Pronunciation of English ⟨wh⟩

The pronunciation of the English digraph ⟨wh⟩ in words like which or whale has changed over time, and still varies today between different regions and accents. It is now most commonly pronounced /w/, identically with the voiced approximate ⟨w⟩ found in words like witch or wail, although some dialects, particularly those of Scotland, Ireland, and the Southern United States, retain the traditional voiceless aspirated pronunciation generally transcribed /ʍ/ or /hw/.

Source: Wikipedia — Pronunciation of English ⟨wh⟩ (CC BY-SA 4.0)