Ответ:

1. The weather was nice today. It snowed. 2. It often snows in winter. I hope it will snow tomorrow. 3. It often rains here in autumn. 4. It snowed yesterday. 5. It is raining now. 6. It rained last week. 7. When he left the office it was raining. 8. It was snowing at 7 o'clock yesterday. 9. It often snowed last winter.