Hales Corners, Wisconsin climate: Normal weather by month, frost dates and records
Hales Corners's normal year runs from 12°F January nights to 83°F July afternoons, with 38.4 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.5°C, January lows of −11°C, July highs of 28°C, 976 mm of precipitation a year.
- NOAA stationHales Corners/Whitnall Park/Bo
- Station IDUSC00473391
- Location42.94°N 88.03°W
- Elevation774 ft (236 m)
- From the center1 miles
- Population7,766
On October 14, the normal high in Hales Corners is 63°F and the normal low 40°F, and the chance of measurable rain or snow is 36%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Hales Corners.
- Jan 30° 12°
- Feb 33° 15°
- Mar 44° 24°
- Apr 56° 35°
- May 68° 46°
- Jun 78° 56°
- Jul 83° 61°
- Aug 81° 59°
- Sep 74° 51°
- Oct 62° 40°
- Nov 47° 29°
- Dec 35° 18°
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 Hales Corners each month?
July is the warmest month, with normal highs of 83°F; January the coldest, with normal lows of 12°F. The most precipitation falls in June (5.63 in), the least in January (1.80 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 30°F | 12°F | 21.0°F | 1.80 | 10 | <1 | 30 | 9 h 20 min |
| February | 33°F | 15°F | 23.9°F | 1.87 | 9 | <1 | 27 | 10 h 30 min |
| March | 44°F | 24°F | 34.0°F | 2.07 | 8 | <1 | 26 | 11 h 50 min |
| April | 56°F | 35°F | 45.2°F | 4.10 | 11 | <1 | 14 | 13 h 20 min |
| May | 68°F | 46°F | 56.8°F | 4.28 | 13 | 1 | 2 | 14 h 40 min |
| June | 78°F | 56°F | 66.8°F | 5.63 | 12 | 2 | <1 | 15 h 20 min |
| July | 83°F | 61°F | 71.7°F | 3.75 | 9 | 5 | <1 | 15 h |
| August | 81°F | 59°F | 70.1°F | 3.79 | 10 | 3 | <1 | 14 h |
| September | 74°F | 51°F | 62.7°F | 3.77 | 10 | 1 | <1 | 12 h 30 min |
| October | 62°F | 40°F | 50.6°F | 3.01 | 12 | <1 | 9 | 11 h 10 min |
| November | 47°F | 29°F | 37.5°F | 2.28 | 9 | <1 | 22 | 9 h 50 min |
| December | 35°F | 18°F | 26.7°F | 2.09 | 10 | <1 | 29 | 9 h |
| Year (annual) | 58°F | 37°F | 47.3°F | 38.44 | 121 | 12 | 159 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −1°C | −11°C | −6.1°C | 46 mm |
| February | 1°C | −10°C | −4.5°C | 47 mm |
| March | 7°C | −5°C | 1.1°C | 53 mm |
| April | 13°C | 1°C | 7.3°C | 104 mm |
| May | 20°C | 8°C | 13.8°C | 109 mm |
| June | 25°C | 13°C | 19.3°C | 143 mm |
| July | 28°C | 16°C | 22.1°C | 95 mm |
| August | 27°C | 15°C | 21.2°C | 96 mm |
| September | 23°C | 11°C | 17.1°C | 96 mm |
| October | 16°C | 4°C | 10.3°C | 76 mm |
| November | 8°C | −2°C | 3.1°C | 58 mm |
| December | 2°C | −8°C | −2.9°C | 53 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, West Allis (6 miles away), gets 52 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00473391; 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 Hales Corners?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, July has the fewest days with rain (9).
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 USC00473391.
When is the last frost in Hales Corners?
In Hales Corners, the last spring frost (32°F) comes after May 3 in half of years and after May 19 in one year in ten; the first autumn frost comes before October 14 in half of years and before September 30 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
- May 31 year in 10 after May 19; 9 in 10 after April 18
- First autumn frost, half of years before
- October 141 year in 10 before September 30; 9 in 10 before October 26
NOAA puts the median frost-free season at 162 days, and the season without a hard freeze (28°F) at 183 days.
A hard freeze (28°F) comes after April 21 in half of springs and before October 24 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Hales Corners in zone 5b in ZIP code 53130. By the map's own method, the average of each year's coldest night over 1991-2020, Hales Corners's NOAA station is in zone 5b: the coldest night of a typical year reaches −12°F (20 complete years).
Frost dates for every NOAA station in Wisconsin · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00473391; 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 Hales Corners?
In a normal year in Hales Corners, 12 days a year reach 90°F, 159 nights fall to 32°F or colder and 121 days bring measurable precipitation.
- 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
- 159a normal year
- Days that stay below freezing
- 51high of 32°F or less
- Days with 0.01 inch of precipitation
- 121a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00473391.
How sunny is Hales Corners?
Over a year 72% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Hales Corners, 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 Hales Corners need?
A normal year in Hales Corners brings 7,037 heating degree days, 31% more than the median U.S. place (5,373), and 608 cooling degree days, 33% 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 2,635 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,364 | 0 |
| February | 1,149 | 0 |
| March | 962 | 1 |
| April | 594 | 2 |
| May | 284 | 30 |
| June | 62 | 116 |
| July | 9 | 215 |
| August | 15 | 174 |
| September | 132 | 64 |
| October | 453 | 7 |
| November | 825 | 0 |
| December | 1,189 | 0 |
| Year (annual) | 7,037 | 608 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00473391. 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 Hales Corners been warmer than normal lately?
2022 averaged 46.5°F, 0.8°F below the 1991-2020 normal of 47.3°F.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2022 | 46.5°F | −0.8°F | 35.73 |
Source: observed years: ACIS, station USC00473391. A year counts only with all twelve months complete.
How does Hales Corners's climate compare?
Hales Corners is warmer than 146 of the other 164 places with their own NOAA record in Wisconsin, and wetter than 146. Across the 7,247 U.S. stations with normals, its annual mean of 47.3°F is warmer than 29%.
In the Köppen classification computed from these normals, Hales Corners 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 Hales Corners 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.
- New Berlin, WI40,302 people · 6 mi NW
- Greenfield, WI37,232 people · 2 mi NE
- Franklin, WI36,591 people · 4 mi S
- Muskego, WI25,759 people · 7 mi SW
- Greendale, WI14,455 people · 1 mi E
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 Hales Corners's climate
What is the coldest month in Hales Corners?
January, with a normal high of 30°F and a normal low of 12°F. The warmest is July (83°F by day, 61°F at night).
Does it snow in Hales Corners?
Yes. NOAA publishes no 1991-2020 snowfall normal for Hales Corners's NOAA station; the nearest record that keeps one, West Allis (6 miles away), records 52 inches of snow in a normal year.
What is the rainiest month in Hales Corners?
June, with 5.63 in of precipitation in a normal year; the driest is January with 1.80 in.
What plant hardiness zone is Hales Corners in?
The USDA's 2023 map puts Hales Corners in zone 5b in ZIP code 53130. By the same method at Hales Corners's NOAA station, the coldest night of a typical year reaches −12°F (20 years, 1991-2020): zone 5b.
How late can frost come in Hales Corners?
In half of years the last 32°F night comes after May 3; in one year in ten it comes after May 19. Waiting until May 19 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wisconsin climateThe statewide normals and every place in the state
- West Allis, WI6 miles from this station, 49.1°F a year
- Milwaukee, WI6 miles from this station, 49.3°F a year
- Wauwatosa, WI9 miles from this station, 48.2°F a year
- South Milwaukee, WI9 miles from this station, 48.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made