Nazifi Umar Alaramma,
This year, 2021, had experienced a late onset of rainfall in Kano and surrounding. Therefore, the onset of rain in Kano and surrounding was computed to be five days with 83 millimetres of rain fall.
83mm is equivalent to 9.2% of the mean annual rainfall of Kano state. However, the duration of the rainy season in Kano is between mid-May to early October. Nevertheless, the rain may delay until June. This means the rainy season could not begin before mid-May in Kano and surrounding. Likewise, it will not extend to November.
As per the climate of Kano, the region falls within 100 rainy days in West Africa. Therefore, rain may fall earliest in mid-May, never before. However, it could delay up to July.
In 2021 the rain had delayed to very late June due to natural and anthropogenic factors. The natural characteristics are the routine of delay rainy seasons that happen to entire Sudano-Sahelian environments, some every five years, like parts of Mali and Ethiopia and some for many years like Kano in Nigeria.
This year could have followed the suit of those who predate it to bring rainy season late. However, it is significant to note that delaying the rainy season and frequency of drought in Kano and surrounding had reduced following the construction of Tiga, Challawa and other more than 30 dams in the state. These dams increased the recharging of clouds. Hence, no frequent drought in Kano and surrounding since the 1970s. However, a delay of the rainy season has not been totally hampered yet.
The human factor in delaying the rainy season this year may be human-induced climate change. We believe it originates from outside Nigeria. It is linked to the general circulation of the atmosphere, which alters Africa’s condition even if the major polluters are from Europe, America, and Asia.
Nazifi Alaramma is a lecturer at the Department of Geography Yusuf Maitama Sule University, Kano. He can be reached via firstname.lastname@example.org or email@example.com.