For three years of data in the Luquillo Mountains of Puerto Rico, cloud base was lowest during the mid-summer dry season, and cloud bases were lower than the mountaintops as often in the winter dry season as in the wet seasons. The results indicate climate change threats to cloud forests are not limited to the dry season; changes in synoptic-scale weather patterns that increase frequency of drought periods during the wet seasons (periods of higher cloud base) may also impact ecosystem health.