26 September 1971
Windiest day
50.4 km/h
15 September 1956
Strongest gust
79.2 km/h
7 October 2010
Hottest feels-like
44.5 °C
17 November 1985
Coldest feels-like
-2.0 °C
18 July 1975
Sunniest day
13.0 h
30 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 | 32.7 °C | +2.2 °C | 83 mm | -110 mm |
| Feb | 32.3 °C | +1.9 °C | 100 mm | -67 mm |
| Mar | 32.8 °C | +2.8 °C | 44 mm | -81 mm |
| Apr | 27.7 °C | -0.5 °C | 185 mm | +107 mm |
| May | 27.2 °C | +1.9 °C | 28 mm | -54 mm |
| Jun | 24.1 °C | 0.0 °C | 64 mm | +1 mm |
| Jul | 24.7 °C | +0.4 °C | 9 mm | -36 mm |
| Aug | 26.7 °C | +0.3 °C | 26 mm | -18 mm |
| Sep | 31.2 °C | +2.9 °C | 27 mm | -50 mm |
| Oct | 28.8 °C | -0.5 °C | 131 mm | -4 mm |
| Nov | 29.8 °C | 0.0 °C | 179 mm | +51 mm |
| Dec | 31.0 °C | +0.8 °C | 224 mm | +51 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 Rosana?
Rosana has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 23.6 °C and it receives 1,309 mm of precipitation per year.
What is the hottest day ever recorded in Rosana?
The hottest day measured in Rosana between 1940 and 2025 was 3 October 2020, reaching 41.3 °C.
What is the coldest day in Rosana?
The coldest day measured in Rosana between 1940 and 2025 was 18 July 1975, at 2.5 °C.
Does it snow in Rosana?
Almost never: Rosana sees virtually no snow, with about 0 frost days per year.
Has the climate of Rosana warmed?
Yes: Rosana warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Rosana?
The wettest day measured in Rosana between 1940 and 2025 was 26 September 1971, with 117 mm of rain in 24 hours.
What was the windiest day in Rosana?
The windiest day measured in Rosana between 1940 and 2025 was 15 September 1956, with winds reaching 50.4 km/h.
What is the warmest month in Rosana?
The warmest month in Rosana is January (26.4 °C on average); the coldest is July (19.4 °C).
How much does it rain in Rosana?
Rosana receives on average 1,309 mm of precipitation per year, spread over about 139 rainy days.
Is it sunny in Rosana?
Rosana gets on average 9.9 hours of sunshine per day, roughly 3,614 hours per year over 1940-2025.
Are there tropical nights in Rosana?
Yes: Rosana has on average 211 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Rosana?
In Rosana, between 1940 and 2025, the highest apparent temperature reached 44.5 °C on 17 November 1985, and the lowest was -2.0 °C on 18 July 1975.
Compare Rosana with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Rosana