All three look fine.
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imantaghaviI found the second one a little weird.The other two look fine.The second one makes you think there will be another sentence to follow. Something like Yesterday was sunny. Today it is snowing. We're really having odd weather this month.
imantaghavi So, what you mean is that there should always be another sentence to follow that?No, not necessarily, but that sentence seems to impart a little more significance to the matter than the others.