Carlyle, Illinois climate: Normal weather by month, frost dates and records
Carlyle's normal year runs from 22°F January nights to 88°F July afternoons, with 45.9 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 13.2°C, January lows of −6°C, July highs of 31°C, 1,165 mm of precipitation a year.
- NOAA stationCarlyle Reservoir
- Station IDUSC00111290
- Location38.63°N 89.36°W
- Elevation501 ft (153 m)
- Population3,208
On October 14, the normal high in Carlyle is 71°F and the normal low 47°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 Carlyle.
- Jan 39° 22°
- Feb 45° 25°
- Mar 55° 35°
- Apr 67° 45°
- May 76° 56°
- Jun 85° 65°
- Jul 88° 68°
- Aug 87° 66°
- Sep 81° 58°
- Oct 70° 46°
- Nov 55° 36°
- 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 in Carlyle each month?
July is the warmest month, with normal highs of 88°F; January the coldest, with normal lows of 22°F. The most precipitation falls in May (5.23 in), the least in February (2.45 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 39°F | 22°F | 30.3°F | 3.05 | 10 | <1 | 27 | 9 h 40 min |
| February | 45°F | 25°F | 34.8°F | 2.45 | 9 | <1 | 22 | 10 h 40 min |
| March | 55°F | 35°F | 44.6°F | 3.67 | 11 | <1 | 13 | 11 h 50 min |
| April | 67°F | 45°F | 55.7°F | 4.90 | 11 | <1 | 3 | 13 h 10 min |
| May | 76°F | 56°F | 65.9°F | 5.23 | 12 | 1 | <1 | 14 h 10 min |
| June | 85°F | 65°F | 74.9°F | 4.87 | 11 | 7 | <1 | 14 h 50 min |
| July | 88°F | 68°F | 78.2°F | 4.24 | 9 | 12 | <1 | 14 h 40 min |
| August | 87°F | 66°F | 76.8°F | 3.59 | 8 | 9 | <1 | 13 h 40 min |
| September | 81°F | 58°F | 69.5°F | 3.65 | 8 | 3 | <1 | 12 h 30 min |
| October | 70°F | 46°F | 57.9°F | 3.39 | 9 | <1 | 2 | 11 h 20 min |
| November | 55°F | 36°F | 45.3°F | 3.72 | 9 | <1 | 12 | 10 h 10 min |
| December | 43°F | 26°F | 34.8°F | 3.10 | 11 | <1 | 23 | 9 h 30 min |
| Year (annual) | 66°F | 46°F | 55.7°F | 45.86 | 118 | 32 | 101 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 4°C | −6°C | −0.9°C | 77 mm |
| February | 7°C | −4°C | 1.6°C | 62 mm |
| March | 13°C | 1°C | 7.0°C | 93 mm |
| April | 19°C | 7°C | 13.2°C | 124 mm |
| May | 24°C | 13°C | 18.8°C | 133 mm |
| June | 29°C | 18°C | 23.8°C | 124 mm |
| July | 31°C | 20°C | 25.7°C | 108 mm |
| August | 31°C | 19°C | 24.9°C | 91 mm |
| September | 27°C | 15°C | 20.8°C | 93 mm |
| October | 21°C | 8°C | 14.4°C | 86 mm |
| November | 13°C | 2°C | 7.4°C | 94 mm |
| December | 6°C | −3°C | 1.6°C | 79 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Nashville (20 miles away), gets 12 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00111290; 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 Carlyle?
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 (8).
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 USC00111290.
When is the last frost in Carlyle?
In Carlyle, the last spring frost (32°F) comes after April 6 in half of years and after April 22 in one year in ten; the first autumn frost comes before October 29 in half of years and before October 16 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 61 year in 10 after April 22; 9 in 10 after March 23
- First autumn frost, half of years before
- October 291 year in 10 before October 16; 9 in 10 before November 12
NOAA puts the median frost-free season at 204 days, and the season without a hard freeze (28°F) at 226 days.
A hard freeze (28°F) comes after March 28 in half of springs and before November 8 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Carlyle in zone 6b in ZIP code 62231, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Carlyle's NOAA station is in zone 6b: the coldest night of a typical year reaches −2°F (18 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 USC00111290; 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 Carlyle?
In a normal year in Carlyle, 32 days a year reach 90°F (1 of them 100°F or more), 101 nights fall to 32°F or colder and 118 days bring measurable precipitation.
