Streamwood, Illinois climate: Normal weather by month, frost dates and records
Streamwood's normal year runs from 14°F January nights to 87°F July afternoons, with 38.0 inches of precipitation and 34 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.8°C, January lows of −10°C, July highs of 31°C, 966 mm of precipitation a year.
- NOAA stationStreamwood
- Station IDUSC00118324
- Location42.03°N 88.18°W
- Elevation819 ft (250 m)
- From the centerunder 1 mile
- Population38,360
On October 22, the normal high in Streamwood is 62°F and the normal low 38°F, and the chance of measurable rain or snow is 34%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Streamwood.
- Jan 32° 14°
- Feb 37° 16°
- Mar 48° 25°
- Apr 61° 35°
- May 73° 47°
- Jun 83° 57°
- Jul 87° 61°
- Aug 85° 60°
- Sep 78° 51°
- Oct 65° 40°
- Nov 50° 29°
- Dec 38° 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 Streamwood each month?
July is the warmest month, with normal highs of 87°F; January the coldest, with normal lows of 14°F. The most precipitation falls in June (4.72 in), the least in February (1.70 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 32°F | 14°F | 23.0°F | 1.90 | 11.9 | 10 | <1 | 30 | 9 h 30 min |
| February | 37°F | 16°F | 26.4°F | 1.70 | 6.0 | 9 | <1 | 27 | 10 h 30 min |
| March | 48°F | 25°F | 36.5°F | 2.09 | 4.8 | 11 | <1 | 24 | 11 h 50 min |
| April | 61°F | 35°F | 48.2°F | 3.64 | 0.7 | 13 | <1 | 13 | 13 h 20 min |
| May | 73°F | 47°F | 59.7°F | 4.66 | 0.0 | 13 | 2 | 2 | 14 h 30 min |
| June | 83°F | 57°F | 70.2°F | 4.72 | 0.0 | 12 | 8 | <1 | 15 h 10 min |
| July | 87°F | 61°F | 74.1°F | 3.34 | 0.0 | 9 | 10 | <1 | 15 h |
| August | 85°F | 60°F | 72.3°F | 4.45 | 0.0 | 11 | 7 | <1 | 14 h |
| September | 78°F | 51°F | 64.8°F | 3.58 | 0.0 | 8 | 2 | <1 | 12 h 30 min |
| October | 65°F | 40°F | 52.2°F | 3.51 | 0.1 | 10 | <1 | 8 | 11 h 10 min |
| November | 50°F | 29°F | 39.2°F | 2.51 | 1.8 | 10 | <1 | 21 | 9 h 50 min |
| December | 38°F | 19°F | 28.3°F | 1.92 | 8.7 | 12 | <1 | 29 | 9 h 10 min |
| Year (annual) | 61°F | 38°F | 49.6°F | 38.02 | 34.0 | 129 | 28 | 153 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 0°C | −10°C | −5.0°C | 48 mm | 30 cm |
| February | 3°C | −9°C | −3.1°C | 43 mm | 15 cm |
| March | 9°C | −4°C | 2.5°C | 53 mm | 12 cm |
| April | 16°C | 2°C | 9.0°C | 92 mm | 2 cm |
| May | 23°C | 8°C | 15.4°C | 118 mm | 0 cm |
| June | 29°C | 14°C | 21.2°C | 120 mm | 0 cm |
| July | 31°C | 16°C | 23.4°C | 85 mm | 0 cm |
| August | 29°C | 15°C | 22.4°C | 113 mm | 0 cm |
| September | 26°C | 11°C | 18.2°C | 91 mm | 0 cm |
| October | 18°C | 4°C | 11.2°C | 89 mm | 0 cm |
| November | 10°C | −2°C | 4.0°C | 64 mm | 5 cm |
| December | 3°C | −7°C | −2.1°C | 49 mm | 22 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00118324; 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 Streamwood?
Normal highs sit between 65°F and 85°F in May, June, August and September. 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 USC00118324.
