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Adelaide has a hot-summer Mediterranean climate (Csa) under the Köppen climate classification. The city has hot, dry summers and cool winters with moderate rainfall. Most precipitation falls in the winter months, leading to the suggestion that the climate be classified as a "cold monsoon". Rainfall is unreliable, light and infrequent throughout summer, although heavy falls can occur. The winter has fairly reliable rainfall with June being the wettest month of the year, averaging around 80 mm. Frosts are occasional, with the most notable occurrences in 1908 and 1982. Hail is common in winter.

Adelaide is a windy city with significant wind chill in winter, which makes the temperature seem colder than it actually is. Snowfall in the metropolitan area is extremely rare, although light and sporadic falls in the nearby hills and at Mount Lofty occur during winter. Dewpoints in the summer typically range from 8 to 10 °C (46 to 50 °F). There are usually several days in summer where the temperature reaches 40.0 °C (104.0 °F) or above; the frequency of these temperatures has been increasing in recent years. Temperature extremes range from −0.4 °C (31.4 °F), 8 June 1982 to 47.7 °C (117.9 °F), 24 January 2019. The city features 90.6 clear days annually.

The average sea temperature ranges from 13.7 °C (56.7 °F) in August to 21.2 °C (70.2 °F) in February. (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.