I'm not experienced enough in shipping to advise you from first hand experience but I came across this temperature recommendation guide from shipyourreptiles.com
"Regulating the temperature of the package
You might need to use a heat pack or cold pack inside your package. This decision depends on the type of animal you’re shipping and the daytime high temperature at your location and at the destination. If you have questions about a specific species or weather condition, consult a reputable breeder of your species for more detailed guidelines and parameters.
Reptiles
Below 45°F: Don’t ship. Wait for warmer weather.
45-70°F: Use a heat pack per our directions.
70-88°F: No heat pack required.
Over 88°F: Don’t ship. Wait for cooler weather."
Got the info from here:http://www.shipyourreptiles.com/en/get_help
Hope that helps somewhat.
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