Jamestown, Kentucky climate: Normal weather by month, frost dates and records
Jamestown's normal year runs from 25°F January nights to 86°F July afternoons, with 57.0 inches of precipitation and 5 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 13.0°C, January lows of −4°C, July highs of 30°C, 1,448 mm of precipitation a year.
- NOAA stationJamestown Wastewater Treatment Plant
- Station IDUSC00154208
- Location37.01°N 85.06°W
- Elevation890 ft (271 m)
- Population1,884
On October 14, the normal high in Jamestown is 70°F and the normal low 45°F, and the chance of measurable rain or snow is 27%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Jamestown.
- Jan 44° 25°
- Feb 48° 27°
- Mar 57° 34°
- Apr 68° 42°
- May 75° 53°
- Jun 83° 61°
- Jul 86° 65°
- Aug 85° 64°
- Sep 79° 56°
- Oct 69° 45°
- Nov 57° 34°
- Dec 47° 29°
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 86°F; January the coldest, with normal lows of 25°F. The most precipitation falls in January (5.48 in), the least in October (3.14 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 44°F | 25°F | 34.0°F | 5.48 | 1.1 | 11 | <1 | 24 | 9 h 50 min |
| February | 48°F | 27°F | 37.5°F | 4.57 | 2.8 | 10 | <1 | 21 | 10 h 50 min |
| March | 57°F | 34°F | 45.5°F | 5.36 | 1.0 | 12 | <1 | 16 | 11 h 50 min |
| April | 68°F | 42°F | 54.8°F | 5.12 | 0.0 | 12 | <1 | 7 | 13 h 10 min |
| May | 75°F | 53°F | 64.2°F | 5.41 | 0.0 | 12 | <1 | 1 | 14 h 10 min |
| June | 83°F | 61°F | 71.9°F | 4.97 | 0.0 | 10 | 5 | <1 | 14 h 40 min |
| July | 86°F | 65°F | 75.4°F | 5.09 | 0.0 | 12 | 9 | <1 | 14 h 30 min |
| August | 85°F | 64°F | 74.2°F | 4.19 | 0.0 | 8 | 8 | <1 | 13 h 40 min |
| September | 79°F | 56°F | 67.7°F | 4.64 | 0.0 | 8 | 3 | <1 | 12 h 30 min |
| October | 69°F | 45°F | 56.7°F | 3.14 | 0.0 | 8 | <1 | 4 | 11 h 20 min |
| November | 57°F | 34°F | 45.1°F | 4.01 | 0.0 | 9 | <1 | 16 | 10 h 10 min |
| December | 47°F | 29°F | 38.2°F | 5.04 | 0.0 | 13 | <1 | 22 | 9 h 40 min |
| Year (annual) | 66°F | 44°F | 55.4°F | 57.02 | 4.9 | 124 | 25 | 111 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 6°C | −4°C | 1.1°C | 139 mm | 3 cm |
| February | 9°C | −3°C | 3.1°C | 116 mm | 7 cm |
| March | 14°C | 1°C | 7.5°C | 136 mm | 3 cm |
| April | 20°C | 6°C | 12.7°C | 130 mm | 0 cm |
| May | 24°C | 12°C | 17.9°C | 137 mm | 0 cm |
| June | 28°C | 16°C | 22.2°C | 126 mm | 0 cm |
| July | 30°C | 18°C | 24.1°C | 129 mm | 0 cm |
| August | 29°C | 18°C | 23.4°C | 106 mm | 0 cm |
| September | 26°C | 13°C | 19.8°C | 118 mm | 0 cm |
| October | 21°C | 7°C | 13.7°C | 80 mm | 0 cm |
| November | 14°C | 1°C | 7.3°C | 102 mm | 0 cm |
| December | 9°C | −2°C | 3.4°C | 128 mm | 0 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00154208; 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, August, September and October. Of those, October 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 USC00154208.
When is the last frost in Jamestown?
In Jamestown, the last spring frost (32°F) comes after April 18 in half of years and after May 3 in one year in ten; the first autumn frost comes before October 24 in half of years and before October 11 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 181 year in 10 after May 3; 9 in 10 after April 2
- First autumn frost, half of years before
- October 241 year in 10 before October 11; 9 in 10 before November 5
NOAA puts the median frost-free season at 189 days, and the season without a hard freeze (28°F) at 210 days.