- Days at 90°F or more
- 32a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 101a normal year
- Days that stay below freezing
- 25high of 32°F or less
- Days with 0.01 inch of precipitation
- 118a normal year
The highest temperature in this station's record (since 1962) is 105°F, on July 8, 2012; the lowest is −22°F, on January 19, 1994.
The wettest calendar year on that record is 2024, with 58.84 in; the snowiest season is 1976–77, with 29.3 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00111290; records: ACIS (NOAA Regional Climate Centers), station USC00111290. Records use complete months only; a month missing more than three days is left out.
How sunny is Carlyle?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Carlyle, 4.2 kWh per square metre a day. August is the sunniest month (83%) and December the cloudiest (64%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 66% | 2.1 |
| February | 66% | 2.8 |
| March | 67% | 3.8 |
| April | 73% | 5.0 |
| May | 74% | 5.6 |
| June | 81% | 6.5 |
| July | 83% | 6.3 |
| August | 83% | 5.7 |
| September | 81% | 4.8 |
| October | 76% | 3.4 |
| November | 72% | 2.4 |
| December | 64% | 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 much heating and cooling does Carlyle need?
A normal year in Carlyle brings 4,780 heating degree days, 11% fewer than the median U.S. place (5,373), and 1,438 cooling degree days, 58% 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 4,186 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,075 | 0 |
| February | 844 | 0 |
| March | 634 | 4 |
| April | 302 | 22 |
| May | 90 | 117 |
| June | 7 | 302 |
| July | 0 | 409 |
| August | 1 | 367 |
| September | 41 | 177 |
| October | 258 | 38 |
| November | 593 | 2 |
| December | 936 | 0 |
| Year (annual) | 4,780 | 1,438 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00111290. 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 Carlyle been warmer than normal lately?
2025 averaged 56.4°F, 0.7°F above the 1991-2020 normal of 55.7°F. 3 of the 3 complete years since 2023 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2023 | 58.0°F | +2.3°F | 35.42 |
| 2024 | 58.4°F | +2.7°F | 58.84 |
| 2025 | 56.4°F | +0.7°F | 40.19 |
Over 31 complete years from 1965 to 2025, the station's annual mean temperature rose at a fitted 3.6°F per century (+0.20°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00111290; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Carlyle's climate compare?
Carlyle is warmer than 127 of the other 143 places with their own NOAA record in Illinois, and wetter than 121. Across the 7,247 U.S. stations with normals, its annual mean of 55.7°F is warmer than 63%.
In the Köppen classification computed from these normals, Carlyle 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 Carlyle 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.
- Breese, IL4,629 people · 9 mi W
- Aviston, IL2,434 people · 13 mi W
- Germantown, IL1,387 people · 11 mi SW
- Beckemeyer, IL923 people · 4 mi W
- Pocahontas, IL669 people · 17 mi NW
- Bartelso, IL639 people · 8 mi SW
- St. Rose, IL466 people · 11 mi W
- Pierron, IL445 people · 16 mi NW
- Hoffman, IL431 people · 8 mi SE
- Keyesport, IL403 people · 10 mi NE
- Grantfork, IL339 people · 21 mi NW
- Huey, IL162 people · 4 mi E
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 Carlyle's climate
What is the coldest month in Carlyle?
January, with a normal high of 39°F and a normal low of 22°F. The warmest is July (88°F by day, 68°F at night).
Does it snow in Carlyle?
Yes. NOAA publishes no 1991-2020 snowfall normal for Carlyle's NOAA station; the nearest record that keeps one, Nashville (20 miles away), records 12 inches of snow in a normal year.
What is the rainiest month in Carlyle?
May, with 5.23 in of precipitation in a normal year; the driest is February with 2.45 in.
What plant hardiness zone is Carlyle in?
The USDA's 2023 map puts Carlyle in zone 6b in ZIP code 62231, the nearest ZIP area. By the same method at Carlyle's NOAA station, the coldest night of a typical year reaches −2°F (18 years, 1991-2020): zone 6b.
How late can frost come in Carlyle?
In half of years the last 32°F night comes after April 6; in one year in ten it comes after April 22. Waiting until April 22 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Illinois climateThe statewide normals and every place in the state
- Nashville, IL19 miles from this station, 55.1°F a year
- Salem, IL22 miles from this station, 54.9°F a year
- Iuka (12 mi SW), IL23 miles from this station, 54.7°F a year
- Belleville, IL27 miles from this station, 57.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made