J.T. Myers Locks & Dam, Indiana climate: Climate normals at a NOAA weather station
J.T. Myers Locks & Dam's normal year runs from 26°F January nights to 88°F July afternoons, with 48.2 inches of precipitation and 8 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 13.8°C, January lows of −4°C, July highs of 31°C, 1,225 mm of precipitation a year.
- NOAA stationJ.T. Myers Locks & Dam
- Station IDUSC00128967
- Location37.80°N 87.99°W
- Elevation340 ft (104 m)
On October 23, the normal high in J.T. Myers Locks & Dam is 66°F and the normal low 45°F, and the chance of measurable rain or snow is 26%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for J.T. Myers Locks & Dam.
- Jan 42° 26°
- Feb 47° 28°
- Mar 56° 37°
- Apr 68° 46°
- May 77° 56°
- Jun 85° 64°
- Jul 88° 68°
- Aug 88° 66°
- Sep 81° 59°
- Oct 70° 47°
- Nov 56° 36°
- Dec 45° 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 at J.T. Myers Locks & Dam each month?
July is the warmest month, with normal highs of 88°F; January the coldest, with normal lows of 26°F. The most precipitation falls in April (5.38 in), the least in August (3.12 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 42°F | 26°F | 33.8°F | 3.57 | 2.1 | 9 | <1 | 22 | 9 h 50 min |
| February | 47°F | 28°F | 37.4°F | 3.50 | 1.7 | 9 | <1 | 20 | 10 h 50 min |
| March | 56°F | 37°F | 46.4°F | 4.48 | 0.7 | 11 | <1 | 9 | 11 h 50 min |
| April | 68°F | 46°F | 57.0°F | 5.38 | 0.0 | 10 | <1 | 1 | 13 h 10 min |
| May | 77°F | 56°F | 66.4°F | 5.02 | 0.0 | 11 | 2 | <1 | 14 h 10 min |
| June | 85°F | 64°F | 74.8°F | 4.75 | 0.0 | 9 | 9 | <1 | 14 h 50 min |
| July | 88°F | 68°F | 78.0°F | 3.65 | 0.0 | 8 | 15 | <1 | 14 h 30 min |
| August | 88°F | 66°F | 76.8°F | 3.12 | 0.0 | 6 | 11 | <1 | 13 h 40 min |
| September | 81°F | 59°F | 70.1°F | 3.35 | 0.0 | 6 | 6 | <1 | 12 h 30 min |
| October | 70°F | 47°F | 58.5°F | 3.28 | 0.0 | 7 | 1 | 1 | 11 h 20 min |
| November | 56°F | 36°F | 45.8°F | 4.09 | 0.0 | 9 | <1 | 10 | 10 h 10 min |
| December | 45°F | 29°F | 37.1°F | 4.02 | 3.0 | 10 | <1 | 18 | 9 h 30 min |
| Year (annual) | 67°F | 47°F | 56.8°F | 48.21 | 7.5 | 107 | 44 | 80 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 6°C | −4°C | 1.0°C | 91 mm | 5 cm |
| February | 8°C | −2°C | 3.0°C | 89 mm | 4 cm |
| March | 14°C | 3°C | 8.0°C | 114 mm | 2 cm |
| April | 20°C | 8°C | 13.9°C | 137 mm | 0 cm |
| May | 25°C | 13°C | 19.1°C | 128 mm | 0 cm |
| June | 30°C | 18°C | 23.8°C | 121 mm | 0 cm |
| July | 31°C | 20°C | 25.6°C | 93 mm | 0 cm |
| August | 31°C | 19°C | 24.9°C | 79 mm | 0 cm |
| September | 27°C | 15°C | 21.2°C | 85 mm | 0 cm |
| October | 21°C | 9°C | 14.7°C | 83 mm | 0 cm |
| November | 13°C | 2°C | 7.7°C | 104 mm | 0 cm |
| December | 7°C | −2°C | 2.8°C | 102 mm | 8 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00128967; 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 J.T. Myers Locks & Dam?
Normal highs sit between 65°F and 85°F in April, May, 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 USC00128967.
When is the last frost at J.T. Myers Locks & Dam?
