diff --git a/priv/repo/migrations/20250729173130_add_rain_midnight_field.exs b/priv/repo/migrations/20250729173130_add_rain_midnight_field.exs
new file mode 100644
index 0000000..c84fdb0
--- /dev/null
+++ b/priv/repo/migrations/20250729173130_add_rain_midnight_field.exs
@@ -0,0 +1,27 @@
+defmodule Aprsme.Repo.Migrations.AddRainMidnightField do
+  use Ecto.Migration
+
+  def up do
+    # Add the missing rain_midnight field
+    alter table(:packets) do
+      add :rain_midnight, :float
+    end
+
+    # Copy data from rain_since_midnight to rain_midnight if rain_since_midnight exists
+    execute """
+    DO $$
+    BEGIN
+      IF EXISTS (SELECT 1 FROM information_schema.columns 
+                 WHERE table_name = 'packets' AND column_name = 'rain_since_midnight') THEN
+        UPDATE packets SET rain_midnight = rain_since_midnight WHERE rain_since_midnight IS NOT NULL;
+      END IF;
+    END $$;
+    """
+  end
+
+  def down do
+    alter table(:packets) do
+      remove :rain_midnight
+    end
+  end
+end
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