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Perth receives moderate, though highly seasonal, winter-based rainfall. Summers are generally hot, sunny and dry, lasting from December to March, with February generally the hottest month. Winters are relatively mild and wet, giving Perth a hot-summer Mediterranean climate (Köppen climate classification Csa). Perth has an average of 8.8 hours of sunshine per day, which equates to around 3,200 hours of sunshine and 138.7 clear days annually, making it Australia's sunniest capital city. Summers are typically hot and dry but not completely devoid of rain, with sporadic rainfall in the form of short-lived thunderstorms, weak cold fronts and on occasions decaying tropical cyclones from Western Australia's northwest, which can bring heavy rain. Temperatures above 35 °C (95 °F) occur, on average, 26 days per year and rise above 40 °C (104 °F) on 5 days per year. The highest temperature recorded in Perth was 46.2 °C (115.2 °F) on 23 February 1991, although Perth Airport recorded 46.7 °C (116.1 °F) on the same day. On most summer afternoons a sea breeze, known locally as the "Fremantle Doctor", blows from the southwest, providing relief from the hot northeasterly winds. Temperatures often fall below 30 °C (86 °F) a few hours after the arrival of the wind change. In the summer, the 3 p.m. dewpoint averages at around 12 °C (54 °F).

Winters are mild and wet, with most of Perth's annual rainfall between May and September. Winters see significant rainfall as frontal systems move across the region, interspersed with clear and sunny days where minimum temperatures tend to drop below 5 °C (41 °F). The lowest temperature recorded in Perth was −0.7 °C (30.7 °F) on 17 June 2006. The lowest temperature within the Perth metropolitan area was −3.4 °C (25.9 °F) on the same day at Jandakot Airport, although temperatures at or below zero are rare occurrences. The lowest maximum temperature recorded in Perth is 8.8 °C (47.8 °F) on 26 June 1956. It occasionally gets cold enough for frost to form. While snow has never been recorded in the Perth CBD, light snowfalls have been reported in outer suburbs of Perth in the Perth Hills around Kalamunda, Roleystone and Mundaring. The most recent snowfall was in 1968.

The rainfall pattern has changed in Perth and southwest Western Australia since the mid-1970s. A significant reduction in winter rainfall has been observed with a greater number of extreme rainfall events in the summer, such as the slow-moving storms on 8 February 1992 that brought 120.6 millimetres (4.75 in) of rain, heavy rainfall associated with a tropical low on 10 February 2017, which brought 114.4 millimetres (4.50 in) of rain, and the remnants of ex-Tropical Cyclone Joyce on 15 January 2018 with 96.2 millimetres (3.79 in). Perth was also hit by a severe thunderstorm on 22 March 2010, which brought 40.2 mm (1.58 in) of rain and large hail and caused significant damage in the metropolitan area.

The average sea temperature ranges from 18.9 °C (66.0 °F) in October to 23.4 °C (74.1 °F) in March. (Full article...)

Under the Köppen–Geiger classification, Sydney has a humid subtropical climate (Cfa) with "warm, sometimes hot" summers and "generally mild", to "cool" winters. The El Niño–Southern Oscillation, the Indian Ocean Dipole and the Southern Annular Mode play an important role in determining Sydney's weather patterns: drought and bushfire on the one hand, and storms and flooding on the other, associated with the opposite phases of the oscillation in Australia. The weather is moderated by proximity to the ocean, and more extreme temperatures are recorded in the inland western suburbs.

At Sydney's primary weather station at Observatory Hill, extreme temperatures have ranged from 45.8 °C (114.4 °F) on 18 January 2013 to 2.1 °C (35.8 °F) on 22 June 1932. An average of 14.9 days a year have temperatures at or above 30 °C (86 °F) in the central business district (CBD). In contrast, the metropolitan area averages between 35 and 65 days, depending on the suburb. The hottest day in the metropolitan area occurred in Penrith on 4 January 2020, where a high of 48.9 °C (120.0 °F) was recorded. The average annual temperature of the sea ranges from 18.5 °C (65.3 °F) in September to 23.7 °C (74.7 °F) in February. Sydney has an average of 7.2 hours of sunshine per day and 109.5 clear days annually. Due to the inland location, frost is recorded early in the morning in Western Sydney a few times in winter. Autumn and spring are the transitional seasons, with spring showing a larger temperature variation than autumn.

Sydney experiences an urban heat island effect. This makes certain parts of the city more vulnerable to extreme heat, including coastal suburbs. In late spring and summer, temperatures over 35 °C (95 °F) are not uncommon, though hot, dry conditions are usually ended by a southerly buster, a powerful southerly that brings gale winds and a rapid fall in temperature. Since Sydney is downwind of the Great Dividing Range, it occasionally experiences dry, westerly foehn winds typically in winter and early spring (which are the reason for its warm maximum temperatures). Westerly winds are intense when the Roaring Forties (or the Southern Annular Mode) shift towards southeastern Australia, where they may damage homes and affect flights, in addition to making the temperature seem colder than it actually is.

