Lisle, Illinois climate: Normal weather by month, frost dates and records
Lisle's normal year runs from 15°F January nights to 84°F July afternoons, with 40.2 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.6°C, January lows of −10°C, July highs of 29°C, 1,021 mm of precipitation a year.
- NOAA stationLisle-Morton Arboretum
- Station IDUSC00115097
- Location41.81°N 88.07°W
- Elevation680 ft (207 m)
- From the center2 miles
- Population23,548
On October 14, the normal high in Lisle is 64°F and the normal low 41°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Lisle.
- Jan 32° 15°
- Feb 35° 18°
- Mar 47° 26°
- Apr 59° 36°
- May 71° 47°
- Jun 81° 58°
- Jul 84° 62°
- Aug 83° 60°
- Sep 76° 52°
- Oct 63° 40°
- Nov 48° 30°
- Dec 37° 21°
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 Lisle each month?
July is the warmest month, with normal highs of 84°F; January the coldest, with normal lows of 15°F. The most precipitation falls in May (4.79 in), the least in February (1.96 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 32°F | 15°F | 23.1°F | 2.19 | – | <1 | 29 | 9 h 30 min |
| February | 35°F | 18°F | 26.4°F | 1.96 | – | <1 | 26 | 10 h 30 min |
| March | 47°F | 26°F | 36.7°F | 2.36 | – | <1 | 23 | 11 h 50 min |
| April | 59°F | 36°F | 47.7°F | 3.82 | – | <1 | 11 | 13 h 20 min |
| May | 71°F | 47°F | 59.0°F | 4.79 | – | 1 | 1 | 14 h 30 min |
| June | 81°F | 58°F | 69.3°F | 4.43 | – | 4 | <1 | 15 h 10 min |
| July | 84°F | 62°F | 73.1°F | 4.25 | – | 7 | <1 | 15 h |
| August | 83°F | 60°F | 71.4°F | 4.35 | – | 3 | <1 | 13 h 50 min |
| September | 76°F | 52°F | 64.2°F | 3.36 | – | 2 | <1 | 12 h 30 min |
| October | 63°F | 40°F | 51.5°F | 3.58 | – | <1 | 7 | 11 h 10 min |
| November | 48°F | 30°F | 39.2°F | 2.77 | – | <1 | 19 | 9 h 50 min |
| December | 37°F | 21°F | 28.6°F | 2.32 | – | <1 | 27 | 9 h 10 min |
| Year (annual) | 60°F | 39°F | 49.2°F | 40.18 | – | 17 | 144 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 0°C | −10°C | −4.9°C | 56 mm |
| February | 2°C | −8°C | −3.1°C | 50 mm |
| March | 8°C | −3°C | 2.6°C | 60 mm |
| April | 15°C | 2°C | 8.7°C | 97 mm |
| May | 21°C | 9°C | 15.0°C | 122 mm |
| June | 27°C | 14°C | 20.7°C | 113 mm |
| July | 29°C | 17°C | 22.8°C | 108 mm |
| August | 28°C | 16°C | 21.9°C | 110 mm |
| September | 24°C | 11°C | 17.9°C | 85 mm |
| October | 17°C | 5°C | 10.8°C | 91 mm |
| November | 9°C | −1°C | 4.0°C | 70 mm |
| December | 3°C | −6°C | −1.9°C | 59 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Wheaton (0 miles away), gets 24 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00115097; 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 Lisle?
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 USC00115097.
When is the last frost in Lisle?
In Lisle, the last spring frost (32°F) comes after April 28 in half of years and after May 14 in one year in ten; the first autumn frost comes before October 16 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 281 year in 10 after May 14; 9 in 10 after April 14
- First autumn frost, half of years before
- October 161 year in 10 before October 1; 9 in 10 before October 29
NOAA puts the median frost-free season at 169 days, and the season without a hard freeze (28°F) at 190 days.
A hard freeze (28°F) comes after April 16 in half of springs and before October 26 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Lisle in zone 5b in ZIP code 60532. By the map's own method, the average of each year's coldest night over 1991-2020, Lisle's NOAA station is in zone 5b: the coldest night of a typical year reaches −10°F (26 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 USC00115097; 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 Lisle?
In a normal year in Lisle, 17 days a year reach 90°F and 144 nights fall to 32°F or colder.
