Delmas climate — normals and trends
Delmas (South Africa) has a subtropical highland, dry winter climate (Cwb) under the Köppen-Geiger classification. Its mean annual temperature is 15.6 °C and it receives 799 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 (19.5 °C on average) and the coldest is June (9.2 °C). Rainfall peaks in December.
Delmas averages 6 frost days, 10 hot days (≥ 30 °C) and 110 rainy days per year.
Delmas has warmed by +1.6 °C between 1940 and 2025, or +0.19 °C per decade. This trend is statistically significant.
The number of frost days there went from about 8 to 4 per year over the period.
The hottest day of the period reached 36.0 °C (on 6 January 2016) and the coldest -4.7 °C (on 21 July 2000).
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
DelmasMpumalanga
- coords
- -26.15°, 28.68°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.6°C
Average daily high
22.5°C
Average daily low
10.2°C
Annual rainfall
799mm
Sunshine / day
10.5h
Mean relative humidity
64%
Average peak wind
17.2km/h
Seasonal range
10.3°C
Frost days (< 0 °C)
6 d/yr
Hot days (≥ 30 °C)
10 d/yr
Rainy days (≥ 1 mm)
110 d/yr
Annual snowfall
0.4 cm
Average feels-like high
21.5 °C
Average feels-like low
8.1 °C
Average peak gust
35.0 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
19.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.41 · 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
36.0 °C
6 January 2016
Coldest day
-4.7 °C
21 July 2000
Wettest day
96 mm
23 January 1980
Windiest day
46.6 km/h
23 September 1941
Strongest gust
87.1 km/h
9 November 1940
Hottest feels-like
36.8 °C
6 January 2016
Coldest feels-like
-9.0 °C
28 June 1964
Snowiest day
11.8 cm
10 September 1981
Sunniest day
13.6 h
16 December 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 | 26.0 °C | +0.9 °C | 240 mm | +105 mm |
| Feb | 25.1 °C | +0.3 °C | 259 mm | +146 mm |
| Mar | 24.1 °C | +0.1 °C | 153 mm | +67 mm |
| Apr | 20.8 °C | -1.1 °C | 99 mm | +48 mm |
| May | 20.3 °C | +0.4 °C | 7 mm | -10 mm |
| Jun | 18.2 °C | +0.8 °C | 1 mm | -7 mm |
| Jul | 18.2 °C | +0.6 °C | 4 mm | +0 mm |
| Aug | 22.3 °C | +1.8 °C | 31 mm | +21 mm |
| Sep | 25.1 °C | +1.0 °C | 59 mm | +33 mm |
| Oct | 24.8 °C | -0.2 °C | 80 mm | -4 mm |
| Nov | 22.2 °C | -2.4 °C | 212 mm | +90 mm |
| Dec | 24.0 °C | -0.9 °C | 126 mm | -16 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 Delmas?
Delmas has a subtropical highland, dry winter climate (Köppen Cwb). Over 1940-2025, the average annual temperature is 15.6 °C and it receives 799 mm of precipitation per year.
What is the hottest day ever recorded in Delmas?
The hottest day measured in Delmas between 1940 and 2025 was 6 January 2016, reaching 36.0 °C.
What is the coldest day in Delmas?
The coldest day measured in Delmas between 1940 and 2025 was 21 July 2000, at -4.7 °C.
Does it snow in Delmas?
Almost never: Delmas sees virtually no snow, with about 6 frost days per year.
Has the climate of Delmas warmed?
Yes: Delmas warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Delmas?
The wettest day measured in Delmas between 1940 and 2025 was 23 January 1980, with 96 mm of rain in 24 hours.
What was the windiest day in Delmas?
The windiest day measured in Delmas between 1940 and 2025 was 23 September 1941, with winds reaching 46.6 km/h.
What is the warmest month in Delmas?
The warmest month in Delmas is January (19.5 °C on average); the coldest is June (9.2 °C).
How much does it rain in Delmas?
Delmas receives on average 799 mm of precipitation per year, spread over about 110 rainy days.
Is it sunny in Delmas?
Delmas gets on average 10.5 hours of sunshine per day, roughly 3,833 hours per year over 1940-2025.
What is the biggest single-day snowfall in Delmas?
The heaviest 24-hour snowfall measured in Delmas between 1940 and 2025 was 10 September 1981, with 11.8 cm.
Are there tropical nights in Delmas?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Delmas.
What was the most extreme apparent temperature in Delmas?
In Delmas, between 1940 and 2025, the highest apparent temperature reached 36.8 °C on 6 January 2016, and the lowest was -9.0 °C on 28 June 1964.
Compare Delmas with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Delmas