Under thick cloud cover, how much longer might a standard black tea need to steep compared to a hot, sunny day?

Answer

Eight, ten, or even twelve hours

Brewing time must be severely adjusted when the main heating source (direct sunlight) is removed. On a typical, bright, hot summer day, a black tea might reach full flavor extraction in about four hours. When the day transitions to being fully overcast, the ambient temperature often prevents the water from reaching the ideal steeping temperatures. To compensate for this significantly lower energy input, the required infusion period dramatically increases. Enthusiasts suggest that under these cool, cloudy conditions, the pitcher might need to sit out for extended periods, potentially ranging from eight hours, to ten hours, or even up to twelve hours, provided the ambient temperature remains reasonably warm, ideally above 75 degrees Fahrenheit, to achieve a comparable strength.

Under thick cloud cover, how much longer might a standard black tea need to steep compared to a hot, sunny day?
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