Global Journal of Science Frontier Research, H: Environment & Earth Science, Volume 21 Issue 6

Source: Author’s computation, 2021. Fig. 3: Trend chart of mean rainfall in the study area The town always experience this trend of downpour following probably its location at the tropics. Where is usually relatively unstable and high. Influenced by its tropical temperature (Akwa et’ al 2007). And lastly, its unstableness and variations could be traced to the phenomenon of climate change experienced over the years (Ayoade, 2004). Logging of trees increases the effect of drought thereby, impacting patterns of precipitation. iv. Relative Humidity Figure 4 depicts the trend of relative humidity in the study area. From the trend plot it can be observed that the trend line is upward sloping in nature, indicating an increasing trend in the mean value of relative humidity in the study area between 2003 and 2018. From the trend chart, it can be observed that there is a steady and gradual increasing trend between 2003 and 2009. During these periods the relative humidity recorded in the study area were 34.8% in 2003, 38.3% in 2004, 37.8% in 2005, 37.5% in 2006, 38% in 2007, 37.6% in 2008, and 39.4% in 2009. In the year 2010 and 2011, a slight decline of mean relative humidity was recorded in the study area. During these periods, relative humidity recorded were 37.1% and 36.3% respectively; while a slight increase was recorded in the 2012, which was 39.6%. A noticeable decline in relative humidity in the study area was recorded in the year 2013 as depicted by the downward movement of the trend plot. During this period, the mean relative humidity recorded in the study area was 36.2%. Most vivid from the trend chart as depicted in Figure 4.4 is the sharp upward movement of the trend line. This movement signifies a significant increase in the relative humidity in the study area. This increase was recorded in the year 2014. In this year (2014) relative humidity recorded in the study area was 60.5%. However, a slight decline in relative humidity was recorded in the year 2015, which was 59.7%. Besides the decline recorded in the year 2015, the year 2016 to 2018 recorded a much higher percentage in relative humidity in the study area. During these periods (2016 to 2018) relative humidity recorded were; 62% in 2016, 61.5% in 2017, and 60% in 2018. The trend equation indicates a goodness of fit in the trend plot, while the value of r 2 (0.6573) suggest a 66% variation in relative humidity in the study area between 2003 and 2018. This work conform with the studies of Ahmad (2020). y = 4.723x - 9440. R² = 0.602 0 20 40 60 80 100 120 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 Mean Rainfall (mm) Year(s) Mean Rainfall Linear (Mean Rainfall) Relationship between Climatic Variables and Incidence of Malaria and Asthma in Keffi Local Government Area of Nasarawa State, Nigeria © 2021 Global Journals 1 Global Journal of Science Frontier Research Volume XXI Issue VI Year 2021 58 ( H ) Version I