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If (the sky) is cloudy for you, then calculate thirty days (for the month of Ramadan).

Ibn ‘Umar reported the Messenger of Allaah(ﷺ) as saying “The month consists of twenty nine days, but do not fast till you sight it (the moon) and do not break your fast till you sight it. If the weather is cloudy, calculate it thirty days.

: "The Messenger of Allah said: 'Fast when you see it and stop fasting when you see it, and if it is obscured from you (too cloudy), then count it as thirty (days).'"

Ibn 'Umar (RAA) narrated, ‘I heard the Messenger of Allah (ﷺ) say, "Start fasting after you have seen it (i.e. the new crescent) and end the fast (at the end of the month) when you see it. If it is overcast and cannot be seen, then estimate