Thornlie climate — normals and trends

Q: What is the climate of Thornlie?

Thornlie has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 17.8 °C and it receives 554 mm of precipitation per year.

Q: What is the hottest day ever recorded in Thornlie?

The hottest day measured in Thornlie between 1940 and 2025 was 23 February 1991, reaching 45.8 °C.

Q: What is the coldest day in Thornlie?

The coldest day measured in Thornlie between 1940 and 2025 was 17 June 2006, at 1.5 °C.

Q: Does it snow in Thornlie?

Almost never: Thornlie sees virtually no snow, with about 0 frost days per year.

Q: Has the climate of Thornlie warmed?

Yes: Thornlie warmed by +0.6 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Thornlie?

The wettest day measured in Thornlie between 1940 and 2025 was 15 January 2018, with 117 mm of rain in 24 hours.

Q: What was the windiest day in Thornlie?

The windiest day measured in Thornlie between 1940 and 2025 was 22 September 1988, with winds reaching 52.1 km/h.

Q: What is the warmest month in Thornlie?

The warmest month in Thornlie is February (24.5 °C on average); the coldest is July (12.0 °C).

Q: How much does it rain in Thornlie?

Thornlie receives on average 554 mm of precipitation per year, spread over about 76 rainy days.

Q: Is it sunny in Thornlie?

Thornlie gets on average 10.9 hours of sunshine per day, roughly 3,979 hours per year over 1940-2025.

Thornlie (Australia) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 17.8 °C and it receives 554 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 February (24.5 °C on average) and the coldest is July (12.0 °C). Rainfall peaks in July.

Thornlie averages 0 frost days, 71 hot days (≥ 30 °C) and 76 rainy days per year.

Thornlie has warmed by +0.6 °C between 1940 and 2025, or +0.07 °C per decade. This trend is statistically significant.

The hottest day of the period reached 45.8 °C (on 23 February 1991) and the coldest 1.5 °C (on 17 June 2006).

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

ThornlieWestern Australia

coords: -32.06°, 115.95°
period: 1940–2025 · 86 yrs

CsaHot-summer MediterraneanWarmest monthFebruaryColdest monthJulyWettest monthJulyDriest monthDecember

Mean daily temperature

17.8°C

Average daily high

23.4°C

Average daily low

12.9°C

Annual rainfall

554mm

Sunshine / day

10.9h

Mean relative humidity

64%

Average peak wind

21.0km/h

Seasonal range

12.5°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

71 d/yr

Rainy days (≥ 1 mm)

76 d/yr

Annual snowfall

0.0 cm

Average feels-like high

22.4 °C

Average feels-like low

10.7 °C

Average peak gust

42.2 km/h

Tropical nights (≥ 20 °C)

