In Houston this morning at 6:30 it was 54 degrees. Our normal daily temperature this time of year is 62. It is now 39. Tomorrow we will not get above freezing. I cannot recall ever having a prolonged hard freeze for this long and I am 65. I tend to agree with Ducan supporting the tilting of the earth's axis as the culprit having seen no indication of prolonged heat waves even where we are said to have a subtropical climate.