# Homogeneity and Trend Analysis of Climatic Variables in Cap-Bon Region of Tunisia
## 3 Results and Discussion
### Homogeneity Analysis of Air Temperature and Precipitation Data
\begin{table}
\begin{tabular}{l c c c c c c c c c c c c} \hline \hline  & \multicolumn{4}{c}{**Tmax**} & \multicolumn{4}{c}{**Tmin**} & \multicolumn{4}{c}{**P**} \\ \cline{2-13}  & \multicolumn{2}{c}{**Petitt**} & \multicolumn{2}{c}{**SNHT**} & \multicolumn{2}{c}{**Petttitt**} & \multicolumn{2}{c}{**SNHT**} & \multicolumn{2}{c}{**Petttitt**} & \multicolumn{2}{c}{**SNHT**} \\ \cline{2-13}  & \multicolumn{2}{c}{**Break**} & \multicolumn{1}{c}{\(p\)-Value**} & \multicolumn{1}{c}{\(p\)-Value} & \multicolumn{1}{c}{\(p\)-Value} & \multicolumn{1}{c}{\(p\)-Value} & \multicolumn{1}{c}{\(p\)-Value} & \multicolumn{1}{c}{\(p\)-Value} & \multicolumn{1}{c}{\(p\)-Value} & \multicolumn{1}{c}{\(p\)-Value} & \multicolumn{1}{c}{\(p\)-Value} \\  & \multicolumn{1}{c}{**Year**} & \multicolumn{1}{c}{**\(p\)-Value**} & \multicolumn{1}{c}{**Year**} & \multicolumn{1}{c}{**Year**} & \multicolumn{1}{c}{**Year**} & \multicolumn{1}{c}{**Year**} & \multicolumn{1}{c}{**Year**} & \multicolumn{1}{c}{**Year**} & \multicolumn{1}{c}{**Year**} & \multicolumn{1}{c}{**Year**} & \multicolumn{1}{c}{**Year**} & \multicolumn{1}{c}{**Year**} \\ \hline Annual & 2000 & **\textless{}0.0001** & 2000 & **\textless{}0.0001** & 1992 & 0.439 & 1987 & 0.1184 & 2011 & 0.141 & 2014 & 0.0696 \\ Winter & 2006 & 0.3587 & 2006 & 0.3796 & 1992 & 0.6604 & 2019 & 0.71 & 2009 & 0.1620 & 2009 & 0.1408 \\ Spring & 1999 & **\textless{}0.0001** & 1999 & **\textless{}0.0001** & 1993 & 0.1157 & 1987 & **0.0065** & 2002 & 0.6331 & 2015 & 0.3339 \\ Summer & 2001 & **\textless{}0.0001** & 2001 & **\textless{}0.0001** & 1992 & 0.1814 & 2019 & 0.4622 & 2011 & 0.6197 & 2007 & 0.5125 \\ Autumn & 1998 & **\textless{}0.0003536** & 1998 & **\textless{}0.0001** & 2001 & 0.746 & 2003 & 0.5688 & 2011 & 0.6604 & 2012 & 0.4998 \\ January & 2006 & 0.101 & 2006 & 0.1968 & 1993 & 0.3075 & 1993 & 0.4011 & 2007 & 0.4179 & 1984 & 0.2497 \\ February & 1994 & 1 & 2019 & 0.2884 & 2002 & 0.7169 & 2002 & 0.8094 & 2002 & 0.7313 & 1984 & 0.8367 \\ March & 1999 & **\textless{}0.0019** & 1999 & **\textless{}0.0011** & 1987 & 0.1503 & 1987 & **0.0357** & 2015 & 0.6467 & 2015 & 0.6572 \\ April & 1999 & **\textless{}0.0001** & 2005 & **\textless{}0.0001** & 1992 & **0.0453** & 1992 & **0.0403** & 2013 & 0.3975 & 2019 & 0.5739 \\ May & 1998 & **\textless{}0.0001** & 2004 & **\textless{}0.0001** & 1992 & 0.2894 & 1992 & 0.2387 & 2011 & 0.8523 & 2011 & 0.8789 \\ June & 2001 & **\textless{}0.0001** & 2001 & **\textless{}0.0001** & 1992 & 0.2444 & 1992 & 0.2972 & 2007 & 0.4608 & 2007 & 0.7036 \\ July & 2002 & **\textless{}0.0001** & 2002 & **\textless{}0.0001** & 1993 & 0.1929 & 0.1424 & 0.2985 & 1985 & 0.6883 & 2006 & 0.8874 \\ August & 2002 & **\textless{}0.0001** & 2002 & **\textless{}0.0001** & 2003 & 0.746 & 2016 & 0.7038 & 1994 & 0.746 & 1988 & 0.6454 \\ September & 2006 & **\textless{}0.0003** & 2006 & **\textless{}0.0001** & 2001 & 0.101 & 201 & 0.215 & 1994 & 0.2174 & 0.7795 \\ October & 2000 & **\textless{}0.0002** & 1998 & **\textless{}0.0007** & 2006 & 0.9644 & 1985 & 0.8129 & 1984 & 1 & 1982 & 0.6582 \\ November & 1999 & **\textless{}0.0281** & 2007 & **0.0194** & 2003 & 0.6883 & 2003 & 0.9026 & 205 & 0.1321 & 2005 & 0.3999 \\ December & 1992 & 0.5305 & 1984 & 0.4622 & 1991 & 0.6883 & 1991 & 0.6854 & 2007 & **0.0184** & 2007 & **0.0477** \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Results of Pettitt and SNHT homogeneity tests. However, for the monthly precipitation series, the Pettitt test and the SNHT revealed the existence of a significant downward breakpoint in December (Figure 3). Figure 2: Results of homogeneity test applied on annual and seasonal precipitation time series (mu is the average of observed data). Before and after the break point, the monthly mean precipitation values were 68.74 and 21.7 mm, respectively.