Weather StoryAlmanac, microseasons, and the day's weather story.

Karns, Tennessee Weather

Cicadas claim the scorching afternoon. Day 15 of summer. Read this microseason across nine climate regions →

Karns weather forecast — hour by hour, 7-day outlook, NOAA radar

Karns, TN
Saturday, July 4 at 10:09 PM
81
°
Clear
Feels like
87°
Humidity
67%
Wind
4 mph
Sunrise
2:24 AM
Sunset
4:56 PM
Karns, TN
Hour by hour · 24h
24-Hour ForecastKarns, TN: 24-hour forecast. Temperatures range from 73 to 94 degrees Fahrenheit with a 26% chance of precipitation at 9 PM.
L 73°H 94°
Karns, TN
7-day forecast
  1. Today
    Jul 4
    Overcast
    18%
    —
    91°70°—
  2. Sunday
    Jul 5
    Rain
    26%
    0.16″
    94°73°+3°
  3. Monday
    Jul 6
    Showers
    66%
    0.29″
    91°70°-3°
  4. Tuesday
    Jul 7
    Light Showers
    41%
    —
    92°69°+1°
  5. Wednesday
    Jul 8
    Partly Cloudy
    13%
    —
    90°67°-2°
  6. Thursday
    Jul 9
    Overcast
    21%
    —
    93°68°+3°
  7. Friday
    Jul 10
    Showers
    55%
    0.29″
    93°68°0°
Karns, TN
Next 24 hours · Warm now
HOT 90°68°83°98°6p12a6a12pnow 81°high 94°low 73°PRECIP %
Karns, TN
Anemometer · 24h winds · from true
NESW
From · True
WNW
287° · steady
Direction
WNW
287°
Sustained
4
mph
Gust
6
mph
Peak 24h
18
avg 3
Beaufort · 2 · LIGHT BRZ
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
avg 3 · pk 18 @ 11:00p
010MPHB1B2B3B4-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 1210SUSTGUST
−24h−18h−12h−6hnow
A whisper of wind — leaves barely shift on the trees.
Karns, TN
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
980.7
+0.8 mb in 3h · rising · 28.96 inHg
Now
980.7
mb
3h
+0.8
mb
12h
-3.8
mb
24h
-3.5
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 980–985
975980985990-21h-18h-15h-12h-9h-6h-3h-24hNOW984.8979.9980.7
−24h−18h−12h−6hnow
Deep low — expect rough seas, strong wind, and persistent rain.
Karns, TN
Air quality
80
AQI
Moderate
↑+33 in 6h

AQI 80 (Moderate), driven by PM2.5. AQI up 33 in the last 6 hours — air quality is degrading. PM2.5 at 11.4 µg/m³ (AQI 55) with a 0.93 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.

OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.

PM 2.5DRIVERGood
11.4μg/m³
PM 10Good
12μg/m³
NO₂Good
9μg/m³
OzoneUnhealthy SG
102μg/m³
UV IndexLow
0.0

What's driving it

Ozone × UV × Sky

Ozone at AQI 48. Overcast through the UV peak window (cloud cover ~76%) — afternoon ozone should stay flat.

Present
AQI 48
UV peak
0.0 at 1 PM
Sky at peak
overcast
Projected peak
AQI 6

PM × Wind × Precip

PM2.5 at 11.4 µg/m³ (AQI 55) with a 0.93 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.

PM2.5/PM10
0.93
Wind
calm
Recent rain
0h in last 6h
Pattern
stagnant smoke

Trends

Seven days of AQI and PM2.5.

Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).

7-DAY AQI TREND50100SUNMONTUEWEDTHUFRISATSUN7-DAY PM2.5 TREND · μg/m³410
Karns, TN
Sky cover · visibility · 24h
Cloud cover
0%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
50.4mi
UNLIMITED
76 mi0 mi−24h−18h−12h−6hnow
Earth · GOES-19 ABI
Full Disk · Visible · GeoColor
GOES-19 full disk Visible · GeoColor
True-color daytime, blue/IR sandwich at night
02:09 UTC · Karns, TN · NOAA NESDIS / STAR · up to 10848 px
Continental US · GOES-19 ABI
CONUS Sector · Visible · GeoColor
GOES-19 CONUS Visible · GeoColor
Daytime true-color, blue-light/IR sandwich at night
02:09 UTC · Karns, TN · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Karns, TN
Satellite · infrared · animated
Karns, TN
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Karns, TN
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:55 AM
Sunrise
2:24 AM
Daylight
14h 32m
Sunset
4:56 PM
Civil dusk
9:28 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Karns, TN
The moon
Waning Gibbous
77% illuminated
Moonrise
11:51 PM
Moonset
11:49 AM
In sign
♓︎ Pisces
Karns, TN
Microseason
Jul 1–5

