Chios climate — normals and trends
Chios (Greece) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 17.8 °C and it receives 656 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 July (25.3 °C on average) and the coldest is January (11.1 °C). Rainfall peaks in December.
Chios averages 0 frost days, 5 hot days (≥ 30 °C) and 71 rainy days per year.
Chios has warmed by +1.3 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.
The hottest day of the period reached 33.3 °C (on 25 July 2025) and the coldest -2.0 °C (on 5 January 1942).
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
ChiosNorth Aegean
- coords
- 38.37°, 26.14°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
17.8°C
Average daily high
19.6°C
Average daily low
16.0°C
Annual rainfall
656mm
Sunshine / day
10.9h
Mean relative humidity
70%
Average peak wind
28.1km/h
Seasonal range
14.2°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
5 d/yr
Rainy days (≥ 1 mm)
71 d/yr
Annual snowfall
1.4 cm
Average feels-like high
18.3 °C
Average feels-like low
13.5 °C
Average peak gust
45.1 km/h
Tropical nights (≥ 20 °C)
109 d/yr
Solar radiation
18.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.3 °C
since 1940
+0.2 °C per decade · r² = 0.40 · 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
33.3 °C
25 July 2025
Coldest day
-2.0 °C
5 January 1942
Wettest day
93 mm
14 November 1945
Windiest day
69.1 km/h
2 February 1954
Strongest gust
124.9 km/h
22 January 2004
Hottest feels-like
38.1 °C
24 June 2007
Coldest feels-like
-10.8 °C
9 February 1976
Snowiest day
9.0 cm
5 February 1983
Sunniest day
14.3 h
17 June 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 | 15.4 °C | +2.9 °C | 91 mm | -39 mm |
| Feb | 11.2 °C | -1.6 °C | 80 mm | -15 mm |
| Mar | 16.2 °C | +2.1 °C | 32 mm | -38 mm |
| Apr | 17.3 °C | +0.1 °C | 44 mm | +8 mm |
| May | 21.5 °C | +0.2 °C | 11 mm | -5 mm |
| Jun | 26.9 °C | +1.4 °C | 0 mm | -4 mm |
| Jul | 29.3 °C | +1.6 °C | 0 mm | -1 mm |
| Aug | 28.6 °C | +0.9 °C | 0 mm | -1 mm |
| Sep | 25.4 °C | +0.5 °C | 15 mm | +2 mm |
| Oct | 20.4 °C | -0.5 °C | 87 mm | +37 mm |
| Nov | 19.6 °C | +2.5 °C | 74 mm | -22 mm |
| Dec | 15.1 °C | +1.1 °C | 94 mm | -53 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 Chios?
Chios has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 17.8 °C and it receives 656 mm of precipitation per year.
What is the hottest day ever recorded in Chios?
The hottest day measured in Chios between 1940 and 2025 was 25 July 2025, reaching 33.3 °C.
What is the coldest day in Chios?
The coldest day measured in Chios between 1940 and 2025 was 5 January 1942, at -2.0 °C.
Does it snow in Chios?
Yes. Chios gets on average 1.4 cm of snow per year and has around 0 frost days.
Has the climate of Chios warmed?
Yes: Chios warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Chios?
The wettest day measured in Chios between 1940 and 2025 was 14 November 1945, with 93 mm of rain in 24 hours.
What was the windiest day in Chios?
The windiest day measured in Chios between 1940 and 2025 was 2 February 1954, with winds reaching 69.1 km/h.
What is the warmest month in Chios?
The warmest month in Chios is July (25.3 °C on average); the coldest is January (11.1 °C).
How much does it rain in Chios?
Chios receives on average 656 mm of precipitation per year, spread over about 71 rainy days.
Is it sunny in Chios?
Chios gets on average 10.9 hours of sunshine per day, roughly 3,979 hours per year over 1940-2025.
What is the biggest single-day snowfall in Chios?
The heaviest 24-hour snowfall measured in Chios between 1940 and 2025 was 5 February 1983, with 9.0 cm.
Are there tropical nights in Chios?
Yes: Chios has on average 109 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Chios?
In Chios, between 1940 and 2025, the highest apparent temperature reached 38.1 °C on 24 June 2007, and the lowest was -10.8 °C on 9 February 1976.
Compare Chios with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Chios