This Hadith Answers Your Question Very Well.
A rainy day, Ibn 'Abbaas said to the mu'adhdhin:
"After you have said: "Ashhadu anna Muhammdar Raduulullaah" don't say: "Hayya 'Alaas-Salaah", rather say: "Salluu fee Buyuutikum (Pray in your houses)". The people noticed this and he (Ibn 'Abbaas) said: "One who is better than me did this. Friday is a honorable day, and I didn't want you to take you through hardships and make you walk through clay and dirt."
(Sahih Muslim, CHAPTER: PRAYING IN HOUSES WHEN IT RAINS, No. 1491)
From This Hadith we can get the Conclusion that if rain falls at time of Jummah Salah then we can pray at home.