Canberra frosts and the cold south

By Julia · weather-au.com editorial team · Published 23 October 2026 · 4 min read

Nobody arrives in Australia expecting to scrape ice off a windscreen. And yet in Canberra, in an average year of the last ten, 28 nights fall below 0 °C. This article counts those nights, shows when they come, and sets them beside Melbourne, Hobart and Adelaide, where hardly any do. At the end, the cold desert nights of Alice Springs, taken from the site's normals.

Remember the calendar: winter is June to August, and the cold is a June, July and August business, as the chart will show.

Where the frost is

Over 2016 to 2025 Canberra has between 16 nights below 0 °C (2022) and 51 (2017), with 35 in 2025 and 31 in 2024. Hobart has 0 or 1 a year, Melbourne 0, 1 or 2, and Adelaide none at all in ten years. These are daily minimum temperatures from a reanalysis grid, and a grid cell understates the frost of low spots and valleys, so the real Hobart and Melbourne counts at the edge of town are very probably higher. The ranking is what matters: Canberra sits at an altitude of about 570 metres, and the coastal capitals are close to sea level.

The coldest night in each year gives the same ranking.

Canberra's coldest night is −6.1 °C in 2017, the year with the most frost; its mildest "coldest night" is −2.4 °C in 2016. Melbourne reaches −1.7 °C in 2018 and −0.9 °C in 2022. Hobart never goes lower than −0.4 °C in these data, and Adelaide's coldest night in ten years is 1.1 °C.

When the frost comes

In an average year, Canberra's nights below zero are 1.7 in May, 7.8 in June, 9.4 in July, 7.3 in August and 2.1 in September; none from October to April. July is the peak, at about one night in three.

The first frost of the year is on 11 May at the earliest (2020), and 21 June at the latest (2018). The last one falls between 24 August (2022) and 28 September (2020). So in none of the ten years did a frost occur after the end of September, and none before May. If you are planting something tender in a Canberra garden, our reading of the table is to wait for October. That is a rule drawn from ten years of reanalysis, not from a local gardening authority.

Cold days, too

Cold nights are one thing; days that stay cold are another. We counted days on which the maximum itself does not reach 10 °C. Canberra has 26 of them in an average year, Hobart 13, Melbourne 1.3 and Adelaide 0.2. In July Canberra's normal maximum is 10.6 °C and its minimum 2.4 °C, a daily swing of 8.2 °C. Hobart's July is 10.7 °C and 5.3 °C: almost the same day temperature as Canberra, but a night warmer by about 3 °C, probably thanks to the sea.

The other extreme: the desert at night

Alice Springs lies just south of the Tropic of Capricorn, in the middle of the continent, far from any sea. The normals show what that means.

July in Alice Springs has a maximum of 19.6 °C and a minimum of 6.0 °C, so the daily swing is 13.6 °C, the widest of the eight cities, and it rains 8 mm. Canberra's swing is 8.2 °C, Sydney's 5.7 °C, Perth's 7.3 °C. Dry air and a clear sky radiate heat away fast. The minimum of 6.0 °C is a normal; individual July nights in the desert go lower, and we have not fetched the daily series for Alice Springs, so we make no claim about frost counts there.

What to take away

1. Canberra is a cold-winter city. Bring a coat for nights from May to September; July alone brings frost on about nine nights.
2. The coast is not. Melbourne and Hobart nights drop to around 5 or 6 °C in the normals for July; frost is rare.
3. In the desert, plan for the swing, not the average. A pleasant 20 °C afternoon can be followed by a night at 6 °C or less.
4. Mountains are another matter. Mount Kosciuszko, the highest summit on the mainland, and Mount Wellington above Hobart are higher and colder in the usual way of mountains. We have no daily archive for them here.

For the reverse side of the year, see summer heat counted; for the best months in each region, when to visit Australia.

Period of the data cited: 2016–2025.