Dayr az Zawr climate — normals and trends
Dayr az Zawr (Syria) has a hot desert climate (BWh) under the Köppen-Geiger classification. Its mean annual temperature is 21.0 °C and it receives 138 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 (33.5 °C on average) and the coldest is January (7.6 °C). Rainfall peaks in December.
Dayr az Zawr averages 9 frost days, 166 hot days (≥ 30 °C) and 29 rainy days per year.
Dayr az Zawr has warmed by +2.0 °C between 1940 and 2025, or +0.24 °C per decade. This trend is statistically significant.
The number of frost days there went from about 13 to 5 per year over the period.
The hottest day of the period reached 48.3 °C (on 5 August 1957) and the coldest -9.1 °C (on 6 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
Dayr az ZawrDeir ez-Zor Governorate
- coords
- 35.34°, 40.14°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
21.0°C
Average daily high
27.0°C
Average daily low
15.2°C
Annual rainfall
138mm
Sunshine / day
11.0h
Mean relative humidity
46%
Average peak wind
20.6km/h
Seasonal range
25.9°C
Frost days (< 0 °C)
9 d/yr
Hot days (≥ 30 °C)
166 d/yr
Rainy days (≥ 1 mm)
29 d/yr
Annual snowfall
0.9 cm
Average feels-like high
24.9 °C
Average feels-like low
12.4 °C
Average peak gust
34.7 km/h
Tropical nights (≥ 20 °C)
136 d/yr
Solar radiation
19.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.38 · 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
48.3 °C
5 August 1957
Coldest day
-9.1 °C
6 January 1942
Wettest day
48 mm
15 March 1972
Windiest day
70.9 km/h
8 January 1946
Strongest gust
98.3 km/h
16 March 1998
Hottest feels-like
50.0 °C
24 July 1998
Coldest feels-like
-13.9 °C
19 January 1964
Snowiest day
11.1 cm
10 February 1992
Sunniest day
13.7 h
10 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 | 16.0 °C | +3.6 °C | 2 mm | -22 mm |
| Feb | 14.0 °C | -1.3 °C | 16 mm | -5 mm |
| Mar | 24.0 °C | +4.0 °C | 12 mm | -11 mm |
| Apr | 28.0 °C | +1.7 °C | 5 mm | -11 mm |
| May | 34.9 °C | +2.4 °C | 2 mm | -6 mm |
| Jun | 39.1 °C | +1.7 °C | 0 mm | -0 mm |
| Jul | 41.9 °C | +1.6 °C | 0 mm | 0 mm |
| Aug | 40.8 °C | +0.9 °C | 0 mm | -0 mm |
| Sep | 35.9 °C | -0.1 °C | 0 mm | -0 mm |
| Oct | 30.4 °C | +1.0 °C | 0 mm | -7 mm |
| Nov | 25.0 °C | +4.2 °C | 3 mm | -13 mm |
| Dec | 14.9 °C | +0.8 °C | 39 mm | +14 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 Dayr az Zawr?
Dayr az Zawr has a hot desert climate (Köppen BWh). Over 1940-2025, the average annual temperature is 21.0 °C and it receives 138 mm of precipitation per year.
What is the hottest day ever recorded in Dayr az Zawr?
The hottest day measured in Dayr az Zawr between 1940 and 2025 was 5 August 1957, reaching 48.3 °C.
What is the coldest day in Dayr az Zawr?
The coldest day measured in Dayr az Zawr between 1940 and 2025 was 6 January 1942, at -9.1 °C.
Does it snow in Dayr az Zawr?
Almost never: Dayr az Zawr sees virtually no snow, with about 9 frost days per year.
Has the climate of Dayr az Zawr warmed?
Yes: Dayr az Zawr warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Dayr az Zawr?
The wettest day measured in Dayr az Zawr between 1940 and 2025 was 15 March 1972, with 48 mm of rain in 24 hours.
What was the windiest day in Dayr az Zawr?
The windiest day measured in Dayr az Zawr between 1940 and 2025 was 8 January 1946, with winds reaching 70.9 km/h.
What is the warmest month in Dayr az Zawr?
The warmest month in Dayr az Zawr is July (33.5 °C on average); the coldest is January (7.6 °C).
How much does it rain in Dayr az Zawr?
Dayr az Zawr receives on average 138 mm of precipitation per year, spread over about 29 rainy days.
Is it sunny in Dayr az Zawr?
Dayr az Zawr gets on average 11.0 hours of sunshine per day, roughly 4,015 hours per year over 1940-2025.
What is the biggest single-day snowfall in Dayr az Zawr?
The heaviest 24-hour snowfall measured in Dayr az Zawr between 1940 and 2025 was 10 February 1992, with 11.1 cm.
Are there tropical nights in Dayr az Zawr?
Yes: Dayr az Zawr has on average 136 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Dayr az Zawr?
In Dayr az Zawr, between 1940 and 2025, the highest apparent temperature reached 50.0 °C on 24 July 1998, and the lowest was -13.9 °C on 19 January 1964.
Compare Dayr az Zawr with another city
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Nearby cities
The climate around Dayr az Zawr