Oak Ridge Atdd, Tennessee climate: Climate normals at a NOAA weather station
Oak Ridge Atdd's normal year runs from 29°F January nights to 87°F July afternoons, with 59.7 inches of precipitation and 4 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 14.8°C, January lows of −2°C, July highs of 31°C, 1,516 mm of precipitation a year.
- NOAA stationOak Ridge Atdd
- Station IDUSW00003841
- Location36.00°N 84.25°W
- Elevation905 ft (276 m)
On October 23, the normal high in Oak Ridge Atdd is 69°F and the normal low 45°F, and the chance of measurable rain or snow is 29%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Oak Ridge Atdd.
- Jan 47° 29°
- Feb 51° 32°
- Mar 61° 39°
- Apr 70° 47°
- May 78° 56°
- Jun 84° 64°
- Jul 87° 68°
- Aug 87° 67°
- Sep 81° 61°
- Oct 71° 48°
- Nov 59° 37°
- Dec 49° 32°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Oak Ridge Atdd each month?
July is the warmest month, with normal highs of 87°F; January the coldest, with normal lows of 29°F. The most precipitation falls in February (5.93 in), the least in October (3.29 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 47°F | 29°F | 37.9°F | 5.50 | 1.8 | 12 | <1 | 20 | 10 h |
| February | 51°F | 32°F | 41.7°F | 5.93 | 1.4 | 12 | <1 | 16 | 10 h 50 min |
| March | 61°F | 39°F | 49.7°F | 5.55 | 0.6 | 12 | <1 | 9 | 11 h 50 min |
| April | 70°F | 47°F | 58.6°F | 5.58 | 0.0 | 11 | <1 | 2 | 13 h |
| May | 78°F | 56°F | 66.9°F | 4.50 | 0.0 | 12 | 1 | <1 | 14 h |
| June | 84°F | 64°F | 74.1°F | 4.76 | 0.0 | 12 | 7 | <1 | 14 h 40 min |
| July | 87°F | 68°F | 77.5°F | 5.90 | 0.0 | 13 | 14 | <1 | 14 h 20 min |
| August | 87°F | 67°F | 76.8°F | 3.72 | 0.0 | 10 | 12 | <1 | 13 h 30 min |
| September | 81°F | 61°F | 70.8°F | 4.13 | 0.0 | 8 | 5 | <1 | 12 h 30 min |
| October | 71°F | 48°F | 59.7°F | 3.29 | 0.0 | 8 | <1 | 1 | 11 h 20 min |
| November | 59°F | 37°F | 48.1°F | 5.00 | 0.0 | 9 | <1 | 11 | 10 h 20 min |
| December | 49°F | 32°F | 40.9°F | 5.84 | 0.6 | 12 | <1 | 17 | 9 h 40 min |
| Year (annual) | 69°F | 48°F | 58.6°F | 59.70 | 4.4 | 132 | 39 | 75 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 8°C | −2°C | 3.3°C | 140 mm | 5 cm |
| February | 11°C | 0°C | 5.4°C | 151 mm | 4 cm |
| March | 16°C | 4°C | 9.8°C | 141 mm | 2 cm |
| April | 21°C | 8°C | 14.8°C | 142 mm | 0 cm |
| May | 25°C | 13°C | 19.4°C | 114 mm | 0 cm |
| June | 29°C | 18°C | 23.4°C | 121 mm | 0 cm |
| July | 31°C | 20°C | 25.3°C | 150 mm | 0 cm |
| August | 30°C | 19°C | 24.9°C | 94 mm | 0 cm |
| September | 27°C | 16°C | 21.6°C | 105 mm | 0 cm |
| October | 22°C | 9°C | 15.4°C | 84 mm | 0 cm |
| November | 15°C | 3°C | 8.9°C | 127 mm | 0 cm |
| December | 10°C | 0°C | 4.9°C | 148 mm | 2 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00003841; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
Which months are mildest at Oak Ridge Atdd?
Normal highs sit between 65°F and 85°F in April, May, June, September and October. Of those, September has the fewest days with rain (8).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00003841.
When is the last frost at Oak Ridge Atdd?
In Oak Ridge Atdd, the last spring frost (32°F) comes after April 5 in half of years and after April 19 in one year in ten; the first autumn frost comes before November 1 in half of years and before October 19 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- April 51 year in 10 after April 19; 9 in 10 after March 19
- First autumn frost, half of years before
- November 11 year in 10 before October 19; 9 in 10 before November 13
NOAA puts the median frost-free season at 210 days, and the season without a hard freeze (28°F) at 235 days.
