Marathon climate — normals and trends
Marathon (Greece) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 17.0 °C and it receives 492 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 (26.5 °C on average) and the coldest is January (8.3 °C). Rainfall peaks in December.
Marathon averages 3 frost days, 62 hot days (≥ 30 °C) and 77 rainy days per year.
Marathon has warmed by +1.5 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.
The hottest day of the period reached 43.1 °C (on 26 June 2007) and the coldest -9.9 °C (on 24 January 2004).
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
MarathonAttica
- coords
- 38.15°, 23.96°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
17.0°C
Average daily high
21.4°C
Average daily low
12.9°C
Annual rainfall
492mm
Sunshine / day
10.2h
Mean relative humidity
66%
Average peak wind
16.5km/h
Seasonal range
18.2°C
Frost days (< 0 °C)
3 d/yr
Hot days (≥ 30 °C)
62 d/yr
Rainy days (≥ 1 mm)
77 d/yr
Annual snowfall
9.5 cm
Average feels-like high
20.3 °C
Average feels-like low
11.6 °C
Average peak gust
38.3 km/h
Tropical nights (≥ 20 °C)
67 d/yr
Solar radiation
16.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.5 °C
since 1940
+0.2 °C per decade · r² = 0.46 · 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
43.1 °C
26 June 2007
Coldest day
-9.9 °C
24 January 2004
Wettest day
117 mm
26 March 1998
Windiest day
45.1 km/h
22 February 1940
Strongest gust
99.7 km/h
24 January 1949
Hottest feels-like
44.7 °C
26 July 2023
Coldest feels-like
-15.0 °C
24 January 2004
Snowiest day
21.0 cm
5 February 1983
Sunniest day
14.6 h
24 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 | 15.0 °C | +3.1 °C | 46 mm | -27 mm |
| Feb | 10.8 °C | -2.2 °C | 61 mm | -1 mm |
| Mar | 17.6 °C | +2.3 °C | 54 mm | -3 mm |
| Apr | 18.1 °C | -1.8 °C | 74 mm | +37 mm |
| May | 24.4 °C | -0.5 °C | 17 mm | -13 mm |
| Jun | 29.6 °C | +0.1 °C | 4 mm | -13 mm |
| Jul | 33.0 °C | +1.8 °C | 1 mm | -9 mm |
| Aug | 30.0 °C | -0.8 °C | 6 mm | -2 mm |
| Sep | 26.9 °C | -0.4 °C | 13 mm | -10 mm |
| Oct | 21.2 °C | -1.1 °C | 46 mm | -2 mm |
| Nov | 19.8 °C | +2.1 °C | 48 mm | -7 mm |
| Dec | 14.7 °C | +1.2 °C | 92 mm | +18 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 Marathon?
Marathon has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 17.0 °C and it receives 492 mm of precipitation per year.
What is the hottest day ever recorded in Marathon?
The hottest day measured in Marathon between 1940 and 2025 was 26 June 2007, reaching 43.1 °C.
What is the coldest day in Marathon?
The coldest day measured in Marathon between 1940 and 2025 was 24 January 2004, at -9.9 °C.
Does it snow in Marathon?
Yes. Marathon gets on average 9.5 cm of snow per year and has around 3 frost days.
Has the climate of Marathon warmed?
Yes: Marathon warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Marathon?
The wettest day measured in Marathon between 1940 and 2025 was 26 March 1998, with 117 mm of rain in 24 hours.
What was the windiest day in Marathon?
The windiest day measured in Marathon between 1940 and 2025 was 22 February 1940, with winds reaching 45.1 km/h.
What is the warmest month in Marathon?
The warmest month in Marathon is July (26.5 °C on average); the coldest is January (8.3 °C).
How much does it rain in Marathon?
Marathon receives on average 492 mm of precipitation per year, spread over about 77 rainy days.
Is it sunny in Marathon?
Marathon 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 Marathon?
The heaviest 24-hour snowfall measured in Marathon between 1940 and 2025 was 5 February 1983, with 21.0 cm.
Are there tropical nights in Marathon?
Yes: Marathon has on average 67 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Marathon?
In Marathon, between 1940 and 2025, the highest apparent temperature reached 44.7 °C on 26 July 2023, and the lowest was -15.0 °C on 24 January 2004.
Compare Marathon with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Marathon