Photo: Brian Stansberry · CC BY 3.0Harriman sits near the top of U.S. towns for precipitation, with 58 inches a year
January mornings start at about 29°. Winters are mild: January nights here are milder than in 71% of U.S. towns. Warming shows here too: 0.8° more than in 1901–2000, led by December. Warm coats and heating bills mark the months from November to March, when means dip under 50°.
A year in Harriman at a glance
Each month’s typical high and low, and what it brings.
What stands out about Harriman’s climate
Compared with towns across the U.S., with Harriman’s place in Tennessee beside it.
What a year in Harriman 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 3 and the first by November 4. Frost and day counts come from NOAA’s station at Kingston, TN, 5 miles from the town’s center, at about the same height.
The 2023 USDA map puts Harriman’s center in zone 7b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 8°. 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 2 inches of snow a winter
Snow, measured at Kingston, TN, falls mostly in January. Precipitation (rain plus melted snow) adds up to 58 inches a year; December is the wettest month and October the driest. Rain or snow falls on about 115 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Harriman
72% 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 Kingston, TN.
Living with Harriman’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 3 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 4.
Months with highs of 62–84° and lows of 40° or more: April, May, September and October. 3.4 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Harriman from natural hazards, river flooding is the largest share (50%); heat waves, cold waves, winter storms and ice storms together are 23%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Harriman and similar climates
TownRatings has no climate map of the towns around Harriman yet.
Climates most like Harriman’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 |
|---|---|---|---|---|
| Harriman, TN | 29° | 88° | 58" | 1.8" |
| Arab, AL | 32° | 88° | 59" | 0.7" |
| Bremen, GA | 31° | 88° | 55" | 0.6" |
| Ripley, MS | 31° | 90° | 58" | 1.6" |
| Mayfield, KY | 27° | 89° | 52" | 1.4" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Harriman averaged 0.8° warmer than the 1900s. The biggest change is in December (+1.8°).
A smaller shift than in 90% 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 Harriman compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Harriman’s place among Tennessee’s.
Harriman weather by month
Highs, lows and precipitation from NOAA’s grid at Harriman’s center; snow, wet days and snow on the ground from Kingston, TN. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 47° | 29° | 5.0" | 1.1" | 10 | 1 | 29° – 45° |
| February | 52° | 32° | 5.1" | 0.6" | 10 | 0 | 31° – 49° |
| March | 61° | 38° | 5.5" | 0.0" | 11 | 0 | 43° – 60° |
| April | 71° | 45° | 5.1" | 0.0" | 10 | 0 | 53° – 64° |
| May | 78° | 55° | 4.3" | 0.0" | 10 | 0 | 60° – 72° |
| June | 85° | 63° | 4.7" | 0.0" | 11 | 0 | 70° – 78° |
| July | 88° | 67° | 5.0" | 0.0" | 11 | 0 | 74° – 80° |
| August | 87° | 66° | 3.8" | 0.0" | 9 | 0 | 72° – 82° |
| September | 82° | 59° | 4.3" | 0.0" | 7 | 0 | 67° – 76° |
| October | 71° | 47° | 3.5" | 0.0" | 7 | 0 | 55° – 64° |
| November | 60° | 37° | 4.8" | 0.0" | 9 | 0 | 42° – 53° |
| December | 51° | 32° | 6.3" | 0.1" | 10 | 0 | 32° – 52° |
| Year | 69° | 47° | 57.5" | 1.8" | 115 | 1 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 32° to 52°. July is the most reliable, staying within 7°.
Where Harriman’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 Harriman’s center.
- Snow: Kingston, TN.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Kingston, TN, 5 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 Harriman’s climate
What is the weather like in Harriman?
A typical July afternoon reaches 88°, a January night drops to 29°, and about 2 inches of snow falls in a normal winter. Milder January nights than 71% of U.S. towns; hotter July afternoons than 66% of U.S. towns.
How cold does it get in Harriman in winter?
January nights average 29°. About 78 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 29°.
How much snow does Harriman get?
About 1.8 inches in a normal winter at Kingston, TN, most of it in January, with snow on the ground about 1 days a year.
How hot does it get in Harriman?
July, with a typical high of 88° and a low of 67°. About 37 days a year reach 90° (Kingston, TN).
When is the first and last frost in Harriman?
In half of years the last spring frost (32°) comes by April 3 and the first fall frost by November 4, about 215 frost-free days, at Kingston, TN.
What growing zone is Harriman in?
Zone 7b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 8°.
What is the best time of year to visit Harriman?
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 Harriman getting warmer?
Yes: 1991–2020 averaged 0.8° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 90% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Harriman.
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.