Original sentence: " Retrieved on July 11, 2007.Based on the 1971-2000 period, the average first occurrence of at or below freezing tmeperatures in the fall is October 29 and the average last occurrence in the spring is April 8.Richmond has a humid subtropical climate (Koppen Cfa), with hot and humid summers and generally mild winters.Seasonal Temperature and Precipitation Information from The Weather Channel.Summertime high temperatures above  are not uncommon, but do not occur every year.Temperatures are seldom lower than , but there have been quite a few occurrences of subzero (below -18 °C) temperatures--most recently January 28, 2000 when the temperature reached -1 °F.The coldest weather normally occurs from late December to early February, when low temperatures usually average in the upper 20s °F (-3 to -2 °C), and the high temperatures in the mid-upper 40s (7 to 9 °C)
Edited sentence: Based on the 1971-2000 period, the average first occurrence of 32 degrees Fahrenheit in the fall is October 29 and the average last occurrence in the spring is April 8.Richmond's climate might be classified as modified continental.Summers are warm and humid and winters generally mild.Summertime high temperatures above 100 degrees are not uncommon, but do not occur every year.Temperatures seldom lower to zero, but there have been quite a few occurrences of below zero temperatures--most recently January 28, 2000 when the temperature reached -1°F.The coldest weather normally occurs from late December to early February, when low temperatures usually average in the mid-upper 20s, and the high temperatures in the mid-upper 40s