A hard freeze (28°F) comes after April 6 in half of springs and before November 2 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Jamestown in zone 7a in ZIP code 42642, the nearest ZIP area.
Frost dates for every NOAA station in Kentucky · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00154208; 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, 25 days a year reach 90°F, 111 nights fall to 32°F or colder and 124 days bring measurable precipitation.
- Days at 90°F or more
- 25a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 111a normal year
- Days that stay below freezing
- 12high of 32°F or less
- Days with 0.01 inch of precipitation
- 124a normal year
- Days with 1 inch of snow or more
- 2a normal year
The highest temperature in this station's record (since 1971) is 103°F, on June 30, 2012; the lowest is −19°F, on January 21, 1985.
The wettest calendar year on that record is 2018, with 77.54 in; the snowiest season is 2021–22, with 10.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00154208; records: ACIS (NOAA Regional Climate Centers), station USC00154208. Records use complete months only; a month missing more than three days is left out.
How sunny is Jamestown?
Over a year 74% 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 (81%) and December the cloudiest (62%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 63% | 2.0 |
| February | 62% | 2.7 |
| March | 66% | 3.8 |
| April | 73% | 5.1 |
| May | 74% | 5.7 |
| June | 80% | 6.3 |
| July | 79% | 6.0 |
| August | 81% | 5.6 |
| September | 79% | 4.7 |
| October | 75% | 3.5 |
| November | 72% | 2.5 |
| December | 62% | 1.8 |
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 4,541 heating degree days, 15% fewer than the median U.S. place (5,373), and 1,083 cooling degree days, 19% 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 3,803 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 961 | 0 |
| February | 770 | 0 |
| March | 607 | 3 |
| April | 320 | 15 |
| May | 110 | 85 |
| June | 11 | 216 |
| July | 1 | 324 |
| August | 3 | 286 |
| September | 50 | 131 |
| October | 279 | 22 |
| November | 598 | 1 |
| December | 831 | 0 |
| Year (annual) | 4,541 | 1,083 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00154208. 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?
2025 averaged 56.0°F, 0.6°F above the 1991-2020 normal of 55.4°F. 3 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 55.5°F | +0.1°F | 57.74 | 0.0 |
| 2022 | 54.5°F | −0.9°F | – | 11.5 |
| 2023 | 56.6°F | +1.2°F | 42.67 | 0.0 |
| 2025 | 56.0°F | +0.6°F | 63.23 | 0.0 |
Source: observed years: ACIS, station USC00154208. A year counts only with all twelve months complete.
How does Jamestown's climate compare?
Jamestown is warmer than 26 of the other 67 places with their own NOAA record in Kentucky, and wetter than 58. Across the 7,247 U.S. stations with normals, its annual mean of 55.4°F is warmer than 62%.
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.
Which places near Jamestown share this climate record?
Russell Springs has no NOAA station with 1991-2020 normals of its 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.
- Russell Springs, KY2,807 people · 3 mi N
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 Jamestown's climate
What is the coldest month in Jamestown?
January, with a normal high of 44°F and a normal low of 25°F. The warmest is July (86°F by day, 65°F at night).
Does it snow in Jamestown?
Yes: 5 inches in a normal year, falling on 3 days with 0.1 inch or more, the most in February (2.8 inches).
What is the rainiest month in Jamestown?
January, with 5.48 in of precipitation in a normal year; the driest is October with 3.14 in.
What plant hardiness zone is Jamestown in?
The USDA's 2023 map puts Jamestown in zone 7a in ZIP code 42642, the nearest ZIP area.
How late can frost come in Jamestown?
In half of years the last 32°F night comes after April 18; in one year in ten it comes after May 3. Waiting until May 3 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Kentucky climateThe statewide normals and every place in the state
- Monticello, KY16 miles from this station, 56.4°F a year
- Somerset, KY25 miles from this station, 58.3°F a year
- Byrdstown, TN30 miles from this station, 56.8°F a year
- Greensburg, KY30 miles from this station, 56.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made