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