Postmasburg climate — normals and trends
Postmasburg (South Africa) has a cold semi-arid climate (BSk) under the Köppen-Geiger classification. Its mean annual temperature is 17.6 °C and it receives 391 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 (24.2 °C on average) and the coldest is July (9.6 °C). Rainfall peaks in February.
Postmasburg averages 14 frost days, 92 hot days (≥ 30 °C) and 63 rainy days per year.
Postmasburg has warmed by +0.6 °C between 1940 and 2025, or +0.07 °C per decade. This trend is statistically significant.
The number of frost days there went from about 11 to 17 per year over the period.
The hottest day of the period reached 40.7 °C (on 5 January 2016) and the coldest -6.2 °C (on 1 August 1974).
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
PostmasburgNorthern Cape
- coords
- -28.33°, 23.07°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
17.6°C
Average daily high
25.4°C
Average daily low
11.0°C
Annual rainfall
391mm
Sunshine / day
11.3h
Mean relative humidity
46%
Average peak wind
19.4km/h
Seasonal range
14.6°C
Frost days (< 0 °C)
14 d/yr
Hot days (≥ 30 °C)
92 d/yr
Rainy days (≥ 1 mm)
63 d/yr
Annual snowfall
0.1 cm
Average feels-like high
23.3 °C
Average feels-like low
8.1 °C
Average peak gust
40.3 km/h
Tropical nights (≥ 20 °C)
13 d/yr
Solar radiation
21.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.6 °C
since 1940
+0.1 °C per decade · r² = 0.05 · p = 0.033
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
40.7 °C
5 January 2016
Coldest day
-6.2 °C
1 August 1974
Wettest day
80 mm
6 February 1955
Windiest day
49.9 km/h
11 August 1957
Strongest gust
98.3 km/h
19 September 2013
Hottest feels-like
39.9 °C
5 January 2016
Coldest feels-like
-10.8 °C
17 July 1996
Snowiest day
2.1 cm
28 June 1994
Sunniest day
13.5 h
10 December 1944
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 34.2 °C | +3.1 °C | 32 mm | -36 mm |
| Feb | 32.4 °C | +2.5 °C | 20 mm | -52 mm |
| Mar | 28.3 °C | +0.2 °C | 70 mm | +11 mm |
| Apr | 24.2 °C | -0.4 °C | 80 mm | +44 mm |
| May | 21.7 °C | +0.4 °C | 1 mm | -13 mm |
| Jun | 19.0 °C | +0.9 °C | 13 mm | +4 mm |
| Jul | 19.6 °C | +1.3 °C | 4 mm | -1 mm |
| Aug | 22.7 °C | +1.9 °C | 18 mm | +14 mm |
| Sep | 27.6 °C | +2.8 °C | 16 mm | +6 mm |
| Oct | 28.8 °C | +1.3 °C | 21 mm | -2 mm |
| Nov | 29.7 °C | +0.5 °C | 61 mm | +21 mm |
| Dec | 31.2 °C | +0.4 °C | 68 mm | +17 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 Postmasburg?
Postmasburg has a cold semi-arid climate (Köppen BSk). Over 1940-2025, the average annual temperature is 17.6 °C and it receives 391 mm of precipitation per year.
What is the hottest day ever recorded in Postmasburg?
The hottest day measured in Postmasburg between 1940 and 2025 was 5 January 2016, reaching 40.7 °C.
What is the coldest day in Postmasburg?
The coldest day measured in Postmasburg between 1940 and 2025 was 1 August 1974, at -6.2 °C.
Does it snow in Postmasburg?
Almost never: Postmasburg sees virtually no snow, with about 14 frost days per year.
Has the climate of Postmasburg warmed?
Yes: Postmasburg warmed by +0.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Postmasburg?
The wettest day measured in Postmasburg between 1940 and 2025 was 6 February 1955, with 80 mm of rain in 24 hours.
What was the windiest day in Postmasburg?
The windiest day measured in Postmasburg between 1940 and 2025 was 11 August 1957, with winds reaching 49.9 km/h.
What is the warmest month in Postmasburg?
The warmest month in Postmasburg is January (24.2 °C on average); the coldest is July (9.6 °C).
How much does it rain in Postmasburg?
Postmasburg receives on average 391 mm of precipitation per year, spread over about 63 rainy days.
Is it sunny in Postmasburg?
Postmasburg gets on average 11.3 hours of sunshine per day, roughly 4,125 hours per year over 1940-2025.
What is the biggest single-day snowfall in Postmasburg?
The heaviest 24-hour snowfall measured in Postmasburg between 1940 and 2025 was 28 June 1994, with 2.1 cm.
Are there tropical nights in Postmasburg?
Yes: Postmasburg has on average 13 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Postmasburg?
In Postmasburg, between 1940 and 2025, the highest apparent temperature reached 39.9 °C on 5 January 2016, and the lowest was -10.8 °C on 17 July 1996.
Compare Postmasburg with another city
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Nearby cities
The climate around Postmasburg