Climate and average weather in Ballajura
In Ballajura, the summers are hot, dry, and clear and the winters are mild and mostly clear.
Over the course of the year, the temperature in Ballajura typically varies from 9°C to 32°C, and is rarely below 5°C or above 38°C. January is the hottest month of the year, while July is the coldest.
Based on the travel score, the best times of year to visit Ballajura for warm-weather activities are from mid March to early June and mid September to mid December.
- Hottest
- Jan
- 32°
- Coldest
- Jul
- 9°
- Wettest
- Jul
- 83 mm
- Driest
- Dec
- 11 mm
- Rain / yr
- 468 mm
- 66 wet days
- Daylight
- 9.9–14.1 h
- shortest–longest
- Elevation
- 40 m
- 31.8°S
- Clearest
- Jan
- 22% cloud
Ballajura is suburb of Perth, Western Australia.
- Density
- 2,074/km²
- people per km²
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Ballajura 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 mid September to mid December.
Temperature through the year
Daily average highs and lows in Ballajura, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
The hot season lasts 3.5 months, from December 7 to March 23, with daily high temperatures above 28°C. The hottest month of the year in Ballajura is January, with an average high of 32°C and low of 18°C.
The cool season lasts 4.0 months, from May 27 to September 24, with daily high temperatures below 20°C. The coldest month of the year in Ballajura is July, with an average low of 9°C and high of 17°C.
Days typically run about 11°C warmer than nights, with the widest day–night swing (around 13°C) in January.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 32 | 32 | 29 | 25 | 21 | 18 | 17 | 18 | 19 | 23 | 26 | 30 |
| Avg low (°C) | 18 | 19 | 17 | 15 | 11 | 9 | 9 | 9 | 9 | 11 | 14 | 17 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 32 | 18 |
| Feb | 32 | 19 |
| Mar | 29 | 17 |
| Apr | 25 | 15 |
| May | 21 | 11 |
| Jun | 18 | 9 |
| Jul | 17 | 9 |
| Aug | 18 | 9 |
| Sep | 19 | 9 |
| Oct | 23 | 11 |
| Nov | 26 | 14 |
| Dec | 30 | 17 |
Average hourly temperature in Ballajura
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 January afternoons, near 32°C, and coldest before dawn in July, near 9°C.
Ballajura 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 | 32° / 18° | 20 | 2.3 | 13.8 | 5.4 |
| Feb | 32° / 19° | 17 | 1.8 | 13.2 | 5.4 |
| Mar | 29° / 17° | 19 | 2.8 | 12.2 | 6.7 |
| Apr | 25° / 15° | 24 | 3.9 | 11.2 | 8.0 |
| May | 21° / 11° | 54 | 6.9 | 10.4 | 7.2 |
| Jun | 18° / 9° | 73 | 9.4 | 10 | 6.2 |
| Jul | 17° / 9° | 83 | 10.9 | 10.1 | 5.6 |
| Aug | 18° / 9° | 73 | 10.2 | 10.8 | 5.9 |
| Sep | 19° / 9° | 49 | 8 | 11.8 | 6.6 |
| Oct | 23° / 11° | 26 | 4.6 | 12.8 | 7.9 |
| Nov | 26° / 14° | 19 | 3.7 | 13.6 | 8.0 |
| Dec | 30° / 17° | 11 | 1.9 | 14 | 6.8 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Ballajura gets about 468 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 5.0 months, from around May 6 to Oct 3, peaking in July at about 36% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Dec 30.
July is the wettest month by volume, with 83 mm over about 11 wet days; December is the driest, with 11 mm.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 7 | 7 | 10 | 13 | 22 | 31 | 35 | 33 | 26 | 16 | 12 | 7 |
| Rain days | 2 | 2 | 3 | 4 | 7 | 9 | 11 | 10 | 8 | 5 | 4 | 2 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 7 | 2 |
| Feb | 7 | 2 |
| Mar | 10 | 3 |
| Apr | 13 | 4 |
| May | 22 | 7 |
| Jun | 31 | 9 |
| Jul | 35 | 11 |
| Aug | 33 | 10 |
| Sep | 26 | 8 |
| Oct | 16 | 5 |
| Nov | 12 | 4 |
| Dec | 7 | 2 |
Monthly rainfall
Over a full year, Ballajura collects about 468 mm of rain across 66 wet days — roughly 39 mm in an average month.
