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Greenfield, Wisconsin Weather

Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →

Greenfield weather forecast — hour by hour, 7-day outlook, NOAA radar

Greenfield, WI
Saturday, July 4 at 10:13 AM
78
°
Overcast
Feels like
83°
Humidity
80%
Wind
7 mph
Sunrise
12:18 AM
Sunset
3:34 PM
Greenfield, WI
Hour by hour · 24h
24-Hour ForecastGreenfield, WI: 24-hour forecast. Temperatures range from 62 to 79 degrees Fahrenheit.
L 62°H 79°
Greenfield, WI
7-day forecast
  1. Today
    Jul 4
    Light Rain
    43%
    0.10″
    79°64°—
  2. Sunday
    Jul 5
    Overcast
    10%
    —
    79°62°0°
  3. Monday
    Jul 6
    Overcast
    —
    —
    73°59°-6°
  4. Tuesday
    Jul 7
    Overcast
    —
    —
    78°58°+5°
  5. Wednesday
    Jul 8
    Overcast
    21%
    —
    81°60°+3°
  6. Thursday
    Jul 9
    Light Showers
    48%
    0.03″
    73°63°-8°
  7. Friday
    Jul 10
    Partly Cloudy
    34%
    —
    74°61°+1°
Greenfield, WI
Next 24 hours · Mild now
58°70°82°6a12p6p12anow 78°high 79°low 62°PRECIP %
Greenfield, WI
Anemometer · 24h winds · from true
NESW
From · True
NNW
338° · veering 97°
Direction
NNW
338°
Sustained
7
mph
Gust
12
mph
Peak 24h
14
avg 6
Beaufort · 2 · LIGHT BRZ
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
avg 6 · pk 14 @ 11:00a
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 188SUSTGUST
−24h−18h−12h−6hnow
Light breeze veering 97° from the nnw.
Greenfield, WI
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
985.4
+0.1 mb in 3h · steady · 29.10 inHg
Now
985.4
mb
3h
+0.1
mb
12h
-0.4
mb
24h
-3.0
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 985–988
9809859909951000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR10201025FAIR|DRY1030-21h-18h-15h-12h-9h-6h-3h-24hNOW988.4984.7985.4
−24h−18h−12h−6hnow
Deep low — expect rough seas, strong wind, and persistent rain.
Greenfield, WI
Air quality
37
AQI
Good
→0 in 6h▲Peak ~43 @ 9 PM

AQI 37 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 7.0 µg/m³, PM10 at 7.8 µg/m³ — typical background levels with no transport signature.

OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 9 PM.

PM 2.5DRIVERGood
7.0μg/m³
PM 10Good
8μg/m³
NO₂Good
8μg/m³
OzoneModerate
73μg/m³
UV IndexModerate
4.2

What's driving it

Ozone × UV × Sky

Ozone at AQI 34 now. With UV 5.9 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 19 around 1 PM.

Present
AQI 34
UV peak
5.9 at 1 PM
Sky at peak
partly cloudy
Projected peak
AQI 19

PM × Wind × Precip

PM2.5 at 7.0 µg/m³, PM10 at 7.8 µg/m³ — typical background levels with no transport signature.

PM2.5/PM10
0.90
Wind
light
Recent rain
0h in last 6h
Pattern
background

Trends

Seven days of AQI and PM2.5.

Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).

7-DAY AQI TREND50100SATSUNMONTUEWEDTHUFRISAT7-DAY PM2.5 TREND · μg/m³340
Greenfield, WI
Sky cover · visibility · 24h
Cloud cover
83%
MOSTLY CLOUDY
100%0%−24h−18h−12h−6hnow
Visibility
37.7mi
UNLIMITED
66 mi0 mi−24h−18h−12h−6hnow
Earth · GOES-19 ABI
Full Disk · Visible · GeoColor
GOES-19 full disk Visible · GeoColor
True-color daytime, blue/IR sandwich at night
15:13 UTC · Greenfield, WI · NOAA NESDIS / STAR · up to 10848 px
Continental US · GOES-19 ABI
CONUS Sector · Visible · GeoColor
GOES-19 CONUS Visible · GeoColor
Daytime true-color, blue-light/IR sandwich at night
15:13 UTC · Greenfield, WI · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Greenfield, WI
Satellite · infrared · animated
Greenfield, WI
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Greenfield, WI
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
4:44 AM
Sunrise
12:18 AM
Daylight
15h 16m
Sunset
3:34 PM
Civil dusk
9:10 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Greenfield, WI
The moon
Waning Gibbous
81% illuminated
Moonrise
10:51 PM
Moonset
9:54 AM
In sign
♓︎ Pisces
Greenfield, WI
Microseason
Jul 1–5

