I had a premature lamb and although it was 60 degrees outside because he had a hard time feeding he could not hold his heat, a lamb should be at least 103 anything lower is hypothermia. Because I did not get to him fast enough and the person that gave him to me didn't get colostrum in him he passed away. Remember just because we are warm it is not always warm enough for an orphan lamb.
Sorry to hear that you lost your lamb, Cynthia. Unfortunately, in farming and livestock you win some and you sometimes lose a lot more that you win. However, with passing this knowledge on to others they will hopefully be more wiser next time.