- Days at 90°F or more
- 17a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 144a normal year
- Days that stay below freezing
- 45high of 32°F or less
The highest temperature in this station's record (since 1895) is 105°F, on July 25, 1940; the lowest is −26°F, on January 20, 1985.
The wettest calendar year on that record is 2008, with 51.06 in; the snowiest season is 1951–52, with 65.1 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00115097; records: ACIS (NOAA Regional Climate Centers), station USC00115097. Records use complete months only; a month missing more than three days is left out.
How sunny is Lisle?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Lisle, 3.9 kWh per square metre a day. July is the sunniest month (81%) and January the cloudiest (61%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 61% | 1.7 |
| February | 65% | 2.6 |
| March | 67% | 3.6 |
| April | 70% | 4.8 |
| May | 71% | 5.5 |
| June | 77% | 6.1 |
| July | 81% | 6.2 |
| August | 80% | 5.4 |
| September | 80% | 4.5 |
| October | 71% | 3.0 |
| November | 67% | 2.0 |
| December | 61% | 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 Lisle need?
A normal year in Lisle brings 6,506 heating degree days, 21% more than the median U.S. place (5,373), and 775 cooling degree days, 15% 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 2,957 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,299 | 0 |
| February | 1,079 | 0 |
| March | 880 | 2 |
| April | 524 | 3 |
| May | 232 | 46 |
| June | 33 | 162 |
| July | 7 | 258 |
| August | 12 | 211 |
| September | 110 | 84 |
| October | 428 | 9 |
| November | 776 | 0 |
| December | 1,128 | 0 |
| Year (annual) | 6,506 | 775 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00115097. 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 Lisle been warmer than normal lately?
2023 averaged 50.0°F, 0.8°F above the 1991-2020 normal of 49.2°F. 2 of the 2 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 50.8°F | +1.6°F | 31.42 |
| 2023 | 50.0°F | +0.8°F | 37.91 |
Source: observed years: ACIS, station USC00115097. A year counts only with all twelve months complete.
How does Lisle's climate compare?
Lisle is warmer than 20 of the other 143 places with their own NOAA record in Illinois, and wetter than 75. Across the 7,247 U.S. stations with normals, its annual mean of 49.2°F is warmer than 37%.
In the Köppen classification computed from these normals, Lisle 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 Lisle 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.
- Naperville, ILalso near: Wheaton (6 mi, 51.1°F a year); Aurora (8 mi, 50.2°F a year)153,124 people · 6 mi SW
- Downers Grove, ILalso near: Wheaton (3 mi, 51.1°F a year); Little Red School House (10 mi, 51.4°F a year)50,552 people · 3 mi SE
- Lombard, IL44,490 people · 5 mi NE
- Woodridge, IL34,103 people · 5 mi S
- Glendale Heights, IL32,866 people · 7 mi N
- Glen Ellyn, IL28,872 people · 4 mi N
- Westmont, IL24,308 people · 5 mi E
- Villa Park, IL22,020 people · 7 mi NE
- Warrenville, IL15,247 people · 6 mi W
- Clarendon Hills, IL8,703 people · 6 mi E
- Oak Brook, IL8,188 people · 6 mi E
- Oakbrook Terrace, IL2,729 people · 6 mi NE
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 Lisle's climate
What is the coldest month in Lisle?
January, with a normal high of 32°F and a normal low of 15°F. The warmest is July (84°F by day, 62°F at night).
Does it snow in Lisle?
Yes. NOAA publishes no 1991-2020 snowfall normal for Lisle's NOAA station; the nearest record that keeps one, Wheaton (0 miles away), records 24 inches of snow in a normal year.
What is the rainiest month in Lisle?
May, with 4.79 in of precipitation in a normal year; the driest is February with 1.96 in.
What plant hardiness zone is Lisle in?
The USDA's 2023 map puts Lisle in zone 5b in ZIP code 60532. By the same method at Lisle's NOAA station, the coldest night of a typical year reaches −10°F (26 years, 1991-2020): zone 5b.
How late can frost come in Lisle?
In half of years the last 32°F night comes after April 28; 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
- Wheaton, IL0 miles from this station, 51.1°F a year
- West Chicago, IL11 miles from this station, 49.7°F a year
- Aurora, IL12 miles from this station, 50.2°F a year
- Little Red School House, IL12 miles from this station, 51.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made