Swanbourne Long-term Averages

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Ann
Mean Max (°C)	29.9	30.4	28.8	25.3	22.2	19.4	18.5	18.9	20.0	22.3	25.4	28.1	24.1
Mean Min (°C)	18.4	18.8	17.6	15.2	12.6	10.7	9.9	10.2	11.1	12.5	14.8	16.8	14.0
Mean Rain (mm)	16.3	11.8	21.3	37.5	87.7	128.1	151.1	116.7	76.8	42.2	22.7	9.6	723.4
Median Rain (mm)	1.2	1.7	12.2	29.2	81.2	126.2	144.4	122.6	80.2	32.4	21.7	5.1	742.4
Mean Rain Days	2.4	2.1	4.0	7.2	11.8	16.6	18.8	17.4	14.8	8.9	5.4	3.2	112.9

Swanbourne Daily Records

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Ann
High Max (°C)	44.3	43.0	42.8	37.3	31.5	26.2	25.9	30.2	34.7	37.1	41.1	43.7	44.3
Low Max (°C)	19.5	17.1	18.4	16.6	13.2	12.5	12.2	11.6	13.2	15.8	16.0	19.3	11.6
High Min (°C)	28.4	28.7	28.8	23.9	20.2	17.1	16.0	17.3	19.0	21.1	25.6	27.2	28.8
Low Min (°C)	4.7	7.3	7.5	3.0	4.8	2.9	2.4	3.1	3.1	2.0	4.3	5.7	2.0
High Rain (mm)	138.6	97.4	51.8	64.0	62.2	76.0	75.0	82.0	45.0	76.0	35.2	30.2	138.6

Swanbourne Monthly Records

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Ann
High Mn. Max (°C)	33.1	34.0	31.2	27.9	24.6	21.2	19.5	21.5	22.3	25.0	29.0	30.5	25.4
Low Mn. Max (°C)	27.6	27.8	26.1	23.0	20.5	17.1	16.7	17.4	17.7	19.8	22.7	22.8	22.8
High Mn. Min (°C)	20.5	21.0	19.1	17.7	15.1	12.8	11.8	12.6	13.1	14.6	17.6	19.5	15.1
Low Mn. Min (°C)	16.4	17.0	16.1	12.9	10.8	9.0	7.6	8.2	9.0	10.2	12.6	14.5	12.9
High Rain (mm)	145.8	141.8	82.4	146.4	211.6	259.8	285.4	209.4	160.8	129.4	77.0	67.0	951.8
Low Rain (mm)	0.0	0.0	0.0	0.4	15.2	23.2	42.0	31.0	18.0	5.0	1.0	0.0	497.8

Swanbourne Annual Temperatures & Rainfall

Swanbourne Average Number of Days With Temperatures

	Jan	Feb	Mar	Apr	May	Sep	Oct	Nov	Dec	Ann
≥ 40°C	0.8	0.7	0.3	0.0	0.0	0.0	0.0	0.1	0.4	2.3
≥ 35°C	5.2	5.5	2.7	0.3	0.0	0.0	0.2	1.4	3.9	19.2
≥ 30°C	13.4	13.9	11.2	3.2	0.2	0.2	1.9	4.9	9.6	58.8
≤ 2°C	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
≤ 0°C	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Swanbourne 'per Week' Values (14th/86th Percentiles)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Ann
High Max	35.0	35.9	33.8	29.1	25.0	21.4	20.2	20.6	21.9	25.4	30.0	34.2	30.3
Low Max	24.8	24.9	24.2	21.6	19.1	17.1	16.3	16.6	17.4	18.8	21.1	22.8	18.2
High Min	21.0	21.6	20.8	18.2	16.0	13.8	13.0	13.0	13.9	15.1	17.5	19.6	18.5
Low Min	15.1	15.1	13.9	11.8	9.3	7.5	6.2	6.8	7.9	9.0	11.5	13.2	9.0

Swanbourne Data Availability

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Ann
Years of Minima	32	32	31	31	31	31	31	31	31	32	32	32	31.0
Earliest Entry	1994	1994	1994	1994	1994	1994	1994	1994	1993	1993	1993	1993	1993
Latest Entry	2025	2025	2025	2024	2024	2024	2024	2024	2024	2024	2024	2024	2025
Years of Maxima	32	32	31	31	30	31	31	31	31	32	32	32	31.0
Earliest Entry	1994	1994	1994	1994	1994	1994	1994	1994	1993	1993	1993	1993	1993
Latest Entry	2025	2025	2025	2024	2024	2024	2024	2024	2024	2024	2024	2024	2025
Years of Rainfall	32	32	31	31	31	31	31	31	31	31	32	32	31.0
Earliest Entry	1994	1994	1994	1994	1994	1994	1994	1994	1994	1994	1993	1993	1993
Latest Entry	2025	2025	2025	2024	2024	2024	2024	2024	2024	2024	2024	2024	2025

Station Details

SWANBOURNE
Perth, Western Australia

31.9560°S 115.7619°E 41m AMSL
Commenced 1985

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Months of rain in a day in southern WA

12:31 AEST Heavy rain has fallen in southern parts of Western Australia, with the heaviest day of rain (in any month) in at least 20 years at some locations.