The climate of New Orleans is humid subtropical , with short, generally mild winters and hot, humid summers; most suburbs and parts of Wards 9 and 15 fall in USDA Plant Hardiness Zone 9a, while the city’s other 15 wards are rated 9b in whole. The monthly daily average temperature ranges from 53.4 °F (11.9 °C) in January to 83.3 °F (28.5 °C) in July and August. Officially, as measured at New Orleans International Airport, temperature records range from 11 to 102 °F (−12 to 39 °C) on December 23, 1989, and August 22, 1980, respectively; Audubon Park has recorded temperatures ranging from 6 °F (−14 °C) on February 13, 1899, up to 104 °F (40 °C) on June 24, 2009. Dewpoints in the summer months (June–August) are relatively high, ranging from 71.1 to 73.4 °F (21.7 to 23.0 °C).
The average precipitation is 62.5 inches (1,590 mm) annually; the summer months are the wettest, while October is the driest month. Precipitation in winter usually accompanies the passing of a cold front. On average, there are 77 days of 90 °F (32 °C)+ highs, 8.1 days per winter where the high does not exceed 50 °F (10 °C), and 8.0 nights with freezing lows annually. It is rare for the temperature to reach 20 or 100 °F (−7 or 38 °C), with the last occurrence of each being February 5, 1996, and June 26, 2016, respectively.
New Orleans experiences snowfall only on rare occasions. A small amount of snow fell during the 2004 Christmas Eve Snowstorm and again on Christmas (December 25) when a combination of rain, sleet, and snow fell on the city, leaving some bridges icy. The New Year’s Eve 1963 snowstorm affected New Orleans and brought 4.5 inches (11 cm). Snow fell again on December 22, 1989, during the December 1989 United States cold wave, when most of the city received 1–2 inches (2.5–5.1 cm).
The last significant snowfall in New Orleans was on the morning of December 11, 2008.