diff --git a/mlair/helpers/mergetime_cdo_files.sh b/mlair/helpers/mergetime_cdo_files.sh
new file mode 100644
index 0000000000000000000000000000000000000000..91459be176de6e17273438df6d0fb9281557cbe7
--- /dev/null
+++ b/mlair/helpers/mergetime_cdo_files.sh
@@ -0,0 +1,59 @@
+#!/bin/sh
+
+# This scipt uses cdo mergetime to combine hourly files into two files per month
+# example file: wrfout_d01_2009-02-03_07:00:00.nc
+
+for i in "$@"; do
+  case $i in
+    -s=*|--startyear=*)
+      startyear="${i#*=}"
+      shift # past argument=value
+      ;;
+    -e=*|--endyear=*)
+      endyear="${i#*=}"
+      shift # past argument=value
+      ;;
+    -f=*|--filestarter=*)
+      filestarter="${i#*=}"
+      shift # past argument=value
+      ;;
+    -p=*|--datapath=*)
+      datapath="${i#*=}"
+      shift # past argument=value
+      ;;
+    -n=*|--newpath=*)
+      newpath="${i#*=}"
+      shift # past argument=value
+      ;;
+    --default)
+      DEFAULT=YES
+      shift # past argument with no value
+      ;;
+    *)
+      # unknown option
+      ;;
+  esac
+done
+
+# source mergetime_cdo_files.sh -s=2009 -e=2009 -f=wrfout_d01_
+# source mergetime_cdo_files.sh -s=2009 -e=2009 -f=wrfout_d01_ -p=hourly/ -n=monthly/
+
+for year in $(seq "$startyear" "$endyear")
+do
+  echo "$year"
+  for month in $(seq -w 1 12)
+  do
+    echo "##########################################"
+    echo "Processing: cdo mergetime ${datapath}${filestarter}${year}-${month}-[0-1][0-9]_??:??:??.nc ${newpath}${filestarter}${year}-${month}_first_part.nc &"
+    # cdo mergetime ${datapath}${filestarter}${year}-${month}-[0-1][0-9]_??:??:??.nc ${newpath}${filestarter}${year}-${month}_first_part.nc &
+    echo "Processing: cdo mergetime ${datapath}${filestarter}${year}-${month}-[2-3][0-9]_??:??:??.nc ${newpath}${filestarter}${year}-${month}_second_part.nc &"
+# cdo mergetime ${datapath}${filestarter}${year}-${month}-[2-3][0-9]_??:??:??.nc ${newpath}${filestarter}${year}-${month}_second_part.nc &
+  done
+done
+
+echo "############ YOUR OPTIONS ############"
+echo "startyear: $startyear"
+echo "endyear: $endyear"
+echo "filestarter: $filestarter"
+echo "datapath: $datapath"
+echo "newpath: $newpath"
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