Oleiros climate — normals and trends
Oleiros (Portugal) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 13.4 °C and it receives 1,083 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 August (20.8 °C on average) and the coldest is January (6.8 °C). Rainfall peaks in December.
Oleiros averages 13 frost days, 24 hot days (≥ 30 °C) and 109 rainy days per year.
Oleiros has warmed by +1.2 °C between 1940 and 2025, or +0.14 °C per decade. This trend is statistically significant.
The number of frost days there went from about 20 to 6 per year over the period.
The hottest day of the period reached 39.4 °C (on 1 August 2003) and the coldest -8.0 °C (on 30 January 1947).
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
OleirosCastelo Branco District
- coords
- 39.92°, -7.91°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
13.4°C
Average daily high
18.3°C
Average daily low
9.0°C
Annual rainfall
1,083mm
Sunshine / day
10.0h
Mean relative humidity
75%
Average peak wind
16.0km/h
Seasonal range
14.0°C
Frost days (< 0 °C)
13 d/yr
Hot days (≥ 30 °C)
24 d/yr
Rainy days (≥ 1 mm)
109 d/yr
Annual snowfall
2.7 cm
Average feels-like high
17.1 °C
Average feels-like low
7.1 °C
Average peak gust
38.8 km/h
Tropical nights (≥ 20 °C)
4 d/yr
Solar radiation
16.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.2 °C
since 1940
+0.1 °C per decade · r² = 0.16 · 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
39.4 °C
1 August 2003
Coldest day
-8.0 °C
30 January 1947
Wettest day
108 mm
24 November 2006
Windiest day
49.4 km/h
27 February 2010
Strongest gust
134.6 km/h
30 December 1981
Hottest feels-like
40.4 °C
3 August 2018
Coldest feels-like
-12.9 °C
12 February 1983
Snowiest day
24.3 cm
23 February 1956
Sunniest day
14.8 h
28 June 2025
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 | 12.4 °C | +1.9 °C | 285 mm | +152 mm |
| Feb | 13.5 °C | +1.6 °C | 56 mm | -67 mm |
| Mar | 14.0 °C | -0.5 °C | 245 mm | +128 mm |
| Apr | 17.5 °C | +1.0 °C | 179 mm | +76 mm |
| May | 21.2 °C | +1.7 °C | 68 mm | -22 mm |
| Jun | 28.3 °C | +4.5 °C | 11 mm | -32 mm |
| Jul | 29.7 °C | +2.5 °C | 6 mm | -8 mm |
| Aug | 30.7 °C | +3.2 °C | 2 mm | -13 mm |
| Sep | 24.6 °C | +0.2 °C | 45 mm | -10 mm |
| Oct | 22.1 °C | +2.9 °C | 121 mm | -0 mm |
| Nov | 14.3 °C | +0.3 °C | 308 mm | +176 mm |
| Dec | 11.3 °C | +0.2 °C | 147 mm | +9 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 Oleiros?
Oleiros has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 13.4 °C and it receives 1,083 mm of precipitation per year.
What is the hottest day ever recorded in Oleiros?
The hottest day measured in Oleiros between 1940 and 2025 was 1 August 2003, reaching 39.4 °C.
What is the coldest day in Oleiros?
The coldest day measured in Oleiros between 1940 and 2025 was 30 January 1947, at -8.0 °C.
Does it snow in Oleiros?
Yes. Oleiros gets on average 2.7 cm of snow per year and has around 13 frost days.
Has the climate of Oleiros warmed?
Yes: Oleiros warmed by +1.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Oleiros?
The wettest day measured in Oleiros between 1940 and 2025 was 24 November 2006, with 108 mm of rain in 24 hours.
What was the windiest day in Oleiros?
The windiest day measured in Oleiros between 1940 and 2025 was 27 February 2010, with winds reaching 49.4 km/h.
What is the warmest month in Oleiros?
The warmest month in Oleiros is August (20.8 °C on average); the coldest is January (6.8 °C).
How much does it rain in Oleiros?
Oleiros receives on average 1,083 mm of precipitation per year, spread over about 109 rainy days.
Is it sunny in Oleiros?
Oleiros gets on average 10.0 hours of sunshine per day, roughly 3,650 hours per year over 1940-2025.
What is the biggest single-day snowfall in Oleiros?
The heaviest 24-hour snowfall measured in Oleiros between 1940 and 2025 was 23 February 1956, with 24.3 cm.
Are there tropical nights in Oleiros?
Yes: Oleiros has on average 4 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Oleiros?
In Oleiros, between 1940 and 2025, the highest apparent temperature reached 40.4 °C on 3 August 2018, and the lowest was -12.9 °C on 12 February 1983.
Compare Oleiros with another city
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Nearby cities
The climate around Oleiros