Streator, Illinois climate: Normal weather by month, frost dates and records
Streator's normal year runs from 16°F January nights to 88°F July afternoons, with 39.4 inches of precipitation and 26 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.9°C, January lows of −9°C, July highs of 31°C, 1,002 mm of precipitation a year.
- NOAA stationStreator (3 mi SE)
- Station IDUSC00118353
- Location41.09°N 88.82°W
- Elevation610 ft (186 m)
- From the center2 miles
- Population12,295
On October 23, the normal high in Streator is 61°F and the normal low 41°F, and the chance of measurable rain or snow is 30%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Streator.
- Jan 32° 16°
- Feb 37° 19°
- Mar 49° 29°
- Apr 62° 40°
- May 74° 52°
- Jun 84° 62°
- Jul 88° 66°
- Aug 84° 64°
- Sep 78° 55°
- Oct 65° 44°
- Nov 49° 32°
- Dec 37° 22°
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 Streator each month?
July is the warmest month, with normal highs of 88°F; January the coldest, with normal lows of 16°F. The most precipitation falls in May (4.69 in), the least in February (1.92 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 32°F | 16°F | 23.9°F | 2.56 | 9.6 | 9 | <1 | 29 | 9 h 30 min |
| February | 37°F | 19°F | 28.0°F | 1.92 | 4.8 | 8 | <1 | 25 | 10 h 40 min |
| March | 49°F | 29°F | 39.1°F | 2.78 | 3.7 | 10 | <1 | 19 | 11 h 50 min |
| April | 62°F | 40°F | 51.3°F | 3.73 | 0.7 | 12 | <1 | 5 | 13 h 20 min |
| May | 74°F | 52°F | 62.7°F | 4.69 | 0.0 | 12 | 2 | <1 | 14 h 30 min |
| June | 84°F | 62°F | 73.2°F | 4.67 | 0.0 | 11 | 8 | <1 | 15 h 10 min |
| July | 88°F | 66°F | 76.5°F | 4.10 | 0.0 | 9 | 14 | <1 | 14 h 50 min |
| August | 84°F | 64°F | 73.9°F | 3.70 | 0.0 | 9 | 6 | <1 | 13 h 50 min |
| September | 78°F | 55°F | 66.4°F | 3.56 | 0.0 | 7 | 3 | <1 | 12 h 30 min |
| October | 65°F | 44°F | 54.3°F | 2.98 | 0.0 | 9 | <1 | 2 | 11 h 10 min |
| November | 49°F | 32°F | 40.8°F | 2.57 | 0.8 | 9 | <1 | 15 | 10 h |
| December | 37°F | 22°F | 29.7°F | 2.17 | 6.8 | 9 | <1 | 24 | 9 h 10 min |
| Year (annual) | 62°F | 42°F | 51.6°F | 39.43 | 26.4 | 113 | 33 | 118 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 0°C | −9°C | −4.5°C | 65 mm | 24 cm |
| February | 3°C | −7°C | −2.2°C | 49 mm | 12 cm |
| March | 9°C | −1°C | 3.9°C | 71 mm | 9 cm |
| April | 17°C | 5°C | 10.7°C | 95 mm | 2 cm |
| May | 23°C | 11°C | 17.1°C | 119 mm | 0 cm |
| June | 29°C | 17°C | 22.9°C | 119 mm | 0 cm |
| July | 31°C | 19°C | 24.7°C | 104 mm | 0 cm |
| August | 29°C | 18°C | 23.3°C | 94 mm | 0 cm |
| September | 25°C | 13°C | 19.1°C | 90 mm | 0 cm |
| October | 18°C | 7°C | 12.4°C | 76 mm | 0 cm |
| November | 10°C | 0°C | 4.9°C | 65 mm | 2 cm |
| December | 3°C | −5°C | −1.3°C | 55 mm | 17 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00118353; 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 Streator?
Normal highs sit between 65°F and 85°F in May, June, August and September. 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 USC00118353.
When is the last frost in Streator?
In Streator, the last spring frost (32°F) comes after April 12 in half of years and after April 25 in one year in ten; the first autumn frost comes before October 28 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 121 year in 10 after April 25; 9 in 10 after March 30
- First autumn frost, half of years before
- October 281 year in 10 before October 16; 9 in 10 before November 11
NOAA puts the median frost-free season at 199 days, and the season without a hard freeze (28°F) at 222 days.
A hard freeze (28°F) comes after April 1 in half of springs and before November 8 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Streator in zone 5b in ZIP code 61364, 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 USC00118353; 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 Streator?
In a normal year in Streator, 33 days a year reach 90°F (2 of them 100°F or more), 118 nights fall to 32°F or colder and 113 days bring measurable precipitation.
- Days at 90°F or more
- 33a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 118a normal year
- Days that stay below freezing
- 34high of 32°F or less
- Days with 0.01 inch of precipitation
- 113a normal year
- Days with 1 inch of snow or more
- 11a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00118353.
How sunny is Streator?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Streator, 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 Streator need?
A normal year in Streator brings 5,943 heating degree days, 11% more than the median U.S. place (5,373), and 1,107 cooling degree days, 22% more 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 3,519 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,274 | 0 |
| February | 1,036 | 0 |
| March | 805 | 2 |
| April | 418 | 6 |
| May | 152 | 79 |
| June | 9 | 253 |
| July | 1 | 357 |
| August | 3 | 278 |
| September | 75 | 117 |
| October | 348 | 15 |
| November | 728 | 1 |
| December | 1,094 | 0 |
| Year (annual) | 5,943 | 1,107 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00118353. 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 Streator's climate compare?
Streator is warmer than 68 of the other 143 places with their own NOAA record in Illinois, and wetter than 63. Across the 7,247 U.S. stations with normals, its annual mean of 51.6°F is warmer than 48%.
In the Köppen classification computed from these normals, Streator 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 Streator share this climate record?
5 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.
- Cornell, IL441 people · 8 mi SE
- Lostant, IL430 people · 13 mi W
- Ransom, IL309 people · 10 mi NE
- Kangley, IL229 people · 5 mi NW
- Long Point, IL199 people · 7 mi SW
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 Streator's climate
What is the coldest month in Streator?
January, with a normal high of 32°F and a normal low of 16°F. The warmest is July (88°F by day, 66°F at night).
Does it snow in Streator?
Yes: 26 inches in a normal year, falling on 15 days with 0.1 inch or more, the most in January (9.6 inches).
What is the rainiest month in Streator?
May, with 4.69 in of precipitation in a normal year; the driest is February with 1.92 in.
What plant hardiness zone is Streator in?
The USDA's 2023 map puts Streator in zone 5b in ZIP code 61364, the nearest ZIP area.
How late can frost come in Streator?
In half of years the last 32°F night comes after April 12; 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
- Marseilles, IL17 miles from this station, 49.7°F a year
- Minonk, IL17 miles from this station, 51.3°F a year
- Ottawa, IL17 miles from this station, 50.2°F a year
- Pontiac, IL17 miles from this station, 51.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made