Karns, Tennessee Weather
Fireflies pulse through the magnolias. Day 77 of spring. Read this microseason across nine climate regions →
Karns weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——81°54°—
- FridayJun 5Overcast——84°62°+3°
- SaturdayJun 6Overcast——85°64°+1°
- SundayJun 7Overcast——88°64°+3°
- MondayJun 8Light Showers34%0.18″75°65°-13°
- TuesdayJun 9Drizzle36%0.02″76°63°+1°
- WednesdayJun 10Overcast29%—81°61°+5°
Ozone at AQI 88 — peak already passed at 1 PM under clear skies. AQI up 41 in the last 6 hours — air quality is degrading. Levels should ease through evening.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 88 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 88
- UV peak
- 3.0 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 88
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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 3:52 AM
- Moonset
- 1:49 PM
- In sign
- ♒︎ Aquarius
Fireflies pulse through the magnolias
Karns at a glance
- Today vs. normal: 81°F — typical for the season
- Last frost: March 23 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 4, 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 General Thunderstorms category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
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.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | lettuce, peas, spinach, radishes | — |
| April | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | — |
| May | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | — | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | — | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | fall brassicas, garlic (overwinter), carrots | — |
| December | — | — |
A year in weather
Karns's warmest month is July (~77°F mean) and its coldest is January (~37°F). Rainfall peaks in December (5.9 inches) and bottoms out in October (3.0 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 37° | 5.2″ | 9 |
| February | 41° | 5.1″ | 8 |
| March | 49° | 5.3″ | 9 |
| April | 57° | 5.3″ | 8 |
| May | 66° | 4.5″ | 8 |
| June | 74° | 4.0″ | 7 |
| July | 77° | 5.8″ | 9 |
| August | 76° | 3.4″ | 7 |
| September | 71° | 4.1″ | 6 |
| October | 59° | 3.0″ | 5 |
| November | 48° | 4.1″ | 7 |
| December | 40° | 5.9″ | 9 |
Regional context
Karns sits within a humid subtropical climate region — a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: Nashville, TN, Memphis, TN, Knoxville, TN, Chattanooga, TN, Clarksville, TN.
Frequently asked
- When does it freeze in Karns?
- Karns's last spring frost typically falls around mid-March, and the first fall frost arrives around mid-December.
- What is the rainy season in Karns?
- December is the wettest month with about 5.9 inches of rain on average; the city receives roughly 56 inches annually.
- What is the warmest month in Karns?
- July is typically warmest, averaging about 77°F.
- What is the coldest month in Karns?
- January is typically coldest, averaging about 37°F.
- When can I start a vegetable garden in Karns?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-March); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does Karns get?
- Karns averages about 90 rainy days per year.
- What hardiness zone is Karns?
- Karns's USDA hardiness zone is determined by its lowest average winter temperature; check the USDA's online lookup with the city ZIP for the current zone designation.
Climate
Karns, Tennessee sits in a humid subtropical climate zone. January means hover near 37°F while July averages 77°F — a 40°F seasonal swing.
Across the year, Karns receives about 56 inches of precipitation spread over roughly 90 rainy days.
The rhythm of the year is set by latitude (36.0°N), proximity to large water bodies, and elevation — all of which shape what grows here, when frost is likely, and what the weather story looks like day to day.