A hard freeze (28°F) comes after March 23 in half of springs and before November 11 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Oak Ridge Atdd in zone 7b in ZIP code 37830, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 7b: the coldest night of a typical year reaches 8°F (28 complete years).
Frost dates for every NOAA station in Tennessee · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00003841; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get at Oak Ridge Atdd?
In a normal year in Oak Ridge Atdd, 39 days a year reach 90°F (1 of them 100°F or more), 75 nights fall to 32°F or colder and 132 days bring measurable precipitation.
- Days at 90°F or more
- 39a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 75a normal year
- Days that stay below freezing
- 4high of 32°F or less
- Days with 0.01 inch of precipitation
- 132a normal year
- Days with 1 inch of snow or more
- 2a normal year
The highest temperature in this station's record (since 1948) is 105°F, on July 28, 1952; the lowest is −17°F, on January 21, 1985.
The wettest calendar year on that record is 2003, with 78.18 in; the snowiest season is 1959–60, with 41.4 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USW00003841; records: ACIS (NOAA Regional Climate Centers), station USW00003841. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Oak Ridge Atdd?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds at Oak Ridge Atdd, 4.2 kWh per square metre a day. August is the sunniest month (79%) and February the cloudiest (61%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 63% | 2.2 |
| February | 61% | 2.8 |
| March | 66% | 3.9 |
| April | 72% | 5.2 |
| May | 73% | 5.7 |
| June | 78% | 6.2 |
| July | 76% | 5.9 |
| August | 79% | 5.5 |
| September | 77% | 4.7 |
| October | 74% | 3.6 |
| November | 73% | 2.6 |
| December | 63% | 1.9 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How many heating and cooling degree days does Oak Ridge Atdd record?
A normal year at Oak Ridge Atdd brings 3,732 heating degree days, 31% fewer than the median U.S. place (5,373), and 1,414 cooling degree days, 56% more than the median (908). Five months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 4,405 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 840 | 0 |
| February | 651 | 0 |
| March | 478 | 4 |
| April | 219 | 27 |
| May | 62 | 121 |
| June | 4 | 275 |
| July | 0 | 389 |
| August | 0 | 366 |
| September | 21 | 195 |
| October | 199 | 35 |
| November | 509 | 2 |
| December | 749 | 0 |
| Year (annual) | 3,732 | 1,414 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00003841. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Have recent years at Oak Ridge Atdd been warmer than normal?
2024 averaged 60.1°F, 1.5°F above the 1991-2020 normal of 58.6°F. 4 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 60.3°F | +1.7°F | 57.03 | – |
| 2022 | 60.0°F | +1.4°F | 59.15 | – |
| 2023 | 59.7°F | +1.1°F | 44.80 | – |
| 2024 | 60.1°F | +1.5°F | 50.51 | – |
Over 70 complete years from 1951 to 2024, the station's annual mean temperature rose at a fitted 4.3°F per century (+0.24°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USW00003841; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Oak Ridge Atdd's climate compare?
Oak Ridge Atdd is warmer than 65 of the 116 places with their own NOAA record in Tennessee, and wetter than 93. Across the 7,247 U.S. stations with normals, its annual mean of 58.6°F is warmer than 71%.
In the Köppen classification computed from these normals, Oak Ridge Atdd is Cfa: temperate, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Oak Ridge Atdd share this climate record?
2 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Oliver Springs, TN3,433 people · 5 mi NW
- Coalfield, TN2,782 people · 11 mi W
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Oak Ridge Atdd's climate
What is the coldest month at Oak Ridge Atdd?
January, with a normal high of 47°F and a normal low of 29°F. The warmest is July (87°F by day, 68°F at night).
Does it snow at Oak Ridge Atdd?
Yes: 4 inches in a normal year, falling on 3 days with 0.1 inch or more, the most in January (1.8 inches).
What is the rainiest month at Oak Ridge Atdd?
February, with 5.93 in of precipitation in a normal year; the driest is October with 3.29 in.
What plant hardiness zone is Oak Ridge Atdd in?
The USDA's 2023 map puts Oak Ridge Atdd in zone 7b in ZIP code 37830, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 8°F (28 years, 1991-2020): zone 7b.
How late can frost come at Oak Ridge Atdd?
In half of years the last 32°F night comes after April 5; in one year in ten it comes after April 19. Waiting until April 19 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Tennessee climateThe statewide normals and every place in the state
- Oak Ridge, TN2 miles from this station, 59.8°F a year
- Lenoir City, TN15 miles from this station, 59.1°F a year
- Knoxville Experiment Station, TN18 miles from this station, 57.9°F a year
- Norris, TN18 miles from this station, 55.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made