I still ignite the rubber cement when doing a patch job in cold/wet weather.
Apply a coat of cement slightly larger than the patch, light it with the Bic lighter that lives in my patch kit. If it is still burning after 5 seconds I blow it out. Apply another coat of cement, light it, let it burn for about 3 seconds, blow it out and quickly apply the ready to go patch. Squeeze the heck out of it for 30 seconds and you are good to go.
Has never failed regardless of weather conditions.