Antioch, Illinois climate: Normal weather by month, frost dates and records
Antioch's normal year runs from 15°F January nights to 82°F July afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.2°C, January lows of −10°C, July highs of 28°C.
- NOAA stationAntioch
- Station IDUSC00110203
- Location42.48°N 88.10°W
- Elevation750 ft (229 m)
- From the center2 miles
- Population15,108
On October 23, the normal high in Antioch is 58°F and the normal low 40°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Antioch.
- Jan 30° 15°
- Feb 33° 18°
- Mar 44° 27°
- Apr 56° 37°
- May 68° 48°
- Jun 78° 59°
- Jul 82° 64°
- Aug 81° 63°
- Sep 74° 55°
- Oct 61° 42°
- Nov 47° 31°
- Dec 35° 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 Antioch each month?
July is the warmest month, with normal highs of 82°F; January the coldest, with normal lows of 15°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 30°F | 15°F | 22.2°F | – | <1 | 29 | 9 h 20 min |
| February | 33°F | 18°F | 25.1°F | – | <1 | 25 | 10 h 30 min |
| March | 44°F | 27°F | 35.4°F | – | <1 | 23 | 11 h 50 min |
| April | 56°F | 37°F | 46.7°F | – | <1 | 8 | 13 h 20 min |
| May | 68°F | 48°F | 58.1°F | – | <1 | 1 | 14 h 30 min |
| June | 78°F | 59°F | 68.4°F | – | 3 | <1 | 15 h 20 min |
| July | 82°F | 64°F | 73.1°F | – | 4 | <1 | 15 h |
| August | 81°F | 63°F | 71.6°F | – | 3 | <1 | 14 h |
| September | 74°F | 55°F | 64.3°F | – | 1 | <1 | 12 h 30 min |
| October | 61°F | 42°F | 51.6°F | – | <1 | 4 | 11 h 10 min |
| November | 47°F | 31°F | 39.0°F | – | <1 | 17 | 9 h 50 min |
| December | 35°F | 21°F | 27.8°F | – | <1 | 27 | 9 h 10 min |
| Year (annual) | 57°F | 40°F | 48.6°F | – | 12 | 133 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | −1°C | −10°C | −5.4°C |
| February | 0°C | −8°C | −3.8°C |
| March | 7°C | −3°C | 1.9°C |
| April | 13°C | 3°C | 8.2°C |
| May | 20°C | 9°C | 14.5°C |
| June | 26°C | 15°C | 20.2°C |
| July | 28°C | 18°C | 22.8°C |
| August | 27°C | 17°C | 22.0°C |
| September | 23°C | 13°C | 17.9°C |
| October | 16°C | 6°C | 10.9°C |
| November | 8°C | 0°C | 3.9°C |
| December | 2°C | −6°C | −2.3°C |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Lake Villa (4 miles away), gets 43 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00110203; 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 Antioch?
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 USC00110203.
When is the last frost in Antioch?
In Antioch, the last spring frost (32°F) comes after April 23 in half of years and after May 9 in one year in ten; the first autumn frost comes before October 21 in half of years and before October 6 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 231 year in 10 after May 9; 9 in 10 after April 9
- First autumn frost, half of years before
- October 211 year in 10 before October 6; 9 in 10 before November 3
NOAA puts the median frost-free season at 179 days, and the season without a hard freeze (28°F) at 202 days.
A hard freeze (28°F) comes after April 11 in half of springs and before November 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Antioch in zone 5b in ZIP code 60002.
Frost dates for every NOAA station in Illinois · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00110203; 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 Antioch?
In a normal year in Antioch, 12 days a year reach 90°F and 133 nights fall to 32°F or colder.
- Days at 90°F or more
- 12a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 133a normal year
- Days that stay below freezing
- 50high of 32°F or less
The highest temperature in this station's record (since 1901) is 105°F, on July 5, 1911; the lowest is −29°F, on January 12, 1979.
The wettest calendar year on that record is 2000, with 49.21 in; the snowiest season is 1978–79, with 105.1 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00110203; records: ACIS (NOAA Regional Climate Centers), station USC00110203. Records use complete months only; a month missing more than three days is left out.
How sunny is Antioch?
Over a year 72% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Antioch, 3.9 kWh per square metre a day. July is the sunniest month (80%) and December the cloudiest (61%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 63% | 1.7 |
| February | 67% | 2.6 |
| March | 67% | 3.6 |
| April | 69% | 4.7 |
| May | 70% | 5.5 |
| June | 76% | 6.1 |
| July | 80% | 6.3 |
| August | 79% | 5.4 |
| September | 78% | 4.3 |
| October | 69% | 2.8 |
| November | 66% | 1.9 |
| December | 61% | 1.4 |
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 Antioch need?
A normal year in Antioch brings 6,704 heating degree days, 25% more than the median U.S. place (5,373), and 766 cooling degree days, 16% 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 2,897 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,327 | 0 |
| February | 1,118 | 0 |
| March | 918 | 0 |
| April | 553 | 4 |
| May | 253 | 39 |
| June | 55 | 157 |
| July | 5 | 256 |
| August | 9 | 214 |
| September | 107 | 86 |
| October | 425 | 9 |
| November | 780 | 0 |
| December | 1,153 | 0 |
| Year (annual) | 6,704 | 766 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00110203. 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 Antioch's climate compare?
Antioch is warmer than 14 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 48.6°F is warmer than 34%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Which places near Antioch share this climate record?
6 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.
- Salem Lakes, WI14,302 people · 4 mi NW
- Twin Lakes, WI6,328 people · 8 mi W
- Bristol, WI5,239 people · 6 mi NE
- Powers Lake, WI1,378 people · 11 mi NW
- Lily Lake, WI639 people · 8 mi NW
- New Munster, WI292 people · 9 mi NW
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 Antioch's climate
What is the coldest month in Antioch?
January, with a normal high of 30°F and a normal low of 15°F. The warmest is July (82°F by day, 64°F at night).
Does it snow in Antioch?
Yes. NOAA publishes no 1991-2020 snowfall normal for Antioch's NOAA station; the nearest record that keeps one, Lake Villa (4 miles away), records 43 inches of snow in a normal year.
What plant hardiness zone is Antioch in?
The USDA's 2023 map puts Antioch in zone 5b in ZIP code 60002.
How late can frost come in Antioch?
In half of years the last 32°F night comes after April 23; in one year in ten it comes after May 9. Waiting until May 9 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Illinois climateThe statewide normals and every place in the state
- Lake Villa, IL4 miles from this station, 48.6°F a year
- Paddock Lake, WI7 miles from this station, 47.4°F a year
- Kenosha, WI11 miles from this station, 49.2°F a year
- Pell Lake, WI12 miles from this station, 47.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made