diff --git a/src/landscape.h b/src/landscape.h
new file mode 100644
--- /dev/null
+++ b/src/landscape.h
@@ -0,0 +1,19 @@
+/* $Id$ */
+
+/** @file landscape.h */
+
+enum {
+	SNOW_LINE_MONTHS = 12,
+	SNOW_LINE_DAYS   = 32,
+};
+
+struct SnowLine {
+	byte table[SNOW_LINE_MONTHS][SNOW_LINE_DAYS];
+	byte highest_value;
+};
+
+bool IsSnowLineSet(void);
+void SetSnowLine(byte table[SNOW_LINE_MONTHS][SNOW_LINE_DAYS]);
+byte GetSnowLine(void);
+byte HighestSnowLine(void);
+void ClearSnowLine(void);