Calhoun, Kentucky climate: Normal weather by month, frost dates and records
Calhoun's normal year runs from 26°F January nights to 87°F July afternoons, with 45.6 inches of precipitation and 4 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 14.0°C, January lows of −3°C, July highs of 31°C, 1,157 mm of precipitation a year.
- NOAA stationCalhoun Lock 2
- Station IDUSC00151227
- Location37.53°N 87.27°W
- Elevation402 ft (123 m)
- Population719
On October 14, the normal high in Calhoun is 71°F and the normal low 48°F, and the chance of measurable rain or snow is 23%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Calhoun.
- Jan 43° 26°
- Feb 47° 30°
- Mar 57° 37°
- Apr 68° 47°
- May 77° 57°
- Jun 84° 65°
- Jul 87° 68°
- Aug 87° 67°
- Sep 82° 59°
- Oct 70° 47°
- Nov 57° 36°
- Dec 46° 31°
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 Calhoun each month?
July is the warmest month, with normal highs of 87°F; January the coldest, with normal lows of 26°F. The most precipitation falls in May (4.59 in), the least in August (2.89 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 43°F | 26°F | 34.3°F | 3.26 | 0.9 | 9 | <1 | 22 | 9 h 50 min |
| February | 47°F | 30°F | 38.1°F | 3.63 | 1.3 | 8 | <1 | 20 | 10 h 50 min |
| March | 57°F | 37°F | 47.2°F | 4.38 | 0.6 | 10 | <1 | 10 | 11 h 50 min |
| April | 68°F | 47°F | 57.5°F | 4.48 | 0.0 | 10 | <1 | 1 | 13 h 10 min |
| May | 77°F | 57°F | 66.8°F | 4.59 | 0.0 | 10 | 1 | <1 | 14 h 10 min |
| June | 84°F | 65°F | 74.5°F | 4.14 | 0.0 | 9 | 6 | <1 | 14 h 40 min |
| July | 87°F | 68°F | 77.5°F | 4.16 | 0.0 | 8 | 11 | <1 | 14 h 30 min |
| August | 87°F | 67°F | 76.5°F | 2.89 | 0.0 | 6 | 11 | <1 | 13 h 40 min |
| September | 82°F | 59°F | 70.3°F | 3.13 | 0.0 | 6 | 5 | <1 | 12 h 30 min |
| October | 70°F | 47°F | 58.8°F | 3.27 | 0.0 | 7 | 1 | 1 | 11 h 20 min |
| November | 57°F | 36°F | 46.4°F | 3.37 | 0.0 | 8 | <1 | 11 | 10 h 10 min |
| December | 46°F | 31°F | 38.3°F | 4.26 | 1.5 | 9 | <1 | 19 | 9 h 40 min |
| Year (annual) | 67°F | 47°F | 57.2°F | 45.56 | 4.3 | 101 | 34 | 83 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 6°C | −3°C | 1.3°C | 83 mm | 2 cm |
| February | 8°C | −1°C | 3.4°C | 92 mm | 3 cm |
| March | 14°C | 3°C | 8.4°C | 111 mm | 2 cm |
| April | 20°C | 8°C | 14.2°C | 114 mm | 0 cm |
| May | 25°C | 14°C | 19.3°C | 117 mm | 0 cm |
| June | 29°C | 18°C | 23.6°C | 105 mm | 0 cm |
| July | 31°C | 20°C | 25.3°C | 106 mm | 0 cm |
| August | 30°C | 19°C | 24.7°C | 73 mm | 0 cm |
| September | 28°C | 15°C | 21.3°C | 80 mm | 0 cm |
| October | 21°C | 8°C | 14.9°C | 83 mm | 0 cm |
| November | 14°C | 2°C | 8.0°C | 86 mm | 0 cm |
| December | 8°C | −1°C | 3.5°C | 108 mm | 4 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00151227; 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 Calhoun?
