Aving a hard time cranking my Jaguar when its to cold or hot outside

With the weather changing to the winter time when I attempt to crank my car in the morning on the first attempt it wont crank it attempts to crank but want fully turn over to get the engine going so I will let it sit for 30 mins or longer typically when I come back the car cranks with no problem, I just replaced the spark plugs and I have a brand new battery any ideas to what my be happening