diff --git a/esmvalcore/cmor/tables/custom/CMOR_rx1day.dat b/esmvalcore/cmor/tables/custom/CMOR_rx1day.dat
new file mode 100644
index 0000000000..84d5ce705c
--- /dev/null
+++ b/esmvalcore/cmor/tables/custom/CMOR_rx1day.dat
@@ -0,0 +1,21 @@
+SOURCE: CMIP5
+!============
+variable_entry:    rx1day
+!============
+modeling_realm:    atmos
+!----------------------------------
+! Variable attributes:
+!----------------------------------
+standard_name:
+units:             mm
+cell_methods:      time: mean
+cell_measures:     area: areacella
+long_name:         Annual/monthly maximum 1-day precipitation
+comment:           ETCCDI (Extreme climate change index) annual/monthly maximum 1-day precipitation
+!----------------------------------
+! Additional variable information:
+!----------------------------------
+dimensions:        longitude latitude time
+type:              real
+!----------------------------------
+!
\ No newline at end of file
diff --git a/esmvalcore/cmor/tables/custom/CMOR_rx5day.dat b/esmvalcore/cmor/tables/custom/CMOR_rx5day.dat
new file mode 100644
index 0000000000..24f0f510bc
--- /dev/null
+++ b/esmvalcore/cmor/tables/custom/CMOR_rx5day.dat
@@ -0,0 +1,21 @@
+SOURCE: CMIP5
+!============
+variable_entry:    rx5day
+!============
+modeling_realm:    atmos
+!----------------------------------
+! Variable attributes:
+!----------------------------------
+standard_name:
+units:             mm
+cell_methods:      time: mean
+cell_measures:     area: areacella
+long_name:         Annual/monthly maximum 5-day precipitation
+comment:           ETCCDI (Extreme climate change index) annual/monthly maximum 5-day precipitation
+!----------------------------------
+! Additional variable information:
+!----------------------------------
+dimensions:        longitude latitude time
+type:              real
+!----------------------------------
+!
\ No newline at end of file
diff --git a/esmvalcore/cmor/tables/custom/CMOR_tnn.dat b/esmvalcore/cmor/tables/custom/CMOR_tnn.dat
new file mode 100644
index 0000000000..2f598fd320
--- /dev/null
+++ b/esmvalcore/cmor/tables/custom/CMOR_tnn.dat
@@ -0,0 +1,21 @@
+SOURCE: CMIP5
+!============
+variable_entry:    tnn
+!============
+modeling_realm:    atmos
+!----------------------------------
+! Variable attributes:
+!----------------------------------
+standard_name:
+units:             K
+cell_methods:      time: mean
+cell_measures:     area: areacella
+long_name:         Annual/monthly minimum value of daily minimum temperature
+comment:           ETCCDI (Extreme climate change index) annual/monthly minimum value of daily minimum temperature
+!----------------------------------
+! Additional variable information:
+!----------------------------------
+dimensions:        longitude latitude time
+type:              real
+!----------------------------------
+!
\ No newline at end of file
diff --git a/esmvalcore/cmor/tables/custom/CMOR_txx.dat b/esmvalcore/cmor/tables/custom/CMOR_txx.dat
new file mode 100644
index 0000000000..53c68bb84d
--- /dev/null
+++ b/esmvalcore/cmor/tables/custom/CMOR_txx.dat
@@ -0,0 +1,21 @@
+SOURCE: CMIP5
+!============
+variable_entry:    txx
+!============
+modeling_realm:    atmos
+!----------------------------------
+! Variable attributes:
+!----------------------------------
+standard_name:
+units:             K
+cell_methods:      time: mean
+cell_measures:     area: areacella
+long_name:         Annual/monthly maximum value of daily maximum temperature
+comment:           ETCCDI (Extreme climate change index) annual/monthly maximum value of daily maximum temperature
+!----------------------------------
+! Additional variable information:
+!----------------------------------
+dimensions:        longitude latitude time
+type:              real
+!----------------------------------
+!
\ No newline at end of file