In 70-degree conditions, a yellow glue joint requires an hour of clamping and a day of drying to reach full strength. But if you're working in a cold garage in the winter, double the clamp time and drying time for each 15-degree drop below 70 degrees. Ordinary yellow glue works down into the mid-40s, but the temperature of the wood is more critical than the air temperature. If your lumber has been in freezing conditions all night, don't expect a space heater to warm it to optimal levels in a short time.