diff --git a/definitions/grib2/cfVarName.def b/definitions/grib2/cfVarName.def
index 2c04c8507..97814a304 100644
--- a/definitions/grib2/cfVarName.def
+++ b/definitions/grib2/cfVarName.def
@@ -1409,6 +1409,18 @@
 	 parameterCategory = 1 ;
 	 parameterNumber = 23 ;
 	}
+#Universal thermal climate index
+'utci' = {
+	 discipline = 20 ;
+	 parameterCategory = 0 ;
+	 parameterNumber = 0 ;
+	}
+#Mean radiant temperature
+'mrt' = {
+	 discipline = 20 ;
+	 parameterCategory = 0 ;
+	 parameterNumber = 1 ;
+	}
 #Virtual temperature
 'vtmp' = {
 	 discipline = 0 ;
diff --git a/definitions/grib2/name.def b/definitions/grib2/name.def
index 1a40636d4..92b1e36f6 100644
--- a/definitions/grib2/name.def
+++ b/definitions/grib2/name.def
@@ -1409,6 +1409,18 @@
 	 parameterCategory = 1 ;
 	 parameterNumber = 23 ;
 	}
+#Universal thermal climate index
+'Universal thermal climate index' = {
+	 discipline = 20 ;
+	 parameterCategory = 0 ;
+	 parameterNumber = 0 ;
+	}
+#Mean radiant temperature
+'Mean radiant temperature' = {
+	 discipline = 20 ;
+	 parameterCategory = 0 ;
+	 parameterNumber = 1 ;
+	}
 #Virtual temperature
 'Virtual temperature' = {
 	 discipline = 0 ;
diff --git a/definitions/grib2/paramId.def b/definitions/grib2/paramId.def
index aa61bee1f..46cb35b69 100644
--- a/definitions/grib2/paramId.def
+++ b/definitions/grib2/paramId.def
@@ -1409,6 +1409,18 @@
 	 parameterCategory = 1 ;
 	 parameterNumber = 23 ;
 	}
+#Universal thermal climate index
+'261001' = {
+	 discipline = 20 ;
+	 parameterCategory = 0 ;
+	 parameterNumber = 0 ;
+	}
+#Mean radiant temperature
+'261002' = {
+	 discipline = 20 ;
+	 parameterCategory = 0 ;
+	 parameterNumber = 1 ;
+	}
 #Virtual temperature
 '300012' = {
 	 discipline = 0 ;
diff --git a/definitions/grib2/shortName.def b/definitions/grib2/shortName.def
index b5f18764a..b7531089f 100644
--- a/definitions/grib2/shortName.def
+++ b/definitions/grib2/shortName.def
@@ -1409,6 +1409,18 @@
 	 parameterCategory = 1 ;
 	 parameterNumber = 23 ;
 	}
+#Universal thermal climate index
+'utci' = {
+	 discipline = 20 ;
+	 parameterCategory = 0 ;
+	 parameterNumber = 0 ;
+	}
+#Mean radiant temperature
+'mrt' = {
+	 discipline = 20 ;
+	 parameterCategory = 0 ;
+	 parameterNumber = 1 ;
+	}
 #Virtual temperature
 'vtmp' = {
 	 discipline = 0 ;
diff --git a/definitions/grib2/units.def b/definitions/grib2/units.def
index 9c40e8d67..9b975528e 100644
--- a/definitions/grib2/units.def
+++ b/definitions/grib2/units.def
@@ -1409,6 +1409,18 @@
 	 parameterCategory = 1 ;
 	 parameterNumber = 23 ;
 	}
+#Universal thermal climate index
+'K' = {
+	 discipline = 20 ;
+	 parameterCategory = 0 ;
+	 parameterNumber = 0 ;
+	}
+#Mean radiant temperature
+'K' = {
+	 discipline = 20 ;
+	 parameterCategory = 0 ;
+	 parameterNumber = 1 ;
+	}
 #Virtual temperature
 'K' = {
 	 discipline = 0 ;