Attica, Indiana climate: Normal weather by month, frost dates and records
Attica's normal year runs from 16°F January nights to 84°F July afternoons, with 40.1 inches of precipitation and 23 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.4°C, January lows of −9°C, July highs of 29°C, 1,018 mm of precipitation a year.
- NOAA stationAttica (2 mi E)
- Station IDUSC00120331
- Location40.28°N 87.20°W
- Elevation727 ft (222 m)
- Population3,247
On October 23, the normal high in Attica is 62°F and the normal low 39°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 Attica.
- Jan 33° 16°
- Feb 38° 19°
- Mar 49° 28°
- Apr 62° 39°
- May 73° 51°
- Jun 82° 60°
- Jul 84° 62°
- Aug 83° 60°
- Sep 78° 53°
- Oct 66° 42°
- Nov 50° 31°
- Dec 38° 22°
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 Attica each month?
July is the warmest month, with normal highs of 84°F; January the coldest, with normal lows of 16°F. The most precipitation falls in June (4.86 in), the least in February (1.92 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 33°F | 16°F | 24.4°F | 2.33 | 8.1 | 9 | <1 | 28 | 9 h 40 min |
| February | 38°F | 19°F | 28.3°F | 1.92 | 5.7 | 8 | <1 | 25 | 10 h 40 min |
| March | 49°F | 28°F | 38.7°F | 2.87 | 3.1 | 9 | <1 | 21 | 11 h 50 min |
| April | 62°F | 39°F | 50.6°F | 4.14 | 0.2 | 11 | <1 | 7 | 13 h 10 min |
| May | 73°F | 51°F | 61.9°F | 4.23 | 0.0 | 12 | 1 | <1 | 14 h 20 min |
| June | 82°F | 60°F | 71.0°F | 4.86 | 0.0 | 11 | 4 | <1 | 15 h |
| July | 84°F | 62°F | 73.1°F | 4.77 | 0.0 | 9 | 5 | <1 | 14 h 50 min |
| August | 83°F | 60°F | 71.4°F | 3.51 | 0.0 | 8 | 4 | <1 | 13 h 50 min |
| September | 78°F | 53°F | 65.6°F | 2.71 | 0.0 | 7 | 2 | <1 | 12 h 30 min |
| October | 66°F | 42°F | 53.5°F | 3.19 | 0.0 | 8 | <1 | 5 | 11 h 10 min |
| November | 50°F | 31°F | 40.6°F | 3.12 | 0.7 | 9 | <1 | 17 | 10 h |
| December | 38°F | 22°F | 30.1°F | 2.43 | 5.5 | 9 | <1 | 26 | 9 h 20 min |
| Year (annual) | 61°F | 40°F | 50.8°F | 40.08 | 23.3 | 110 | 16 | 129 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 1°C | −9°C | −4.2°C | 59 mm | 21 cm |
| February | 3°C | −7°C | −2.1°C | 49 mm | 14 cm |
| March | 10°C | −2°C | 3.7°C | 73 mm | 8 cm |
| April | 17°C | 4°C | 10.3°C | 105 mm | 1 cm |
| May | 23°C | 10°C | 16.6°C | 107 mm | 0 cm |
| June | 28°C | 16°C | 21.7°C | 123 mm | 0 cm |
| July | 29°C | 17°C | 22.8°C | 121 mm | 0 cm |
| August | 28°C | 16°C | 21.9°C | 89 mm | 0 cm |
| September | 26°C | 12°C | 18.7°C | 69 mm | 0 cm |
| October | 19°C | 5°C | 11.9°C | 81 mm | 0 cm |
| November | 10°C | −1°C | 4.8°C | 79 mm | 2 cm |
| December | 3°C | −6°C | −1.1°C | 62 mm | 14 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00120331; 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 Attica?
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 USC00120331.
When is the last frost in Attica?
