Editing Geography of Chad (section)

===Sahelian region===
The semiarid sahelian zone, or Sahel, forms a belt about {{convert|500|km|mi|0|sp=us}} wide that runs from Lac and Chari-Baguirmi prefectures eastward through Guéra, Ouaddaï, and northern Salamat prefectures to the Sudanese frontier.<ref name=":0" /> The climate in this transition zone between the desert and the southern sudanian zone is divided into a rainy season (from June to September) and a dry period (from October to May).<ref name=":0" />

In the northern Sahel, thorny shrubs and acacia trees grow wild, while date palms, cereals, and garden crops are raised in scattered oases.<ref name=":0" /> Outside these settlements, nomads tend their flocks during the rainy season, moving southward as forage and surface water disappear with the onset of the dry part of the year.<ref name=":0" /> The central Sahel is characterized by drought-resistant grasses and small woods.<ref name=":0" /> Rainfall is more abundant there than in the Saharan region.<ref name=":0" /> For example, N'Djamena records a maximum annual average rainfall of {{convert|580|mm|in|1|sp=us}}, while Ouaddaï Prefecture receives just a bit less.<ref name=":0" />

During the hot season, in April and May, maximum temperatures frequently rise above {{convert|40|°C}}.<ref name=":0" /> In the southern part of the Sahel, rainfall is sufficient to permit crop production on unirrigated land, and millet and sorghum are grown.<ref name=":0" /> Agriculture is also common in the marshlands east of Lake Chad and near swamps or wells.<ref name=":0" /> Many farmers in the region combine subsistence agriculture with the raising of cattle, sheep, goats, and poultry.<ref name=":0" />
{{Weather box
|location = N'Djamena (1961-1990, extremes 1904-present)
|metric first= Y
|single line= Y
|width = auto
|Jan record high C = 41.8
|Feb record high C = 47.6
|Mar record high C = 46.5
|Apr record high C = 48.3
|May record high C = 49.1
|Jun record high C = 44.0
|Jul record high C = 46.0
|Aug record high C = 38.6
|Sep record high C = 40.5
|Oct record high C = 43.6
|Nov record high C = 47.5
|Dec record high C = 40.5
|year record high C = 49.1
|Jan high C = 32.4
|Feb high C = 35.2
|Mar high C = 38.7
|Apr high C = 41.0
|May high C = 39.9
|Jun high C = 37.2
|Jul high C = 33.5
|Aug high C = 31.6
|Sep high C = 33.7
|Oct high C = 36.9
|Nov high C = 35.8
|Dec high C = 33.5

| Jan mean C = 23.4
| Feb mean C = 25.9
| Mar mean C = 29.9
| Apr mean C = 32.9
| May mean C = 32.9
| Jun mean C = 30.9
| Jul mean C = 28.3
| Aug mean C = 27.0
| Sep mean C = 28.2
| Oct mean C = 29.4
| Nov mean C = 26.8
| Dec mean C = 24.2
|year mean C = 
|Jan low C = 14.3
|Feb low C = 16.6
|Mar low C = 21.0
|Apr low C = 24.8
|May low C = 25.8
|Jun low C = 24.7
|Jul low C = 23.1
|Aug low C = 22.4
|Sep low C = 22.7
|Oct low C = 21.8
|Nov low C = 17.8
|Dec low C = 14.8
|year high C= 35.8 |year low C= 20.8
|year high F =96.4 |year low F =69.5<!--rounds down-->
|Jan record low C = 6.5
|Feb record low C = 8.0
|Mar record low C = 11.3
|Apr record low C = 16.2
|May record low C = 16.8
|Jun record low C = 18.2
|Jul record low C = 17.7
|Aug record low C = 18.5
|Sep record low C = 15.1
|Oct record low C = 13.5
|Nov record low C = 10.3
|Dec record low C = 8.4
|year record low C = 6.5
|rain colour = green
|Jan rain mm = 0.0
|Feb rain mm = 0.0
|Mar rain mm = 0.3
|Apr rain mm = 10.3
|May rain mm = 25.8
|Jun rain mm = 51.0
|Jul rain mm = 143.8
|Aug rain mm = 174.4
|Sep rain mm = 84.3
|Oct rain mm = 20.3
|Nov rain mm = 0.1
|Dec rain mm = 0.0
|year rain mm = 
|Jan humidity = 29
|Feb humidity = 23
|Mar humidity = 21
|Apr humidity = 28
|May humidity = 39
|Jun humidity = 52
|Jul humidity = 68
|Aug humidity = 76
|Sep humidity = 72
|Oct humidity = 49
|Nov humidity = 33
|Dec humidity = 31
|year humidity = 43
|unit rain days = 0.1 mm
|Jan rain days = 0
|Feb rain days = 0
|Mar rain days = 1
|Apr rain days = 3
|May rain days = 6
|Jun rain days = 9
|Jul rain days = 13
|Aug rain days = 15
|Sep rain days = 9
|Oct rain days = 3
|Nov rain days = 1
|Dec rain days = 0
|Jan sun = 297.6
|Feb sun = 277.2
|Mar sun = 282.1
|Apr sun = 273.0
|May sun = 285.2
|Jun sun = 258.0
|Jul sun = 213.9
|Aug sun = 201.5
|Sep sun = 228.0
|Oct sun = 285.2
|Nov sun = 300.0
|Dec sun = 303.8
|year sun = 3205.5
|Jand sun = 9.6
|Febd sun = 9.9
|Mard sun = 9.1
|Aprd sun = 9.1
|Mayd sun = 9.2
|Jund sun = 8.6
|Juld sun = 6.9
|Augd sun = 6.5
|Sepd sun = 7.6
|Octd sun = 9.2
|Novd sun = 10.0
|Decd sun = 9.8
|yeard sun = 8.8
|source 1 = [[World Meteorological Organization]] (precipitation)<ref name= WMOndjamena>{{cite web
| url = http://worldweather.wmo.int/en/city.html?cityId=256
| title = World Weather Information Service–Ndjamena
| publisher = World Meteorological Organization
| access-date = October 19, 2015
| archive-url = https://web.archive.org/web/20160304073518/http://worldweather.wmo.int/en/city.html?cityId=256
| archive-date = March 4, 2016
| url-status = dead
}}</ref>
|source 2 = NOAA (sun, humidity, temperatures),<ref name= NOAANdjamena>{{cite web
| url = https://www.ncei.noaa.gov/pub/data/normals/WMO/1961-1990/RA-I/TE/64700.TXT
| title = ND'Jamena Climate Normals 1961–1990
| publisher = [[National Oceanic and Atmospheric Administration]]
| access-date = October 19, 2015}}</ref> Meteo Climat (record highs and lows)<ref name = meteoclimatnjadema>
{{cite web 
| url = http://meteo-climat-bzh.dyndns.org/index.php?page=stati&id=1876
| title = Station N'Djamena
| publisher = Meteo Climat 
|language = fr 
| access-date = October 19, 2016}}</ref>
|date=September 2011}}