Climate of Georgia (U.S. state)

Worldwide climate classifications

The climate of Georgia is typical of a humid subtropical climate with most of the state having mild winters and hot summers. The Atlantic Ocean on the east coast of Georgia and the hill country in the north impact the state's climate. Also, the Chattahoochee River divides Georgia into separate climatic regions with mountain region to the northwest being colder than the rest of Georgia, the average temperature for that region in January and July being 39 °F (4 °C) and 78 °F (26 °C) respectively. Winter in Georgia is characterized by mostly mild temperatures and little or no snowfall around the state, except for instances of cold, heavy snow and icing in North and Central Georgia. Many summer days in Georgia have been known to exceed 90 °F (32 °C). The state experiences widespread precipitation. Tornadoes and tropical cyclones are common.

Temperatures

Monthly average daily high and low temperatures for major Georgia cities
City	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Athens	51/11 33/1	56/13 35/2	65/18 42/6	73/23 49/9	80/27 58/14	87/31 65/18	90/32 69/21	88/31 68/20	82/28 63/17	73/23 51/11	63/17 42/6	54/12 35/2
Atlanta	52/11 34/1	57/14 36/2	65/18 44/7	73/23 50/10	80/27 60/16	87/30 67/19	90/32 71/22	89/31 70/21	84/28 64/18	75/23 53/12	64/17 44/7	56/13 36/2
Augusta	56/13 33/1	61/16 36/4	69/21 42/6	77/25 48/9	84/29 57/14	90/32 65/18	92/33 70/21	90/32 68/20	85/29 62/17	76/24 50/10	68/20 41/5	59/15 35/2
Columbus	57/14 37/3	62/17 39/4	69/21 46/8	76/24 52/11	83/28 61/16	90/32 69/21	92/33 72/22	91/32 72/22	86/30 66/19	77/25 54/12	68/20 46/8	59/15 39/4
Macon	57/14 34/1	61/16 37/3	68/20 44/7	76/24 50/10	83/28 59/15	90/32 67/19	92/33 70/21	90/32 70/21	85/29 64/18	77/25 51/11	68/20 42/6	59/15 36/2
Savannah	60/16 38/3	64/18 41/5	71/22 48/9	78/26 53/12	84/29 61/16	90/32 68/20	92/33 72/22	90/32 71/22	86/30 67/19	78/26 56/13	70/21 47/8	63/17 40/4
Temperatures are given in °F/°C format, with highs on top of lows. [1]

The majority of Georgia is primarily a humid subtropical climate tempered somewhat by occasional polar air masses in the winter. Hot and humid summers are typical, except at the highest elevations. The degree to which the weather of a certain area of Georgia is subtropical depends not just on the latitude, but also on how close it is to the Atlantic Ocean or Gulf of Mexico and the altitude. This is especially true in the mountainous areas in the northern part of the state, which are further away from ocean waters and can be up to 4,500 feet (1,400 m) or higher above sea level. The areas near the Florida/Georgia border, extending from the entire Georgia coastline west to the Florida panhandle, experiences the most subtropical weather, similar to that of Florida: hot, humid summers with frequent afternoon thunderstorms and mild, somewhat drier winters.

In spite of having moderate weather compared to many other states, Georgia has occasional extreme weather. The highest temperature ever recorded is 112 °F (44 °C), while the lowest ever recorded is −17 °F (−27 °C). Heat waves involving temperatures over 100 °F (38 °C) have been recorded in the past.

Precipitation

Average annual precipitation for Georgia

The entire state, including the north Georgia mountains, receives moderate to heavy precipitation, which varies from 45 inches (1,100 mm) in central Georgia to approximately 75 inches (1,900 mm) around the Northeast part of the state. Georgia has had severe droughts in the past, especially in 2007.

Tropical cyclones

See also: United States tropical cyclone rainfall climatology

Although Georgia is vulnerable to hurricanes, it only rarely experiences a direct hurricane strike (due to its fairly small coastline at a sharp angle making it a small target). More common are hurricanes which strike the Florida Panhandle, weaken over land, and bring tropical storm or hurricane force winds and heavy rain to the Georgia interior (especially the southwestern areas), as well as hurricanes that come close to the Georgia coastline, brushing the coast on their way up to hit the Carolinas. Tropical Storm Alberto in July 1994 looped across central Georgia, leading to 24-hour rainfall amounts exceeding 20 inches (510 mm) across central sections of the state. It also became the wettest tropical cyclone on record for the state of Georgia, eclipsing the record set in 1929.

