I ordered mine (25 pullets) from Meyer for July 30th delivery. It's been really hot in NH - although it's not now, it's rainy and cool and the weather is not promising for the next several days at least. When they arrived on the 30th, it was pretty warm and often humid, and we were shocked to count 42 chicks! They were all alive and peeping. They are all still alive and peeping, and now trying to fly the coop! (or brooder).
Long story short: I wouldn't hesitate to order new chicks at most any time of year, providing the shipping method is quick and they are packed in their shipping boxes appropriately...and you have a cooperative local post office. People buy baby chicks all year long in all climates. At least, that's what I've been discovering in my research. We're new to this so we've looked into it a lot.
Good luck to you!
Long story short: I wouldn't hesitate to order new chicks at most any time of year, providing the shipping method is quick and they are packed in their shipping boxes appropriately...and you have a cooperative local post office. People buy baby chicks all year long in all climates. At least, that's what I've been discovering in my research. We're new to this so we've looked into it a lot.
Good luck to you!