Cicadas claim the afternoon

plant
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Greenfield at a glance

  • Today vs. normal: 9°F above the seasonal normal for this latitude
  • Last frost: May 4 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

16-Day Forecast — Greenfield

  1. Sat79°64°43%
  2. Sun79°62°10%
  3. Mon73°59°1%
  4. Tue78°58°1%
  5. Wed81°60°21%
  6. Thu73°63°48%
  7. Fri74°61°34%
  8. Sat81°60°8%
  9. Sun65°59°10%
  10. Mon73°59°8%
  11. Tue75°61°8%
  12. Wed79°63°23%
  13. Thu83°66°14%
  14. Fri83°67°14%
  15. Sat81°67°23%
  16. Sun85°66°29%

Forecast data from Open-Meteo (CC BY 4.0).

Right now in the garden

Peak growing season

As of July 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.

SPC Convective Outlook

Storm Prediction Center — Greenfield

SPC includes Greenfield in the general thunderstorm area today — no severe risk, but storms are possible.

  • TODAYTSTMGeneral Thunderstorms
  • TOMORROWTSTMGeneral Thunderstorms
  • DAY 3NONENo severe risk

Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.

Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.

January 1–5: The year turns in silence.January 6–10: Ice thickens on still water.January 11–15: Shortest shadows lengthen.January 16–20: Pheasants begin to call.January 21–25: Springs begin to thaw.January 26–31: Chickadees announce dawn.February 1–5: East wind softens the frost.February 6–10: Sap begins to rise.February 11–15: First snowdrops appear.February 16–20: Red-winged blackbirds return.February 21–25: Rain begins to replace snow.February 26–28: Skunk cabbage pushes through ice.March 1–5: Ice withdraws from the reservoir.March 6–10: Crocuses open to weak sun.March 11–15: Peepers call from the marsh.March 16–20: Woodcocks spiral at dusk.March 21–25: Equinox — light overtakes dark.March 26–31: Forsythia opens along the fences.April 1–5: Cherry blossoms drift like snow.April 6–10: Warblers appear in the understory.April 11–15: Magnolias bloom and fall in a day.April 16–20: Dogwoods float above the forest.April 21–25: Lilacs perfume the evening.April 26–30: Last frost releases the garden.May 1–5: Warblers flood the Ramble.May 6–10: Tulip poplars light their candles.May 11–15: Shad run up the rivers.May 16–20: Roses open along the stoops.May 21–25: Firefly scouts appear at dusk.May 26–31: Strawberries ripen in the sun.June 1–5: Fireflies rise from the lawn.June 6–10: Elderflowers open in hedgerows.June 11–15: Solstice approaches — longest light.June 16–20: Honeysuckle sweetens the night.June 21–25: Solstice — the sun stands still.June 26–30: Lightning bugs drift through oaks.July 1–5: Cicadas claim the afternoon.July 6–10: Queen Anne's lace lines the roads.July 11–15: Thunder builds each afternoon.July 16–20: Corn reaches for the tassels.July 21–25: Dog days settle in the haze.July 26–31: Katydids begin their chorus.August 1–5: Night falls a minute earlier.August 6–10: Sunflowers face the morning.August 11–15: Goldenrod begins to bloom.August 16–20: Crickets pulse through warm nights.August 21–25: First cool morning surprises.August 26–31: Monarchs stage for flight.September 1–5: School buses reappear.September 6–10: Asters purple the roadsides.September 11–15: Hawk migration over the Hudson.September 16–20: Equinox — dark overtakes light.September 21–25: Apples hang heavy on the branch.September 26–30: Geese begin to chevron south.October 1–5: Witch hazel blooms as others fade.October 6–10: Maples begin to blaze.October 11–15: Frost paints the garden black.October 16–20: Oaks turn bronze and russet.October 21–25: Leaves rattle down the gutters.October 26–31: Clocks fall back — dusk at five.November 1–5: Ginkgos drop overnight.November 6–10: Last leaves cling stubbornly.November 11–15: Juncos arrive from the north.November 16–20: Bare branches reveal the sky.November 21–25: First flurries dust the rooftops.November 26–30: Woodsmoke curls through the block.December 1–5: Darkness settles before dinner.December 6–10: Holly and winterberry persist.December 11–15: Shortest day approaches.December 16–20: Ice begins to form at the edges.December 21–25: Solstice — the sun begins return.December 26–31: The year turns in silence.🌱February 14 — First skunk-cabbage spathes thaw their way up☀️March 20 — Spring equinox — day and night balance🌸April 5 — Cherry blossoms peak in the parks🐦May 10 — Warbler migration peaks along the coast✨May 25 — First fireflies scout the meadows at dusk🌞June 21 — Summer solstice — longest day🦗July 25 — Peak cicada chorus in the afternoons🌊August 18 — Warmest sea-surface temperatures of the year🍂September 22 — Autumn equinox — the slow turn❄️October 25 — First widespread frost in the suburbs🍁November 10 — Peak leaf color across the Hudson Valley🌙December 21 — Winter solstice — longest night

Microseason · July 1–5

Cicadas claim the afternoon

Annual cicada buzz begins, peaking in the heat of the day.