Rainfall has a moderate to low variability and has historically been fairly uniform throughout the year, although in recent years it has been more summer-dominant and erratic. Precipitation is usually higher in summer through to autumn, and lower in late winter to early spring. In late autumn and winter, east coast lows may bring large amounts of rainfall, especially in the CBD. In the warm season black nor'easters are usually the cause of heavy rain events, though other forms of low-pressure areas, including remnants of ex-cyclones, may also bring heavy deluge and afternoon thunderstorms. Snowfall was last reported in 1836, though a fall of graupel, or soft hail, in the Upper North Shore was mistaken by many for snow, in July 2008. In 2009, dry conditions brought a severe dust storm towards the city.

Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °C (°F) 45.8
(114.4)
42.1
(107.8)
39.8
(103.6)
35.4
(95.7)
30.0
(86.0)
26.9
(80.4)
26.5
(79.7)
31.3
(88.3)
34.6
(94.3)
38.2
(100.8)
41.8
(107.2)
42.2
(108.0)
45.8
(114.4)
Mean maximum °C (°F) 36.8
(98.2)
34.1
(93.4)
32.2
(90.0)
29.7
(85.5)
26.2
(79.2)
22.3
(72.1)
22.9
(73.2)
25.4
(77.7)
29.9
(85.8)
33.6
(92.5)
34.1
(93.4)
34.4
(93.9)
38.8
(101.8)
Mean daily maximum °C (°F) 27.0
(80.6)
26.8
(80.2)
25.7
(78.3)
23.6
(74.5)
20.9
(69.6)
18.3
(64.9)
17.9
(64.2)
19.3
(66.7)
21.6
(70.9)
23.2
(73.8)
24.2
(75.6)
25.7
(78.3)
22.8
(73.0)
Daily mean °C (°F) 23.5
(74.3)
23.4
(74.1)
22.1
(71.8)
19.5
(67.1)
16.6
(61.9)
14.2
(57.6)
13.4
(56.1)
14.5
(58.1)
17.0
(62.6)
18.9
(66.0)
20.4
(68.7)
22.1
(71.8)
18.8
(65.8)
Mean daily minimum °C (°F) 20.0
(68.0)
19.9
(67.8)
18.4
(65.1)
15.3
(59.5)
12.3
(54.1)
10.0
(50.0)
8.9
(48.0)
9.7
(49.5)
12.3
(54.1)
14.6
(58.3)
16.6
(61.9)
18.4
(65.1)
14.7
(58.5)
Mean minimum °C (°F) 16.1
(61.0)
16.1
(61.0)
14.2
(57.6)
11.0
(51.8)
8.3
(46.9)
6.5
(43.7)
5.7
(42.3)
6.1
(43.0)
8.0
(46.4)
9.8
(49.6)
12.0
(53.6)
13.9
(57.0)
5.3
(41.5)
Record low °C (°F) 10.6
(51.1)
9.6
(49.3)
9.3
(48.7)
7.0
(44.6)
4.4
(39.9)
2.1
(35.8)
2.2
(36.0)
2.7
(36.9)
4.9
(40.8)
5.7
(42.3)
7.7
(45.9)
9.1
(48.4)
2.1
(35.8)
Average rainfall mm (inches) 91.1
(3.59)
131.5
(5.18)
117.5
(4.63)
114.1
(4.49)
100.8
(3.97)
142.0
(5.59)
80.3
(3.16)
75.1
(2.96)
63.4
(2.50)
67.7
(2.67)
90.6
(3.57)
73.0
(2.87)
1,149.7
(45.26)
Average rainy days (≥ 1 mm) 8.2 9.0 10.1 7.9 7.9 9.3 7.2 5.6 5.8 7.6 8.7 7.9 95.2
Average afternoon relative humidity (%) 60 62 59 58 58 56 52 47 49 53 57 58 56
Average dew point °C (°F) 16.5
(61.7)
17.2
(63.0)
15.4
(59.7)
12.7
(54.9)
10.3
(50.5)
7.8
(46.0)
6.1
(43.0)
5.4
(41.7)
7.8
(46.0)
10.2
(50.4)
12.6
(54.7)
14.6
(58.3)
11.4
(52.5)
Mean monthly sunshine hours 232.5 205.9 210.8 213.0 204.6 171.0 207.7 248.0 243.0 244.9 222.0 235.6 2,639
Percent possible sunshine 53 54 55 63 63 57 66 72 67 61 55 55 60
Source 1: Bureau of Meteorology[1][2][3][4]
Source 2: Bureau of Meteorology, Sydney Airport (sunshine hours)[5]
(Full article...)

References

This section contains references and notes. It should be empty.

  1. ^ "Sydney (Observatory Hill) Period 1991-2020". Bureau of Meteorology. Retrieved 14 April 2020.
  2. ^ "Sydney (Observatory Hill): all years". Bureau of Meteorology. Retrieved 4 June 2018.
  3. ^ "Sydney (Observatory Hill): highest temperatures". Bureau of Meteorology. Archived from the original on Sep 27, 2023. Retrieved 23 September 2023.
  4. ^ "Sydney (Observatory Hill): lowest temperatures". Bureau of Meteorology. Retrieved 23 September 2023.
  5. ^ "Climate statistics for Australian locations Sydney Airport AMO". Bureau of Meteorology.