Climate and average weather in Stilfontein
In Stilfontein, the summers are hot, wet, and partly cloudy and the winters are mild and clear.
Over the course of the year, the temperature in Stilfontein typically varies from 3°C to 29°C, and is rarely below -1°C or above 34°C. December is the hottest month of the year, while June is the coldest.
Based on the travel score, the best time of year to visit Stilfontein for warm-weather activities is from early April to early October.
- Hottest
- Dec
- 29°
- Coldest
- Jun
- 3°
- Wettest
- Dec
- 103 mm
- Driest
- Jul
- 4 mm
- Rain / yr
- 581 mm
- 91 wet days
- Daylight
- 10.3–13.7 h
- shortest–longest
- Elevation
- 1,357 m
- 26.8°S
- Clearest
- Jul
- 12% cloud
Stilfontein is town in the North West Province of South Africa.
- Founded
- 1949
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Stilfontein weather by month, at a glance
The whole year in one picture — sky, rain, humidity, temperature and travel score. Click any band to jump to its full chart.
Each stripe is one measure across the whole year, stacked so a single day reads top to bottom. The sky band runs overcast grey on top down to clear blue at the base — more blue means sunnier — followed by the rainfall curve, the humidity band, a temperature strip that tints each stretch of the year by how warm its average high is, and the travel-score line at the foot. Scan straight down any date to read that day across every measure at once; the score climbs highest around early April to early October.
Temperature through the year
Daily average highs and lows in Stilfontein, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
The hot season lasts 6.1 months, from September 16 to March 20, with daily high temperatures above 27°C. The hottest month of the year in Stilfontein is December, with an average high of 29°C and low of 17°C.
The cool season lasts 2.2 months, from May 28 to August 3, with daily high temperatures below 21°C. The coldest month of the year in Stilfontein is June, with an average low of 3°C and high of 20°C.
Days typically run about 14°C warmer than nights, with the widest day–night swing (around 16°C) in July.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 28 | 27 | 25 | 22 | 20 | 20 | 23 | 26 | 28 | 29 | 29 |
| Avg low (°C) | 18 | 17 | 15 | 12 | 7 | 3 | 3 | 6 | 11 | 14 | 15 | 17 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 29 | 18 |
| Feb | 28 | 17 |
| Mar | 27 | 15 |
| Apr | 25 | 12 |
| May | 22 | 7 |
| Jun | 20 | 3 |
| Jul | 20 | 3 |
| Aug | 23 | 6 |
| Sep | 26 | 11 |
| Oct | 28 | 14 |
| Nov | 29 | 15 |
| Dec | 29 | 17 |
How hot and cold Stilfontein really feels
The felt-temperature range through the year — heat index on the day's high (summer humidity), wind chill on the night's low (winter wind). The dashed lines are the plain thermometer; the gap is how much hotter or colder it really feels.
On the coldest nights, wind chill pulls the feels-like down to about -0°C (around July 11), with roughly 10 freezing days a year (feels-like at or below 0°C), worst in July.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°C) | 29 | 28 | 27 | 25 | 22 | 20 | 20 | 22 | 26 | 28 | 29 | 29 |
| Air high (°C) | 29 | 28 | 27 | 25 | 22 | 20 | 20 | 23 | 26 | 28 | 29 | 29 |
| Feels-like low (°C) | 18 | 17 | 15 | 11 | 5 | 1 | 0 | 4 | 10 | 14 | 15 | 17 |
| Air low (°C) | 18 | 17 | 15 | 12 | 7 | 3 | 3 | 6 | 11 | 14 | 15 | 17 |
| Feels-like high (°C) | Air high (°C) | Feels-like low (°C) | Air low (°C) | |
|---|---|---|---|---|
| Jan | 29 | 29 | 18 | 18 |
| Feb | 28 | 28 | 17 | 17 |
| Mar | 27 | 27 | 15 | 15 |
| Apr | 25 | 25 | 11 | 12 |
| May | 22 | 22 | 5 | 7 |
| Jun | 20 | 20 | 1 | 3 |
| Jul | 20 | 20 | 0 | 3 |
| Aug | 22 | 23 | 4 | 6 |
| Sep | 26 | 26 | 10 | 11 |
| Oct | 28 | 28 | 14 | 14 |
| Nov | 29 | 29 | 15 | 15 |
| Dec | 29 | 29 | 17 | 17 |
Average hourly temperature in Stilfontein
A compact picture of the whole year, hour by hour: each column is a day, each row an hour, and the color is the modeled average temperature. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
Read left to right for the day of the year and top to bottom for the hour of the day; the color is the modeled temperature, cool blues through to hot reds on the same scale as the other charts. A vertical slice is a single day's swing — coolest just before dawn, warmest in the mid-afternoon — while a horizontal slice follows one hour across the seasons. The darker overlay marks night and the lighter one the twilight around sunrise and sunset. Colors run warmest on December afternoons, near 29°C, and coldest before dawn in June, near 3°C.
