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définition - HUMID SUBTROPICAL

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Humid subtropical climate

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Humid subtropical climate zones of the world

Humid subtropical climate (Köppen Cfa or Cwa) is a climate zone characterized by hot, humid summers and cool winters. This climate type covers a broad category of climates, and the term "subtropical" may be a misnomer for the winter climate.

Significant amounts of precipitation occur in all seasons in most areas. Winter rainfall (and sometimes snowfall) is associated with large storms that the westerlies steer from west to east. Most summer rainfall occurs during thunderstorms and an occasional tropical storm, hurricane or cyclone.

Humid subtropical climates lie on the southeast side of all continents except Antarctica, roughly between latitudes 25° and 40° north and south. Two of the few exceptions where this climate zone reaches up to latitude 46° north are in the Po Valley and the Toulouse regions in Europe.

The Koppen definition of this climate is for the coldest month's mean temperature to be between −3 °C (26.6 °F) and 18 °C (64 °F), and the warmest month to be above 22 °C (72 °F); along with either a dry winter- with less than one tenth of the precipitation of the wettest summer month- (Köppen: w) or without dry season (Köppen: f, winter months get more than one tenth of the precipitation of the wettest summer month, and summer months get at least 40 mm (1.6 in) per month or more than one third as much the wettest winter month).[1]

Contents

Africa

In Africa, the humid subtropical climates are found in two separate areas on the southern hemisphere of the continent. The Cwa climate is found in over a large portion of the interior of the Middle and Eastern African regions. This area includes; central Angola, northeastern Zimbabwe, the Niassa, Manica and Tete provinces of Mozambique, the southern Congo provinces, southwest Tanzania, and the majority of Malawi, and Zambia. Some lower portions of the Ethiopian Highlands also have this climate. - - The Cfa climate covers a relatively small area of coastal KwaZulu-Natal and Eastern Cape provinces of South Africa, and is characterised by oceanic influences that give mild temperatures, especially in winter when temperatures do not drop as low as in many other regions within the humid subtropical category. For example Richards Bay experiences a daily average minimum of 12 °C (54 °F) and a daily average maximum of 23 °C (73 °F) in the coldest month, and did not drop below 4 °C (39 °F) in the thirty years of records from 1961. Rainfall is distributed throughout the year, but is heavier in summer, with a high of 172 millimetres (6.8 in) for January and a low of 57 millimetres (2.2 in) for June at Richards Bay.

Asia

East Asia

Humid subtropical climates in Asia differ from those in other continents, in that they generally have a pronounced dry winter even on the poleward boundary of this region, with most falling in the Cwa classification. In East Asia, it’s found in sections of the Himalayas, China, the South Coast of South Korea and Japan (most of Honshū, Kyūshū and Shikoku). Some major Asian cities in this climate zone include Kathmandu, Chengdu, Chongqing, Shanghai, Nanjing, Busan, Kyoto and Tokyo. Hong Kong and Taipei are on the equatorward boundary of this zone and Qingdao is on the northern boundary.

In most of this region, there is very little precipiation during the winter, owing to the powerful anticyclonic winds from Siberia. Only in those parts of coastal eastern China, between approximately the Yellow River and the Pearl River, is there sufficient winter rainfall to produce a Cfa climate; even in these areas, rainfall and streamflow show a very pronounced summer peak quite unlike other regions of this climate type. The only area where the winter rainfall equals the summer rain is on the "San-in" (Sea of Japan) coast of Japan, which during winter is effectively on the windward side of the westerlies. The winter rainfall in these regions is usually produced by low pressure systems off the east coast that develop in the onshore flow from the Siberian high. Summer rainfall comes from the East Asian Monsoon and from frequent typhoons. Annual rainfall is generally over 1,000 mm (40 inches), and in areas below the Himalayas can be much higher still.

South Asia

Humid subtropical climates can also be found in South Asia, primarily in northern India. However, the humid subtropical climates exhibited here differ markedly from humid subtropical climates in East Asia (and for that matter a good portion of the globe). Winters here are typically mild, dry and relatively short. They also tend to be foggy. Summers tend to be long and very hot, with high temperatures sometimes exceeding 40°C. They also tend to be extremely dry, complete with dust storms, traits usually associated with arid or semiarid climates. This is followed by the monsoons where the region experiences heavy rain. Average high temperatures decreases during the monsoon season but humidity increases. This results in hot and humid conditions, similar to summers in humid subtropical climates. Cities such as New Delhi, Lucknow and Kanpur exhibits this atypical version of the climate.

In South Asia, humid subtropical climates generally border on continental climates as altitude increases, or on winter-rainfall climates in Pakistan.

