Jamestown, Tennessee climate: Normal weather by month, frost dates and records
Jamestown's normal year runs from 25°F January nights to 84°F July afternoons, with 59.2 inches of precipitation and 19 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.9°C, January lows of −4°C, July highs of 29°C, 1,503 mm of precipitation a year.
- NOAA stationJamestown
- Station IDUSC00404590
- Location36.43°N 84.94°W
- Elevation1,690 ft (515 m)
- From the centerunder 1 mile
- Population2,102
On October 23, the normal high in Jamestown is 67°F and the normal low 41°F, and the chance of measurable rain or snow is 31%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Jamestown.
- Jan 45° 25°
- Feb 49° 27°
- Mar 58° 34°
- Apr 68° 42°
- May 75° 53°
- Jun 82° 60°
- Jul 84° 64°
- Aug 84° 63°
- Sep 78° 56°
- Oct 69° 44°
- Nov 57° 34°
- Dec 48° 28°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Jamestown each month?
July is the warmest month, with normal highs of 84°F; January the coldest, with normal lows of 25°F. The most precipitation falls in December (6.26 in), the least in October (3.18 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 45°F | 25°F | 34.7°F | 5.03 | 3.2 | 14 | <1 | 23 | 10 h |
| February | 49°F | 27°F | 37.9°F | 4.86 | 5.7 | 13 | <1 | 21 | 10 h 50 min |
| March | 58°F | 34°F | 46.0°F | 5.52 | 4.8 | 13 | <1 | 15 | 11 h 50 min |
| April | 68°F | 42°F | 54.8°F | 5.46 | 0.1 | 12 | <1 | 5 | 13 h 10 min |
| May | 75°F | 53°F | 63.6°F | 5.31 | 0.0 | 13 | <1 | 1 | 14 h |
| June | 82°F | 60°F | 71.1°F | 5.52 | 0.0 | 12 | 1 | <1 | 14 h 40 min |
| July | 84°F | 64°F | 74.1°F | 5.29 | 0.0 | 12 | 3 | <1 | 14 h 30 min |
| August | 84°F | 63°F | 73.5°F | 4.64 | 0.0 | 10 | 3 | <1 | 13 h 40 min |
| September | 78°F | 56°F | 67.0°F | 4.00 | 0.0 | 9 | 1 | <1 | 12 h 30 min |
| October | 69°F | 44°F | 56.2°F | 3.18 | 0.0 | 9 | <1 | 4 | 11 h 20 min |
| November | 57°F | 34°F | 45.6°F | 4.11 | 0.3 | 10 | <1 | 15 | 10 h 20 min |
| December | 48°F | 28°F | 38.2°F | 6.26 | 4.8 | 14 | <1 | 21 | 9 h 40 min |
| Year (annual) | 66°F | 44°F | 55.2°F | 59.18 | 18.9 | 140 | 9 | 103 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 7°C | −4°C | 1.5°C | 128 mm | 8 cm |
| February | 9°C | −3°C | 3.3°C | 123 mm | 14 cm |
| March | 14°C | 1°C | 7.8°C | 140 mm | 12 cm |
| April | 20°C | 6°C | 12.7°C | 139 mm | 0 cm |
| May | 24°C | 11°C | 17.6°C | 135 mm | 0 cm |
| June | 28°C | 16°C | 21.7°C | 140 mm | 0 cm |
| July | 29°C | 18°C | 23.4°C | 134 mm | 0 cm |
| August | 29°C | 17°C | 23.1°C | 118 mm | 0 cm |
| September | 26°C | 13°C | 19.4°C | 102 mm | 0 cm |
| October | 20°C | 7°C | 13.4°C | 81 mm | 0 cm |
| November | 14°C | 1°C | 7.6°C | 104 mm | 1 cm |
| December | 9°C | −2°C | 3.4°C | 159 mm | 12 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00404590; 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.
When is the best weather to visit Jamestown?
Normal highs sit between 65°F and 85°F in April, May, June, July, August, September and October. Of those, October has the fewest days with rain (9).
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 USC00404590.
When is the last frost in Jamestown?
In Jamestown, the last spring frost (32°F) comes after April 20 in half of years and after May 8 in one year in ten; the first autumn frost comes before October 22 in half of years and before October 10 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 201 year in 10 after May 8; 9 in 10 after April 6
- First autumn frost, half of years before
- October 221 year in 10 before October 10; 9 in 10 before November 3
NOAA puts the median frost-free season at 183 days, and the season without a hard freeze (28°F) at 205 days.
A hard freeze (28°F) comes after April 6 in half of springs and before October 31 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Jamestown in zone 7a in ZIP code 38556, the nearest ZIP area.
Frost dates for every NOAA station in Tennessee · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00404590; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 in Jamestown?
In a normal year in Jamestown, 9 days a year reach 90°F, 103 nights fall to 32°F or colder and 140 days bring measurable precipitation.
- Days at 90°F or more
- 9a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 103a normal year
- Days that stay below freezing
- 13high of 32°F or less
- Days with 0.01 inch of precipitation
- 140a normal year
- Days with 1 inch of snow or more
- 6a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00404590.
How sunny is Jamestown?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Jamestown, 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 much heating and cooling does Jamestown need?
A normal year in Jamestown brings 4,486 heating degree days, 17% fewer than the median U.S. place (5,373), and 960 cooling degree days, 6% more than the median (908). Six months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,666 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 937 | 0 |
| February | 758 | 0 |
| March | 591 | 2 |
| April | 318 | 14 |
| May | 115 | 72 |
| June | 9 | 192 |
| July | 1 | 283 |
| August | 2 | 267 |
| September | 54 | 114 |
| October | 287 | 16 |
| November | 581 | 1 |
| December | 832 | 0 |
| Year (annual) | 4,486 | 960 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00404590. 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.
Has Jamestown been warmer than normal lately?
2021 averaged 55.6°F, 0.4°F above the 1991-2020 normal of 55.2°F.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 55.6°F | +0.4°F | 65.65 | – |
Source: observed years: ACIS, station USC00404590. A year counts only with all twelve months complete.
How does Jamestown's climate compare?
Jamestown is warmer than 6 of the other 115 places with their own NOAA record in Tennessee, and wetter than 88. Across the 7,247 U.S. stations with normals, its annual mean of 55.2°F is warmer than 61%.
In the Köppen classification computed from these normals, Jamestown 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.
Questions about Jamestown's climate
What is the coldest month in Jamestown?
January, with a normal high of 45°F and a normal low of 25°F. The warmest is July (84°F by day, 64°F at night).
Does it snow in Jamestown?
Yes: 19 inches in a normal year, falling on 12 days with 0.1 inch or more, the most in February (5.7 inches).
What is the rainiest month in Jamestown?
December, with 6.26 in of precipitation in a normal year; the driest is October with 3.18 in.
What plant hardiness zone is Jamestown in?
The USDA's 2023 map puts Jamestown in zone 7a in ZIP code 38556, the nearest ZIP area.
How late can frost come in Jamestown?
In half of years the last 32°F night comes after April 20; in one year in ten it comes after May 8. Waiting until May 8 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Tennessee climateThe statewide normals and every place in the state
- Allardt, TN5 miles from this station, 55.5°F a year
- Pickett State Park, TN12 miles from this station, 54.3°F a year
- Byrdstown, TN15 miles from this station, 56.8°F a year
- Livingston, TN22 miles from this station, 57.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made