Stilfontein weather by month
Every month at a glance. Click a month for its detailed page.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 29° / 18° | 101 | 14.7 | 13.5 | 5.1 |
| Feb | 28° / 17° | 83 | 12.5 | 12.9 | 5.7 |
| Mar | 27° / 15° | 70 | 11.1 | 12.2 | 6.6 |
| Apr | 25° / 12° | 38 | 6.5 | 11.4 | 7.9 |
| May | 22° / 7° | 18 | 2.7 | 10.7 | 8.6 |
| Jun | 20° / 3° | 8 | 1.5 | 10.3 | 8.3 |
| Jul | 20° / 3° | 4 | 0.8 | 10.5 | 8.5 |
| Aug | 23° / 6° | 10 | 1.5 | 11.1 | 9.0 |
| Sep | 26° / 11° | 14 | 2.7 | 11.8 | 8.4 |
| Oct | 28° / 14° | 59 | 9 | 12.6 | 6.6 |
| Nov | 29° / 15° | 73 | 11.9 | 13.3 | 5.6 |
| Dec | 29° / 17° | 103 | 15.9 | 13.7 | 5.0 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Stilfontein gets about 581 mm of precipitation a year. On a typical day the chance of rain is some rain, but that rises and falls sharply with the seasons.
The wetter season lasts 5.9 months, from around Oct 10 to Apr 8, peaking in December at about 50% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Jul 11.
December is the wettest month by volume, with 103 mm over about 16 wet days; July is the driest, with 4 mm.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 48 | 44 | 36 | 22 | 9 | 5 | 3 | 5 | 10 | 28 | 41 | 50 |
| Rain days | 15 | 13 | 11 | 7 | 3 | 2 | 1 | 2 | 3 | 9 | 12 | 16 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 48 | 15 |
| Feb | 44 | 13 |
| Mar | 36 | 11 |
| Apr | 22 | 7 |
| May | 9 | 3 |
| Jun | 5 | 2 |
| Jul | 3 | 1 |
| Aug | 5 | 2 |
| Sep | 10 | 3 |
| Oct | 28 | 9 |
| Nov | 41 | 12 |
| Dec | 50 | 16 |
Monthly rainfall
Over a full year, Stilfontein collects about 581 mm of rain across 91 wet days — roughly 48 mm in an average month.
It doesn’t fall evenly. December is the wettest month with 103 mm, while July is the driest at just 4 mm. The three wettest months alone bring about 49% of the year’s total.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (mm) | 101 | 83 | 70 | 38 | 18 | 8 | 4 | 10 | 14 | 59 | 73 | 103 |
| Rain days | 15 | 13 | 11 | 7 | 3 | 2 | 1 | 2 | 3 | 9 | 12 | 16 |
| Rainfall (mm) | Rain days | |
|---|---|---|
| Jan | 101 | 15 |
| Feb | 83 | 13 |
| Mar | 70 | 11 |
| Apr | 38 | 7 |
| May | 18 | 3 |
| Jun | 8 | 2 |
| Jul | 4 | 1 |
| Aug | 10 | 2 |
| Sep | 14 | 3 |
| Oct | 59 | 9 |
| Nov | 73 | 12 |
| Dec | 103 | 16 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Stilfontein, the average share of the sky covered by clouds shows significant seasonal variation over the course of the year.
