Iuka (12 mi SW), Illinois climate: Climate normals at a NOAA weather station
Iuka (12 mi SW)'s normal year runs from 21°F January nights to 88°F July afternoons, with 44.7 inches of precipitation and 12 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.6°C, January lows of −6°C, July highs of 31°C, 1,135 mm of precipitation a year.
- NOAA stationIuka (12 mi SW)
- Station IDUSC00114400
- Location38.49°N 88.97°W
- Elevation590 ft (180 m)
On October 23, the normal high in Iuka (12 mi SW) is 66°F and the normal low 42°F, and the chance of measurable rain or snow is 29%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Iuka (12 mi SW).
- Jan 39° 21°
- Feb 44° 24°
- Mar 54° 33°
- Apr 66° 44°
- May 75° 54°
- Jun 84° 62°
- Jul 88° 66°
- Aug 87° 64°
- Sep 81° 56°
- Oct 69° 45°
- Nov 55° 34°
- Dec 43° 26°
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 Iuka (12 mi SW) each month?
July is the warmest month, with normal highs of 88°F; January the coldest, with normal lows of 21°F. The most precipitation falls in May (5.20 in), the least in February (2.58 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 39°F | 21°F | 29.8°F | 2.87 | 3.4 | 8 | <1 | 26 | 9 h 50 min |
| February | 44°F | 24°F | 34.2°F | 2.58 | 4.5 | 8 | <1 | 22 | 10 h 40 min |
| March | 54°F | 33°F | 43.6°F | 3.90 | 0.5 | 11 | <1 | 16 | 11 h 50 min |
| April | 66°F | 44°F | 54.9°F | 4.81 | 0.0 | 11 | <1 | 4 | 13 h 10 min |
| May | 75°F | 54°F | 64.4°F | 5.20 | 0.0 | 12 | <1 | <1 | 14 h 10 min |
| June | 84°F | 62°F | 73.2°F | 4.08 | 0.0 | 10 | 6 | <1 | 14 h 50 min |
| July | 88°F | 66°F | 76.7°F | 3.85 | 0.0 | 9 | 12 | <1 | 14 h 40 min |
| August | 87°F | 64°F | 75.3°F | 3.54 | 0.0 | 8 | 10 | <1 | 13 h 40 min |
| September | 81°F | 56°F | 68.4°F | 3.29 | 0.0 | 7 | 5 | <1 | 12 h 30 min |
| October | 69°F | 45°F | 57.0°F | 3.45 | 0.0 | 9 | <1 | 3 | 11 h 20 min |
| November | 55°F | 34°F | 44.5°F | 4.09 | 0.4 | 9 | <1 | 14 | 10 h 10 min |
| December | 43°F | 26°F | 34.4°F | 3.02 | 3.2 | 9 | <1 | 24 | 9 h 30 min |
| Year (annual) | 65°F | 44°F | 54.7°F | 44.68 | 12.0 | 110 | 33 | 109 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 4°C | −6°C | −1.2°C | 73 mm | 9 cm |
| February | 7°C | −4°C | 1.2°C | 66 mm | 11 cm |
| March | 12°C | 1°C | 6.4°C | 99 mm | 1 cm |
| April | 19°C | 6°C | 12.7°C | 122 mm | 0 cm |
| May | 24°C | 12°C | 18.0°C | 132 mm | 0 cm |
| June | 29°C | 17°C | 22.9°C | 104 mm | 0 cm |
| July | 31°C | 19°C | 24.8°C | 98 mm | 0 cm |
| August | 31°C | 18°C | 24.1°C | 90 mm | 0 cm |
| September | 27°C | 13°C | 20.2°C | 84 mm | 0 cm |
| October | 21°C | 7°C | 13.9°C | 88 mm | 0 cm |
| November | 13°C | 1°C | 6.9°C | 104 mm | 1 cm |
| December | 6°C | −4°C | 1.3°C | 77 mm | 8 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00114400; 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 Iuka (12 mi SW)?
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 (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 USC00114400.
When is the last frost at Iuka (12 mi SW)?
In Iuka (12 mi SW), the last spring frost (32°F) comes after April 9 in half of years and after April 25 in one year in ten; the first autumn frost comes before October 24 in half of years and before October 10 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 91 year in 10 after April 25; 9 in 10 after March 27
- First autumn frost, half of years before
- October 241 year in 10 before October 10; 9 in 10 before November 5
NOAA puts the median frost-free season at 196 days, and the season without a hard freeze (28°F) at 217 days.
A hard freeze (28°F) comes after March 30 in half of springs and before November 2 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Iuka (12 mi SW) in zone 6b in ZIP code 62830, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 6b: the coldest night of a typical year reaches −1°F (21 complete years).
