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.
A year in Bon Air at a glance
Each month’s typical high and low, and what it brings.
What stands out about Bon Air’s climate
Read from where Bon Air sits among Tennessee’s towns. The page puts what stands out first.
What a year in Bon Air feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
5 inches of snow, 62 of rain and melt
December is the wettest month and October the driest. Rain or snow falls on about 135 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
About 191 frost-free days a year
In half of years the last 32° night comes by April 15 and the first by October 23.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
Living with Bon Air’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
191 frost-free days. The last frost comes by Apr 15 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 23.
About 5" in a normal winter.
Months averaging under 55° run from November through March. Heating is 74% of the year’s heating-and-cooling load.
About 40 days a year reach 90°, and July afternoons average 84°.
The nicest months are April, May, June, July, August, September and October. 1.2 miles of trails are waiting.
Parks & trails →Normals are averages. Ice storms, nor’easters, floods and heat waves are on the natural hazards page.
Natural hazards →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°).
A smaller shift than in 85% of U.S. towns.
Change by month
How Bon Air compares
Against every U.S. town on TownTapestry, each counted once, with its place in Tennessee.
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 |
Heating and cooling a home in Bon Air
74% of the work is heating.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. Source: NOAA station normals.
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average 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.
Neighbors talk weather
Gardens, snow, and the best days of the year in Bon Air.
Your answer becomes a post in Town Square.
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. Today’s forecast: National Weather Service.