F R e N c H 3 z,
When my Cephs get this snowy stuff during the rainy season in November and December, I use the following to good effect. http://www.wilkinsonplus.com/content.../0199758_l.jpg Not sure if you are able to get the exact same product but one that has a similar chemical component will work as well.
IMHO As for dropping the night temperatures, it is not necessary. All my Cephs grow side-by-side lowland Neps at my balcony year round. The nights do not go below 75-77F.