In Attica, the last spring frost (32°F) comes after April 22 in half of years and after May 8 in one year in ten; the first autumn frost comes before October 17 in half of years and before October 1 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 221 year in 10 after May 8; 9 in 10 after April 8
- First autumn frost, half of years before
- October 171 year in 10 before October 1; 9 in 10 before October 30
NOAA puts the median frost-free season at 176 days, and the season without a hard freeze (28°F) at 198 days.
A hard freeze (28°F) comes after April 11 in half of springs and before October 28 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Attica in zone 6a in ZIP code 47918, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Attica's NOAA station is in zone 5b: the coldest night of a typical year reaches −10°F (19 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Indiana · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00120331; 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 Attica?
In a normal year in Attica, 16 days a year reach 90°F, 129 nights fall to 32°F or colder and 110 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
- 129a normal year
- Days that stay below freezing
- 40high of 32°F or less
- Days with 0.01 inch of precipitation
- 110a normal year
- Days with 1 inch of snow or more
- 8a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00120331.
How sunny is Attica?
Over a year 74% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Attica, 4.0 kWh per square metre a day. July is the sunniest month (81%) and December the cloudiest (60%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 62% | 1.8 |
| February | 66% | 2.7 |
| March | 67% | 3.6 |
| April | 70% | 4.8 |
| May | 72% | 5.5 |
| June | 79% | 6.3 |
| July | 81% | 6.3 |
| August | 81% | 5.6 |
| September | 80% | 4.6 |
| October | 72% | 3.1 |
| November | 69% | 2.1 |
| December | 60% | 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 Attica need?
A normal year in Attica brings 6,020 heating degree days, 12% more than the median U.S. place (5,373), and 864 cooling degree days, 5% 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 3,249 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,260 | 0 |
| February | 1,029 | 0 |
| March | 818 | 1 |
| April | 439 | 9 |
| May | 161 | 67 |
| June | 26 | 207 |
| July | 4 | 253 |
| August | 9 | 209 |
| September | 85 | 102 |
| October | 373 | 16 |
| November | 734 | 0 |
| December | 1,083 | 0 |
| Year (annual) | 6,020 | 864 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00120331. 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 Attica's climate compare?
Attica is warmer than 34 of the other 98 places with their own NOAA record in Indiana, and wetter than 20. Across the 7,247 U.S. stations with normals, its annual mean of 50.8°F is warmer than 44%.
In the Köppen classification computed from these normals, Attica 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 Attica 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.
- Williamsport, IN1,953 people · 5 mi W
- Hillsboro, IN509 people · 12 mi S
- New Richmond, IN315 people · 13 mi SE
- Wingate, IN249 people · 10 mi SE
- Newtown, IN219 people · 6 mi SE
- Pine Village, IN211 people · 12 mi N
- Mellott, IN175 people · 9 mi S
- Stone Bluff, IN157 people · 9 mi S
- Rob Roy, IN77 people · 4 mi SW
- Kramer, IN51 people · 6 mi NW
- Independence, IN37 people · 4 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 Attica's climate
What is the coldest month in Attica?
January, with a normal high of 33°F and a normal low of 16°F. The warmest is July (84°F by day, 62°F at night).
Does it snow in Attica?
Yes: 23 inches in a normal year, falling on 19 days with 0.1 inch or more, the most in January (8.1 inches).
What is the rainiest month in Attica?
June, with 4.86 in of precipitation in a normal year; the driest is February with 1.92 in.
What plant hardiness zone is Attica in?
The USDA's 2023 map puts Attica in zone 6a in ZIP code 47918, the nearest ZIP area. By the same method at Attica's NOAA station, the coldest night of a typical year reaches −10°F (19 years, 1991-2020): zone 5b.
How late can frost come in Attica?
In half of years the last 32°F night comes after April 22; in one year in ten it comes after May 8. Waiting until May 8 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Indiana climateThe statewide normals and every place in the state
- Lafayette, IN16 miles from this station, 51.3°F a year
- West Lafayette, IN17 miles from this station, 50.4°F a year
- Perrysville, IN22 miles from this station, 52.2°F a year
- Boswell, IN22 miles from this station, 49.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made