Daily air temperature variation in Makurdi metropolis using analysis of variance model

Abstract

This paper revealed the variations observed in the daily air temperature in Makurdi Metropolis, Benue State, Nigeria. The data used here is a 37years (1984-2021) on daily air temperature sourced from National Aeronautics and Space Administration (NASA). Two way Analysis of Variance (ANOVA) model was used and the results revealed that both months, years and interaction were all significance (0.000 < 0.05). This means that the daily air temperature of Makurdi metropolis are statistically significance across the Months (January – December) and the Years as well as the interaction between them. It was observed that month of March has the highest mean value of daily air temperature of 28.11 0C whereas December has the least mean value of 23.65 0C (Figure 1). Furthermore, 1984 has the least mean air temperature and 2021 has the highest though stochasticity is observed (Figure 2). The multiple means comparison was carried out using Turkey Honestly Significant Difference (HSD). The multiple means comparison for the months revealed ten (10) different subsets with July and September in subset 4, September and November in subset 5 shows no significant difference. Significance differences were observed with comparison across different subsets. For example, December and January are significantly different from each other (subset 1 and subset 2) and so on. The HSD result of the year shows eighteen (18) different subsets with 2021 significantly differ from any other year (subset 18 and any other subset), 2019 in subset 17 differ significantly from any other year exception of 2014 in the same subset.