When is the last frost in Streamwood?
In Streamwood, the last spring frost (32°F) comes after April 30 in half of years and after May 16 in one year in ten; the first autumn frost comes before October 13 in half of years and before September 29 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 301 year in 10 after May 16; 9 in 10 after April 17
- First autumn frost, half of years before
- October 131 year in 10 before September 29; 9 in 10 before October 25
NOAA puts the median frost-free season at 163 days, and the season without a hard freeze (28°F) at 184 days.
A hard freeze (28°F) comes after April 20 in half of springs and before October 24 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Streamwood in zone 5b in ZIP code 60107. By the map's own method, the average of each year's coldest night over 1991-2020, Streamwood's NOAA station is in zone 5b: the coldest night of a typical year reaches −12°F (16 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 USC00118324; 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 Streamwood?
In a normal year in Streamwood, 28 days a year reach 90°F (1 of them 100°F or more), 153 nights fall to 32°F or colder and 129 days bring measurable precipitation.
- Days at 90°F or more
- 28a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 153a normal year
- Days that stay below freezing
- 41high of 32°F or less
- Days with 0.01 inch of precipitation
- 129a normal year
- Days with 1 inch of snow or more
- 12a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00118324.
How sunny is Streamwood?
Over a year 72% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Streamwood, 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 Streamwood need?
A normal year in Streamwood brings 6,462 heating degree days, 20% more than the median U.S. place (5,373), and 879 cooling degree days, 3% 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 3,102 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,302 | 0 |
| February | 1,081 | 0 |
| March | 884 | 1 |
| April | 510 | 6 |
| May | 214 | 49 |
| June | 39 | 194 |
| July | 5 | 289 |
| August | 9 | 235 |
| September | 101 | 93 |
| October | 408 | 12 |
| November | 773 | 0 |
| December | 1,138 | 0 |
| Year (annual) | 6,462 | 879 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00118324. 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 Streamwood's climate compare?
Streamwood is warmer than 28 of the other 143 places with their own NOAA record in Illinois, and wetter than 31. Across the 7,247 U.S. stations with normals, its annual mean of 49.6°F is warmer than 38%.
In the Köppen classification computed from these normals, Streamwood 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 Streamwood 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.
- Schaumburg, ILalso near: Barrington (7 mi, 48.0°F a year); Chicago (8 mi, 51.2°F a year)77,099 people · 5 mi E
- Hoffman Estates, ILalso near: Barrington (4 mi, 48.0°F a year); Elgin (7 mi, 49.0°F a year)50,920 people · 3 mi NE
- Bartlett, IL40,718 people · 4 mi S
- Hanover Park, IL36,685 people · 3 mi SE
- Roselle, IL22,871 people · 6 mi SE
- Bloomingdale, IL22,622 people · 7 mi SE
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 Streamwood's climate
What is the coldest month in Streamwood?
January, with a normal high of 32°F and a normal low of 14°F. The warmest is July (87°F by day, 61°F at night).
Does it snow in Streamwood?
Yes: 34 inches in a normal year, falling on 33 days with 0.1 inch or more, the most in January (11.9 inches).
What is the rainiest month in Streamwood?
June, with 4.72 in of precipitation in a normal year; the driest is February with 1.70 in.
What plant hardiness zone is Streamwood in?
The USDA's 2023 map puts Streamwood in zone 5b in ZIP code 60107. By the same method at Streamwood's NOAA station, the coldest night of a typical year reaches −12°F (16 years, 1991-2020): zone 5b.
How late can frost come in Streamwood?
In half of years the last 32°F night comes after April 30; in one year in ten it comes after May 16. Waiting until May 16 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Illinois climateThe statewide normals and every place in the state
- Elgin, IL6 miles from this station, 49.0°F a year
- Barrington, IL6 miles from this station, 48.0°F a year
- West Chicago, IL9 miles from this station, 49.7°F a year
- Chicago, IL13 miles from this station, 51.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made