Suwanee, GA climate
Suwanee has mild winters and warm summers, with plenty of rain. A typical July afternoon reaches 88°, a January night drops to 32°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Suwanee feels like
Winter
Spring
Summer
Fall
Suwanee 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° – 48° |
| February | 56° | 35° | 4.9" | 0.2" | 11 | 0 | 37° – 54° |
| March | 64° | 41° | 5.1" | 0.3" | 11 | 0 | 46° – 62° |
| April | 72° | 48° | 4.0" | 0 | 9 | 0 | 56° – 65° |
| May | 79° | 57° | 4.0" | 0 | 11 | 0 | 63° – 73° |
| June | 86° | 64° | 4.8" | 0 | 11 | 0 | 70° – 79° |
| July | 88° | 68° | 4.6" | 0 | 12 | 0 | 76° – 82° |
| August | 87° | 67° | 4.6" | 0 | 10 | 0 | 74° – 83° |
| September | 82° | 61° | 4.1" | 0 | 8 | 0 | 69° – 78° |
| October | 73° | 50° | 3.8" | 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 | 71° | 50° | 53.5" | 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 Suwanee
Suwanee 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 214 frost-free days a year
In half of years the last 32° night comes by April 4 and the first one by November 4. That leaves about 214 frost-free days for gardens, longer than 80% of U.S. towns.
Heating and cooling a home in Suwanee
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Suwanee, 69% of that work is heating and 31% 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.
Suwanee and its neighbors
Suwanee borders 2 towns with climate data. January nights across them vary by 0.2°. Duluth has both the coldest January nights (32°) and the hottest July afternoons (89°). Suwanee’s January low is 32° and its July high 88°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Suwanee 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 Suwanee averaged 0.8° warmer than the 1900s. The biggest change is in December (+2.2°). The shift is smaller than in 85% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Suwanee’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 Suwanee’s climate
What is the coldest month in Suwanee?
January, with a typical high of 52° and a low of 32°.
What is the hottest month in Suwanee?
July, with a typical high of 88° and a low of 68°. About 32 days a year reach 90°.
How much snow does Suwanee get?
Almost none. A normal year brings 0.6 inches.
When is the first frost in Suwanee?
In half of years the first 32° night comes by November 4, and the last spring frost by April 4.
What is the rainiest month in Suwanee?
March, with 5.1 inches of rain and melted snow. The year totals 53 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Suwanee itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Cumming 2n, GA (13 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.