Recent Changes of Some Observed Climate Extreme Events in Kano

Table 1

Summary of the temperature and rainfall indices used in the study: Tn and Tx are daily minimum and maximum temperature, respectively.

Element	Index	Descriptive name	Definition	Units
Rainfall	PRCPTOT	Annual total rainfall	Annual total PRCP in wet days (RR ≥ 1 mm)	Mm
Rainfall	RX5day	Maximum 5-day precipitation	Maximum 5-day precipitation	Mm
Rainfall	CWD	Consecutive wet days	Maximum number of consecutive wet days	Days
Rainfall	R99p	Extremely wet days	Annual total PRCP when RR >99th percentile	Mm
Tn	Tn10p	Cool night frequency	Percentage of days with TN <10th percentile of 1960–2007	%
Tn	Tn90p	Warm night frequency	Percentage of days with TN >90th percentile of 1960–2007	%
Tx	Tx10p	Cool day frequency	Percentage of days with TX <10th percentile of 1960–2007	%
Tx	Tx90p	Warm day frequency	Percentage of days with TX >90th percentile of 1960–2007	%
Tx	WSDI	Warm spells	Annual count of days with at least 6 consecutive days with TX >90th percentile of 1960–2007	Days