Altônia climate — normals and trends
Altônia (Brazil) has a tropical rainforest climate (Af) under the Köppen-Geiger classification. Its mean annual temperature is 22.9 °C and it receives 1,449 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 (26.3 °C on average) and the coldest is July (18.3 °C). Rainfall peaks in October.
Altônia averages 0 frost days, 93 hot days (≥ 30 °C) and 134 rainy days per year.
Altônia has warmed by +1.0 °C between 1940 and 2025, or +0.12 °C per decade. This trend is statistically significant.
The hottest day of the period reached 39.8 °C (on 13 October 2014) 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
AltôniaParaná
- coords
- -23.87°, -53.90°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
22.9°C
Average daily high
27.0°C
Average daily low
19.5°C
Annual rainfall
1,449mm
Sunshine / day
9.5h
Mean relative humidity
75%
Average peak wind
13.9km/h
Seasonal range
8.0°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
93 d/yr
Rainy days (≥ 1 mm)
134 d/yr
Annual snowfall
0.0 cm
Average feels-like high
29.5 °C
Average feels-like low
20.8 °C
Average peak gust
30.3 km/h
Tropical nights (≥ 20 °C)
193 d/yr
Solar radiation
17.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.0 °C
since 1940
+0.1 °C per decade · r² = 0.28 · 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
39.8 °C
13 October 2014
Coldest day
2.5 °C
18 July 1975
Wettest day
136 mm
4 January 1940
Windiest day
55.6 km/h
15 September 1956
Strongest gust
95.0 km/h
20 June 1991
Hottest feels-like
44.6 °C
23 January 2022
Coldest feels-like
-1.9 °C
18 July 1975
Sunniest day
13.2 h
7 January 1942
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 31.9 °C | +1.7 °C | 63 mm | -95 mm |
| Feb | 32.0 °C | +2.0 °C | 45 mm | -96 mm |
| Mar | 31.4 °C | +2.0 °C | 67 mm | -41 mm |
| Apr | 26.3 °C | -0.9 °C | 220 mm | +125 mm |
| May | 25.9 °C | +1.8 °C | 62 mm | -53 mm |
| Jun | 21.8 °C | -0.8 °C | 148 mm | +47 mm |
| Jul | 23.2 °C | +0.5 °C | 19 mm | -64 mm |
| Aug | 24.4 °C | -0.2 °C | 77 mm | +2 mm |
| Sep | 27.8 °C | +1.4 °C | 57 mm | -57 mm |
| Oct | 27.3 °C | -0.7 °C | 170 mm | +5 mm |
| Nov | 28.8 °C | -0.2 °C | 221 mm | +83 mm |
| Dec | 30.0 °C | +0.2 °C | 239 mm | +83 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 Altônia?
Altônia has a tropical rainforest climate (Köppen Af). Over 1940-2025, the average annual temperature is 22.9 °C and it receives 1,449 mm of precipitation per year.
What is the hottest day ever recorded in Altônia?
The hottest day measured in Altônia between 1940 and 2025 was 13 October 2014, reaching 39.8 °C.
What is the coldest day in Altônia?
The coldest day measured in Altônia between 1940 and 2025 was 18 July 1975, at 2.5 °C.
Does it snow in Altônia?
Almost never: Altônia sees virtually no snow, with about 0 frost days per year.
Has the climate of Altônia warmed?
Yes: Altônia warmed by +1.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Altônia?
The wettest day measured in Altônia between 1940 and 2025 was 4 January 1940, with 136 mm of rain in 24 hours.
What was the windiest day in Altônia?
The windiest day measured in Altônia between 1940 and 2025 was 15 September 1956, with winds reaching 55.6 km/h.
What is the warmest month in Altônia?
The warmest month in Altônia is January (26.3 °C on average); the coldest is July (18.3 °C).
How much does it rain in Altônia?
Altônia receives on average 1,449 mm of precipitation per year, spread over about 134 rainy days.
Is it sunny in Altônia?
Altônia gets on average 9.5 hours of sunshine per day, roughly 3,468 hours per year over 1940-2025.
Are there tropical nights in Altônia?
Yes: Altônia has on average 193 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Altônia?
In Altônia, between 1940 and 2025, the highest apparent temperature reached 44.6 °C on 23 January 2022, and the lowest was -1.9 °C on 18 July 1975.
Compare Altônia with another city
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Nearby cities
The climate around Altônia