26 d/yr

Solar radiation

19.5 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+0.6 °C

since 1940

+0.1 °C per decade · r² = 0.13 · p = < 0.001

19402025

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

45.8 °C

23 February 1991

Coldest day

1.5 °C

17 June 2006

Wettest day

117 mm

15 January 2018

Windiest day

52.1 km/h

22 September 1988

Strongest gust

109.8 km/h

22 September 1988

Hottest feels-like

46.7 °C

21 February 1955

Coldest feels-like

-2.5 °C

17 June 2006

Sunniest day

13.9 h

26 November 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	42.9 °C20 January 2025	2.2 °C25 July 2025	18.3 °C	585 mm	75
2024	42.5 °C19 February 2024	4.8 °C4 August 2024	19.1 °C	503 mm	83
2023	38.4 °C30 January 2023	3.0 °C27 June 2023	18.4 °C	343 mm	91
2022	41.5 °C5 February 2022	3.8 °C18 August 2022	17.9 °C	552 mm	67
2021	41.6 °C26 December 2021	4.0 °C22 June 2021	17.9 °C	661 mm	70
2020	40.7 °C4 February 2020	5.3 °C10 July 2020	18.2 °C	501 mm	77
2019	40.6 °C20 January 2019	3.4 °C18 May 2019	18.1 °C	416 mm	79
2018	39.1 °C22 December 2018	3.7 °C16 September 2018	17.6 °C	616 mm	57
2017	41.0 °C26 January 2017	3.4 °C2 August 2017	17.8 °C	693 mm	63
2016	40.7 °C8 February 2016	2.1 °C13 July 2016	17.3 °C	556 mm	67
2015	42.2 °C5 January 2015	2.5 °C9 July 2015	18.4 °C	432 mm	80
2014	42.0 °C11 January 2014	3.4 °C14 June 2014	18.4 °C	497 mm	79
2013	39.7 °C14 December 2013	3.3 °C8 July 2013	18.5 °C	557 mm	82
2012	40.9 °C31 December 2012	1.8 °C25 July 2012	18.3 °C	503 mm	75
2011	39.0 °C29 January 2011	4.1 °C4 July 2011	18.9 °C	698 mm	92
2010	42.6 °C18 January 2010	1.9 °C25 June 2010	18.2 °C	276 mm	88
2009	40.2 °C16 January 2009	4.4 °C14 July 2009	18.1 °C	525 mm	85
2008	41.0 °C17 January 2008	2.6 °C6 July 2008	17.6 °C	583 mm	70
2007	42.2 °C26 December 2007	4.4 °C12 August 2007	17.6 °C	485 mm	62
2006	39.6 °C16 December 2006	1.5 °C17 June 2006	17.8 °C	411 mm	69
2005	41.5 °C15 February 2005	1.8 °C7 July 2005	17.1 °C	525 mm	57
2004	40.1 °C11 January 2004	2.5 °C26 July 2004	17.8 °C	505 mm	74
2003	40.2 °C10 March 2003	3.6 °C12 June 2003	18.0 °C	567 mm	72
2002	39.8 °C19 December 2002	3.1 °C16 September 2002	17.8 °C	495 mm	64
2001	38.5 °C3 March 2001	2.3 °C5 July 2001	17.2 °C	390 mm	54
2000	40.0 °C27 December 2000	4.3 °C4 August 2000	18.0 °C	544 mm	65
1999	39.8 °C20 January 1999	3.2 °C8 August 1999	18.3 °C	729 mm	75
1998	42.1 °C7 January 1998	2.1 °C27 July 1998	18.0 °C	541 mm	80
1997	42.4 °C1 January 1997	2.1 °C15 July 1997	18.0 °C	491 mm	69
1996	41.6 °C11 February 1996	3.8 °C14 August 1996	18.2 °C	732 mm	74
1995	38.9 °C23 February 1995	4.7 °C12 June 1995	18.0 °C	584 mm	70
1994	40.7 °C20 January 1994	4.0 °C3 September 1994	18.3 °C	388 mm	78
1993	40.1 °C29 January 1993	3.1 °C17 July 1993	17.3 °C	428 mm	60
1992	38.9 °C16 January 1992	3.4 °C17 August 1992	17.5 °C	726 mm	54
1991	45.8 °C23 February 1991	4.1 °C8 July 1991	18.1 °C	587 mm	73
1990	38.3 °C27 February 1990	2.2 °C26 July 1990	17.1 °C	616 mm	48
1989	42.5 °C1 February 1989	2.5 °C5 July 1989	17.6 °C	478 mm	69
1988	40.7 °C26 January 1988	4.5 °C4 June 1988	18.4 °C	732 mm	89
1987	40.5 °C18 December 1987	3.2 °C1 August 1987	17.8 °C	547 mm	70
