Semi-arid climate

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Regions with semi-arid climates
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BSh
BSk BS climate.png
Regions with semi-arid climates
   BSh
   BSk

A semi-arid climate, semi-desert climate, or steppe climate is a dry climate sub-type. It is located on regions that receive precipitation below potential evapotranspiration, but not as low as a desert climate. There are different kinds of semi-arid climates, depending on variables such as temperature, and they give rise to different biomes.

Contents

Defining attributes of semi-arid climates

A more precise definition is given by the Köppen climate classification, which treats steppe climates (BSh and BSk) as intermediates between desert climates (BW) and humid climates (A, C, D) in ecological characteristics and agricultural potential. Semi-arid climates tend to support short, thorny or scrubby vegetation and are usually dominated by either grasses or shrubs as they usually cannot support forests.

Sahel region of Mali Les Falaises de Bandiagara.jpg
Sahel region of Mali

To determine if a location has a semi-arid climate, the precipitation threshold must first be determined. The method used to find the precipitation threshold (in millimeters):

If the area's annual precipitation in millimeters is less than the threshold but more than half or 50% the threshold, it is classified as a BS (steppe, semi-desert, or semi-arid climate). [1]

Furthermore, to delineate hot semi-arid climates from cold semi-arid climates, a mean annual temperature of 18 °C (64.4 °F) is used as an isotherm. A location with a BS-type climate is classified as hot semi-arid (BSh) if its mean temperature is above this isotherm, and cold semi-arid (BSk) if not.

Hot semi-arid climates

Regions with hot semi-arid climates Koppen-Geiger Map BSh present.svg
Regions with hot semi-arid climates
Semi-arid climate in Queensland, Australia. Mitchell grass downs post rain Boulia Shire Queensland P1070007.jpg
Semi-arid climate in Queensland, Australia.

Hot semi-arid climates (type "BSh") tend to be located from the high teens to mid-30s latitudes of the tropics and subtropics, typically in proximity to regions with a tropical savanna climate or a humid subtropical climate. These climates tend to have hot, or sometimes extremely hot, summers and warm to cool winters, with some to minimal precipitation. Hot semi-arid climates are most commonly found around the fringes of subtropical deserts.

Hot semi-arid climates are most commonly found in Africa, Australia, and South Asia. In Australia, a large portion of the Outback surrounding the central desert regions lies within the hot semi-arid climate region. [2] [ clarification needed ] In South Asia, both India and parts of Pakistan experience the seasonal effects of monsoons and feature short but well-defined wet seasons, but are not sufficiently wet overall to qualify as either a tropical savanna or a humid subtropical climate.

Hot semi-arid climates can be also found in parts of North America, such as most of northern Mexico, the ABC Islands, the rain shadows of Hispaniola's mountain ranges in the Dominican Republic and Haiti, parts of the Southwestern United States, and sections of South America such as the sertão , the Gran Chaco, and the poleward side of the arid deserts, where they typically feature a Mediterranean precipitation pattern, with generally rainless summers and wetter winters. They are also found in few areas of Europe surrounding the Mediterranean Basin. In Europe, BSh climates are primarily found in southeastern Spain. [3] [4] It can also be found on some parts of south Greece, [5] [6] and marginal areas of Italy in Sicily, Sardinia and Lampedusa.

Cold semi-arid climates

Regions with cold semi-arid climates Koppen-Geiger Map BSk present.svg
Regions with cold semi-arid climates
Semi-arid climate in Montana, USA. Hell Creek State Park.jpg
Semi-arid climate in Montana, USA.

Cold semi-arid climates (type "BSk") tend to be located in elevated portions of temperate zones generally from the mid-30s to low 50s latitudes, typically bordering a humid continental climate or a Mediterranean climate. They are also typically found in continental interiors some distance from large bodies of water. Cold semi-arid climates usually feature warm to hot dry summers, though their summers are typically not quite as hot as those of hot semi-arid climates. Unlike hot semi-arid climates, areas with cold semi-arid climates tend to have cold and possibly freezing winters. These areas usually see some snowfall during the winter, though snowfall is much lower than at locations at similar latitudes with more humid climates.

