Relation between some metrological parameters in Ilorin, North Central Nigeria

Abstract

Relative humidity, temperature and atmospheric pressure measurements at Ilorin in North central Nigeria (Latitude 08.29^oN and Longitude 04.32^oE) for year 2004 were carried out and analyzed in terms of their diurnal variability with respect to the highest mean and lowest values of the parameters. The data were collected at a minute interval each day throughout the year under study. The result obtained showed the highest temperature, relative humidity and pressure of the year to be 39.28^oc day 137, 108.7% day 300, and 979mm Hg day 155 respectively while the lowest values are 12.41^oc day 22, 6.73% day 283 and 963mm Hg day 87 for temperature, relative humidity and pressure respectively. The diurnal plots showed a significant fluctuation from the beginning of the year to the 55th day of the year and an obvious pattern to the end of the year for the three parameters under study. The highest temperature occurs on may 17th, which marks the dry season while the highest relative humidity and pressure occurs on October 27th and June 4th respectively which are days within the rainy months. The lowest temperature was noticed on January 22nd this falls within the harmattan months while the lowest relative humidity and pressure were noticed on October 10th and March 28th which are months in the rainy and dry season respectively.

Keywords: Relative humidity, variability, temperature and pressure