Greenfield, Indiana climate: Normal weather by month, frost dates and records
Greenfield's normal year runs from 19°F January nights to 84°F July afternoons, with 47.8 inches of precipitation and 20 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.1°C, January lows of −7°C, July highs of 29°C, 1,213 mm of precipitation a year.
- NOAA stationGreenfield
- Station IDUSC00123527
- Location39.79°N 85.76°W
- Elevation869 ft (265 m)
- From the centerunder 1 mile
- Population26,268
On October 23, the normal high in Greenfield is 62°F and the normal low 40°F, and the chance of measurable rain or snow is 35%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Greenfield.
- Jan 35° 19°
- Feb 39° 22°
- Mar 50° 30°
- Apr 62° 41°
- May 73° 52°
- Jun 81° 61°
- Jul 84° 64°
- Aug 83° 62°
- Sep 78° 55°
- Oct 65° 43°
- Nov 51° 33°
- Dec 39° 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 Greenfield 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 (5.69 in), the least in February (2.58 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 35°F | 19°F | 26.7°F | 3.29 | 7.4 | 12 | <1 | 27 | 9 h 40 min |
| February | 39°F | 22°F | 30.2°F | 2.58 | 5.4 | 10 | <1 | 24 | 10 h 40 min |
| March | 50°F | 30°F | 39.8°F | 3.65 | 1.8 | 12 | <1 | 20 | 11 h 50 min |
| April | 62°F | 41°F | 51.6°F | 4.72 | 0.1 | 14 | <1 | 5 | 13 h 10 min |
| May | 73°F | 52°F | 62.3°F | 5.29 | 0.0 | 14 | <1 | <1 | 14 h 20 min |
| June | 81°F | 61°F | 71.2°F | 5.69 | 0.0 | 13 | 3 | <1 | 15 h |
| July | 84°F | 64°F | 74.2°F | 4.75 | 0.0 | 11 | 6 | <1 | 14 h 40 min |
| August | 83°F | 62°F | 72.7°F | 3.73 | 0.0 | 10 | 4 | <1 | 13 h 50 min |
| September | 78°F | 55°F | 66.2°F | 3.71 | 0.0 | 9 | 2 | <1 | 12 h 30 min |
| October | 65°F | 43°F | 54.0°F | 3.47 | 0.0 | 10 | <1 | 4 | 11 h 10 min |
| November | 51°F | 33°F | 41.9°F | 3.67 | 0.7 | 11 | <1 | 15 | 10 h |
| December | 39°F | 24°F | 31.7°F | 3.22 | 4.8 | 12 | <1 | 24 | 9 h 20 min |
| Year (annual) | 62°F | 42°F | 51.9°F | 47.77 | 20.2 | 138 | 16 | 119 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 2°C | −7°C | −2.9°C | 84 mm | 19 cm |
| February | 4°C | −6°C | −1.0°C | 66 mm | 14 cm |
| March | 10°C | −1°C | 4.3°C | 93 mm | 5 cm |
| April | 17°C | 5°C | 10.9°C | 120 mm | 0 cm |
| May | 23°C | 11°C | 16.8°C | 134 mm | 0 cm |
| June | 27°C | 16°C | 21.8°C | 145 mm | 0 cm |
| July | 29°C | 18°C | 23.4°C | 121 mm | 0 cm |
| August | 28°C | 17°C | 22.6°C | 95 mm | 0 cm |
| September | 25°C | 13°C | 19.0°C | 94 mm | 0 cm |
| October | 18°C | 6°C | 12.2°C | 88 mm | 0 cm |
| November | 11°C | 0°C | 5.5°C | 93 mm | 2 cm |
| December | 4°C | −4°C | −0.2°C | 82 mm | 12 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00123527; 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 Greenfield?
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 (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 USC00123527.
When is the last frost in Greenfield?
In Greenfield, the last spring frost (32°F) comes after April 19 in half of years and after May 7 in one year in ten; the first autumn frost comes before October 22 in half of years and before October 9 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 191 year in 10 after May 7; 9 in 10 after April 6
- First autumn frost, half of years before
- October 221 year in 10 before October 9; 9 in 10 before November 1
NOAA puts the median frost-free season at 185 days, and the season without a hard freeze (28°F) at 206 days.
A hard freeze (28°F) comes after April 7 in half of springs and before November 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Greenfield in zone 6a in ZIP code 46140, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Greenfield's NOAA station is in zone 6a: the coldest night of a typical year reaches −6°F (26 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 USC00123527; 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 Greenfield?
In a normal year in Greenfield, 16 days a year reach 90°F, 119 nights fall to 32°F or colder and 138 days bring measurable precipitation.
