diff --git a/scripts/ancillary/fix_dailyclim_attrs.py b/scripts/ancillary/fix_dailyclim_attrs.py
new file mode 100644
index 00000000..fe20de1d
--- /dev/null
+++ b/scripts/ancillary/fix_dailyclim_attrs.py
@@ -0,0 +1,102 @@
+"""
+./fix_dailyclim_attrs.py
+
+Add global attributes to daily climatology files
+
+
+"""
+
+import os
+
+from netCDF4 import Dataset
+
+source_dir = "/share/apps/G02202_V5/v05_ancillary/"
+
+base_filename = {
+    "psn25": "G02202-ancillary-psn25-daily-invalid-ice-v05r00.nc",
+    "pss25": "G02202-ancillary-pss25-daily-invalid-ice-v05r00.nc",
+}
+
+new_global_attrs_for_gridid = {
+    "psn25": {
+        "title": "Day of year climatology invalid ice mask used in CDRv5",
+        "date_created": "2024-11-06",
+        "date_modified": "2024-11-06",
+        "date_metadata_modified": "2024-11-06",
+        "keywords": "EARTH SCIENCE SERVICES > DATA ANALYSIS AND VISUALIZATION > GEOGRAPHIC INFORMATION SYSTEMS",
+        "Conventions": "CF-1.10, ACDD-1.3",
+        "cdm_data_type": "grid",
+        "geospatial_bounds": "POLYGON ((-3850000 5850000, 3750000 5850000, 3750000 -5350000, -3850000 -5350000, -3850000 5850000))",
+        "geospatial_bounds_crs": "EPSG:3411",
+        "geospatial_x_units": "meters",
+        "geospatial_y_units": "meters",
+        "geospatial_x_resolution": "25000 meters",
+        "geospatial_y_resolution": "25000 meters",
+        "geospatial_lat_min": 30.980564,
+        "geospatial_lat_max": 90.0,
+        "geospatial_lon_min": -180.0,
+        "geospatial_lon_max": 180.0,
+        "geospatial_lat_units": "degrees_north",
+        "geospatial_lon_units": "degrees_east",
+    },
+    "pss25": {
+        "title": "Day of year climatology invalid ice mask used in CDRv5",
+        "date_created": "2024-11-06",
+        "date_modified": "2024-11-06",
+        "date_metadata_modified": "2024-11-06",
+        "keywords": "EARTH SCIENCE SERVICES > DATA ANALYSIS AND VISUALIZATION > GEOGRAPHIC INFORMATION SYSTEMS",
+        "Conventions": "CF-1.10, ACDD-1.3",
+        "cdm_data_type": "grid",
+        "geospatial_bounds": "POLYGON ((-3950000 4350000, 3950000 4350000, 3950000 -3950000, -3950000 -3950000, -3950000 4350000))",
+        "geospatial_bounds_crs": "EPSG:3412",
+        "geospatial_x_units": "meters",
+        "geospatial_y_units": "meters",
+        "geospatial_x_resolution": "25000 meters",
+        "geospatial_y_resolution": "25000 meters",
+        "geospatial_lat_min": -90.0,
+        "geospatial_lat_max": -39.23089,
+        "geospatial_lon_min": -180.0,
+        "geospatial_lon_max": 180.0,
+        "geospatial_lat_units": "degrees_north",
+        "geospatial_lon_units": "degrees_east",
+    },
+}
+
+
+if __name__ == "__main__":
+    import sys
+
+    all_gridids = ("psn25", "pss25")
+    try:
+        gridid_list = (sys.argv[1],)
+        assert gridid_list[0] in all_gridids
+    except IndexError:
+        gridid_list = all_gridids
+        print("No gridid given, using: {gridid_list}", flush=True)
+    except AssertionError:
+        err_message = f"""
+        Invalid gridid
+        {sys.argv[1]} not in {all_gridids}
+        """
+        raise ValueError(err_message)
+
+    for gridid in gridid_list:
+        ifn = source_dir + base_filename[gridid]
+        assert os.path.isfile(ifn)
+
+        ofn = "./" + base_filename[gridid]
+
+        print(f" input file: {ifn}")
+        print(f"output file: {ofn}")
+        assert ifn != ofn
+
+        os.system(f"cp -v {ifn} {ofn}")
+
+        assert gridid in new_global_attrs_for_gridid.keys()
+
+        with Dataset(ofn, "r+") as ds:
+
+            new_attrs_dict = new_global_attrs_for_gridid[gridid]
+            ds.setncatts(new_attrs_dict)
+
+        print(f"Wrote: {ofn}")