It doesn’t fall evenly. July is the wettest month with 83 mm, while December is the driest at just 11 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) | 20 | 17 | 19 | 24 | 54 | 73 | 83 | 73 | 49 | 26 | 19 | 11 |
| Rain days | 2 | 2 | 3 | 4 | 7 | 9 | 11 | 10 | 8 | 5 | 4 | 2 |
| Rainfall (mm) | Rain days | |
|---|---|---|
| Jan | 20 | 2 |
| Feb | 17 | 2 |
| Mar | 19 | 3 |
| Apr | 24 | 4 |
| May | 54 | 7 |
| Jun | 73 | 9 |
| Jul | 83 | 11 |
| Aug | 73 | 10 |
| Sep | 49 | 8 |
| Oct | 26 | 5 |
| Nov | 19 | 4 |
| Dec | 11 | 2 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Ballajura, the average share of the sky covered by clouds shows moderate seasonal variation over the course of the year.
The clearer part of the year begins around October 26 and lasts for 5.2 months, ending around March 31. The clearest month is January, when the sky is clear, mostly clear, or partly cloudy 86% of the time on average.
The cloudier part of the year begins around April 1 and lasts for 6.8 months, ending around October 25. The cloudiest month is August, when it is overcast or mostly cloudy 39% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 86 | 83 | 76 | 69 | 64 | 61 | 61 | 61 | 61 | 68 | 74 | 82 |
| Cloudier (%) | 14 | 17 | 24 | 31 | 36 | 39 | 39 | 39 | 39 | 32 | 26 | 18 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 86 | 14 |
| Feb | 83 | 17 |
| Mar | 76 | 24 |
| Apr | 69 | 31 |
| May | 64 | 36 |
| Jun | 61 | 39 |
| Jul | 61 | 39 |
| Aug | 61 | 39 |
| Sep | 61 | 39 |
| Oct | 68 | 32 |
| Nov | 74 | 26 |
| Dec | 82 | 18 |
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 December 13, brings about 14 h 06 min of light; the shortest, around June 13, only 9 h 54 min — a swing of roughly 4 h 12 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 13.8 | 13.2 | 12.2 | 11.2 | 10.4 | 10.0 | 10.1 | 10.8 | 11.8 | 12.8 | 13.6 | 14.0 |
| Sunrise (AM) | 5:30 | 5:56 | 6:19 | 6:40 | 7:01 | 7:19 | 7:19 | 6:56 | 6:16 | 5:38 | 5:12 | 5:10 |
| Sunset (PM) | 7:22 | 7:06 | 6:33 | 5:53 | 5:24 | 5:15 | 5:25 | 5:45 | 6:05 | 6:25 | 6:51 | 7:15 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 13.8 | 5:30 | 7:22 |
| Feb | 13.2 | 5:56 | 7:06 |
| Mar | 12.2 | 6:19 | 6:33 |
| Apr | 11.2 | 6:40 | 5:53 |
| May | 10.4 | 7:01 | 5:24 |
| Jun | 10.0 | 7:19 | 5:15 |
| Jul | 10.1 | 7:19 | 5:25 |
| Aug | 10.8 | 6:56 | 5:45 |
| Sep | 11.8 | 6:16 | 6:05 |
| Oct | 12.8 | 5:38 | 6:25 |
| Nov | 13.6 | 5:12 | 6:51 |
| Dec | 14.0 | 5:10 | 7:15 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Ballajura averages about 16 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 9 and 23 days.
The sunnier stretch runs 5.6 months, from around Oct 24 to Apr 11. The sunniest month is January, with roughly 23 sunny days (brilliant).
The greyest month is August, down near 10 sunny days — about 58% fewer than the January peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 24 | 21 | 20 | 15 | 13 | 11 | 11 | 10 | 11 | 15 | 17 | 22 |
| Sky | Brilliant | Bright | Bright | Bright | Mixed | Mixed | Mixed | Mixed | Mixed | Mixed | Bright | Bright |
| Sunny days | Sky | |
|---|---|---|
| Jan | 24 | Brilliant |
| Feb | 21 | Bright |
| Mar | 20 | Bright |
| Apr | 15 | Bright |
| May | 13 | Mixed |
| Jun | 11 | Mixed |
| Jul | 11 | Mixed |
| Aug | 10 | Mixed |
| Sep | 11 | Mixed |
| Oct | 15 | Mixed |
| Nov | 17 | Bright |
| Dec | 22 | Bright |
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 Ballajura, how humid it feels changes noticeably over the year.
The more humid part of the year lasts 4.3 months, from around December 13 to April 23. The muggiest month is February, when the air feels humid, muggy or worse about 24% of the time.
