ShipCompliant has released a fun tool that may help you manage shipping concerns over the heat of the summer. The tool shows forcasted temperatures across the country for the next 5 days and lets you set a temperature threshold above which you elect to hold shipments. There is also a file upload tool that will analyze the zip codes of your shipments against your temperature threshold.
To use the tool you will need to surrender your contact information to Ship Compliant but it should be worth the cost. The tool is here: ShipCompliant.