Photo: Brian Stansberry · CC BY 4.0Alcoa’s winters are milder and less snowy than most of the U.S.
A typical July afternoon reaches 88°, a January night drops to 30°, and about 5 inches of snow falls in a normal winter.
A year in Alcoa at a glance
Each month’s typical high and low, and what it brings.
What stands out about Alcoa’s climate
Compared with towns across the U.S., with Alcoa’s place in Tennessee beside it.
What a year in Alcoa feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 215 frost-free days a year
In half of years the last 32° night comes by April 1 and the first by November 2. Frost and day counts come from NOAA’s station at Knoxville Mcghee Tyson Airport, 1.1 miles from the town’s center, at about the same height.
The 2023 USDA map puts Alcoa’s center in zone 7b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 9°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 5 inches of snow a winter
Snow, measured at Knoxville Mcghee Tyson Airport, falls mostly in January. Precipitation (rain plus melted snow) adds up to 54 inches a year; December is the wettest month and October the driest. Rain or snow falls on about 129 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Alcoa
69% of the work is heating. Months averaging under 55° run from November through March.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Knoxville Mcghee Tyson Airport.
Living with Alcoa’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
215 frost-free days in zone 7b. The last frost comes by Apr 1 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Nov 2.
Months with highs of 62–84° and lows of 40° or more: April, May, September and October. 4.1 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Alcoa from natural hazards, river flooding is the largest share (43%); heat waves, cold waves, winter storms and ice storms together are 9%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Alcoa and its neighbors
Every town next door is within a degree of Alcoa in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Alcoa’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Alcoa, TN | 30° | 88° | 54" | 4.6" |
| Murray, KY | 27° | 89° | 54" | 6.5" |
| Suffolk, VA | 30° | 89° | 50" | 4.1" |
| Winterville, NC | 33° | 90° | 53" | 3.3" |
| Fairburn, GA | 33° | 89° | 52" | 2.2" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Alcoa averaged 0.9° warmer than the 1900s. The biggest change is in December (+1.9°).
A smaller shift than in 85% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Alcoa compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Alcoa’s place among Tennessee’s.
Alcoa weather by month
Highs, lows and precipitation from NOAA’s grid at Alcoa’s center; snow, wet days and snow on the ground from Knoxville Mcghee Tyson Airport. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 48° | 30° | 4.9" | 1.7" | 12 | 2 | 31° – 46° |
| February | 53° | 33° | 5.0" | 1.4" | 12 | 1 | 32° – 50° |
| March | 62° | 39° | 5.1" | 0.9" | 13 | 0 | 44° – 60° |
| April | 71° | 47° | 4.8" | 0.0" | 11 | 0 | 54° – 64° |
| May | 79° | 56° | 4.1" | 0.0" | 11 | 0 | 62° – 73° |
| June | 86° | 64° | 4.5" | 0.0" | 12 | 0 | 71° – 79° |
| July | 88° | 68° | 4.9" | 0.0" | 12 | 0 | 74° – 82° |
| August | 88° | 67° | 3.9" | 0.0" | 10 | 0 | 73° – 83° |
| September | 83° | 61° | 3.8" | 0.0" | 8 | 0 | 68° – 77° |
| October | 72° | 48° | 3.1" | 0.0" | 8 | 0 | 57° – 65° |
| November | 61° | 38° | 4.3" | 0.1" | 9 | 0 | 43° – 54° |
| December | 51° | 33° | 5.4" | 0.5" | 12 | 0 | 33° – 52° |
| Year | 70° | 48° | 53.6" | 4.6" | 129 | 3 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 33° to 52°. June is the most reliable, staying within 8°.
Where Alcoa’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Alcoa’s center.
- Snow: Knoxville Mcghee Tyson Airport (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Knoxville Mcghee Tyson Airport, 1.1 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Alcoa’s climate
What is the weather like in Alcoa?
A typical July afternoon reaches 88°, a January night drops to 30°, and about 5 inches of snow falls in a normal winter. Milder January nights than 72% of U.S. towns; hotter July afternoons than 69% of U.S. towns.
How cold does it get in Alcoa in winter?
January nights average 30°. About 67 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 31°.
How much snow does Alcoa get?
About 4.6 inches in a normal winter at Knoxville Mcghee Tyson Airport, most of it in January, with snow on the ground about 3 days a year.
How hot does it get in Alcoa?
July, with a typical high of 88° and a low of 68°. About 37 days a year reach 90° (Knoxville Mcghee Tyson Airport).
When is the first and last frost in Alcoa?
In half of years the last spring frost (32°) comes by April 1 and the first fall frost by November 2, about 215 frost-free days, at Knoxville Mcghee Tyson Airport.
What growing zone is Alcoa in?
Zone 7b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 9°.
What is the best time of year to visit Alcoa?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Alcoa getting warmer?
Yes: 1991–2020 averaged 0.9° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 85% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Alcoa.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.