In J.T. Myers Locks & Dam, the last spring frost (32°F) comes after April 5 in half of years and after April 21 in one year in ten; the first autumn frost comes before October 31 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 21; 9 in 10 after March 21
- First autumn frost, half of years before
- October 311 year in 10 before October 19; 9 in 10 before November 11
NOAA puts the median frost-free season at 209 days, and the season without a hard freeze (28°F) at 230 days.
A hard freeze (28°F) comes after March 24 in half of springs and before November 8 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts J.T. Myers Locks & Dam in zone 7a in ZIP code 42461, the nearest ZIP area.
Frost dates for every NOAA station in Indiana · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00128967; 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 at J.T. Myers Locks & Dam?
In a normal year in J.T. Myers Locks & Dam, 44 days a year reach 90°F (1 of them 100°F or more), 80 nights fall to 32°F or colder and 107 days bring measurable precipitation.
- Days at 90°F or more
- 44a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 80a normal year
- Days that stay below freezing
- 13high of 32°F or less
- Days with 0.01 inch of precipitation
- 107a normal year
- Days with 1 inch of snow or more
- 2a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00128967.
How sunny is it at J.T. Myers Locks & Dam?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds at J.T. Myers Locks & Dam, 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 many heating and cooling degree days does J.T. Myers Locks & Dam record?
A normal year at J.T. Myers Locks & Dam brings 4,374 heating degree days, 19% fewer than the median U.S. place (5,373), and 1,437 cooling degree days, 58% 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 4,262 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 965 | 0 |
| February | 774 | 0 |
| March | 579 | 4 |
| April | 261 | 21 |
| May | 79 | 123 |
| June | 3 | 296 |
| July | 1 | 404 |
| August | 1 | 368 |
| September | 31 | 184 |
| October | 239 | 37 |
| November | 576 | 2 |
| December | 865 | 0 |
| Year (annual) | 4,374 | 1,437 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00128967. 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 J.T. Myers Locks & Dam's climate compare?
J.T. Myers Locks & Dam is warmer than 94 of the 99 places with their own NOAA record in Indiana, and wetter than 76. Across the 7,247 U.S. stations with normals, its annual mean of 56.8°F is warmer than 66%.
In the Köppen classification computed from these normals, J.T. Myers Locks & Dam 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 J.T. Myers Locks & Dam share this climate record?
12 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.
- Morganfield, KY3,131 people · 10 mi SE
- Sturgis, KY1,655 people · 17 mi S
- Breckinridge Center, KY1,592 people · 10 mi SE
- Shawneetown, IL998 people · 12 mi SW
- Uniontown, KY893 people · 4 mi SE
- Ridgway, IL805 people · 15 mi W
- Corydon, KY722 people · 16 mi E
- New Haven, IL379 people · 10 mi NW
- Waverly, KY302 people · 11 mi SE
- Omaha, IL206 people · 18 mi W
- Old Shawneetown, IL104 people · 10 mi SW
- Junction, IL54 people · 14 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 J.T. Myers Locks & Dam's climate
What is the coldest month at J.T. Myers Locks & Dam?
January, with a normal high of 42°F and a normal low of 26°F. The warmest is July (88°F by day, 68°F at night).
Does it snow at J.T. Myers Locks & Dam?
Yes: 8 inches in a normal year, falling on 3 days with 0.1 inch or more, the most in December (3.0 inches).
What is the rainiest month at J.T. Myers Locks & Dam?
April, with 5.38 in of precipitation in a normal year; the driest is August with 3.12 in.
What plant hardiness zone is J.T. Myers Locks & Dam in?
The USDA's 2023 map puts J.T. Myers Locks & Dam in zone 7a in ZIP code 42461, the nearest ZIP area.
How late can frost come at J.T. Myers Locks & Dam?
In half of years the last 32°F night comes after April 5; in one year in ten it comes after April 21. Waiting until April 21 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Indiana climateThe statewide normals and every place in the state
- Mount Vernon, IN11 miles from this station, 55.9°F a year
- Carmi, IL22 miles from this station, 55.0°F a year
- Henderson, KY23 miles from this station, 56.6°F a year
- Harrisburg, IL29 miles from this station, 57.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made