Martinsville, Indiana climate: Normal weather by month, frost dates and records
Martinsville's normal year runs from 19°F January nights to 84°F July afternoons, with 45.5 inches of precipitation and 17 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.9°C, January lows of −7°C, July highs of 29°C, 1,155 mm of precipitation a year.
- NOAA stationMartinsville (2 mi SW)
- Station IDUSC00125407
- Location39.40°N 86.45°W
- Elevation592 ft (180 m)
- Population11,952
On October 23, the normal high in Martinsville is 63°F and the normal low 38°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 Martinsville.
- Jan 36° 19°
- Feb 41° 21°
- Mar 51° 29°
- Apr 63° 40°
- May 73° 50°
- Jun 81° 60°
- Jul 84° 63°
- Aug 83° 61°
- Sep 78° 53°
- Oct 66° 41°
- Nov 52° 32°
- Dec 41° 24°
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 Martinsville each month?
July is the warmest month, with normal highs of 84°F; January the coldest, with normal lows of 19°F. The most precipitation falls in June (5.31 in), the least in February (2.43 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 36°F | 19°F | 27.6°F | 3.16 | 6.3 | 11 | <1 | 27 | 9 h 40 min |
| February | 41°F | 21°F | 31.1°F | 2.43 | 3.8 | 10 | <1 | 24 | 10 h 40 min |
| March | 51°F | 29°F | 40.3°F | 3.55 | 2.1 | 11 | <1 | 20 | 11 h 50 min |
| April | 63°F | 40°F | 51.5°F | 4.83 | 0.1 | 12 | <1 | 7 | 13 h 10 min |
| May | 73°F | 50°F | 61.6°F | 4.97 | 0.0 | 13 | <1 | 1 | 14 h 20 min |
| June | 81°F | 60°F | 70.2°F | 5.31 | 0.0 | 11 | 2 | <1 | 15 h |
| July | 84°F | 63°F | 73.3°F | 4.08 | 0.0 | 10 | 5 | <1 | 14 h 40 min |
| August | 83°F | 61°F | 71.9°F | 3.44 | 0.0 | 8 | 4 | <1 | 13 h 50 min |
| September | 78°F | 53°F | 65.3°F | 3.52 | 0.0 | 7 | 2 | <1 | 12 h 30 min |
| October | 66°F | 41°F | 53.3°F | 3.47 | 0.1 | 9 | <1 | 6 | 11 h 10 min |
| November | 52°F | 32°F | 42.0°F | 3.61 | 0.4 | 10 | <1 | 17 | 10 h |
| December | 41°F | 24°F | 32.6°F | 3.12 | 3.9 | 11 | <1 | 24 | 9 h 20 min |
| Year (annual) | 63°F | 41°F | 51.7°F | 45.49 | 16.7 | 122 | 12 | 127 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 2°C | −7°C | −2.4°C | 80 mm | 16 cm |
| February | 5°C | −6°C | −0.5°C | 62 mm | 10 cm |
| March | 11°C | −2°C | 4.6°C | 90 mm | 5 cm |
| April | 17°C | 4°C | 10.8°C | 123 mm | 0 cm |
| May | 23°C | 10°C | 16.4°C | 126 mm | 0 cm |
| June | 27°C | 15°C | 21.2°C | 135 mm | 0 cm |
| July | 29°C | 17°C | 22.9°C | 104 mm | 0 cm |
| August | 29°C | 16°C | 22.2°C | 87 mm | 0 cm |
| September | 25°C | 12°C | 18.5°C | 89 mm | 0 cm |
| October | 19°C | 5°C | 11.8°C | 88 mm | 0 cm |
| November | 11°C | 0°C | 5.6°C | 92 mm | 1 cm |
| December | 5°C | −4°C | 0.3°C | 79 mm | 10 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00125407; 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 Martinsville?
Normal highs sit between 65°F and 85°F in May, June, July, August, September and October. Of those, September has the fewest days with rain (7).
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 USC00125407.
When is the last frost in Martinsville?
In Martinsville, the last spring frost (32°F) comes after April 24 in half of years and after May 11 in one year in ten; the first autumn frost comes before October 15 in half of years and before October 2 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 241 year in 10 after May 11; 9 in 10 after April 10
- First autumn frost, half of years before
- October 151 year in 10 before October 2; 9 in 10 before October 29
NOAA puts the median frost-free season at 173 days, and the season without a hard freeze (28°F) at 194 days.
