GreenlyFrost dates and when to plant in Western Australia
Australia
None of the 2 cities in Western Australia had frost in 2016–2025, so crops are planted by warmth and rain rather than by frost dates.
Frost dates by city in Western Australia
| City | Last spring frost | First autumn frost | Frost-free days | Climate zone | Tomato: window |
|---|---|---|---|---|---|
| Bunbury | none in ten years | none in ten years | — | No frost in ten years | — |
| Perth | none in ten years | none in ten years | — | No frost in ten years | — |
Median of 2016–2025 for the 25 km grid cell of the city: the last day at or below 0 °C in spring and the first in autumn (ERA5 reanalysis via Open-Meteo). In a cold year a frost can come a week or two later — Greenly warns 48 hours ahead.
Weather by month in Western Australia
Across the 2 cities the warmest month is January (average days 29.8 °C) and the coldest August (average nights 9.1 … 9.9 °C). No city here averages below 0 °C at night in any month.
| Month | Day, °C | Night, °C | Rain, mm |
|---|---|---|---|
| January | 29.8 °C | 17.1 … 19.2 °C | 18 |
| February | 29.5 … 30 °C | 17.2 … 19.1 °C | 21 |
| March | 27.4 … 28.5 °C | 16.4 … 18.2 °C | 38 |
| April | 23.2 … 24.8 °C | 13.6 … 15 °C | 41 |
| May | 19.7 … 21.6 °C | 11.5 … 12.3 °C | 87 |
| June | 17 … 18.4 °C | 9.9 … 10.5 °C | 123 |
| July | 16.1 … 17.4 °C | 9.4 … 10.2 °C | 140 |
| August | 16.3 … 17.6 °C | 9.1 … 9.9 °C | 129 |
| September | 17.7 … 19.2 °C | 9.9 … 11 °C | 65 |
| October | 19.7 … 21.3 °C | 11.1 … 12.6 °C | 50 |
| November | 24 … 25 °C | 13.2 … 15.2 °C | 23 |
| December | 28 … 28.5 °C | 15.5 … 18 °C | 10 |
Day and night: the lowest … highest monthly average among the cities; rain: the middle city (ERA5 via Open-Meteo).
