Ar Rass climate — normals and trends
Ar Rass (Saudi Arabia) has a hot desert climate (BWh) under the Köppen-Geiger classification. Its mean annual temperature is 25.0 °C and it receives 81 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 (34.5 °C on average) and the coldest is January (13.1 °C). Rainfall peaks in November.
Ar Rass averages 2 frost days, 216 hot days (≥ 30 °C) and 15 rainy days per year.
Ar Rass has warmed by +4.0 °C between 1940 and 2025, or +0.47 °C per decade. This trend is statistically significant.
The number of frost days there went from about 4 to 0 per year over the period.
The hottest day of the period reached 47.5 °C (on 11 July 2021) and the coldest -6.3 °C (on 20 January 1964).
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
Ar RassAl-Qassim Region
- coords
- 25.87°, 43.50°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
25.0°C
Average daily high
31.7°C
Average daily low
17.8°C
Annual rainfall
81mm
Sunshine / day
11.2h
Mean relative humidity
28%
Average peak wind
21.3km/h
Seasonal range
21.4°C
Frost days (< 0 °C)
2 d/yr
Hot days (≥ 30 °C)
216 d/yr
Rainy days (≥ 1 mm)
15 d/yr
Annual snowfall
0.0 cm
Average feels-like high
29.2 °C
Average feels-like low
14.1 °C
Average peak gust
34.1 km/h
Tropical nights (≥ 20 °C)
169 d/yr
Solar radiation
22.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+4.0 °C
since 1940
+0.5 °C per decade · r² = 0.79 · 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
47.5 °C
11 July 2021
Coldest day
-6.3 °C
20 January 1964
Wettest day
42 mm
3 March 1987
Windiest day
57.1 km/h
12 April 1956
Strongest gust
92.5 km/h
30 January 1992
Hottest feels-like
47.7 °C
4 August 2022
Coldest feels-like
-11.1 °C
20 January 1964
Snowiest day
0.1 cm
5 December 1986
Sunniest day
12.8 h
30 June 1941
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 | 18.7 °C | -0.6 °C | 11 mm | -2 mm |
| Feb | 20.1 °C | -2.2 °C | 36 mm | +29 mm |
| Mar | 26.5 °C | -0.2 °C | 21 mm | +9 mm |
| Apr | 35.7 °C | +3.9 °C | 2 mm | -11 mm |
| May | 39.8 °C | +2.4 °C | 1 mm | -3 mm |
| Jun | 42.2 °C | +1.7 °C | 0 mm | -0 mm |
| Jul | 42.3 °C | +0.9 °C | 0 mm | 0 mm |
| Aug | 42.8 °C | +1.3 °C | 0 mm | 0 mm |
| Sep | 41.0 °C | +1.7 °C | 2 mm | +2 mm |
| Oct | 35.0 °C | +1.2 °C | 0 mm | -2 mm |
| Nov | 28.1 °C | +2.0 °C | 1 mm | -15 mm |
| Dec | 20.7 °C | +0.2 °C | 51 mm | +36 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 Ar Rass?
Ar Rass has a hot desert climate (Köppen BWh). Over 1940-2025, the average annual temperature is 25.0 °C and it receives 81 mm of precipitation per year.
What is the hottest day ever recorded in Ar Rass?
The hottest day measured in Ar Rass between 1940 and 2025 was 11 July 2021, reaching 47.5 °C.
What is the coldest day in Ar Rass?
The coldest day measured in Ar Rass between 1940 and 2025 was 20 January 1964, at -6.3 °C.
Does it snow in Ar Rass?
Almost never: Ar Rass sees virtually no snow, with about 2 frost days per year.
Has the climate of Ar Rass warmed?
Yes: Ar Rass warmed by +4.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ar Rass?
The wettest day measured in Ar Rass between 1940 and 2025 was 3 March 1987, with 42 mm of rain in 24 hours.
What was the windiest day in Ar Rass?
The windiest day measured in Ar Rass between 1940 and 2025 was 12 April 1956, with winds reaching 57.1 km/h.
What is the warmest month in Ar Rass?
The warmest month in Ar Rass is July (34.5 °C on average); the coldest is January (13.1 °C).
How much does it rain in Ar Rass?
Ar Rass receives on average 81 mm of precipitation per year, spread over about 15 rainy days.
Is it sunny in Ar Rass?
Ar Rass gets on average 11.2 hours of sunshine per day, roughly 4,088 hours per year over 1940-2025.
What is the biggest single-day snowfall in Ar Rass?
The heaviest 24-hour snowfall measured in Ar Rass between 1940 and 2025 was 5 December 1986, with 0.1 cm.
Are there tropical nights in Ar Rass?
Yes: Ar Rass has on average 169 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Ar Rass?
In Ar Rass, between 1940 and 2025, the highest apparent temperature reached 47.7 °C on 4 August 2022, and the lowest was -11.1 °C on 20 January 1964.
Compare Ar Rass with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ar Rass