weather.sh

time tar zxvf weather.tz -O 2>&1 | awk '{if(substr($2,0,4)>=1996){a=$1" "substr($2,0,7);split($3,max,":");split($4,min,":");arr[a]+=max[2]-min[2];num[a]+=1}}END{for(i in arr) print i,arr[i]/num[i]}'  | awk '{if(max[$1]<$3){max[$1]=$3;date[$1]=$2;} else if(max[$1]==$3){date[$1]=date[$1]" "$2}}END{for(i in max) print i,date[i],max[i]}' > res