The most comfortable stretch runs from around April 24 to December 12, and June is the most comfortable month — the air is dry or comfortable 100% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 53 | 48 | 56 | 64 | 80 | 93 | 97 | 95 | 95 | 88 | 78 | 68 |
| Comfortable (%) | 29 | 28 | 24 | 26 | 18 | 7 | 3 | 4 | 5 | 12 | 19 | 24 |
| Humid (%) | 14 | 19 | 15 | 8 | 2 | 0 | 0 | 0 | 0 | 1 | 3 | 7 |
| Muggy (%) | 4 | 4 | 4 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| Jan | 53 | 29 | 14 | 4 |
| Feb | 48 | 28 | 19 | 4 |
| Mar | 56 | 24 | 15 | 4 |
| Apr | 64 | 26 | 8 | 1 |
| May | 80 | 18 | 2 | 0 |
| Jun | 93 | 7 | 0 | 0 |
| Jul | 97 | 3 | 0 | 0 |
| Aug | 95 | 4 | 0 | 0 |
| Sep | 95 | 5 | 0 | 0 |
| Oct | 88 | 12 | 1 | 0 |
| Nov | 78 | 19 | 3 | 0 |
| Dec | 68 | 24 | 7 | 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 Ballajura is typically light breeze, near 14 km/h, and varies little with the seasons.
The windier part of the year lasts 5.4 months, from around Oct 16 to Mar 29. The windiest month is January, averaging about 16 km/h (light breeze).
The calmer part of the year runs from around Mar 30 to Oct 15, with April the calmest month at about 13 km/h.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 16 | 16 | 15 | 13 | 12 | 13 | 13 | 13 | 13 | 14 | 15 | 16 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 16 | light breeze |
| Feb | 16 | light breeze |
| Mar | 15 | light breeze |
| Apr | 13 | light breeze |
| May | 12 | light breeze |
| Jun | 13 | light breeze |
| Jul | 13 | light breeze |
| Aug | 13 | light breeze |
| Sep | 13 | light breeze |
| Oct | 14 | light breeze |
| Nov | 15 | light breeze |
| Dec | 16 | light breeze |
Hazard calendar for Ballajura
When the seasonal hazards worth planning around — the rainy season, tropical-cyclone risk and dust haze — are active through the year.
Ballajura sits in the South Indian Ocean cyclone belt; the season peaks January–March.
Best time to visit Ballajura
To characterize how pleasant the weather is in Ballajura throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around early December, Ballajura is still near the tail of its best-weather window — great conditions with the peak-season crowds already thinning.
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 times of year to visit Ballajura for general outdoor tourist activities run from mid March to early June and again from mid September to mid December, with a peak score in the last week of October.
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) | 5.4 | 5.4 | 6.7 | 8.0 | 7.2 | 6.2 | 5.6 | 5.9 | 6.7 | 7.9 | 8.0 | 6.7 |
| Rating | fair | fair | good | ideal | good | good | good | good | good | ideal | ideal | good |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 5.4 | fair |
| Feb | 5.4 | fair |
| Mar | 6.7 | good |
| Apr | 8.0 | ideal |
| May | 7.2 | good |
| Jun | 6.2 | good |
| Jul | 5.6 | good |
| Aug | 5.9 | good |
| Sep | 6.7 | good |
| Oct | 7.9 | ideal |
| Nov | 8.0 | ideal |
| Dec | 6.7 | good |
The beach/pool score favors clear, rainless days with daytime highs between 24°C and 34°C. Based on this score, the best time of year to visit Ballajura for hot-weather activities is from late October to late April, with a peak score in the third week of December.
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 Ballajura, 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 January (highs near 32°C), the essentials are light clothes and sun protection. In the cold season around July (highs near 17°C), pack rain gear.
In January, Ballajura sees daytime highs around 32°C and nights near 18°C. Pack light clothes and sun protection.
Sea temperature near Ballajura
Average ocean temperature at the nearest coast, month by month, banded into swim-comfort zones — the other half of the beach question.
The sea at the nearest coast (about 26 km away) is warmest in February at about 22°C and coldest in September near 19°C.
It's comfortable for a long swim from Nov 22 to Jul 12 — about 7.7 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 22 | 22 | 22 | 22 | 22 | 21 | 20 | 19 | 19 | 19 | 20 | 21 |
| Comfort | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Cool | Cool | Cool | Cool | Cool | Refreshing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 22 | Refreshing |
| Feb | 22 | Refreshing |
| Mar | 22 | Refreshing |
| Apr | 22 | Refreshing |
| May | 22 | Refreshing |
| Jun | 21 | Refreshing |
| Jul | 20 | Cool |
| Aug | 19 | Cool |
| Sep | 19 | Cool |
| Oct | 19 | Cool |
| Nov | 20 | Cool |
| Dec | 21 | Refreshing |
UV index (midday) in Ballajura 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 Ballajura peaks around December 23 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 3 (moderate).
