Rio climate — normals and trends
Rio (Greece) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 15.9 °C and it receives 940 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 (25.2 °C on average) and the coldest is January (7.9 °C). Rainfall peaks in December.
Rio averages 3 frost days, 38 hot days (≥ 30 °C) and 110 rainy days per year.
Rio 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 39.0 °C (on 8 July 1988) and the coldest -9.8 °C (on 14 January 1968).
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
RioWest Greece
- coords
- 38.30°, 21.79°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.9°C
Average daily high
19.8°C
Average daily low
12.5°C
Annual rainfall
940mm
Sunshine / day
10.2h
Mean relative humidity
74%
Average peak wind
11.5km/h
Seasonal range
17.3°C
Frost days (< 0 °C)
3 d/yr
Hot days (≥ 30 °C)
38 d/yr
Rainy days (≥ 1 mm)
110 d/yr
Annual snowfall
3.9 cm
Average feels-like high
19.8 °C
Average feels-like low
12.0 °C
Average peak gust
34.4 km/h
Tropical nights (≥ 20 °C)
52 d/yr
Solar radiation
16.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.0 °C
since 1940
+0.1 °C per decade · r² = 0.26 · 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
39.0 °C
8 July 1988
Coldest day
-9.8 °C
14 January 1968
Wettest day
98 mm
20 November 1999
Windiest day
36.2 km/h
14 February 1962
Strongest gust
121.3 km/h
14 February 1962
Hottest feels-like
43.6 °C
7 July 1988
Coldest feels-like
-14.1 °C
14 January 1968
Snowiest day
17.4 cm
5 January 1946
Sunniest day
14.6 h
18 June 2012
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 | 13.6 °C | +2.6 °C | 65 mm | -72 mm |
| Feb | 11.6 °C | -0.1 °C | 54 mm | -62 mm |
| Mar | 16.9 °C | +3.2 °C | 55 mm | -42 mm |
| Apr | 18.0 °C | +0.8 °C | 43 mm | -32 mm |
| May | 22.9 °C | +1.0 °C | 39 mm | -12 mm |
| Jun | 30.7 °C | +4.3 °C | 8 mm | -17 mm |
| Jul | 32.0 °C | +2.5 °C | 0 mm | -12 mm |
| Aug | 30.8 °C | +0.9 °C | 11 mm | -3 mm |
| Sep | 27.9 °C | +1.8 °C | 45 mm | +3 mm |
| Oct | 19.5 °C | -1.7 °C | 171 mm | +87 mm |
| Nov | 18.1 °C | +1.7 °C | 138 mm | +1 mm |
| Dec | 14.3 °C | +1.9 °C | 87 mm | -62 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 Rio?
Rio has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 15.9 °C and it receives 940 mm of precipitation per year.
What is the hottest day ever recorded in Rio?
The hottest day measured in Rio between 1940 and 2025 was 8 July 1988, reaching 39.0 °C.
What is the coldest day in Rio?
The coldest day measured in Rio between 1940 and 2025 was 14 January 1968, at -9.8 °C.
Does it snow in Rio?
Yes. Rio gets on average 3.9 cm of snow per year and has around 3 frost days.
Has the climate of Rio warmed?
Yes: Rio warmed by +1.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Rio?
The wettest day measured in Rio between 1940 and 2025 was 20 November 1999, with 98 mm of rain in 24 hours.
What was the windiest day in Rio?
The windiest day measured in Rio between 1940 and 2025 was 14 February 1962, with winds reaching 36.2 km/h.
What is the warmest month in Rio?
The warmest month in Rio is August (25.2 °C on average); the coldest is January (7.9 °C).
How much does it rain in Rio?
Rio receives on average 940 mm of precipitation per year, spread over about 110 rainy days.
Is it sunny in Rio?
Rio gets on average 10.2 hours of sunshine per day, roughly 3,723 hours per year over 1940-2025.
What is the biggest single-day snowfall in Rio?
The heaviest 24-hour snowfall measured in Rio between 1940 and 2025 was 5 January 1946, with 17.4 cm.
Are there tropical nights in Rio?
Yes: Rio has on average 52 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Rio?
In Rio, between 1940 and 2025, the highest apparent temperature reached 43.6 °C on 7 July 1988, and the lowest was -14.1 °C on 14 January 1968.
Compare Rio with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Rio