In an average February, Rome has four days that dip below 32 degrees F; the average high is 56, and the average is 40. Paris averages 12 days each February below 32 degrees F; the average high is 45 and the average low is 34. Only you know what constitutes weather that is too cold to enjoy.
A fluorescent lamp or a fluorescent tube is a low pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor which produces short-wave ultraviolet light that then causes a phosphor coating on the inside of the bulb to glow.
Radioactive decay is the source of the energy that creates the light in that case.   There are variations like incandescent, which is the generation of light with thermal (heat) energy as its source. A regular light bulb does this (having converted electrical energy into thermal energy as a first step). The term fluorescent refers to the generation of light directly from the ionizing effects of electricity, and we know about fluorescent lights, too. We might also encounter a couple of other odd terms with escent at the end that speak to this property.