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 (6).
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 USC00151227.
When is the last frost in Calhoun?
In Calhoun, the last spring frost (32°F) comes after April 2 in half of years and after April 20 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 21 year in 10 after April 20; 9 in 10 after March 17
- First autumn frost, half of years before
- November 11 year in 10 before October 19; 9 in 10 before November 15
NOAA puts the median frost-free season at 211 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 10 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Calhoun in zone 7a in ZIP code 42371, 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 USC00151227; 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 Calhoun?
In a normal year in Calhoun, 34 days a year reach 90°F (1 of them 100°F or more), 83 nights fall to 32°F or colder and 101 days bring measurable precipitation.
- Days at 90°F or more
- 34a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 83a normal year
- Days that stay below freezing
- 14high of 32°F or less
- Days with 0.01 inch of precipitation
- 101a normal year
- Days with 1 inch of snow or more
- 1a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00151227.
How sunny is Calhoun?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Calhoun, 4.2 kWh per square metre a day. July is the sunniest month (82%) and December the cloudiest (63%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 64% | 2.1 |
| February | 63% | 2.7 |
| March | 67% | 3.8 |
| April | 73% | 5.1 |
| May | 75% | 5.7 |
| June | 82% | 6.4 |
| July | 82% | 6.2 |
| August | 82% | 5.6 |
| September | 80% | 4.7 |
| October | 76% | 3.5 |
| November | 72% | 2.5 |
| December | 63% | 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 Calhoun need?
A normal year in Calhoun brings 4,231 heating degree days, 21% fewer than the median U.S. place (5,373), and 1,416 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 4,293 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 951 | 0 |
| February | 754 | 1 |
| March | 557 | 4 |
| April | 250 | 27 |
| May | 68 | 124 |
| June | 3 | 287 |
| July | 0 | 388 |
| August | 1 | 357 |
| September | 28 | 188 |
| October | 232 | 40 |
| November | 560 | 2 |
| December | 828 | 0 |
| Year (annual) | 4,231 | 1,416 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00151227. 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.
How does Calhoun's climate compare?
Calhoun is warmer than 52 of the other 67 places with their own NOAA record in Kentucky, and wetter than 0. Across the 7,247 U.S. stations with normals, its annual mean of 57.2°F is warmer than 67%.
In the Köppen classification computed from these normals, Calhoun 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 Calhoun share this climate record?
9 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.
- Masonville, KY2,634 people · 15 mi NE
- Livermore, KY1,204 people · 8 mi E
- Island, KY446 people · 9 mi SE
- Sacramento, KY424 people · 8 mi S
- Beech Grove, KY180 people · 9 mi NW
- Bremen, KY171 people · 12 mi S
- Onton, KY113 people · 10 mi W
- Utica, KY55 people · 10 mi NE
- Panther, KY0 people · 8 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 Calhoun's climate
What is the coldest month in Calhoun?
January, with a normal high of 43°F and a normal low of 26°F. The warmest is July (87°F by day, 68°F at night).
Does it snow in Calhoun?
Yes: 4 inches in a normal year, falling on 2 days with 0.1 inch or more, the most in December (1.5 inches).
What is the rainiest month in Calhoun?
May, with 4.59 in of precipitation in a normal year; the driest is August with 2.89 in.
What plant hardiness zone is Calhoun in?
The USDA's 2023 map puts Calhoun in zone 7a in ZIP code 42371, the nearest ZIP area.
How late can frost come in Calhoun?
In half of years the last 32°F night comes after April 2; in one year in ten it comes after April 20. Waiting until April 20 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Kentucky climateThe statewide normals and every place in the state
- Madisonville, KY19 miles from this station, 59.5°F a year
- Beaver Dam, KY21 miles from this station, 56.9°F a year
- Henderson, KY24 miles from this station, 56.6°F a year
- Newburgh, IN29 miles from this station, 57.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made