Johns Creek, Georgia climate: NOAA's gridded normals for the city, beside the nearest station records
NOAA's gridded 1991-2020 normals put Johns Creek's center at January lows of 32°F and July highs of 89°F, a yearly mean of 60.7°F and 53.1 inches of precipitation. No NOAA station keeps a record under the city's name. The nearest station record, Chamblee (12 miles SW, 1,002 ft), has January lows of 33°F and July highs of 89°F.
81,167 people (Census Bureau 2024). Distances and directions are from the city's center.
- Jan 52° 32°
- Feb 56° 35°
- Mar 64° 41°
- Apr 73° 48°
- May 80° 57°
- Jun 86° 65°
- Jul 89° 69°
- Aug 88° 68°
- Sep 82° 62°
- Oct 73° 50°
- Nov 63° 40°
- Dec 54° 35°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
The months above are NOAA's gridded normals at Johns Creek's center.
What is each month like in Johns Creek?
NOAA's grid estimates the normals every 5 km or so from the stations around each point, terrain included. It smooths between stations, so night lows at the heart of a large city can run warmer than the grid shows: at five big-city airports we compared, the grid's highs were within about 1°F of the station and its lows 1-6°F cooler. The nearest record's high and low are beside each month.
| Month | High | Low | Mean | Precip. | Chamblee high | Chamblee low |
|---|---|---|---|---|---|---|
| January | 52°F | 32°F | 42.1°F | 4.76 | 52°F | 33°F |
| February | 56°F | 35°F | 45.5°F | 4.79 | 56°F | 36°F |
| March | 64°F | 41°F | 52.6°F | 5.02 | 64°F | 42°F |
| April | 73°F | 48°F | 60.1°F | 4.05 | 73°F | 49°F |
| May | 80°F | 57°F | 68.1°F | 3.91 | 80°F | 59°F |
| June | 86°F | 65°F | 75.2°F | 4.64 | 86°F | 66°F |
| July | 89°F | 69°F | 78.6°F | 4.67 | 89°F | 70°F |
| August | 88°F | 68°F | 77.6°F | 4.54 | 88°F | 69°F |
| September | 82°F | 62°F | 71.9°F | 4.17 | 83°F | 63°F |
| October | 73°F | 50°F | 61.5°F | 3.64 | 73°F | 51°F |
| November | 63°F | 40°F | 51.2°F | 4.25 | 63°F | 41°F |
| December | 54°F | 35°F | 44.5°F | 4.66 | 54°F | 36°F |
In metric: a yearly mean of 15.9°C, January lows of 0°C, July highs of 32°C and 1,348 mm of precipitation a year.
Source: NOAA NCEI U.S. Monthly Gridded Climate Normals 1991-2020 (nClimGrid, accession 0245564); NOAA NCEI 1991-2020 station normals. The grid cell holding the city's Census center point.
What do the station records around Johns Creek say?
Each row is a NOAA station's own 1991-2020 normals, with the snow and frost dates the grid does not give. A record downhill or nearer the coast than the city can run warmer, one uphill cooler: compare the elevations.
| Record | Where | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| ChambleeAtlanta Peachtree Airport | 12 mi SW | 1,002 ft | 61.5°F | 33°F | 89°F | 51.4 | – | March 25 |
| Cumming2 mi N | 14 mi N | 1,140 ft | 60.1°F | 31°F | 89°F | 56.4 | 1 | April 4 |
| Mableton1 mi N | 25 mi SW | 980 ft | 60.1°F | 32°F | 84°F | 56.2 | 1 | March 27 |
Source: NOAA NCEI 1991-2020 U.S. Climate Normals; place center and population: Census Bureau 2024. Last frost: the median last spring date of 32°F.
How much snow, how late a frost, what zone and how much sun in Johns Creek?
NOAA's grid gives no snow, frost dates or records, so these come from the nearest station record, Chamblee (12 miles SW, 1,002 ft). NOAA publishes no snowfall normal for it; the nearest record that has one, Cumming (14 miles N), gets 1 inches a year. The last spring frost (32°F) comes after March 25 in half of years and the first autumn frost before November 9. Its record high is 105°F (2012) and its record low 5°F (2014) (kept since 1998).
The USDA's 2023 Plant Hardiness Zone Map puts Johns Creek in zone 8a across its 3 ZIP code areas.
Over a year 77% of the sunlight that would reach the ground under clear skies gets through the clouds in the area (4.5 kWh per square metre a day, NASA POWER 2001-2020); July is the sunniest month (80%) and February the cloudiest (69%).
Chamblee's page has its months, frost probabilities, records by month and recent years. NOAA's grid has monthly figures only, so there are no day-by-day month pages for Johns Creek; the nearest record's month pages have them.
Source: NOAA NCEI 1991-2020 normals, station USW00053863; records: ACIS; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; sunshine: NASA POWER.
How does the climate vary across Johns Creek, ZIP code by ZIP code?
3 ZIP code areas lie wholly or partly in Johns Creek. On NOAA's grid 30022 is the warmest (60.7°F a year) and 30005 the coolest (60.3°F), so the city is nearly uniform. Each row also names the nearest station record and its frost dates.
| ZIP code | Zone | Year | Jan low | Jul high | Precip. | Nearest record | Last frost | First frost |
|---|---|---|---|---|---|---|---|---|
| 30005 | 8a | 60.3°F | 32°F | 88°F | 53.9 | Cumming (11 mi) | April 4 | November 4 |
| 30022 | 8a | 60.7°F | 32°F | 89°F | 53.1 | Chamblee (11 mi) | March 25 | November 9 |
| 30097 | 8a | 60.7°F | 32°F | 89°F | 53.2 | Chamblee (14 mi) | March 25 | November 9 |
Source: Census Bureau 2020 ZCTA-to-place relationship file and ZCTA centers; NOAA NCEI gridded and station normals, 1991-2020. A ZIP area counts when at least a tenth of its land (and 0.5 km²) is in the city; its figures are the grid cell at its center; frost dates are the nearest record's medians of 32°F.