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) | 13 | 12 | 11 | 6 | 4 | 3 | 3 | 5 | 8 | 9 | 10 | 13 |
| Level | Extreme | Extreme | Extreme | High | Moderate | Moderate | Moderate | Moderate | Very high | Very high | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 13 | Extreme |
| Feb | 12 | Extreme |
| Mar | 11 | Extreme |
| Apr | 6 | High |
| May | 4 | Moderate |
| Jun | 3 | Moderate |
| Jul | 3 | Moderate |
| Aug | 5 | Moderate |
| Sep | 8 | Very high |
| Oct | 9 | Very high |
| Nov | 10 | Extreme |
| Dec | 13 | Extreme |
Average hourly UV index in Ballajura
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 December 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 | 7.5 | 6 | 4 | 2 | 2.5 | 4.5 | 6.5 | 7.5 | 8.5 | 9 |
| UV ≥ 6 (h/day) | 7 | 6.5 | 5.5 | 2 | 0 | 0 | 0 | 0 | 3.5 | 5 | 6 | 7 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 9 | 7 |
| Feb | 8.5 | 6.5 |
| Mar | 7.5 | 5.5 |
| Apr | 6 | 2 |
| May | 4 | 0 |
| Jun | 2 | 0 |
| Jul | 2.5 | 0 |
| Aug | 4.5 | 0 |
| Sep | 6.5 | 3.5 |
| Oct | 7.5 | 5 |
| Nov | 8.5 | 6 |
| Dec | 9 | 7 |
Air quality in Ballajura 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 Ballajura is worst in May — around 17 µg/m³ PM2.5 (moderate), about 4.9× the cleanest month (December, 4 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) | 6 | 5 | 4 | 11 | 17 | 5 | 5 | 6 | 11 | 11 | 6 | 4 |
| Level | Good | Good | Good | Good | Moderate | Good | Good | Good | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 6 | Good |
| Feb | 5 | Good |
| Mar | 4 | Good |
| Apr | 11 | Good |
| May | 17 | Moderate |
| Jun | 5 | Good |
| Jul | 5 | Good |
| Aug | 6 | Good |
| Sep | 11 | Good |
| Oct | 11 | Good |
| Nov | 6 | Good |
| Dec | 4 | Good |
Growing season
Ballajura is frost-free year round — even the coldest nights rarely reach freezing, so there is no start or end to the growing season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Frost nights | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 100 | 0 |
| Feb | 100 | 0 |
| Mar | 100 | 0 |
| Apr | 100 | 0 |
| May | 100 | 0 |
| Jun | 100 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 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. Ballajura banks about 3,134 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around February.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°C·days) | 464 | 426 | 414 | 296 | 194 | 114 | 85 | 96 | 126 | 215 | 303 | 402 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 464 |
| Feb | 426 |
| Mar | 414 |
| Apr | 296 |
| May | 194 |
| Jun | 114 |
| Jul | 85 |
| Aug | 96 |
| Sep | 126 |
| Oct | 215 |
| Nov | 303 |
| Dec | 402 |
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.
Ballajura receives about 5.4 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 2.5 and 8.6 kWh/m².
The brighter stretch of the year lasts 5.9 months, from around Sep 28 to Mar 26. The brightest month is December, averaging about 8.4 kWh/m² (intense).
The dimmest month is June, down near 2.6 kWh/m² — roughly 69% less than the December peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 8.3 | 7.3 | 6.0 | 4.4 | 3.2 | 2.6 | 2.7 | 3.5 | 4.8 | 6.5 | 7.7 | 8.4 |
| Level | Intense | Intense | Intense | Bright | Moderate | Moderate | Moderate | Moderate | Bright | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 8.3 | Intense |
| Feb | 7.3 | Intense |
| Mar | 6.0 | Intense |
| Apr | 4.4 | Bright |
| May | 3.2 | Moderate |
| Jun | 2.6 | Moderate |
| Jul | 2.7 | Moderate |
| Aug | 3.5 | Moderate |
| Sep | 4.8 | Bright |
| Oct | 6.5 | Intense |
| Nov | 7.7 | Intense |
| Dec | 8.4 | Intense |
Where is Ballajura?
Ballajura sits at 31.8°S, 115.9°E, 40 m above sea level, in Australia. The nearest listed city is Landsdale, 5.0 km away.
Topography around Ballajura
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Ballajura.
Within 3 km, the terrain around Ballajura has only modest variations in elevation — a maximum elevation change of 70 m around an average of 42 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 232 m; within 80 km, significant variations in elevation — a maximum elevation change of 567 m.
The land around Ballajura is covered by artificial surfaces (50%) and trees (24%) within 3 km, artificial surfaces (43%), trees (24%) and grassland (20%) within 16 km, and trees (39%) and water (29%) within 80 km.
Australia travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type I
- 230 V · 50 Hz
- Prices
- ≈ 90% of US
- price level, 2025
- GDP per capita
- $65,130
- 2025
- Happiness
- 6.9 / 10
- World Happiness, 2025
- Homicide rate
- 0.9
- per 100k, 2023
- Road deaths
- 4.9
- per 100k/yr, 2019
- Income group
- High
- World Bank
- 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 Ballajura (-31.8406°, 115.8955°, elevation 40 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).