Compton, Illinois climate: Normal weather by month, frost dates and records
Compton's normal year runs from 12°F January nights to 83°F July afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.0°C, January lows of −11°C, July highs of 28°C.
- NOAA stationCompton (1 mi NW)
- Station IDUSC00111835
- Location41.71°N 89.10°W
- Elevation905 ft (276 m)
- From the center1 miles
- Population266
On October 22, the normal high in Compton is 60°F and the normal low 38°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Compton.
- Jan 28° 12°
- Feb 33° 16°
- Mar 46° 26°
- Apr 59° 36°
- May 71° 49°
- Jun 80° 58°
- Jul 83° 61°
- Aug 81° 60°
- Sep 75° 51°
- Oct 63° 40°
- Nov 47° 29°
- Dec 34° 19°
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 Compton each month?
July is the warmest month, with normal highs of 83°F; January the coldest, with normal lows of 12°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 28°F | 12°F | 20.2°F | – | <1 | 30 | 9 h 30 min |
| February | 33°F | 16°F | 24.5°F | – | <1 | 26 | 10 h 30 min |
| March | 46°F | 26°F | 35.8°F | – | <1 | 24 | 11 h 50 min |
| April | 59°F | 36°F | 47.6°F | – | <1 | 11 | 13 h 20 min |
| May | 71°F | 49°F | 59.7°F | – | 1 | 1 | 14 h 30 min |
| June | 80°F | 58°F | 68.7°F | – | 5 | <1 | 15 h 10 min |
| July | 83°F | 61°F | 72.0°F | – | 4 | <1 | 15 h |
| August | 81°F | 60°F | 70.4°F | – | 3 | <1 | 13 h 50 min |
| September | 75°F | 51°F | 63.3°F | – | 1 | 1 | 12 h 30 min |
| October | 63°F | 40°F | 51.2°F | – | <1 | 8 | 11 h 10 min |
| November | 47°F | 29°F | 38.1°F | – | <1 | 19 | 9 h 50 min |
| December | 34°F | 19°F | 26.4°F | – | <1 | 29 | 9 h 10 min |
| Year (annual) | 58°F | 38°F | 48.2°F | – | 14 | 149 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | −2°C | −11°C | −6.6°C |
| February | 1°C | −9°C | −4.2°C |
| March | 8°C | −4°C | 2.1°C |
| April | 15°C | 2°C | 8.7°C |
| May | 22°C | 9°C | 15.4°C |
| June | 26°C | 14°C | 20.4°C |
| July | 28°C | 16°C | 22.2°C |
| August | 27°C | 15°C | 21.3°C |
| September | 24°C | 11°C | 17.4°C |
| October | 17°C | 4°C | 10.7°C |
| November | 9°C | −2°C | 3.4°C |
| December | 1°C | −7°C | −3.1°C |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Paw Paw (7 miles away), gets 30 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00111835; 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 Compton?
Normal highs sit between 65°F and 85°F in May, June, July, August and September.
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 USC00111835.
When is the last frost in Compton?
In Compton, the last spring frost (32°F) comes after April 27 in half of years and after May 14 in one year in ten; the first autumn frost comes before October 12 in half of years and before September 27 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 271 year in 10 after May 14; 9 in 10 after April 12
- First autumn frost, half of years before
- October 121 year in 10 before September 27; 9 in 10 before October 25
NOAA puts the median frost-free season at 167 days, and the season without a hard freeze (28°F) at 187 days.
A hard freeze (28°F) comes after April 16 in half of springs and before October 24 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Compton in zone 5b in ZIP code 61318, the nearest ZIP area.
Frost dates for every NOAA station in Illinois · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00111835; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Compton?
In a normal year in Compton, 14 days a year reach 90°F and 149 nights fall to 32°F or colder.
- Days at 90°F or more
- 14a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 149a normal year
- Days that stay below freezing
- 48high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00111835.
How sunny is Compton?
Over a year 74% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Compton, 4.0 kWh per square metre a day. July is the sunniest month (81%) and December the cloudiest (63%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 64% | 1.8 |
| February | 68% | 2.7 |
| March | 68% | 3.7 |
| April | 70% | 4.8 |
| May | 72% | 5.5 |
| June | 77% | 6.2 |
| July | 81% | 6.3 |
| August | 80% | 5.5 |
| September | 80% | 4.5 |
| October | 72% | 3.0 |
| November | 68% | 2.0 |
| December | 63% | 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 Compton need?
A normal year in Compton brings 6,794 heating degree days, 26% more than the median U.S. place (5,373), and 695 cooling degree days, 23% 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 2,856 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,387 | 0 |
| February | 1,134 | 0 |
| March | 905 | 0 |
| April | 527 | 6 |
| May | 212 | 47 |
| June | 44 | 154 |
| July | 8 | 225 |
| August | 16 | 183 |
| September | 124 | 71 |
| October | 435 | 7 |
| November | 807 | 0 |
| December | 1,197 | 0 |
| Year (annual) | 6,794 | 695 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00111835. 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 Compton's climate compare?
Compton is warmer than 9 of the other 143 places with their own NOAA record in Illinois. Across the 7,247 U.S. stations with normals, its annual mean of 48.2°F is warmer than 33%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Which places near Compton share this climate record?
3 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.
- Sublette, IL372 people · 8 mi SW
- West Brooklyn, IL128 people · 3 mi W
- Lee Center, IL0 people · 10 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 Compton's climate
What is the coldest month in Compton?
January, with a normal high of 28°F and a normal low of 12°F. The warmest is July (83°F by day, 61°F at night).
Does it snow in Compton?
Yes. NOAA publishes no 1991-2020 snowfall normal for Compton's NOAA station; the nearest record that keeps one, Paw Paw (7 miles away), records 30 inches of snow in a normal year.
What plant hardiness zone is Compton in?
The USDA's 2023 map puts Compton in zone 5b in ZIP code 61318, the nearest ZIP area.
How late can frost come in Compton?
In half of years the last 32°F night comes after April 27; in one year in ten it comes after May 14. Waiting until May 14 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Illinois climateThe statewide normals and every place in the state
- Paw Paw, IL7 miles from this station, 47.8°F a year
- Rochelle, IL14 miles from this station, 47.9°F a year
- Shabbona, IL16 miles from this station, 47.8°F a year
- DeKalb, IL23 miles from this station, 48.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made