1986	41.4 °C24 January 1986	1.6 °C13 August 1986	17.1 °C	510 mm	58
1985	43.3 °C25 February 1985	3.3 °C6 August 1985	18.2 °C	507 mm	74
1984	41.0 °C31 January 1984	3.2 °C7 June 1984	17.4 °C	596 mm	61
1983	40.2 °C16 January 1983	2.7 °C11 July 1983	18.2 °C	735 mm	71
1982	43.4 °C4 February 1982	3.1 °C2 July 1982	17.5 °C	518 mm	60
1981	41.1 °C6 January 1981	1.9 °C22 June 1981	17.3 °C	642 mm	64
1980	44.2 °C22 January 1980	3.7 °C28 June 1980	17.5 °C	490 mm	70
1979	41.0 °C27 January 1979	2.2 °C4 September 1979	17.4 °C	478 mm	68
1978	42.2 °C12 January 1978	4.1 °C9 August 1978	18.3 °C	481 mm	90
1977	40.6 °C4 January 1977	3.3 °C3 September 1977	17.9 °C	468 mm	82
1976	41.1 °C1 January 1976	3.7 °C27 July 1976	17.7 °C	560 mm	69
1975	43.5 °C3 February 1975	1.8 °C2 August 1975	17.2 °C	538 mm	60
1974	41.7 °C25 January 1974	3.3 °C14 August 1974	17.4 °C	787 mm	70
1973	40.5 °C16 January 1973	2.2 °C25 June 1973	17.2 °C	601 mm	76
1972	40.4 °C10 December 1972	2.4 °C10 August 1972	18.4 °C	519 mm	95
1971	42.0 °C22 January 1971	3.0 °C22 July 1971	16.6 °C	644 mm	57
1970	39.6 °C1 February 1970	3.6 °C19 July 1970	17.4 °C	734 mm	72
1969	43.0 °C5 January 1969	2.7 °C22 July 1969	17.7 °C	414 mm	68
1968	42.8 °C15 January 1968	2.0 °C28 August 1968	16.4 °C	677 mm	43
1967	39.4 °C5 February 1967	4.4 °C9 July 1967	18.0 °C	615 mm	72
1966	40.1 °C21 January 1966	2.1 °C9 August 1966	17.3 °C	516 mm	57
1965	41.1 °C5 January 1965	4.7 °C15 August 1965	17.8 °C	744 mm	69
1964	40.3 °C8 March 1964	3.4 °C29 May 1964	17.4 °C	835 mm	56
1963	40.5 °C19 January 1963	5.1 °C15 June 1963	18.4 °C	1,066 mm	61
1962	40.3 °C4 February 1962	3.7 °C18 August 1962	18.2 °C	705 mm	77
1961	43.1 °C18 January 1961	4.7 °C25 July 1961	18.3 °C	483 mm	77
1960	38.7 °C24 December 1960	2.4 °C1 August 1960	16.9 °C	426 mm	57
1959	41.3 °C28 January 1959	4.8 °C12 August 1959	18.3 °C	426 mm	75
1958	40.1 °C11 January 1958	4.5 °C5 August 1958	18.4 °C	655 mm	107
1957	39.3 °C12 December 1957	2.1 °C13 July 1957	17.8 °C	635 mm	67
1956	42.7 °C29 January 1956	2.4 °C1 September 1956	17.2 °C	638 mm	61
1955	39.9 °C21 February 1955	1.6 °C22 June 1955	17.3 °C	742 mm	68
1954	39.7 °C10 January 1954	3.0 °C8 August 1954	17.5 °C	460 mm	70
1953	38.1 °C15 January 1953	3.4 °C21 July 1953	17.4 °C	593 mm	64
1952	40.2 °C31 January 1952	3.7 °C15 July 1952	17.4 °C	488 mm	72
1951	42.8 °C4 February 1951	2.4 °C18 August 1951	17.3 °C	436 mm	62
1950	41.7 °C28 February 1950	3.9 °C2 July 1950	18.1 °C	558 mm	88
1949	39.3 °C17 January 1949	4.2 °C21 September 1949	18.1 °C	569 mm	79
1948	42.1 °C24 January 1948	4.2 °C2 July 1948	17.6 °C	519 mm	69
1947	39.1 °C6 February 1947	3.1 °C6 September 1947	17.0 °C	565 mm	57
1946	38.3 °C17 December 1946	3.6 °C16 June 1946	17.3 °C	452 mm	74
1945	41.9 °C6 January 1945	3.7 °C25 August 1945	18.2 °C	507 mm	99
1944	43.0 °C3 February 1944	3.5 °C13 August 1944	17.8 °C	381 mm	66
1943	39.1 °C24 December 1943	3.1 °C6 August 1943	17.8 °C	329 mm	81
1942	39.8 °C2 January 1942	2.8 °C22 June 1942	17.4 °C	548 mm	69
1941	40.1 °C21 January 1941	1.8 °C30 July 1941	17.7 °C	493 mm	90
1940	41.1 °C23 December 1940	2.6 °C23 July 1940	17.6 °C	399 mm	86

