Worldwide zones of tropical monsoon climate (Am).

An area of tropical monsoon climate (occasionally known as a sub-equatorial, tropical wet climate or a tropical monsoon and trade-wind littoral climate) is a tropical climate sub-type that corresponds to the Köppen climate classification category Am. Tropical monsoon climates have monthly mean temperatures above 18 °C (64 °F) in every month of the year and a dry season.[1]: 200–1  Tropical monsoon climates is the intermediate climate between the wet Af (or tropical rainforest climate) and the drier Aw (or tropical savanna climate).

A tropical monsoon climate's driest month has on average less than 60 mm, but more than ${\textstyle 100-\left({\frac {Total\ Annual\ Precipitation\ (mm)}{25))\right)}$.[1] This is in direct contrast to a tropical savanna climate, whose driest month has less than 60 mm of precipitation and also less than ${\textstyle 100-\left({\frac {Total\ Annual\ Precipitation\ (mm)}{25))\right)}$ of average monthly precipitation. In essence, a tropical monsoon climate tends to either have more rainfall than a tropical savanna climate or have less pronounced dry seasons. A tropical monsoon climate tends to vary less in temperature during a year than does a tropical savanna climate. This climate has a driest month which nearly always occurs at or soon after the winter solstice.[1]

Versions

There are generally two versions of a tropical monsoon climate:

• Less pronounced dry seasons. Regions with this variation of the tropical monsoon climate typically see copious amounts of rain during the wet season(s), usually in the form of frequent thunderstorms. Unlike most tropical savanna climates, a sizeable amount of precipitation also falls during the dry season(s). In essence, this version of the tropical monsoon climate generally has less pronounced dry seasons than tropical savanna climates.
• Extraordinarily rainy wet seasons and pronounced dry seasons. This variation features pronounced dry seasons similar in length and character to dry seasons observed in tropical savanna climates. This is followed by a sustained period (or sustained periods) of extraordinary rainfall. In some instances, up to (and sometimes in excess of) 1,000 mm of precipitation is observed per month for two or more consecutive months. Tropical savanna climates generally do not see this level of sustained rainfall.

Distribution

Tropical monsoon are most commonly found in Africa (West and Central Africa), Asia (South and Southeast Asia), central of South America and Central America. This climate also occurs in sections of the Caribbean, North America, and northern Australia.

Factors

The major controlling factor over a tropical monsoon climate is its relationship to the monsoon circulation. The monsoon is a seasonal change in wind direction. In Asia, during the summer (or high-sun season) there is an onshore flow of air (air moving from ocean toward land). In the “winter” (or low-sun season) an offshore air flow (air moving from land toward water) is prevalent. The change in direction is due to the difference in the way water and land heat.

Changing pressure patterns that affect the seasonality of precipitation also occur in Africa though it generally differs from the way it operates in Asia. During the high-sun season, the Intertropical convergence zone (ITCZ) induces rain. During the low-sun season, the subtropical high creates dry conditions. The monsoon climates of Africa, and the Americas for that matter, are typically located along tradewind coasts.

Cities

Select charts

Chittagong
Climate chart (explanation)
 J F M A M J J A S O N D 5     27 15 28     30 19 64     35 24 150     39 26 264     35 24 533     34 25 597     38 26 518     33 24 320     33 24 180     32 23 56     32 17 15     24 14 Average max. and min. temperatures in °C Precipitation totals in mm Source: BBC[2]
Imperial conversion
JFMAMJJASOND

0.2

81
59

1.1

86
66

2.5

95
75

5.9

102
79

10

95
75

21

93
77

24

100
79

20

91
75

13

91
75

7.1

90
73

2.2

90
63

0.6

75
57
Average max. and min. temperatures in °F
Precipitation totals in inches
Conakry
Climate chart (explanation)
 J F M A M J J A S O N D 1     32 19 1     33 20 3     33 21 22     34 22 137     33 21 396     32 20 1130     30 20 1104     30 21 617     31 21 295     31 20 70     32 21 8     32 20 Average max. and min. temperatures in °C Precipitation totals in mm Source: HK[3]
Imperial conversion
JFMAMJJASOND

0

90
66

0

92
68

0.1

92
70

0.9

92
72

5.4

92
69

16

89
68

44

86
69

43

86
69

24

87
69

12

88
69

2.8

90
70

0.3

90
68
Average max. and min. temperatures in °F
Precipitation totals in inches
Miami
Climate chart (explanation)
 J F M A M J J A S O N D 51     24 15 53     25 16 61     26 18 72     28 20 158     30 22 237     31 24 145     32 25 193     32 25 194     31 24 143     29 22 68     27 19 47     25 16 Average max. and min. temperatures in °C Precipitation totals in mm Source: WMO[4]
Imperial conversion
JFMAMJJASOND

2

75
59

2.1

76
60

2.4

79
64

2.9

82
68

6.2

85
72

9.3

88
75

5.7

89
76

7.6

89
77

7.6

88
76

5.6

85
72

2.7

80
67

1.8

77
62
Average max. and min. temperatures in °F
Precipitation totals in inches