Southwestern Asia (Northern Middle East and Caucasus)

Although humid subtropical climates in Asia are mostly confined to the southeastern quarter of the continent, there are areas on the Caspian Sea and Black Sea with humid subtropical climates that are unusually warm for their high latitudes and also unusual for this climate type, that snowfall in winter is relatively common, but is usually of a short duration.

In the narrow Caspian coastal strip of Iran (Gilan and Mazandaran) a humid subtropical climate prevails at an unusually high latitude. Annual rainfall ranges from around 740 mm (29 inches) at Sari to over 2,000 mm (78 inches) at Bandar-e Anzali, and is heavy throughout the year, with a maximum in October or November when Bandar-e Anzali can average 400 millimetres (16 inches). Temperatures are generally moderate in comparison with other parts of Southwestern Asia (Middle East). In Rasht, the average maximum in July is around 28 °C (82 °F) but with near-saturation humidity, whilst in January it is around 9 °C (48 °F). The heavy, evenly distributed rainfall extends north into the Caspian coastal strip of Azerbaijan up to its northern border but this climate in Azerbaijan is, however, a Cfb/Cfa (Oceanic climate/Humid subtropical climate) borderline case. During winter, the coastal areas can receive snowfall, but is usually of a short duration.Annual rainfall in Lankaran in the southeast averages up to 1,800 mm (70 inches) and is heavy throughout the year; and annual rainfall is generally over 1,000 mm (40 inches) in the foothills of the Caucasus in the northeast, as altitude increases and the humid subtropical climate changes to the oceanic climate[2]

Western Georgia in the Kolkheti Lowland and the north coast of Turkey, have a climate similar to that of Gilan and Mazandaran in Iran and very similar to that of southeastern and northeastern Azerbaijan. Temperatures range from 22 °C in summer to 5 °C in winter and rainfall is even heavier than in Caspian Iran, up to 2,300 millimetres per year in Hopa (Turkey) and up to 2,560 millimetres per year in Batumi (Georgia) falling throughout the year. This climate in northern Turkey and western Georgia is, again, a Cfb/Cfa (Oceanic climate/Humid subtropical climate) borderline case. And again, during winter, the coastal areas can receive snowfall, but is usually of a short duration.

North America

In North America, humid subtropical climates are almost exclusively the domain of the American South, including the following states: the eastern half of Texas (includes South Texas), Louisiana, most of Arkansas, Alabama, Mississippi, Tennessee, Georgia, Kentucky, most of Florida, and Virginia excluding upland regions of the Appalachians and southwestern West Virginia though the climate in many of these states including Alabama, Georgia, Tennessee and Arkansas are subject to extremes. It also exists in the Mid-Atlantic, in low-lying or urban areas in Maryland, Delaware, southeastern Pennsylvania, southern and central New Jersey, Long Island, the island of Manhattan, and along the immediate coastline of southern Connecticut. It can also be found in the Midwest, primarily in the southern portions of Missouri, Illinois, Indiana, and Ohio. The Mid-Atlantic and Midwestern areas included in this climate typically see snowfall during the winter, with occasional heavy storms. The classic example of a humid subtropical climate is the Deep South, because the summers are long and almost tropical, and temperatures reach freezing only a few times in the winter with rare snowfall, usually three inches or less. Summers in this zone are hot and humid, with daily averages above 25°C (77°F). Major cities typically included in this climate zone include: Houston, Dallas, Atlanta, Louisville, Memphis, Birmingham, New Orleans, Nashville, Charlotte, Raleigh, Baltimore, Jacksonville, Orlando, Tampa, Richmond, Norfolk, Tulsa, Washington, D.C. and Little Rock. Major cities on the northern periphery of this zone include: St. Louis, Evansville, Indiana, Cincinnati, Philadelphia and New York City. The climates of Dallas, San Antonio and Oklahoma City display a marked reduction in rainfall that suggests a shading into steppe climates to be found farther west, as in Lubbock, Texas. There is some debate over whether the New York City area (including Long Island and southern Connecticut) falls under this category; depending on source, they could fall either in Cfa or Dfa, though they usually fall under Cfa or humid subtropical due to their proximity to the Atlantic Ocean and the warming Gulf Stream current.

In Mexico, there are small areas of Cfa and Cwa climates. They are both caused by the high elevations of Trans-Mexican Volcanic Belt and Sierra Madre Oriental in areas which would otherwise be classified as tropical.