Day 185 of 365 · Wedge 37 of 72

The solar year drawn as a wheel of 72 five-day windows. Each wedge is one microseason; the four colored arcs mark winter, spring, summer, and autumn; the small icons sit at notable phenological events. The crimson pointer creeps clockwise as the year turns.

Planting calendar

MonthPlantHarvest
January——
February——
March——
April——
Maylettuce, peas, spinach, radisheslettuce, peas, radishes
Junelettuce, peas, spinach, radishes, tomatoes, peppers, beans, squashlettuce, peas, radishes
Julytomatoes, peppers, beans, squashtomatoes, beans, summer squash
Augusttomatoes, peppers, beans, squash, fall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
Septemberfall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
October—winter squash, tomatoes (last)
November——
December——

A year in weather

Greenfield's warmest month is August (~73°F mean) and its coldest is January (~23°F). Rainfall peaks in May (3.7 inches) and bottoms out in January (1.8 inches).

MonthMean tempPrecipRainy days
January23°1.8″18
February24°1.8″14
March32°2.6″16
April43°3.2″17
May52°3.7″18
June64°3.5″17
July73°2.6″15
August73°2.7″14
September67°3.1″14
October55°2.9″15
November40°3.1″15
December28°2.2″16

Regional context

Greenfield's climate, from NOAA NCEI 1991-2020 station normals, pairs 23°F Januarys with 73°F Julys — a 50°F swing. About 33.1 inches of precipitation falls over roughly 189 days a year.

Greenfield's precipitation spreads evenly: May peaks at 3.7 inches on 18.0 wet days, while January holds 1.8 inches over 17.8 — no month dominates Greenfield's rain calendar. It is a balanced pattern Greenfield shares with places like Greendale, WI, Hales Corners, WI and West Allis, WI.

By late-May the frosts ease in Greenfield, opening the season for kale, peas, spinach, and parsnips. Warm-soil crops in Greenfield wait about two weeks past Greenfield's last frost, once the soil warms. Around early-October, freezing nights resume in Greenfield and tender crops must come in. In Greenfield, low spots run 4-7°F colder than nearby slopes, nudging Greenfield's frost dates a week.

Similar climates: Greendale, WI, Hales Corners, WI, West Allis, WI, West Milwaukee, WI, Franklin, WI.

Frequently asked

When does it freeze in Greenfield?
Frost typically leaves Greenfield by mid-May and returns to Greenfield near mid-October.
What is the rainy season in Greenfield?
Greenfield sees its heaviest rain in May (around 3.7 inches), part of roughly 33 inches a year.
What is the warmest month in Greenfield?
On average August tops the year in Greenfield at about 73°F.
What is the coldest month in Greenfield?
The coldest stretch in Greenfield falls in January, around 23°F on average.
When can I start a vegetable garden in Greenfield?
Hardy spring crops go in near mid-May in Greenfield; tender peppers and squash wait 10–14 days.
How many rainy days does Greenfield get?
Greenfield records around 189 days of measurable precipitation annually.
What hardiness zone is Greenfield?
Because Greenfield bottoms near 23°F in January, that winter low sets Greenfield's USDA zone — verify by ZIP.
What is the 10-day forecast for Greenfield?
Greenfield's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
Will it rain this week in Greenfield?
See this week's day-by-day rain chances for Greenfield in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Greenfield?
Current conditions for Greenfield and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Greenfield forecast updated?
The Greenfield forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Greenfield?
Today's sunrise and sunset times for Greenfield are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
How accurate is the weather forecast for Greenfield?
The next few days in Greenfield's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

In Greenfield, Wisconsin, the warm-summer humid continental climate runs from about 23°F in January to 73°F in July, a 50°F seasonal range.

Greenfield sees close to 33 inches of precipitation annually, falling across some 189 wet days.

Greenfield's 50°F range, set by its 43.0°N position, drives frost timing and what thrives in Greenfield.

All cities in Wisconsin →

Milwaukee, WI weather →

ZIP codes in Greenfield

  • 53221
  • 53220
  • 53228

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.