The clearer part of the year begins around April 19 and lasts for 5.7 months, ending around October 7. The clearest month is July, when the sky is clear, mostly clear, or partly cloudy 94% of the time on average.
The cloudier part of the year begins around October 8 and lasts for 6.3 months, ending around April 18. The cloudiest month is November, when it is overcast or mostly cloudy 33% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 69 | 72 | 75 | 79 | 87 | 91 | 94 | 92 | 87 | 76 | 67 | 67 |
| Cloudier (%) | 31 | 28 | 25 | 21 | 13 | 9 | 6 | 8 | 13 | 24 | 33 | 33 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 69 | 31 |
| Feb | 72 | 28 |
| Mar | 75 | 25 |
| Apr | 79 | 21 |
| May | 87 | 13 |
| Jun | 91 | 9 |
| Jul | 94 | 6 |
| Aug | 92 | 8 |
| Sep | 87 | 13 |
| Oct | 76 | 24 |
| Nov | 67 | 33 |
| Dec | 67 | 33 |
Daylight, sunrise and sunset
Hours of daylight through the year, with sunrise and sunset times.
The gold band is daylight — sunrise runs along its lower edge, sunset along the upper — so it widens toward summer and pinches toward winter, with night the dark area above and below. The longest day, around January 1, brings about 13 h 42 min of light; the shortest, around June 11, only 10 h 18 min — a swing of roughly 3 h 24 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 13.5 | 12.9 | 12.2 | 11.4 | 10.7 | 10.3 | 10.5 | 11.1 | 11.8 | 12.6 | 13.3 | 13.7 |
| Sunrise (AM) | 5:37 | 5:59 | 6:17 | 6:32 | 6:49 | 7:04 | 7:05 | 6:46 | 6:12 | 5:39 | 5:18 | 5:19 |
| Sunset (PM) | 7:08 | 6:56 | 6:28 | 5:54 | 5:30 | 5:23 | 5:32 | 5:48 | 6:03 | 6:17 | 6:39 | 6:59 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 13.5 | 5:37 | 7:08 |
| Feb | 12.9 | 5:59 | 6:56 |
| Mar | 12.2 | 6:17 | 6:28 |
| Apr | 11.4 | 6:32 | 5:54 |
| May | 10.7 | 6:49 | 5:30 |
| Jun | 10.3 | 7:04 | 5:23 |
| Jul | 10.5 | 7:05 | 5:32 |
| Aug | 11.1 | 6:46 | 5:48 |
| Sep | 11.8 | 6:12 | 6:03 |
| Oct | 12.6 | 5:39 | 6:17 |
| Nov | 13.3 | 5:18 | 6:39 |
| Dec | 13.7 | 5:19 | 6:59 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Stilfontein averages about 19 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 12 and 27 days.
The sunnier stretch runs 5.6 months, from around Apr 16 to Oct 2. The sunniest month is July, with roughly 27 sunny days (brilliant).
The greyest month is December, down near 12 sunny days — about 54% fewer than the July peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 13 | 13 | 16 | 18 | 23 | 25 | 27 | 26 | 22 | 17 | 13 | 13 |
| Sky | Mixed | Mixed | Bright | Bright | Bright | Brilliant | Brilliant | Brilliant | Bright | Bright | Mixed | Mixed |
| Sunny days | Sky | |
|---|---|---|
| Jan | 13 | Mixed |
| Feb | 13 | Mixed |
| Mar | 16 | Bright |
| Apr | 18 | Bright |
| May | 23 | Bright |
| Jun | 25 | Brilliant |
| Jul | 27 | Brilliant |
| Aug | 26 | Brilliant |
| Sep | 22 | Bright |
| Oct | 17 | Bright |
| Nov | 13 | Mixed |
| Dec | 13 | Mixed |
Humidity comfort
Share of days at each humidity comfort level, based on the dew point — the measure that tracks how muggy it actually feels.
