While we can't say for sure, there are a few reasons that might cause your cake to sink in the middle. One is from underbaking, which probably isn't the issue unless your oven is getting older and no longer keeping temperature as well as it used to. Another is from too much liquid in your batter. If the air is becoming more humid as it warms up, this can lead to your flour and other ingredients retaining more moisture in them, resulting in a wetter batter. In this case, reducing the liquid in your recipe slightly when the atmosphere is more humid could help. Finally, your oven might have hot spots that are leading to uneven baking. You can learn more about how to find your oven's hot spots here: Identifying oven hot spots. Hope this helps! Kat@KAF

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