Castro climate — normals and trends
Castro (Brazil) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 17.4 °C and it receives 1,469 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 (20.5 °C on average) and the coldest is July (13.5 °C). Rainfall peaks in January.
Castro averages 1 frost days, 3 hot days (≥ 30 °C) and 168 rainy days per year.
Castro has warmed by +1.4 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.
The number of frost days there went from about 0 to 2 per year over the period.
The hottest day of the period reached 33.7 °C (on 2 October 2020) and the coldest -5.4 °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
CastroParaná
- coords
- -24.79°, -50.01°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
17.4°C
Average daily high
22.3°C
Average daily low
13.5°C
Annual rainfall
1,469mm
Sunshine / day
9.1h
Mean relative humidity
82%
Average peak wind
16.1km/h
Seasonal range
7.0°C
Frost days (< 0 °C)
1 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
168 d/yr
Annual snowfall
0.0 cm
Average feels-like high
23.1 °C
Average feels-like low
12.8 °C
Average peak gust
35.3 km/h
Tropical nights (≥ 20 °C)
2 d/yr
Solar radiation
16.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.4 °C
since 1940
+0.2 °C per decade · r² = 0.48 · 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
33.7 °C
2 October 2020
Coldest day
-5.4 °C
18 July 1975
Wettest day
109 mm
10 December 1947
Windiest day
45.9 km/h
15 September 1956
Strongest gust
99.7 km/h
19 June 1991
Hottest feels-like
37.3 °C
7 January 1970
Coldest feels-like
-10.4 °C
18 July 1975
Snowiest day
0.4 cm
20 July 1981
Sunniest day
13.5 h
13 December 1947
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 | 25.4 °C | +0.2 °C | 289 mm | +82 mm |
| Feb | 27.0 °C | +1.9 °C | 178 mm | -1 mm |
| Mar | 26.2 °C | +1.7 °C | 108 mm | -30 mm |
| Apr | 22.0 °C | -0.5 °C | 119 mm | +45 mm |
| May | 20.8 °C | +0.9 °C | 63 mm | -21 mm |
| Jun | 18.2 °C | -0.5 °C | 126 mm | +43 mm |
| Jul | 17.8 °C | -0.8 °C | 44 mm | -28 mm |
| Aug | 19.8 °C | -0.7 °C | 36 mm | -33 mm |
| Sep | 23.0 °C | +1.3 °C | 54 mm | -59 mm |
| Oct | 21.5 °C | -1.2 °C | 201 mm | +55 mm |
| Nov | 23.7 °C | -0.1 °C | 126 mm | -8 mm |
| Dec | 26.4 °C | +1.8 °C | 138 mm | -30 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 Castro?
Castro has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 17.4 °C and it receives 1,469 mm of precipitation per year.
What is the hottest day ever recorded in Castro?
The hottest day measured in Castro between 1940 and 2025 was 2 October 2020, reaching 33.7 °C.
What is the coldest day in Castro?
The coldest day measured in Castro between 1940 and 2025 was 18 July 1975, at -5.4 °C.
Does it snow in Castro?
Almost never: Castro sees virtually no snow, with about 1 frost days per year.
Has the climate of Castro warmed?
Yes: Castro warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Castro?
The wettest day measured in Castro between 1940 and 2025 was 10 December 1947, with 109 mm of rain in 24 hours.
What was the windiest day in Castro?
The windiest day measured in Castro between 1940 and 2025 was 15 September 1956, with winds reaching 45.9 km/h.
What is the warmest month in Castro?
The warmest month in Castro is January (20.5 °C on average); the coldest is July (13.5 °C).
How much does it rain in Castro?
Castro receives on average 1,469 mm of precipitation per year, spread over about 168 rainy days.
Is it sunny in Castro?
Castro gets on average 9.1 hours of sunshine per day, roughly 3,322 hours per year over 1940-2025.
What is the biggest single-day snowfall in Castro?
The heaviest 24-hour snowfall measured in Castro between 1940 and 2025 was 20 July 1981, with 0.4 cm.
Are there tropical nights in Castro?
Yes: Castro has on average 2 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Castro?
In Castro, between 1940 and 2025, the highest apparent temperature reached 37.3 °C on 7 January 1970, and the lowest was -10.4 °C on 18 July 1975.
Compare Castro with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Castro