Frost dates for every NOAA station in Illinois · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00114400; 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 at Iuka (12 mi SW)?
In a normal year in Iuka (12 mi SW), 33 days a year reach 90°F (1 of them 100°F or more), 109 nights fall to 32°F or colder and 110 days bring measurable precipitation.
- Days at 90°F or more
- 33a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 109a normal year
- Days that stay below freezing
- 23high of 32°F or less
- Days with 0.01 inch of precipitation
- 110a normal year
- Days with 1 inch of snow or more
- 5a normal year
The highest temperature in this station's record (since 1997) is 107°F, on June 29, 2012; the lowest is −14°F, on January 7, 2014.
The wettest calendar year on that record is 2011, with 59.99 in; the snowiest season is 2002–03, with 34.9 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00114400; records: ACIS (NOAA Regional Climate Centers), station USC00114400. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Iuka (12 mi SW)?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds at Iuka (12 mi SW), 4.2 kWh per square metre a day. August is the sunniest month (83%) and December the cloudiest (63%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 65% | 2.0 |
| February | 66% | 2.8 |
| March | 67% | 3.7 |
| April | 73% | 5.0 |
| May | 73% | 5.6 |
| June | 82% | 6.5 |
| July | 83% | 6.3 |
| August | 83% | 5.7 |
| September | 81% | 4.7 |
| October | 76% | 3.4 |
| November | 71% | 2.4 |
| December | 63% | 1.7 |
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 Iuka (12 mi SW) record?
A normal year at Iuka (12 mi SW) brings 4,974 heating degree days, 7% fewer than the median U.S. place (5,373), and 1,251 cooling degree days, 38% more than the median (908). Six months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,921 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,089 | 0 |
| February | 864 | 0 |
| March | 667 | 4 |
| April | 322 | 19 |
| May | 116 | 96 |
| June | 10 | 256 |
| July | 1 | 362 |
| August | 3 | 322 |
| September | 55 | 157 |
| October | 283 | 35 |
| November | 616 | 2 |
| December | 950 | 0 |
| Year (annual) | 4,974 | 1,251 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00114400. 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.
Have recent years at Iuka (12 mi SW) been warmer than normal?
2023 averaged 56.3°F, 1.6°F above the 1991-2020 normal of 54.7°F. 2 of the 2 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 54.8°F | +0.1°F | 49.25 | – |
| 2023 | 56.3°F | +1.6°F | 37.13 | – |
Source: observed years: ACIS, station USC00114400. A year counts only with all twelve months complete.
How does Iuka (12 mi SW)'s climate compare?
Iuka (12 mi SW) is warmer than 116 of the 144 places with their own NOAA record in Illinois, and wetter than 117. Across the 7,247 U.S. stations with normals, its annual mean of 54.7°F is warmer than 59%.
In the Köppen classification computed from these normals, Iuka (12 mi SW) 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 Iuka (12 mi SW) share this climate record?
8 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.
- Centralia, IL11,787 people · 9 mi W
- Central City, IL1,067 people · 9 mi NW
- Wamac, IL965 people · 10 mi W
- Irvington, IL566 people · 11 mi W
- Junction City, IL523 people · 10 mi NW
- Dix, IL456 people · 4 mi S
- Kell, IL170 people · 4 mi E
- Walnut Hill, IL93 people · 4 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 Iuka (12 mi SW)'s climate
What is the coldest month at Iuka (12 mi SW)?
January, with a normal high of 39°F and a normal low of 21°F. The warmest is July (88°F by day, 66°F at night).
Does it snow at Iuka (12 mi SW)?
Yes: 12 inches in a normal year, falling on 9 days with 0.1 inch or more, the most in February (4.5 inches).
What is the rainiest month at Iuka (12 mi SW)?
May, with 5.20 in of precipitation in a normal year; the driest is February with 2.58 in.
What plant hardiness zone is Iuka (12 mi SW) in?
The USDA's 2023 map puts Iuka (12 mi SW) in zone 6b in ZIP code 62830, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −1°F (21 years, 1991-2020): zone 6b.
How late can frost come at Iuka (12 mi SW)?
In half of years the last 32°F night comes after April 9; in one year in ten it comes after April 25. Waiting until April 25 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Illinois climateThe statewide normals and every place in the state
- Salem, IL10 miles from this station, 54.9°F a year
- Mount Vernon, IL12 miles from this station, 54.5°F a year
- Carlyle, IL23 miles from this station, 55.7°F a year
- Nashville, IL24 miles from this station, 55.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made