- Days at 90°F or more
- 16a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 119a normal year
- Days that stay below freezing
- 34high of 32°F or less
- Days with 0.01 inch of precipitation
- 138a normal year
- Days with 1 inch of snow or more
- 7a normal year
The highest temperature in this station's record (since 1903) is 109°F, on July 14, 1936; the lowest is −29°F, on January 20, 1985.
The wettest calendar year on that record is 2018, with 60.97 in; the snowiest season is 1950–51, with 46.6 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00123527; records: ACIS (NOAA Regional Climate Centers), station USC00123527. Records use complete months only; a month missing more than three days is left out.
How sunny is Greenfield?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Greenfield, 4.0 kWh per square metre a day. August is the sunniest month (81%) and December the cloudiest (58%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 60% | 1.8 |
| February | 62% | 2.6 |
| March | 66% | 3.6 |
| April | 71% | 4.9 |
| May | 72% | 5.5 |
| June | 79% | 6.2 |
| July | 80% | 6.1 |
| August | 81% | 5.6 |
| September | 79% | 4.5 |
| October | 73% | 3.2 |
| November | 69% | 2.2 |
| December | 58% | 1.5 |
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 Greenfield need?
A normal year in Greenfield brings 5,706 heating degree days, 6% more than the median U.S. place (5,373), and 953 cooling degree days, 5% more 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 3,388 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,189 | 0 |
| February | 973 | 0 |
| March | 784 | 1 |
| April | 413 | 9 |
| May | 158 | 75 |
| June | 21 | 207 |
| July | 3 | 288 |
| August | 5 | 244 |
| September | 77 | 113 |
| October | 356 | 15 |
| November | 695 | 0 |
| December | 1,032 | 0 |
| Year (annual) | 5,706 | 953 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00123527. 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 Greenfield been warmer than normal lately?
2025 averaged 52.6°F, 0.7°F above the 1991-2020 normal of 51.9°F. 4 of the 4 complete years since 2022 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2022 | 52.0°F | +0.1°F | 40.29 | 9.5 |
| 2023 | 54.0°F | +2.1°F | 38.40 | 3.7 |
| 2024 | 54.9°F | +3.0°F | 45.49 | 11.9 |
| 2025 | 52.6°F | +0.7°F | 40.61 | 31.5 |
Over 87 complete years from 1905 to 2025, the station's annual mean temperature rose at a fitted 1.7°F per century (+0.10°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00123527; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Greenfield's climate compare?
Greenfield is warmer than 55 of the other 98 places with their own NOAA record in Indiana, and wetter than 71. Across the 7,247 U.S. stations with normals, its annual mean of 51.9°F is warmer than 49%.
In the Köppen classification computed from these normals, Greenfield 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 Greenfield share this climate record?
14 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.
- Fortville, IN4,927 people · 11 mi NW
- New Palestine, IN3,621 people · 8 mi SW
- Morristown, IN1,197 people · 7 mi S
- Carthage, IN916 people · 11 mi E
- Wilkinson, IN418 people · 11 mi NE
- Carrollton, IN411 people · 6 mi SW
- Charlottesville, IN403 people · 8 mi E
- Philadelphia, IN381 people · 4 mi W
- Maxwell, IN339 people · 5 mi N
- Spring Lake, IN215 people · 5 mi W
- Fountaintown, IN137 people · 6 mi S
- Willow Branch, IN129 people · 7 mi NE
- Warrington, IN51 people · 11 mi NE
- Eden, IN45 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 Greenfield's climate
What is the coldest month in Greenfield?
January, with a normal high of 35°F and a normal low of 19°F. The warmest is July (84°F by day, 64°F at night).
Does it snow in Greenfield?
Yes: 20 inches in a normal year, falling on 17 days with 0.1 inch or more, the most in January (7.4 inches).
What is the rainiest month in Greenfield?
June, with 5.69 in of precipitation in a normal year; the driest is February with 2.58 in.
What plant hardiness zone is Greenfield in?
The USDA's 2023 map puts Greenfield in zone 6a in ZIP code 46140, the nearest ZIP area. By the same method at Greenfield's NOAA station, the coldest night of a typical year reaches −6°F (26 years, 1991-2020): zone 6a.
How late can frost come in Greenfield?
In half of years the last 32°F night comes after April 19; in one year in ten it comes after May 7. Waiting until May 7 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Indiana climateThe statewide normals and every place in the state
- Shelbyville, IN14 miles from this station, 54.2°F a year
- Castleton (2 mi S), IN17 miles from this station, 52.7°F a year
- Beech Grove, IN17 miles from this station, 51.8°F a year
- Carmel, IN20 miles from this station, 51.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made