Added frost risk

server/src/openweather.mjs

@@ -18,3 +18,11 @@ export async function fetchIcon(icon) {
 		await downloadIcon(icon, iconPath);
 	return iconPath;
 }
+
+export function frostRisk(tempC, dewPointC, humidity) {
+	if (tempC > 4) return 'None'
+	if (tempC <= 0 && dewPointC <= 0) return 'High'
+	if (tempC <= 2 && humidity > 85) return 'Moderate'
+	if (tempC <= 4) return 'Low'
+	return 'None'
+}