Tonight will be coldest night in history here

My wife was telling me that tonight here on the Northern California Coast will be the coldest night ever recorded for this date in history(since records have been kept).

My thinking is that it is caused by the Strong El Nino weather effect this year and possibly the ash has reached all around the earth through Asia and the Pacific Ocean to the California coast. When volcanoes like Pinatubo and Mt. St. Helens went off stuff like this happened too, globally. If Katla which is ten time bigger than the present Iceland volcano goes off it likely will be much worse worldwide in regard to weather and the growing of crops (because of lower temperatures) and the blockage of full suns rays ever reaching the earth, especially in the northern Hemisphere.