Not at all. Any temperature is good to use the Advance Carpenter Ant Bait. As long as there are ants around the bait will work, despite the temperature. The only time you would not want to apply it is if it is raining or going to rain within 24 hours. This product is best applied when you are going to have a few days of dry weather.
The Advance Carpenter Ant Bait, when applied correctly will not harm children or pets. Pets can be attracted to the granules but if they are applied correctly the pets should not be able to eat enough of them for it to be harmful. You are supposed to broadcast this product outside meaning you will be placing very small amounts in grass, mulch, etc. A pet would have to consume a large quantity of this product, meaning they would have to get into the container and consume a large amount to get sick. As with any cleaning product or otherwise, you should always keep the container out of reach of children and pets.