Paris lies in the midst of the Ile de France region, which has France's lowest rainfall, however the city is known for its unexpected rain showers which can occur at any time of year. Summer temperatures are mild to warm, with occasional heat waves, while winters are very chilly with temperatures hovering around freezing point.
Graph from http://www.climatetemp.info/france/paris.html
Average temperatures and rainfall:
Paris Weather and Climate Chart - Paris, France
The following are the normal daily temperature ranges for Paris: