Food spoilage is the process by which food products become unsuitable for ingestion.
Microbial, chemical, or physical changes occur due to outside factors depending upon the type of food product and how well it is packed and stored.
The summer season is the time of the year during which the temperature is most high. So the process of oxidation takes place at a higher rate.
Oxidation is the process that causes food spoilage.
Since this process occurs at a faster rate in summer, food spoilage rates in summer are also high.
The summer season is also the best season for microorganisms which may cause the food spoilage to multiply at a faster rate. This adds up to a faster rate of food spoilage.
Processes like hydrolysis and oxidation which cause food spoilage also occur at a faster rate resulting in a high rate of food spoilage.
Final answer: Cases of food spoilage are more in the summer season.