Humidity comfort is graded by the dew point — the temperature at which the air would be fully saturated — because it tracks how muggy it actually feels far better than relative humidity does. A low dew point feels dry and crisp; a high one feels sticky and oppressive no matter the reading on a humidity gauge.
In Stilfontein, how humid it feels changes dramatically over the year.
The more humid part of the year lasts 3.5 months, from around December 11 to March 27. The muggiest month is January, when the air feels humid, muggy or worse about 36% of the time.
The most comfortable stretch runs from around March 28 to December 10, and April is the most comfortable month — the air is dry or comfortable 99% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 26 | 23 | 44 | 85 | 100 | 100 | 100 | 100 | 100 | 90 | 70 | 41 |
| Comfortable (%) | 38 | 41 | 40 | 14 | 0 | 0 | 0 | 0 | 0 | 10 | 27 | 44 |
| Humid (%) | 35 | 36 | 16 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 14 |
| Muggy (%) | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| Jan | 26 | 38 | 35 | 1 |
| Feb | 23 | 41 | 36 | 1 |
| Mar | 44 | 40 | 16 | 0 |
| Apr | 85 | 14 | 1 | 0 |
| May | 100 | 0 | 0 | 0 |
| Jun | 100 | 0 | 0 | 0 |
| Jul | 100 | 0 | 0 | 0 |
| Aug | 100 | 0 | 0 | 0 |
| Sep | 100 | 0 | 0 | 0 |
| Oct | 90 | 10 | 0 | 0 |
| Nov | 70 | 27 | 4 | 0 |
| Dec | 41 | 44 | 14 | 1 |
Wind
Average wind speed through the year, banded into plain-language speed zones so a number reads as 'breezy' or 'calm' without knowing the scale.
This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.
Across the year, average wind speed in Stilfontein is typically calm, near 11 km/h, and varies little with the seasons.
The windier part of the year lasts 5.2 months, from around Aug 2 to Jan 7. The windiest month is September, averaging about 13 km/h (light breeze).
The calmer part of the year runs from around Jan 8 to Aug 1, with May the calmest month at about 9 km/h.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 10 | 9 | 9 | 9 | 9 | 10 | 10 | 12 | 13 | 13 | 13 | 12 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | light breeze | light breeze | light breeze | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 10 | calm |
| Feb | 9 | calm |
| Mar | 9 | calm |
| Apr | 9 | calm |
| May | 9 | calm |
| Jun | 10 | calm |
| Jul | 10 | calm |
| Aug | 12 | calm |
| Sep | 13 | light breeze |
| Oct | 13 | light breeze |
| Nov | 13 | light breeze |
| Dec | 12 | calm |
Hazard calendar for Stilfontein
When the seasonal hazards worth planning around — the rainy season, tropical-cyclone risk and dust haze — are active through the year.
Stilfontein's rainy season runs October–March, when most of the year's rain falls.
Best time to visit Stilfontein
To characterize how pleasant the weather is in Stilfontein throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around mid April, Stilfontein is still near the start of its best-weather window — great conditions with the peak-season crowds not yet at full swing.
Inferred from the travel-score curve; month-by-month visitor numbers are a planned addition.
The travel score favors clear, rainless days with daytime highs between 18°C and 28°C. Based on this score, the best time of year to visit Stilfontein for general outdoor tourist activities is from early April to early October, with a peak score in the last week of August.