Characteristics and variants

The southernmost limits of this climate lie just north of South Florida and around southern coastal Texas. Areas farther south have a true tropical climate, with very warm weather year round and minimal temperature differences between seasons. By contrast, the northernmost limits of the humid subtropical region experience much greater seasonal variation, as they draw influence from the Atlantic Ocean and its bays, Delaware Bay and Chesapeake Bay. Farther away from the Atlantic, it is found at the edge of the Blue Ridge Mountains, west to Louisville, Kentucky, then roughly along the lower Ohio River through Paducah, Kentucky to a line near Springfield, Missouri. Areas farther north than this, inland, or at a higher elevation, fall into the humid continental climate category with harsher winters. Snowfall varies greatly in this climate zone. In locations at the southern limits of this zone and areas around the Gulf Coast, cities such as Orlando, Tampa, Houston and New Orleans rarely see snowfall, which occurs, at most, a few times per generation. In inland southern cities farther north, such as Atlanta, Memphis, Little Rock, Nashville, Dallas, Charlotte and Raleigh, snow falls once or twice a season and is usually three inches or less and occasional snow and ice storms are not unusual; however, most of the winter temperatures remain above or well above freezing with hardy plant growth. In the northern limits of this climate zone, however, cities such as Cincinnati, Philadelphia and New York City experience snow every winter, sometimes accumulating heavily although it melts more quickly than in regions to the north. Precipitation is plentiful in the humid subtropical climate zone. Although most areas tend to have precipitation spread evenly throughout the year, a somewhat monsoon-like pattern is seen in parts of the Southeast (in locales such as Augusta, Georgia and Columbia, South Carolina), which experience dry winters (by humid subtropical standards) and warm spring, followed immediately by a long, hot, rainy and humid summer. In addition, areas in Texas that are slightly inland from the Gulf of Mexico, such as Austin, generally see a peak of precipitation in the spring, and a deep, drought-like nadir in mid-summer.

South America

Most of north-eastern Argentina, Uruguay, southern Brazil, and eastern Paraguay is Cfa.

The Cwa climate occurs in parts of tropical highlands of São Paulo state, Minas Gerais and near the Andean highland in northwestern Argentina.

Australia

The humid subtropical climate dominates most of eastern Australia south from about Bundaberg, Queensland down to about Bega on the south coast of New South Wales. It extends from the coast inland to about Dubbo and the Warrumbungle and Nandewar mountain ranges, where it grades into arid climates. In the Great Dividing Range and to the south of about Bega, this climate type grades into an oceanic climate (Köppen Cfb) as at Guyra and Katoomba, in New South Wales.

This zone contains the only regions where soils are not acutely deficient in phosphorus, as well as the heaviest rainfall south of the Tropic of Capricorn, making it prime agricultural country, centred on towns such as Coffs Harbour, Grafton, Kempsey, Port Macquarie, Tamworth, and Moree.

Many of Australia's major cities are also in this climate zone, including Brisbane, Gold Coast and Newcastle.

Variations in Australia

There is considerable variation in climate within this zone. Annual rainfall on the coast can reach as high as 2,000 mm (80 inches) in favourable locations and is generally above 1,000 mm (40 inches). However, because most of the heaviest two- and three-day rainfalls in the world occur in this coastal zone as a result of east coast lows forming to the north of a large high pressure system, there can be great variation in rainfall from year to year. At Lismore in the centre of this zone, the annual rainfall can range from less than 550 mm (22 inches) in 1915 to more than 2,780 mm (110 inches) in 1950. There is usually a distinct summer rainfall maximum that becomes more pronounced moving northwards: in Brisbane the wettest month (February) receives five times the rainfall of the driest (September) hot but not excessive: the average maximum in February is usually around 29 °C (84 °F) and in July around 21 °C (70 °F). Frosts are extremely rare except at higher elevations.

In the Darling Downs and further south, the summer rainfall maximum is less marked and by the time one reaches Dubbo, there are actually on average more rainy days in the winter months. Temperatures here display much greater seasonal variation, with summers being generally very hot with maxima of around 32 °C (90 °F) and frosts being common during dry winters: at Mitchell the temperature has reached as low as -9.4 °C (15 °F).

North of the Cfa climate zone there is a zone centred upon Rockhampton and extending up to the Atherton Tableland of Köppen Cwa climate. This has a very pronounced dry winter with often negligible rainfall between June and October, and winter temperatures generally only slightly below 18°C, above which one would have a tropical savanna, or Aw, climate.

Europe

Some areas of Europe, such as parts of the northeastern interior of the Iberian Peninsula, northern Italy, parts of coastal Croatia, coastal Slovenia, much of Serbia and Kosovo, the Black Sea coast, north-western Bulgaria, parts of Romania and southernmost Ukraine have summers too warm (>22°C in the warmest month) to qualify as oceanic, no freezing month, and enough summer precipitation to preclude their classification as Mediterranean. These narrow bands of climate are classified as humid sub-tropical Cfa.

In the Azores, some islands have this climate, with very amene and rainy winters (> 13°C), hot summers (> 22 or 23°C) but with no dry season during the warmest period, which means that they can be classified neither as oceanic, nor as Mediterranean, but only as subtropical humid climate, as with Corvo Island.

