refactor

src/routes/weather/utils/colors.ts

@@ -45,7 +45,9 @@ export const getColor = (temperature: number, unit = 'celsius'): string => {
 	} else if (temperature >= 60) {
 		index = colorScaleHex.length - 1;
 	} else {
-		index = Math.round(temperature) + 45;
+		// clamp: the scale has exactly 100 entries (-45..54), temperatures in
+		// [55, 60) would otherwise index past the end
+		index = Math.min(colorScaleHex.length - 1, Math.max(0, Math.round(temperature) + 45));
 	}
 
 	return colorScaleHex[index];