The travel score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Travel score (0–10) | 5.1 | 5.7 | 6.6 | 7.9 | 8.6 | 8.3 | 8.5 | 9.0 | 8.4 | 6.6 | 5.6 | 5.0 |
| Rating | fair | good | good | ideal | ideal | ideal | ideal | ideal | ideal | good | good | fair |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 5.1 | fair |
| Feb | 5.7 | good |
| Mar | 6.6 | good |
| Apr | 7.9 | ideal |
| May | 8.6 | ideal |
| Jun | 8.3 | ideal |
| Jul | 8.5 | ideal |
| Aug | 9.0 | ideal |
| Sep | 8.4 | ideal |
| Oct | 6.6 | good |
| Nov | 5.6 | good |
| Dec | 5.0 | fair |
The beach/pool score favors clear, rainless days with daytime highs between 24°C and 34°C. Based on this score, the best times of year to visit Stilfontein for hot-weather activities run from late February to mid May and again from mid August to late November, with a peak score in the third week of September.
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
What to pack for Stilfontein, by month
Month by month, what's worth putting in the bag — from the temperature range, rain chance, sun and wind. Tap a month for a quick packing note.
For a warm-season trip around December (highs near 29°C), the essentials are light clothes, rain gear and sun protection. In the cold season around June (highs near 20°C), pack a warm layer.
In December, Stilfontein sees daytime highs around 29°C and nights near 17°C. Pack light clothes, rain gear and sun protection. About 16 days see rain.
UV index (midday) in Stilfontein by month
Clear-sky midday UV index through the year, shaded by the WHO exposure levels — how much sun protection each month calls for.
Under clear skies, the midday UV index in Stilfontein peaks around January 13 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 at about 5 (high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 15 | 13 | 12 | 9 | 6 | 5 | 5 | 7 | 9 | 11 | 12 | 14 |
| Level | Extreme | Extreme | Extreme | Very high | High | Moderate | High | Very high | Very high | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 15 | Extreme |
| Feb | 13 | Extreme |
| Mar | 12 | Extreme |
| Apr | 9 | Very high |
| May | 6 | High |
| Jun | 5 | Moderate |
| Jul | 5 | High |
| Aug | 7 | Very high |
| Sep | 9 | Very high |
| Oct | 11 | Extreme |
| Nov | 12 | Extreme |
| Dec | 14 | Extreme |
Average hourly UV index in Stilfontein
Modeled clear-sky UV for every hour of every day — when in the day sun protection actually matters.
The whole year hour by hour: each column is a day, each row an hour, and the color is the modeled clear-sky UV index — the midday peak scaled down as the sun sits lower in the sky. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
UV falls off far faster than brightness as the sun drops, so even in January the burn window is concentrated in the middle of the day: about 9 hours a day reach index 3 (protection recommended), and 7 hours reach 6 or more. Mornings and late afternoons stay comparatively gentle year round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV ≥ 3 (h/day) | 9 | 8.5 | 8 | 7 | 5.5 | 4.5 | 5 | 6 | 7 | 8 | 8.5 | 9 |
| UV ≥ 6 (h/day) | 7 | 6.5 | 5.5 | 4 | 1.5 | 0 | 0 | 3 | 4.5 | 5.5 | 6.5 | 7 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 9 | 7 |
| Feb | 8.5 | 6.5 |
| Mar | 8 | 5.5 |
| Apr | 7 | 4 |
| May | 5.5 | 1.5 |
| Jun | 4.5 | 0 |
| Jul | 5 | 0 |
| Aug | 6 | 3 |
| Sep | 7 | 4.5 |
| Oct | 8 | 5.5 |
| Nov | 8.5 | 6.5 |
| Dec | 9 | 7 |
Air quality in Stilfontein by month
Average fine-particle pollution (PM2.5) through the year — so you can see which months the air is worst, not just the yearly average.
