My experience with cold weather shipping: I was not sure if I should ask the breeder to ship them, but when above 5c it was no problem at all he told me. So lets do it. The temperature was around 5 - 8 celcius that period. He packed the shrimp in a double bag with 50% water, in a foam box with the heatpack taped to the side (should not touch the bag with shrimp else they get 'boiled'). Shipping took 2 days.
When they arrived the temperature of the water was still 14c. I put them in a room and measured it took about 5 hours till the water became the room temperature of 20c. Then I put the bag in the tank and in about half an hour is became 22c. I took another 2 hours to slowly add water into the bag and them released them in the tank.
They survived the first week. After a month I still count 7 out of 10 of them most of the time, but it could be possible they all are alive since it's a 100l tank with a lot of green.
So it's possible for sure, shrimp can handle this when they are packed firmly.
They other way around (hot temperatures) I have no experience, but I would prefer cold over hot, since a box in the sun is game over in not time I imagine.