Cicadas claim the scorching afternoon

plant
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Karns at a glance

  • Today vs. normal: 5°F above the seasonal normal for this latitude
  • Last frost: March 23 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

16-Day Forecast — Karns

  1. Sat91°70°18%
  2. Sun94°72°26%
  3. Mon91°70°66%
  4. Tue92°69°41%
  5. Wed90°67°13%
  6. Thu93°68°21%
  7. Fri93°68°55%
  8. Sat80°69°60%
  9. Sun75°67°37%
  10. Mon86°64°22%
  11. Tue87°67°14%
  12. Wed90°68°19%
  13. Thu77°68°35%
  14. Fri89°66°32%
  15. Sat84°70°47%
  16. Sun95°70°62%

Forecast data from Open-Meteo (CC BY 4.0).

Right now in the garden

Peak growing season

As of July 5, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.

SPC Convective Outlook

Storm Prediction Center — Karns

SPC has placed Karns in the Marginal Risk category for severe thunderstorms tomorrow.

  • TODAYTSTMGeneral Thunderstorms
  • TOMORROWMRGLMarginal Risk
  • DAY 3TSTMGeneral Thunderstorms

Isolated severe storms possible. Limited threat for hail or damaging wind.

Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.

January 1–5: Frost quiets the live oaks.January 6–10: Still water thickens with ice.January 11–15: Springs begin to move beneath ice.January 16–20: Cardinal dawn calls grow bolder.January 21–25: Late January thaw pulses.January 26–31: Last freeze locks the land.February 1–5: February's lengthening light.February 6–10: Warming winds thaw the margin.February 11–15: Magnolia blooms break the gray.February 16–20: Mockingbirds resume the dawn chorus.February 21–25: Rain replaces the last snow.February 26–28: Mist clings to greening valleys.March 1–5: The green pulse awakens.March 6–10: Hibernators emerge to call.March 11–15: Dogwood and redbud ignite.March 16–20: Swallowtails emerge from winter silk.March 21–25: Light crowns the dogwood canopy.March 26–31: Redbud cascades over the thaw.April 1–5: Thunder announces the wet season.April 6–10: Barn swallows carve the warming sky.April 11–15: Magnolia blooms and falls in a breath.April 16–20: First rainbows arch over thunderheads.April 21–25: Reeds push through marsh water.April 26–30: Frost retreats; seedlings rise free.May 1–5: Warblers flood the canopy in waves.May 6–10: Tulip poplar lights the forest crown.May 11–15: Shad pulse upstream through rapids.May 16–20: Roses open on the Piedmont edge.May 21–25: Fireflies scout the humid dusk.May 26–31: Frog choruses rise from every wetland.June 1–5: Fireflies pulse through the magnolias.June 6–10: Kudzu climbs deeper into green.June 11–15: Sun climbs to its northern throne.June 16–20: Heat settles and the rain begins.June 21–25: The longest day turns toward shadow.June 26–30: Fireflies drift through Spanish moss.July 1–5: Cicadas claim the scorching afternoon.July 6–10: Thunderheads boil and break at dusk.July 11–15: Thunder builds each drowsy afternoon.July 16–20: Cicadas claim the long noon.July 21–25: Dog days drape the earth in haze.July 26–31: Katydids begin their rasping chorus.August 1–5: Dusk arrives one minute earlier each night.August 6–10: Meteorological summer's turning page.August 11–15: Cool winds gather at the margins.August 16–20: Dog-day cicadas rise.August 21–25: Heat breaks in creek beds.August 26–31: Monarchs gather strength.September 1–5: Harvests begin in earnest.September 6–10: Dew beads on resurrection fern.September 11–15: Raptors trail the thermals.September 16–20: Day and dark find balance.September 21–25: Thunder quiets the land.September 26–30: Insects retreat below.October 1–5: Swamp waters recede.October 6–10: Maples ignite the ridge.October 11–15: Asters crown the meadows.October 16–20: Crickets sing at dusk.October 21–25: Frost paints the garden.October 26–31: Light rains whisper down.November 1–5: Sweetgum Turns Crimson.November 6–10: Camellia Blooms Break Through.November 11–15: Earth Stiffens Underfoot.November 16–20: Bare Limbs Hold the Light.November 21–25: First Frost Grips the High Ground.November 26–30: North Wind Strips the Last Leaves.December 1–5: Darkness Falls Before Dinner.December 6–10: Winter Locks the Land.December 11–15: Wildlife Retreats to Shelter.December 16–20: Ice Edges Deepen Inward.December 21–25: The Sun Begins its Return.December 26–31: The Year Turns in Silence.🌱February 14 — First skunk-cabbage spathes thaw their way up☀️March 20 — Spring equinox — day and night balance🌸April 5 — Cherry blossoms peak in the parks🐦May 10 — Warbler migration peaks along the coast✨May 25 — First fireflies scout the meadows at dusk🌞June 21 — Summer solstice — longest day🦗July 25 — Peak cicada chorus in the afternoons🌊August 18 — Warmest sea-surface temperatures of the year🍂September 22 — Autumn equinox — the slow turn❄️October 25 — First widespread frost in the suburbs🍁November 10 — Peak leaf color across the Hudson Valley🌙December 21 — Winter solstice — longest night