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?

Year

Across the whole year

Average daily high

24.1 °C

+0.7 °C

Hot days (≥ 30 °C)

75 d/yr

Frost days (< 0 °C)

0 d/yr

Annual rainfall

585 mm

+31 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	32.6 °C	+1.1 °C	8 mm	-4 mm
Feb	30.7 °C	-0.7 °C	2 mm	-14 mm
Mar	30.9 °C	+1.9 °C	41 mm	+25 mm
Apr	25.4 °C	+1.0 °C	14 mm	-16 mm
May	22.7 °C	+2.5 °C	20 mm	-47 mm
Jun	18.4 °C	+1.2 °C	111 mm	+5 mm
Jul	15.8 °C	-0.3 °C	113 mm	+4 mm
Aug	17.1 °C	+0.4 °C	136 mm	+48 mm
Sep	19.4 °C	+0.9 °C	61 mm	+9 mm
Oct	21.1 °C	-0.4 °C	36 mm	+6 mm
Nov	25.3 °C	0.0 °C	37 mm	+18 mm
Dec	30.2 °C	+1.4 °C	6 mm	-3 mm

The year's extremes

Hottest day

42.9 °C

20 Jan 2025

Coldest day

2.2 °C

25 Jul 2025

Wettest day

37.8 mm

13 Mar 2025

Windiest day

41.2 km/h

14 Sep 2025

Strongest gust

86.4 km/h

3 Aug 2025

Hottest feels-like

42.6 °C

20 Jan 2025

Coldest feels-like

-0.7 °C

25 Jul 2025

Sunniest day

13.9 h

26 Nov 2025

What was the weather like that day?

Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.

Date

Frequently asked questions

What is the climate of Thornlie?

Thornlie has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 17.8 °C and it receives 554 mm of precipitation per year.

What is the hottest day ever recorded in Thornlie?

The hottest day measured in Thornlie between 1940 and 2025 was 23 February 1991, reaching 45.8 °C.

What is the coldest day in Thornlie?

The coldest day measured in Thornlie between 1940 and 2025 was 17 June 2006, at 1.5 °C.

Does it snow in Thornlie?

Almost never: Thornlie sees virtually no snow, with about 0 frost days per year.

Has the climate of Thornlie warmed?

Yes: Thornlie warmed by +0.6 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Thornlie?

The wettest day measured in Thornlie between 1940 and 2025 was 15 January 2018, with 117 mm of rain in 24 hours.

What was the windiest day in Thornlie?

The windiest day measured in Thornlie between 1940 and 2025 was 22 September 1988, with winds reaching 52.1 km/h.

What is the warmest month in Thornlie?

The warmest month in Thornlie is February (24.5 °C on average); the coldest is July (12.0 °C).

How much does it rain in Thornlie?

Thornlie receives on average 554 mm of precipitation per year, spread over about 76 rainy days.

Is it sunny in Thornlie?

Thornlie gets on average 10.9 hours of sunshine per day, roughly 3,979 hours per year over 1940-2025.

Are there tropical nights in Thornlie?

Yes: Thornlie has on average 26 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Thornlie?

In Thornlie, between 1940 and 2025, the highest apparent temperature reached 46.7 °C on 21 February 1955, and the lowest was -2.5 °C on 17 June 2006.

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