butackle

sed 's/.. / /' monthly_typhoon | sm2 1 1 2 2 | paste - <(tail -n +2 landing.csv ) | sed 's/,$/,0/' | tr , ' ' | awk '$1!=$3 || $2!=$NF

sed 1d landing.csv | awk -F, '{for(i=1;i<=12;i++){a[i]+=$(i+1)}}END{for(k in a){print k"  " a[k]"/"NR"="a[k]/NR }}' | sort -n

sed 1d landing.csv | awk -F, '{for(i=1;i<=12;i++){if(i==1 || $i != ""){printf $i;if(i>1){printf ":";print $i;break}}}}'

awk -F, '{for(i=2;i<=13;i++){if($i>0){print $1,i; next}}}' landing.csv

cat monthly_typhoon | grep -v ' 0$' | less | guniq -w4 | sed 's/....//' | awk '{print $1}'  | sort  | uniq -c