Microseason · July 1–5

Cicadas claim the scorching afternoon

Dog-day cicadas emerge in waves, their rasp dominating every sunny hour; heat peaks above 90 degrees daily.

Day 186 of 365 · Wedge 37 of 72

The solar year drawn as a wheel of 72 five-day windows. Each wedge is one microseason; the four colored arcs mark winter, spring, summer, and autumn; the small icons sit at notable phenological events. The crimson pointer creeps clockwise as the year turns.

Planting calendar

MonthPlantHarvest
January——
February——
Marchlettuce, peas, spinach, radishes—
Aprillettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash—
Maytomatoes, peppers, beans, squashlettuce, peas, radishes
Junetomatoes, peppers, beans, squashlettuce, peas, radishes
July—tomatoes, beans, summer squash
August—tomatoes, beans, summer squash
September—tomatoes, beans, summer squash
Octoberfall brassicas, garlic (overwinter), carrotswinter squash, tomatoes (last)
Novemberfall brassicas, garlic (overwinter), carrots—
December——

A year in weather

The year in Karns tops out in July (~77°F) and dips lowest in January (~37°F), with December wettest at 4.9 inches and October driest at 2.4 inches.

MonthMean tempPrecipRainy days
January37°4.6″16
February40°4.1″15
March48°4.8″17
April57°4.0″16
May65°3.5″17
June74°3.8″17
July77°4.5″22
August76°4.4″22
September71°2.7″14
October60°2.4″10
November48°3.7″13
December40°4.9″16

Regional context

Drawing on NOAA NCEI 1991-2020 normals, Karns's January averages 37°F and July 77°F — 41°F apart — while precipitation totals roughly 47.5 inches over some 197 days.

No season owns Karns's rain: December reaches 4.9 inches across 16.2 days and October keeps 2.4 inches on 9.8, an even spread through Karns's year. That lines Karns up with places like Powell, TN, Farragut, TN and Clinton, TN, fed by overlapping storm tracks.

The cool-season window in Karns starts at mid-March, when nights stop freezing — think peas, lettuce, spinach, and radishes. Hold Karns's tender crops — tomatoes, peppers, basil — until 10-14 days past Karns's last frost. Karns's window closes around mid-December as overnight lows return below freezing. Within Karns, cold-air pooling chills low spots by 5-10°F, shifting Karns's local frost dates.

Similar climates: Powell, TN, Farragut, TN, Clinton, TN, Knoxville, TN, Oak Ridge, TN.

Frequently asked

When does it freeze in Karns?
Frost typically leaves Karns by mid-March and returns to Karns near mid-December.
What is the rainy season in Karns?
December is the wettest month in Karns, about 4.9 inches on average; the year totals roughly 48 inches.
What is the warmest month in Karns?
Karns peaks in July, when the mean runs near 77°F.
What is the coldest month in Karns?
January is Karns's coldest month, averaging about 37°F.
When can I start a vegetable garden in Karns?
Hardy spring crops go in near mid-March in Karns; tender peppers and squash wait 10–14 days.
How many rainy days does Karns get?
Expect roughly 197 wet days a year in Karns.
What hardiness zone is Karns?
With January around 37°F, Karns's zone reflects that minimum — the USDA ZIP map confirms Karns's band.
What is the 10-day forecast for Karns?
Karns's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
Will it rain this week in Karns?
See this week's day-by-day rain chances for Karns in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Karns?
Current conditions for Karns and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Karns forecast updated?
The Karns forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Karns?
Today's sunrise and sunset times for Karns are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
How accurate is the weather forecast for Karns?
The next few days in Karns's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Set in a humid subtropical zone, Karns, Tennessee swings from 37°F in the heart of winter to 77°F at midsummer — a 40°F arc.

In a typical year Karns records about 48 inches of precipitation on around 197 days.

Karns's 40°F range, set by its 36.0°N position, drives frost timing and what thrives in Karns.

All cities in Tennessee →

Knoxville, TN weather →

ZIP codes in Karns

  • 37931

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.