Winter

Southern and southeast areas of the state experience snow much less frequently than other parts of Georgia. The Georgia Piedmont area is somewhat cooler in winter than the coastal areas. The Southern areas of the Piedmont may receive snow every other year, while areas close to the foothills get snow several times a year. The mountains of Georgia have the coolest climate and most frequent snowfall in the state, although snowfall is less than any other part of the Appalachian Mountains. The main winter weather hazard in northern Georgia is "freezing rain - or icing, heavy snow - which is 2 inches (5.1 cm) or more of snow falling in a 12 hour period, or 4 inches (10 cm) or more in a 24 hour period." The exception to this is the mountain areas of Fannin, Gilmer, Pickens, and other surrounding counties heavy snow is "3 inches (7.6 cm) or more of snow in a 12 hour period or 4 inches (10 cm) or more of snow in a 24 hour period". Watches for heavy snow are issued when a 50 percent or greater chance of 2 inches (5.1 cm) or more of snow falling in a 12 hour period, or 4 inches (10 cm) or more in a 24 hour period is expected. Again, there are exceptions in the counties listed previously. The metro Atlanta area usually experiences slight amounts of frozen precipitation once a year. During the previous 5 years, no more than a trace of frozen precipitation has been recorded officially for Atlanta. The criteria for the mountain counties is "3 inches (7.6 cm) inches or more of snow in a 12 hour period or 4 inches (100 mm) or more of snow in a 24 hour period".

Winter weather watches are issued when there is a "50 percent or greater chance of significant and damaging accumulations of ice during freezing rain situations"; these watches are normally issued 12 to 48 hours in advance. A winter storm warning for an ice storm means that icy conditions are "occurring, imminent, or have a very high probability of occurring". These warnings are usually issued when there is an 80 percent or greater chance of meeting ice storm conditions.

It is rare in Georgia for blizzards to occur. The last blizzard the state had was in March 1993.

Winter in South Georgia, which lasts from December to January, is much more mild. Daytime highs range from approximately 50 °F (10 °C) in the northernmost interior areas to near 70 °F (21 °C) along the coast and in the extreme south.

Spring

Spring in North Georgia and the mountains are ever changing from day to day and year to year. Early spring in the North Georgia Mountains can be very chilly during the day; average highs are near 62 °F (17 °C). The weather can be highly variable with temperatures ranging between 75 °F (24 °C) and 40 °F (4 °C). The rainiest time of the year is normally April, which can also be a windy month where daytime temperatures can rise to near 75 °F (24 °C) and evening temperatures fall to around 40 °F (4 °C).

Summer

Summers are hot and humid with temperatures in the afternoons that reach, on average, to near 90 °F (32 °C). Overnight lows fall to near 68 °F (20 °C) and there is usually an 8-10 degree Fahrenheit (5 degree Celsius) difference in temperature between the mountains and Atlanta. While humidity in North Georgia, especially in the mountains, can be high it is not as high as it is in South Georgia. Summer thunderstorms add to the humidity in the area by providing 4.5 inches (110 mm) to 5.5 inches (140 mm) of rain during the summer months.

Tornadoes

Georgia is one of the leading states in incidents of tornadoes. The areas closest to the Florida border get the same small F0 and F1 tornadoes associated with summer afternoon thunderstorms. However, it is very uncommon for tornadoes to become severe (over M3).

Fall

Georgia's autumns are normally sunny and cool. September and October, the driest months of the year, qualify as "Indian Summer" weather with temperatures that are near 78 °F (26 °C) during the daytime. At night, the temperature drops to near 50 °F (10 °C). It is much cooler in November with an average high of 62 °F (17 °C) and low of 36 °F (2 °C). The first freeze of the year normally falls within October.

See also

• List of wettest known tropical cyclones in Georgia