Yes, see the table for air.
Table - Density of air ρ vs. temperature °C Effect of temperature °C ..... ρ in kg/m3 −10 ..... 1.342 .− 5 ..... 1.317 ....0 ..... 1.292 .+ 5 ..... 1.269 +10...
Yes. Temperatures even vary in different parts of countries. It all depends on how far away you are from the equator, the type of weather it is, the season and which half of the globe the country is...
A capacitor is rated to operate in a certain temperature range. It is not designed to operate as a variable temperature device. The temperature of a capacitor depends primarily on the ambient...