Ashton climate — normals and trends
Ashton (South Africa) has a cold semi-arid climate (BSk) under the Köppen-Geiger classification. Its mean annual temperature is 15.3 °C and it receives 361 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 (20.6 °C on average) and the coldest is July (9.5 °C). Rainfall peaks in October.
Ashton averages 4 frost days, 40 hot days (≥ 30 °C) and 70 rainy days per year.
Ashton 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 6 to 2 per year over the period.
The hottest day of the period reached 41.8 °C (on 11 January 2018) and the coldest -4.7 °C (on 8 July 1981).
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
AshtonWestern Cape
- coords
- -33.83°, 20.06°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.3°C
Average daily high
22.2°C
Average daily low
9.9°C
Annual rainfall
361mm
Sunshine / day
10.8h
Mean relative humidity
66%
Average peak wind
15.2km/h
Seasonal range
11.1°C
Frost days (< 0 °C)
4 d/yr
Hot days (≥ 30 °C)
40 d/yr
Rainy days (≥ 1 mm)
70 d/yr
Annual snowfall
0.8 cm
Average feels-like high
21.0 °C
Average feels-like low
8.4 °C
Average peak gust
40.6 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
19.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.68 · 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
41.8 °C
11 January 2018
Coldest day
-4.7 °C
8 July 1981
Wettest day
86 mm
24 March 2003
Windiest day
42.2 km/h
2 December 1943
Strongest gust
113.0 km/h
7 June 2017
Hottest feels-like
41.9 °C
2 February 1990
Coldest feels-like
-8.1 °C
8 July 1981
Snowiest day
4.2 cm
25 July 1952
Sunniest day
14.2 h
15 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 | 29.4 °C | +1.2 °C | 12 mm | -13 mm |
| Feb | 28.8 °C | +1.1 °C | 7 mm | -22 mm |
| Mar | 27.6 °C | +1.6 °C | 35 mm | +2 mm |
| Apr | 23.3 °C | +0.6 °C | 53 mm | +19 mm |
| May | 21.1 °C | +1.6 °C | 21 mm | -10 mm |
| Jun | 16.6 °C | -0.1 °C | 41 mm | +9 mm |
| Jul | 15.8 °C | -0.2 °C | 23 mm | -8 mm |
| Aug | 18.1 °C | +1.2 °C | 9 mm | -25 mm |
| Sep | 22.4 °C | +3.1 °C | 9 mm | -16 mm |
| Oct | 24.5 °C | +2.5 °C | 10 mm | -25 mm |
| Nov | 27.7 °C | +3.1 °C | 13 mm | -17 mm |
| Dec | 29.0 °C | +2.2 °C | 13 mm | -10 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 Ashton?
Ashton has a cold semi-arid climate (Köppen BSk). Over 1940-2025, the average annual temperature is 15.3 °C and it receives 361 mm of precipitation per year.
What is the hottest day ever recorded in Ashton?
The hottest day measured in Ashton between 1940 and 2025 was 11 January 2018, reaching 41.8 °C.
What is the coldest day in Ashton?
The coldest day measured in Ashton between 1940 and 2025 was 8 July 1981, at -4.7 °C.
Does it snow in Ashton?
Almost never: Ashton sees virtually no snow, with about 4 frost days per year.
Has the climate of Ashton warmed?
Yes: Ashton warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ashton?
The wettest day measured in Ashton between 1940 and 2025 was 24 March 2003, with 86 mm of rain in 24 hours.
What was the windiest day in Ashton?
The windiest day measured in Ashton between 1940 and 2025 was 2 December 1943, with winds reaching 42.2 km/h.
What is the warmest month in Ashton?
The warmest month in Ashton is January (20.6 °C on average); the coldest is July (9.5 °C).
How much does it rain in Ashton?
Ashton receives on average 361 mm of precipitation per year, spread over about 70 rainy days.
Is it sunny in Ashton?
Ashton gets on average 10.8 hours of sunshine per day, roughly 3,942 hours per year over 1940-2025.
What is the biggest single-day snowfall in Ashton?
The heaviest 24-hour snowfall measured in Ashton between 1940 and 2025 was 25 July 1952, with 4.2 cm.
Are there tropical nights in Ashton?
Yes: Ashton has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Ashton?
In Ashton, between 1940 and 2025, the highest apparent temperature reached 41.9 °C on 2 February 1990, and the lowest was -8.1 °C on 8 July 1981.
Compare Ashton with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ashton