Bon Air, TN climate
Bon Air has chilly winters and pleasant summers, with plenty of rain. A typical July afternoon reaches 84°, a January night drops to 27°, and about 5 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Bon Air feels like
Winter
Spring
Summer
Fall
Bon Air 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 | 44° | 27° | 5.6" | 1.5" | 13 | 1 | 27° – 43° |
| February | 49° | 31° | 5.5" | 2.5" | 12 | 1 | 28° – 48° |
| March | 57° | 38° | 5.8" | 0.5" | 13 | 0 | 40° – 58° |
| April | 67° | 46° | 5.6" | 0 | 12 | 0 | 51° – 62° |
| May | 74° | 55° | 5.1" | 0 | 12 | 0 | 59° – 70° |
| June | 81° | 61° | 5.8" | 0 | 12 | 0 | 67° – 75° |
| July | 84° | 65° | 5.4" | 0 | 12 | 0 | 71° – 78° |
| August | 83° | 64° | 4.2" | 0 | 10 | 0 | 69° – 80° |
| September | 78° | 58° | 4.4" | 0 | 8 | 0 | 64° – 73° |
| October | 68° | 47° | 3.5" | 0 | 8 | 0 | 54° – 63° |
| November | 57° | 38° | 4.8" | 0.1" | 10 | 0 | 41° – 53° |
| December | 48° | 31° | 6.4" | 0.4" | 12 | 0 | 29° – 50° |
| Year | 66° | 47° | 62.1" | 5.0" | 135 | 2 |
“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 Bon Air
Bon Air gets 62 inches of rain and melted snow a year. December is the wettest month and October the driest. Rain or snow falls on about 135 days a year.
About 191 frost-free days a year
In half of years the last 32° night comes by April 15 and the first one by October 23. That leaves about 191 frost-free days for gardens, longer than 65% of U.S. towns.
Heating and cooling a home in Bon Air
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Bon Air, 74% of that work is heating and 26% 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.
How Bon Air 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 Bon Air averaged 0.8° warmer than the 1900s. The biggest change is in December (+1.8°). The shift is smaller than in 85% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Bon Air’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 29° to 50°. July is the most reliable, staying within 7°.
Common questions about Bon Air’s climate
What is the coldest month in Bon Air?
January, with a typical high of 44° and a low of 27°.
What is the hottest month in Bon Air?
July, with a typical high of 84° and a low of 65°. About 40 days a year reach 90°.
How much snow does Bon Air get?
About 5 inches in a normal winter, most of it in February.
When is the first frost in Bon Air?
In half of years the first 32° night comes by October 23, and the last spring frost by April 15.
What is the rainiest month in Bon Air?
December, with 6.4 inches of rain and melted snow. The year totals 62 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Bon Air itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Sparta Wastewater Plant, TN (6 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.