Johns Creek, GA climate
Johns Creek has mild winters and warm summers, with plenty of rain. A typical July afternoon reaches 89°, a January night drops to 32°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Johns Creek feels like
Winter
Spring
Summer
Fall
Johns Creek weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 52° | 32° | 4.8" | 0.1" | 11 | 0 | 34° – 49° |
| February | 56° | 35° | 4.8" | 0.2" | 11 | 0 | 37° – 54° |
| March | 64° | 41° | 5.0" | 0.3" | 11 | 0 | 46° – 62° |
| April | 73° | 48° | 4.1" | 0 | 9 | 0 | 56° – 65° |
| May | 80° | 57° | 3.9" | 0 | 11 | 0 | 63° – 73° |
| June | 86° | 65° | 4.6" | 0 | 11 | 0 | 71° – 79° |
| July | 89° | 69° | 4.7" | 0 | 12 | 0 | 76° – 82° |
| August | 88° | 68° | 4.5" | 0 | 10 | 0 | 74° – 83° |
| September | 82° | 62° | 4.2" | 0 | 8 | 0 | 69° – 78° |
| October | 73° | 50° | 3.6" | 0 | 8 | 0 | 58° – 66° |
| November | 63° | 40° | 4.3" | 0 | 9 | 0 | 46° – 57° |
| December | 54° | 35° | 4.7" | 0 | 11 | 0 | 35° – 54° |
| Year | 72° | 50° | 53.1" | 0.6" | 120 | 0 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Johns Creek
Johns Creek gets 53 inches of rain and melted snow a year. March is the wettest month and October the driest. Rain or snow falls on about 120 days a year.
About 228 frost-free days a year
In half of years the last 32° night comes by March 25 and the first one by November 9. That leaves about 228 frost-free days for gardens, longer than 85% of U.S. towns.
Heating and cooling a home in Johns Creek
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Johns Creek, 63% of that work is heating and 37% is cooling.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Johns Creek and its neighbors
Johns Creek borders 3 towns with climate data. January nights across them vary by 0.2°. Alpharetta has the coldest January nights (32°) and Roswell the hottest July afternoons (89°). Johns Creek’s January low is 32° and its July high 89°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Johns Creek compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Johns Creek averaged 0.9° warmer than the 1900s. The biggest change is in December (+2.3°). The shift is smaller than in 77% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Johns Creek’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 35° to 54°. July is the most reliable, staying within 6°.
Common questions about Johns Creek’s climate
What is the coldest month in Johns Creek?
January, with a typical high of 52° and a low of 32°.
What is the hottest month in Johns Creek?
July, with a typical high of 89° and a low of 69°. About 53 days a year reach 90°.
How much snow does Johns Creek get?
Almost none. A normal year brings 0.6 inches.
When is the first frost in Johns Creek?
In half of years the first 32° night comes by November 9, and the last spring frost by March 25.
What is the rainiest month in Johns Creek?
March, with 5.0 inches of rain and melted snow. The year totals 53 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Johns Creek itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Cumming 2n, GA (14 mi, snow) and Atlanta Peachtree Airport, GA (12 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.