Examples

Notable Cities in North & South America with Humid subtropical climates

Notable Cities outside North & South America with Humid subtropical climates


    • (Cwa) Humid subtropical climate with a dry winter.
    • (Cfa/Cfb) Humid subtropical climate/Oceanic climate is a borderline case, however.
    • (Cfa/Cfb/Dfa) Humid subtropical climate/Oceanic climate/Humid continental climate, another borderline case.

Charts of Selected Cities with Humid Subtropical Climates

Northern hemisphere

Tokyo
Climate chart (explanation)
JFMAMJJASOND
 
 
45
 
10
1
 
 
60
 
10
2
 
 
100
 
13
4
 
 
125
 
18
10
 
 
138
 
23
15
 
 
185
 
25
19
 
 
126
 
29
22
 
 
148
 
31
24
 
 
180
 
26
20
 
 
164
 
21
14
 
 
89
 
17
9
 
 
46
 
12
4
average max. and min. temperatures in °C
precipitation totals in mm
source: Climate-Charts.com
New York City
Climate chart (explanation)
JFMAMJJASOND
 
 
105
 
3
-3
 
 
80
 
5
-2
 
 
111
 
10
2
 
 
109
 
16
7
 
 
119
 
22
12
 
 
98
 
26
17
 
 
117
 
29
21
 
 
107
 
28
20
 
 
107
 
24
16
 
 
98
 
18
10
 
 
111
 
12
5
 
 
100
 
6
0
average max. and min. temperatures in °C
precipitation totals in mm
source: [2]
Shanghai
Climate chart (explanation)
JFMAMJJASOND
 
 
48
 
8
1
 
 
58
 
8
1
 
 
84
 
13
4
 
 
94
 
19
10
 
 
94
 
25
15
 
 
180
 
28
19
 
 
147
 
32
23
 
 
142
 
32
23
 
 
130
 
28
19
 
 
71
 
23
14
 
 
51
 
17
7
 
 
36
 
12
2
average max. and min. temperatures in °C
precipitation totals in mm
source: [3]
New Orleans
Climate chart (explanation)
JFMAMJJASOND
 
 
149
 
17
6
 
 
139
 
18
8
 
 
133
 
22
12
 
 
128
 
26
14
 
 
117
 
29
19
 
 
173
 
32
22
 
 
157
 
33
23
 
 
156
 
33
23
 
 
141
 
31
22
 
 
77
 
27
16
 
 
129
 
22
11
 
 
129
 
18
8
average max. and min. temperatures in °C
precipitation totals in mm
source: [4]

Southern hemisphere

Buenos Aires
Climate chart (explanation)
JFMAMJJASOND
 
 
119
 
30
20
 
 
118
 
29
19
 
 
134
 
26
17
 
 
97
 
23
13
 
 
74
 
19
10
 
 
63
 
16
8
 
 
66
 
15
8
 
 
70
 
17
8
 
 
73
 
19
10
 
 
119
 
22
13
 
 
109
 
25
15
 
 
105
 
28
18
average max. and min. temperatures in °C
precipitation totals in mm
source: [5]
São Paulo
Climate chart (explanation)
JFMAMJJASOND
 
 
240
 
27
19
 
 
200
 
28
19
 
 
140
 
27
18
 
 
50
 
25
17
 
 
40
 
23
15
 
 
30
 
21
13
 
 
20
 
21
12
 
 
30
 
22
13
 
 
50
 
22
13
 
 
140
 
25
15
 
 
120
 
25
17
 
 
190
 
26
18
average max. and min. temperatures in °C
precipitation totals in mm
source: [6]
Richards Bay
Climate chart (explanation)
JFMAMJJASOND
 
 
172
 
29
21
 
 
167
 
29
21
 
 
107
 
29
20
 
 
109
 
27
18
 
 
109
 
25
15
 
 
57
 
23
12
 
 
60
 
23
12
 
 
65
 
24
14
 
 
77
 
25
16
 
 
105
 
25
17
 
 
114
 
27
19
 
 
86
 
29
20
average max. and min. temperatures in °C
precipitation totals in mm
source: [7]
Brisbane
Climate chart (explanation)
JFMAMJJASOND
 
 
122
 
29
21
 
 
111
 
29
21
 
 
81
 
28
19
 
 
57
 
26
16
 
 
115
 
24
13
 
 
67
 
21
10
 
 
25
 
21
9
 
 
43
 
22
10
 
 
34
 
24
13
 
 
70
 
26
16
 
 
103
 
27
18
 
 
125
 
28
20
average max. and min. temperatures in °C
precipitation totals in mm
source: [8]

References

  1. ^ The Times Atlas of the World (1993). Times Books ISBN 0-7230-0492-7.
  2. ^ Climate in Azerbaijan [1].

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