Last Update: 07 March 2018
Monthly weather and climate data can be found here for the State of Georgia and the City of Atlanta. Quick data points and rankings are posted on the left side of the homepage. All data is pulled from the National Oceanic and Atmospheric Administration (NOAA) websites and is updated monthly. We’ll be adding much more data and information in the future.
State of Georgia Average Temperature
The figure below shows the average temperature up to that point in the year for the State of Georgia versus the historical 20th Century Average for that time period. Average daily temperatures are calculated by adding the high temperature to the low temperature and dividing by two. All the daily average temperatures are then used to determine the monthly average temperature.
NOAA has provided a ranking tool to put the data into greater context. Using 123 years of recorded data, the tool shows you how data for a particular time period compares to historical data for that time period.
The chart below uses the Year-to-Date feature to show how warm or cool the year has been up to that point compared to previous years up to that point. For example, the average temperature in Georgia from January 1, 2017 to February 28, 2017 was 54.8 ºF (orange bar). Historically, the average temperature during that period is 47.4 °F (black line). This is a departure from the historical average of +7.4 °F. In 123 years of record keeping, January 1, 2017 to February 28, 2017 was the 3rd warmest such time period of any year. The average temperature in Georgia between January 1, 2017 and June 30, 2017 was 67.3 °F while the historical average temperature for that time period is 63.8 °F. In 123 years of record keeping, January 1, 2017 to June 30, 2017 was the warmest such time period of any year.
With temperatures 10.3°F above average, February 2018 passed February 2017 as the warmest February on record in Georgia. Thanks to a cold January, the average year-to-date temperature in 2018 was only 3.3°F above average.
City of Atlanta Average Temperature
The figure below shows the actual average monthly temperatures at Atlanta Hartsfield International Airport for 2017 versus the normal average monthly temperatures. The numbers above each bar represent the difference between the actual average monthly temperature the normal average monthly temperature. For example, in April 2017 the actual average monthly temperature was 67.8 °F and the normal average monthly temperature was 62.0 °F. The average temperature was therefore 5.8°F above normal. The Year-to-Date is the average of the actual and normal monthly temperatures from January 1st to the end of the previous month. All data is from the National Weather Service Forecast Office in Peachtree City, GA.
February 2018 temperatures mimicked those a year ago. The average temperature in Atlanta was over 10°F above average. This surpassed February 2017 as the warmest February on record. Over the past 13 months only 3 months have had temperature below average: June 2017, August 2017, and January 2018. As the chart below shows, several days had low temperatures well above the average high temperature for the day (February 11 and 21 to name a few). Only four days in February saw the high temperature below the average high temperature. The low temperature on February 21 was 65°F, which was 27°F above the average low temperature. To put that in comparison, the lowest temperature we experienced during the January 2018 cold snap was only 19°F below average.
Atlanta Average Precipitation
The chart below shows the actual monthly precipitation recorded at Atlanta Hartsfield International Airport (blue and white bar) versus the average monthly precipitation (blue line). The numbers above the bars represent the difference between the actual rainfall and the average rainfall for that time period. For example, rainfall in January 2017 was 8.18 inches while the average rainfall is 4.20 inches. The difference is +3.98 inches. All data is from the National Weather Service Forecast Office in Peachtree City, GA.
Atlanta finished 2017 with a surplus of precipitation. January 2018 brought slightly drier conditions with the month finishing close to 1 inch below normal precipitation levels. Rainfall in February 2018 was 1.44 inches above average.
The Palmer Drought Severity Index (PDSI) is a widely used model designed to predict drought conditions. The PDSI has its advantages and disadvantages, but NOAA and state and local governments use it to assess drought conditions over time. Negative numbers correspond to drier conditions while positive numbers correspond to wetter conditions. A PDSI value of -4.0 or below corresponds to extreme drought conditions.
Each state is divided into climate divisions with Georgia having nine division. They are numbered from northwest to southeast; metro Atlanta is in District 2 (second from top left) as is Lake Lanier, one of the state’s most important reservoirs. Drought conditions both upstream and downstream of Lake Lanier will influence the reservoir’s water levels. Dryer conditions in District 2 and 3 will result in less water flowing into Lake Lanier while wetter conditions in South Georgia can result in less water being released from Lake Lanier. Below is a GIF of PDSI values for every climate division the country.