The National Weather Service forecasts partly sunny here in Cobb County on Wednesday, December 18, 2024, with a high near 70 degrees.
The National Weather Service has issued a hazardous weather outlook for Cobb County and other parts of the region due to patchy dense fog that is possible overnight through early Wednesday. Impacts could also occur for the morning commute.
48°F
Bonus for the more weather-curious among you … To read an article about interpreting a weather news report with some of the typical terminology defined, follow this link.
What you will read in this article
- The extended forecast for Cobb County
- Last month’s climate summary for the metro Atlanta region
- The climate almanac for metro Atlanta
- What the National Weather Service is, and what it does
To read an article about interpreting a weather news report, with some of the typical terminology defined, follow this link.
What does the extended forecast have in store?
This forecast is centered on Dobbins Air Reserve Base in Marietta.
Today
A 40 percent chance of showers and thunderstorms, mainly after 3 p.m. Areas of dense fog before 11 a.m. Otherwise, partly sunny, with a high near 70. Light and variable wind becoming southwest 5 to 10 mph in the morning.
Tonight
A chance of showers and thunderstorms before 10 p.m, then a slight chance of showers between 10 p.m and 1 a.m. Mostly cloudy, with a low around 42. Northwest wind around 5 mph. Chance of precipitation is 30 percent.
Thursday
Mostly sunny, with a high near 58. Northwest wind around 5 mph.
Thursday Night
Mostly clear, with a low around 37. Northwest wind around 5 mph becoming calm.
Friday
Sunny, with a high near 52.
Friday Night
Mostly clear, with a low around 30.
Saturday
Sunny, with a high near 47.
Saturday Night
Mostly clear, with a low around 27.
Sunday
Sunny, with a high near 46.
Sunday Night
Clear, with a low around 27.
Monday
Sunny, with a high near 45.
Monday Night
Mostly clear, with a low around 28.
Tuesday
Mostly sunny, with a high near 49.
What was the climate like in the latest reporting period?
The NWS climate summary for metro Atlanta has now been updated with November 2024 figures.
In an article entitled What is the Difference between Climate and Weather?, the National Ocean Service describes the difference as follows:
“Weather is what you see outside on any particular day. So, for example, it may be 75° degrees and sunny or it could be 20° degrees with heavy snow. That’s the weather.
“Climate is the average of that weather. For example, you can expect snow in the Northeast in January or for it to be hot and humid in the Southeast in July. This is climate. The climate record also includes extreme values such as record high temperatures or record amounts of rainfall. If you’ve ever heard your local weather person say “today we hit a record high for this day,” she is talking about climate records.
“So when we are talking about climate change, we are talking about changes in long-term averages of daily weather. In most places, weather can change from minute-to-minute, hour-to-hour, day-to-day, and season-to-season. Climate, however, is the average of weather over time and space.”
The climate report for the Atlanta area for the previous month shows how much departure from the average temperatures that month represents. The average temperature for a date is the average over a 30-year period.
| Date | High | Low | Average | Departure from Norm | Precipitation |
| 2024-11-01 | 75 | 64 | 69.5 | 10.8 | T |
| 2024-11-02 | 80 | 61 | 70.5 | 12.2 | 0 |
| 2024-11-03 | 67 | 60 | 63.5 | 5.5 | T |
| 2024-11-04 | 63 | 59 | 61 | 3.4 | T |
| 2024-11-05 | 78 | 61 | 69.5 | 12.2 | T |
| 2024-11-06 | 74 | 67 | 70.5 | 13.6 | T |
| 2024-11-07 | 73 | 67 | 70 | 13.4 | T |
| 2024-11-08 | 80 | 66 | 73 | 16.7 | 0 |
| 2024-11-09 | 75 | 63 | 69 | 13 | 0 |
| 2024-11-10 | 65 | 56 | 60.5 | 4.9 | 0.07 |
| 2024-11-11 | 76 | 57 | 66.5 | 11.2 | T |
| 2024-11-12 | 77 | 52 | 64.5 | 9.5 | 0 |
| 2024-11-13 | 66 | 52 | 59 | 4.3 | 0.04 |
| 2024-11-14 | 56 | 50 | 53 | -1.4 | 0.97 |
| 2024-11-15 | 66 | 48 | 57 | 2.9 | 0 |
| 2024-11-16 | 72 | 45 | 58.5 | 4.7 | 0 |
| 2024-11-17 | 73 | 46 | 59.5 | 6 | 0 |
| 2024-11-18 | 75 | 51 | 63 | 9.7 | 0 |
| 2024-11-19 | 64 | 59 | 61.5 | 8.5 | 1.63 |
| 2024-11-20 | 74 | 48 | 61 | 8.3 | 0.46 |
| 2024-11-21 | 60 | 41 | 50.5 | -2 | 0 |
| 2024-11-22 | 54 | 38 | 46 | -6.2 | 0 |
| 2024-11-23 | 61 | 37 | 49 | -2.9 | 0 |
| 2024-11-24 | 70 | 40 | 55 | 3.3 | 0 |
| 2024-11-25 | 72 | 46 | 59 | 7.6 | 0 |
| 2024-11-26 | 64 | 46 | 55 | 3.8 | 0.15 |
| 2024-11-27 | 65 | 42 | 53.5 | 2.6 | 0 |
| 2024-11-28 | 67 | 43 | 55 | 4.3 | 0.05 |
| 2024-11-29 | 51 | 36 | 43.5 | -7 | 0 |
| 2024-11-30 | 50 | 31 | 40.5 | -9.8 | 0 |
Climate Almanac for metro Atlanta
This almanac provides information on past climate conditions for December 18, allowing comparisons to current weather.
