"Store Clomid at room temperature, between 59 and 86 degrees F (15 and 30 degrees C). Store away from heat, moisture, and light. Do not store in the bathroom. Keep Clomid out of the reach of children and away from pets."
Well this is what I've found. It doesn't say anything about going to cold. I wouldn't imagine it would be ineffective, but it's your call not mine