A hard freeze (28°F) comes after April 12 in half of springs and before October 26 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Martinsville in zone 6a in ZIP code 46151, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Martinsville's NOAA station is in zone 6a: the coldest night of a typical year reaches −7°F (30 complete years).
Frost dates for every NOAA station in Indiana · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00125407; 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 in Martinsville?
In a normal year in Martinsville, 12 days a year reach 90°F, 127 nights fall to 32°F or colder and 122 days bring measurable precipitation.
- Days at 90°F or more
- 12a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 127a normal year
- Days that stay below freezing
- 29high of 32°F or less
- Days with 0.01 inch of precipitation
- 122a normal year
- Days with 1 inch of snow or more
- 5a normal year
The highest temperature in this station's record (since 1950) is 105°F, on July 19, 1954; the lowest is −35°F, on January 19, 1994.
The wettest calendar year on that record is 2008, with 64.61 in; the snowiest season is 1995–96, with 43.7 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00125407; records: ACIS (NOAA Regional Climate Centers), station USC00125407. Records use complete months only; a month missing more than three days is left out.
How sunny is Martinsville?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Martinsville, 4.0 kWh per square metre a day. August is the sunniest month (81%) and December the cloudiest (59%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 61% | 1.8 |
| February | 63% | 2.6 |
| March | 66% | 3.7 |
| April | 71% | 4.8 |
| May | 72% | 5.5 |
| June | 79% | 6.3 |
| July | 80% | 6.1 |
| August | 81% | 5.5 |
| September | 80% | 4.6 |
| October | 73% | 3.2 |
| November | 69% | 2.2 |
| December | 59% | 1.6 |
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 Martinsville need?
A normal year in Martinsville brings 5,647 heating degree days, 5% more than the median U.S. place (5,373), and 837 cooling degree days, 8% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,244 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,159 | 0 |
| February | 951 | 0 |
| March | 767 | 1 |
| April | 413 | 8 |
| May | 164 | 59 |
| June | 24 | 180 |
| July | 4 | 261 |
| August | 8 | 221 |
| September | 87 | 95 |
| October | 376 | 11 |
| November | 692 | 0 |
| December | 1,004 | 0 |
| Year (annual) | 5,647 | 837 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00125407. 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 Martinsville been warmer than normal lately?
Over 50 complete years from 1951 to 2020, the station's annual mean temperature rose at a fitted 0.2°F per century (+0.01°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Martinsville's climate compare?
Martinsville is warmer than 50 of the other 98 places with their own NOAA record in Indiana, and wetter than 60. Across the 7,247 U.S. stations with normals, its annual mean of 51.7°F is warmer than 48%.
In the Köppen classification computed from these normals, Martinsville is Dfa: continental, 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 Martinsville share this climate record?
11 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.
- Brooklyn, IN2,595 people · 11 mi NE
- Monrovia, IN2,322 people · 13 mi N
- Foxcliff Estates, IN1,693 people · 6 mi NE
- Morgantown, IN998 people · 11 mi E
- Painted Hills, IN983 people · 6 mi E
- Browns Crossing, IN731 people · 3 mi W
- Paragon, IN572 people · 6 mi W
- Helmsburg, IN322 people · 13 mi SE
- Centerton, IN235 people · 8 mi N
- Bethany, IN97 people · 10 mi NE
- Eminence, IN85 people · 13 mi NW
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 Martinsville's climate
What is the coldest month in Martinsville?
January, with a normal high of 36°F and a normal low of 19°F. The warmest is July (84°F by day, 63°F at night).
Does it snow in Martinsville?
Yes: 17 inches in a normal year, falling on 13 days with 0.1 inch or more, the most in January (6.3 inches).
What is the rainiest month in Martinsville?
June, with 5.31 in of precipitation in a normal year; the driest is February with 2.43 in.
What plant hardiness zone is Martinsville in?
The USDA's 2023 map puts Martinsville in zone 6a in ZIP code 46151, the nearest ZIP area. By the same method at Martinsville's NOAA station, the coldest night of a typical year reaches −7°F (30 years, 1991-2020): zone 6a.
How late can frost come in Martinsville?
In half of years the last 32°F night comes after April 24; in one year in ten it comes after May 11. Waiting until May 11 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Indiana climateThe statewide normals and every place in the state
- Spencer, IN19 miles from this station, 52.8°F a year
- Bloomington, IN21 miles from this station, 53.8°F a year
- Franklin, IN22 miles from this station, 51.6°F a year
- Indianapolis, IN23 miles from this station, 53.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made