Simply put, it helps you see what the weather would typically be like on this day, according to historical data.
| Daily Data | Observed | Normal | Record Highest | Record Lowest |
| Max Temperature | M | 56 | 74 in 1984 | 23 in 1901 |
| Min Temperature | M | 38 | 62 in 2021 | 9 in 1901 |
| Avg Temperature | M | 46.8 | 66.5 in 1933 | 16.0 in 1901 |
| Precipitation | M | 0.15 | 1.89 in 2009 | 0.00 in 2023 |
| Snowfall | M | 0.1 | 1.3 in 1996 | 0.0 in 2023 |
| Snow Depth | M | – | 2 in 1932 | 0 in 2023 |
| HDD (base 65) | M | 18 | 49 in 1901 | 0 in 2021 |
| CDD (base 65) | M | 0 | 2 in 1933 | 0 in 2023 |
| Month-to-Date Summary | Observed | Normal | Record Highest | Record Lowest |
| Avg Max Temperature | 58.2 | 57.4 | 67.6 in 1956 | 43.7 in 1917 |
| Avg Min Temperature | 37.8 | 39.3 | 47.6 in 2012 | 27.5 in 1962 |
| Avg Temperature | 48.0 | 48.3 | 57.1 in 1956 | 35.6 in 1917 |
| Total Precipitation | 2.20 | 2.51 | 12.34 in 1919 | 0.00 in 1889 |
| Total Snowfall | 0.0 | 0.2 | 2.4 in 1958 | 0.0 in 2024 |
| Max Snow Depth | 0 | – | 2 in 2017 | 0 in 2024 |
| Total HDD (base 65) | 287 | 301 | 523 in 1917 | 139 in 1956 |
| Total CDD (base 65) | 1 | 1 | 13 in 1991 | 0 in 2023 |
| Year-to-Date Summary | Observed | Normal | Record Highest | Record Lowest |
| Avg Max Temperature | 76.3 | 73.9 | 76.3 in 2024 | 62.2 in 1878 |
| Avg Min Temperature | 57.5 | 54.7 | 57.5 in 2024 | 45.9 in 1878 |
| Avg Temperature | 66.9 | 64.3 | 66.9 in 2024 | 54.0 in 1878 |
| Total Precipitation | 61.40 | 48.37 | 69.17 in 1948 | 9.21 in 1878 |
| Total Snowfall (since July 1) | 0.0 | 0.2 | 2.4 in 1958 | 0.0 in 2024 |
| Max Snow Depth (since July 1) | 0 | – | 2 in 2017 | 0 in 2024 |
| Total HDD (since July 1) | 528 | 741 | 1316 in 1976 | 471 in 2015 |
| Total CDD (since Jan 1) | 2528 | 2050 | 2643 in 2019 | 33 in 1878 |
Period of Record:
- Max Temperature : 1878-10-04 to 2024-12-17
- Min Temperature : 1878-10-04 to 2024-12-17
- Precipitation : 1878-10-01 to 2024-12-17
- Snowfall : 1928-12-25 to 2024-12-17
- Snow Depth : 1928-12-25 to 2024-12-17
For much more information on the climate in our area, visit the NWS Climate FAQ for the Atlanta area.
What does the National Weather Service do?
The National Weather Service (NWS) is a part of the National Oceanic and Atmospheric Administration (NOAA).
The NWS describes its role as follows:
“The National Weather Service (NWS) provides weather, water, and climate forecasts and warnings for the United States, its territories, adjacent waters and ocean areas, for the protection of life and property and the enhancement of the national economy.
“These services include Forecasts and Observations, Warnings, Impact-based Decision Support Services, and Education in an effort to build a Weather-Ready Nation. The ultimate goal is to have a society that is prepared for and responds to weather, water and climate events.”
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