diff --git a/server/src/forecast.mjs b/server/src/forecast.mjs
index 00d993a..ab49f38 100644
--- a/server/src/forecast.mjs
+++ b/server/src/forecast.mjs
@@ -205,9 +205,8 @@ function summarise(slots) {
 
 	// Most frequent label/code by occurrence
 	const labelCount = {}
-	for (const s of slots) labelCount[s.label] = (labelCount[s.label] || 0) + 1
-	const label = Object.entries(labelCount).filter(row => row.daytime)
-		.sort((a, b) => b[1] - a[1])[0][0]
+	for (const s of slots.filter(s => s.daytime)) labelCount[s.label] = (labelCount[s.label] || 0) + 1
+	const label = Object.entries(labelCount).sort((a, b) => b[1] - a[1])[0][0]
 	const dominant = slots.find(s => s.label === label)
 
 	return {