De Aar climate — normals and trends
De Aar (South Africa) has a cold semi-arid climate (BSk) under the Köppen-Geiger classification. Its mean annual temperature is 16.6 °C and it receives 342 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 January (23.8 °C on average) and the coldest is July (8.3 °C). Rainfall peaks in February.
De Aar averages 20 frost days, 81 hot days (≥ 30 °C) and 53 rainy days per year.
De Aar has warmed by +1.4 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.
The hottest day of the period reached 42.3 °C (on 5 January 2016) and the coldest -6.9 °C (on 17 July 2017).
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
De AarNorthern Cape
- coords
- -30.65°, 24.01°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.6°C
Average daily high
24.0°C
Average daily low
10.0°C
Annual rainfall
342mm
Sunshine / day
11.2h
Mean relative humidity
47%
Average peak wind
23.8km/h
Seasonal range
15.5°C
Frost days (< 0 °C)
20 d/yr
Hot days (≥ 30 °C)
81 d/yr
Rainy days (≥ 1 mm)
53 d/yr
Annual snowfall
0.6 cm
Average feels-like high
21.2 °C
Average feels-like low
6.7 °C
Average peak gust
43.8 km/h
Tropical nights (≥ 20 °C)
10 d/yr
Solar radiation
21.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.4 °C
since 1940
+0.2 °C per decade · r² = 0.29 · 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
42.3 °C
5 January 2016
Coldest day
-6.9 °C
17 July 2017
Wettest day
60 mm
3 March 1974
Windiest day
69.2 km/h
2 December 1943
Strongest gust
103.3 km/h
22 September 1987
Hottest feels-like
40.2 °C
6 January 1993
Coldest feels-like
-12.4 °C
5 August 1943
Snowiest day
6.9 cm
3 June 2024
Sunniest day
13.8 h
30 December 1972
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 | 34.7 °C | +3.6 °C | 18 mm | -31 mm |
| Feb | 31.4 °C | +1.4 °C | 54 mm | +2 mm |
| Mar | 27.4 °C | -0.2 °C | 111 mm | +59 mm |
| Apr | 22.7 °C | -0.5 °C | 86 mm | +52 mm |
| May | 20.2 °C | +0.8 °C | 4 mm | -18 mm |
| Jun | 16.6 °C | +0.6 °C | 13 mm | +0 mm |
| Jul | 17.1 °C | +0.9 °C | 12 mm | +3 mm |
| Aug | 20.6 °C | +2.0 °C | 12 mm | +3 mm |
| Sep | 24.8 °C | +2.2 °C | 35 mm | +22 mm |
| Oct | 27.8 °C | +2.2 °C | 12 mm | -12 mm |
| Nov | 29.7 °C | +1.7 °C | 37 mm | +4 mm |
| Dec | 32.1 °C | +1.8 °C | 43 mm | +9 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 De Aar?
De Aar has a cold semi-arid climate (Köppen BSk). Over 1940-2025, the average annual temperature is 16.6 °C and it receives 342 mm of precipitation per year.
What is the hottest day ever recorded in De Aar?
The hottest day measured in De Aar between 1940 and 2025 was 5 January 2016, reaching 42.3 °C.
What is the coldest day in De Aar?
The coldest day measured in De Aar between 1940 and 2025 was 17 July 2017, at -6.9 °C.
Does it snow in De Aar?
Almost never: De Aar sees virtually no snow, with about 20 frost days per year.
Has the climate of De Aar warmed?
Yes: De Aar warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in De Aar?
The wettest day measured in De Aar between 1940 and 2025 was 3 March 1974, with 60 mm of rain in 24 hours.
What was the windiest day in De Aar?
The windiest day measured in De Aar between 1940 and 2025 was 2 December 1943, with winds reaching 69.2 km/h.
What is the warmest month in De Aar?
The warmest month in De Aar is January (23.8 °C on average); the coldest is July (8.3 °C).
How much does it rain in De Aar?
De Aar receives on average 342 mm of precipitation per year, spread over about 53 rainy days.
Is it sunny in De Aar?
De Aar 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 De Aar?
The heaviest 24-hour snowfall measured in De Aar between 1940 and 2025 was 3 June 2024, with 6.9 cm.
Are there tropical nights in De Aar?
Yes: De Aar has on average 10 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in De Aar?
In De Aar, between 1940 and 2025, the highest apparent temperature reached 40.2 °C on 6 January 1993, and the lowest was -12.4 °C on 5 August 1943.
Compare De Aar with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around De Aar