As you deduced from your examination of data sheets, the effect of temperature on film sensitivity is very slight, certainly less than half a stop within the normal weather range of 0F0°F to 100F100°F / -18°C to 38°C, so long as we are talking about brief exposures (not time exposures). You may want to check with Kodak for details. With extremely long exposures there may be a slighly greater effect. This site discusses related issues:
storage and handling of mp film
Since light is pure energy, it does not get cold. The reaction of silver halides to light is not a purely chemical one; it is a photo-chemical one, and hardly affected by temperature variations within the range that is safe for humans.