Areas featuring cold semi-arid climates tend to have higher elevations than areas with hot semi-arid climates, and tend to feature major temperature swings between day and night, sometimes by as much as 20 °C (36 °F) or more. These large diurnal temperature variations are seldom seen in hot semi-arid climates. Cold semi-arid climates at higher latitudes tend to have dry winters and wetter summers, while cold semi-arid climates at lower latitudes tend to have precipitation patterns more akin to subtropical climates, with dry summers, relatively wet winters, and even wetter springs and autumns.

Cold semi-arid climates are most commonly found in East Asia, the Middle East, including other parts of Asia, and Western North America. However, they can also be found in Northern Africa, South Africa, Europe, sections of South America and sections of interior southern Australia (e.g. Kalgoorlie and Mildura) and southern New Zealand (Alexandra).

Charts of selected cities

Patos, Paraíba, Brazil
Climate chart (explanation)
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Average max. and min. temperatures in °C
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Source: [7]
Imperial conversion
JFMAMJJASOND
 
 
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Precipitation totals in inches
Kalgoorlie, Australia
Climate chart (explanation)
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21
 
 
19
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16
 
 
26
11
 
 
19
 
 
29
14
 
 
16
 
 
32
17
Average max. and min. temperatures in °C
Precipitation totals in mm
Source: [8]
Imperial conversion
JFMAMJJASOND
 
 
1.1
 
 
92
65
 
 
1.3
 
 
90
64
 
 
1
 
 
85
61
 
 
0.8
 
 
78
55
 
 
1
 
 
69
48
 
 
1.1
 
 
64
43
 
 
1
 
 
62
41
 
 
0.8
 
 
66
42
 
 
0.5
 
 
72
47
 
 
0.6
 
 
79
52
 
 
0.7
 
 
84
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0.6
 
 
90
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Average max. and min. temperatures in °F
Precipitation totals in inches
Jaipur (Sanganer), India
Climate chart (explanation)
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Average max. and min. temperatures in °C
Precipitation totals in mm
Source: India Weather On Web
Imperial conversion
JFMAMJJASOND
 
 
0.3
 
 
66
39
 
 
0.5
 
 
72
45
 
 
0.2
 
 
84
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93
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84
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Niamey, Niger
Climate chart (explanation)
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38
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36
20
 
 
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33
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Average max. and min. temperatures in °C
Precipitation totals in mm
Source: Deutscher Wetterdienst [9]
Imperial conversion
JFMAMJJASOND
 
 
0
 
 
91
61
 
 
0
 
 
96
66
 
 
0.2
 
 
102
73
 
 
0.2
 
 
106
80
 
 
1.4
 
 
104
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2.7
 
 
99
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6.1
 
 
93
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6.7
 
 
91
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3.6
 
 
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Average max. and min. temperatures in °F
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Murcia, Spain
Climate chart (explanation)
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Average max. and min. temperatures in °C
Precipitation totals in mm
Source: Agencia Estatal de Meteorología [10]
Imperial conversion
JFMAMJJASOND
 
 
1
 
 
62
40
 
 
1.1
 
 
65
43
 
 
1.2
 
 
70
46
 
 
1.1
 
 
74
49
 
 
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0.8
 
 
88
63
 
 
0.2
 
 
93
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94
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1.1
 
 
87
64
 
 
1.7
 
 
78
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1.3
 
 
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Average max. and min. temperatures in °F
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Reno, Nevada, United States
Climate chart (explanation)
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Average max. and min. temperatures in °C
Precipitation totals in mm
Source: NOAA [11]
Imperial conversion
JFMAMJJASOND
 
 
1
 
 
46
25
 
 
1
 
 
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29
 
 
0.8
 
 
58
33
 
 
0.5
 
 
64
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0.8
 
 
55
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46
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Average max. and min. temperatures in °F
Precipitation totals in inches

See also

Related Research Articles

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  8. Access on August 14, 2021.
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