Rosh Chodesh Shvat is always one day, because Tevet has 29 days. Rosh Chodesh Sh’vat can fall on five different days of the week: It is Shabbat 30.0% of the time. Monday (28.0%), Thursday (20.1%), Wednesday (18.0%), Tuesday (3.9%), and never on Sunday or Friday. The Jewish Calendar dates from Rosh Chodesh of the Adar right before Nissan until the 29th of Cheshvan of the following year have no variables. Each of the dates in that range have 4 days of the week they can fall on, and three that they cannot. On the other hand, there are years with and years without a 30 Cheshvan, a 30 Kislev, and a 1-30 Adar Alef. This creates a situation where the dates in this range can fall on a different number of days of the week. [The
Parshat Va'eira Homepage]
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