diff --git a/esmvalcore/cmor/check.py b/esmvalcore/cmor/check.py
index 3e5a1c6f9c..6dbc0e6e4f 100644
--- a/esmvalcore/cmor/check.py
+++ b/esmvalcore/cmor/check.py
@@ -765,10 +765,10 @@ def _check_coord_points(self, coord_info, coord, var_name):
                 self._cube = self._cube.intersection(lon_extent)
             else:
                 new_lons = coord.core_points().copy()
-                self._set_range_in_0_360(new_lons)
+                new_lons = self._set_range_in_0_360(new_lons)
                 if coord.bounds is not None:
                     new_bounds = coord.bounds.copy()
-                    self._set_range_in_0_360(new_bounds)
+                    new_bounds = self._set_range_in_0_360(new_bounds)
                 else:
                     new_bounds = None
                 new_coord = coord.copy(new_lons, new_bounds)
@@ -796,10 +796,8 @@ def _check_longitude_min(self, coord, var_name):
 
     @staticmethod
     def _set_range_in_0_360(array):
-        while array.min() < 0:
-            array[array < 0] += 360
-        while array.max() > 360:
-            array[array > 360] -= 360
+        """Convert longitude coordinate to [0, 360]."""
+        return (array + 360.0) % 360.0
 
     def _check_requested_values(self, coord, coord_info, var_name):
         """Check requested values."""
diff --git a/tests/unit/cmor/test_cmor_check.py b/tests/unit/cmor/test_cmor_check.py
index 6935538e29..f3135558a2 100644
--- a/tests/unit/cmor/test_cmor_check.py
+++ b/tests/unit/cmor/test_cmor_check.py
@@ -13,8 +13,11 @@
 from cf_units import Unit
 
 from esmvalcore.cmor.check import (
-    CheckLevels, CMORCheck,
-    CMORCheckError, _get_cmor_checker)
+    CheckLevels,
+    CMORCheck,
+    CMORCheckError,
+    _get_cmor_checker,
+)
 
 
 class VariableInfoMock:
@@ -760,8 +763,7 @@ def test_non_decreasing_fix(self):
         cube_points = self.cube.coord('latitude').points
         reference = np.linspace(90, -90, 20, endpoint=True)
         for index in range(20):
-            self.assertTrue(
-                iris.util.approx_equal(cube_points[index], reference[index]))
+            np.testing.assert_allclose(cube_points[index], reference[index])
         # test bounds are contiguous
         bounds = self.cube.coord('latitude').bounds
         right_bounds = bounds[:-2, 1]
@@ -1113,6 +1115,21 @@ def test_hr_mip_cordex(self):
         assert checker(self.cube)._cmor_var.short_name == 'tas'
         assert checker(self.cube)._cmor_var.frequency == '3hr'
 
+    def test_set_range_in_0_360(self):
+        checker = _get_cmor_checker('CMIP5', 'Amon', 'tas', 'mon')
+        arr_in = np.array([[-120.0, 0.0, 20.0], [-1.0, 360.0, 400.0]])
+        arr_exp = np.array([[240.0, 0.0, 20.0], [359.0, 0.0, 40.0]])
+        arr_out = checker(self.cube)._set_range_in_0_360(arr_in)
+        np.testing.assert_allclose(arr_out, arr_exp)
+
+    def test_set_range_in_0_360_lazy(self):
+        checker = _get_cmor_checker('CMIP5', 'Amon', 'tas', 'mon')
+        arr_in = da.from_array([[-120.0, 0.0, 20.0], [-1.0, 360.0, 400.0]])
+        arr_exp = da.from_array([[240.0, 0.0, 20.0], [359.0, 0.0, 40.0]])
+        arr_out = checker(self.cube)._set_range_in_0_360(arr_in)
+        self.assertTrue(isinstance(arr_out, da.core.Array))
+        np.testing.assert_allclose(arr_out.compute(), arr_exp.compute())
+
     def _check_fails_on_data(self):
         checker = CMORCheck(self.cube, self.var_info)
         checker.check_metadata()