Air quality in Stilfontein is worst in June — around 57 µg/m³ PM2.5 (unhealthy), about 4.6× the cleanest month (December, 12 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 14 | 19 | 26 | 34 | 48 | 57 | 56 | 45 | 38 | 26 | 15 | 12 |
| Level | Moderate | Moderate | Moderate | Moderate | Poor | Unhealthy | Unhealthy | Poor | Poor | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 14 | Moderate |
| Feb | 19 | Moderate |
| Mar | 26 | Moderate |
| Apr | 34 | Moderate |
| May | 48 | Poor |
| Jun | 57 | Unhealthy |
| Jul | 56 | Unhealthy |
| Aug | 45 | Poor |
| Sep | 38 | Poor |
| Oct | 26 | Moderate |
| Nov | 15 | Moderate |
| Dec | 12 | Moderate |
Growing season
Stilfontein is mild enough that a frost-free day stays more likely than not even in midwinter. Nights are reliably above freezing from about July 28 to June 8 (316 days); outside that window a hard frost is an occasional risk.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 100 | 100 | 100 | 100 | 99 | 87 | 85 | 96 | 100 | 100 | 100 | 100 |
| Frost nights | 0 | 0 | 0 | 0 | 0 | 22 | 26 | 0 | 0 | 0 | 0 | 0 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 100 | 0 |
| Feb | 100 | 0 |
| Mar | 100 | 0 |
| Apr | 100 | 0 |
| May | 99 | 0 |
| Jun | 87 | 22 |
| Jul | 85 | 26 |
| Aug | 96 | 0 |
| Sep | 100 | 0 |
| Oct | 100 | 0 |
| Nov | 100 | 0 |
| Dec | 100 | 0 |
Growing degree days
Growing degree days tally heat above 10°C: each day adds however many degrees its average temperature runs over that threshold, and cold days add nothing. Stilfontein banks about 3,061 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around January.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°C·days) | 408 | 353 | 343 | 241 | 141 | 44 | 40 | 134 | 257 | 339 | 359 | 400 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 408 |
| Feb | 353 |
| Mar | 343 |
| Apr | 241 |
| May | 141 |
| Jun | 44 |
| Jul | 40 |
| Aug | 134 |
| Sep | 257 |
| Oct | 339 |
| Nov | 359 |
| Dec | 400 |
Solar energy
Average daily shortwave solar energy reaching the ground, banded into brightness zones so the number means something at a glance.
Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.
Stilfontein receives about 5.7 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 3.9 and 7.3 kWh/m².
The brighter stretch of the year lasts 6.4 months, from around Sep 3 to Mar 15. The brightest month is December, averaging about 7.2 kWh/m² (intense).
The dimmest month is June, down near 3.9 kWh/m² — roughly 46% less than the December peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 6.9 | 6.5 | 5.7 | 4.9 | 4.3 | 3.9 | 4.2 | 5.0 | 6.2 | 6.8 | 7.1 | 7.2 |
| Level | Intense | Intense | Bright | Bright | Bright | Moderate | Bright | Bright | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 6.9 | Intense |
| Feb | 6.5 | Intense |
| Mar | 5.7 | Bright |
| Apr | 4.9 | Bright |
| May | 4.3 | Bright |
| Jun | 3.9 | Moderate |
| Jul | 4.2 | Bright |
| Aug | 5.0 | Bright |
| Sep | 6.2 | Intense |
| Oct | 6.8 | Intense |
| Nov | 7.1 | Intense |
| Dec | 7.2 | Intense |
Where is Stilfontein?
Stilfontein sits at 26.8°S, 26.8°E, 1,357 m above sea level, in South Africa. The nearest listed city is Klerksdorp, 10 km away.
Topography around Stilfontein
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Stilfontein.
Within 3 km, the terrain around Stilfontein has only modest variations in elevation — a maximum elevation change of 67 m around an average of 1,353 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 211 m; within 80 km, significant variations in elevation — a maximum elevation change of 522 m.
The land around Stilfontein is covered by grassland (60%) within 3 km, grassland (75%) within 16 km, and grassland (62%) and cropland (32%) within 80 km.
South Africa travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / M / N
- 230 V · 50 Hz
- Prices
- ≈ 41% of US
- price level, 2025
- GDP per capita
- $6,598
- 2025
- Happiness
- 5.0 / 10
- World Happiness, 2025
- Safe drinking water
- 68%
- of population, 2024
- Homicide rate
- 43.7
- per 100k, 2022
- Road deaths
- 22.2
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Very high
- EF EPI 602
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Stilfontein (-26.8449°, 26.7683°, elevation 1,357 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).