Weather StoryAlmanac, microseasons, and the day's weather story.

Jerome, Illinois Weather

Cicadas claim the scorching afternoon. Day 15 of summer. Read this microseason across nine climate regions →

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

Jerome, IL
Sunday, July 5 at 10:28 AM
77
°
Overcast
Feels like
83°
Humidity
83%
Wind
8 mph
Sunrise
12:36 AM
Sunset
3:29 PM
Jerome, IL
Hour by hour · 24h
24-Hour ForecastJerome, IL: 24-hour forecast. Temperatures range from 69 to 88 degrees Fahrenheit.
L 69°H 88°
Jerome, IL
7-day forecast
  1. Today
    Jul 5
    Foggy
    —
    —
    88°70°—
  2. Monday
    Jul 6
    Overcast
    —
    —
    86°69°-2°
  3. Tuesday
    Jul 7
    Overcast
    —
    —
    81°65°-5°
  4. Wednesday
    Jul 8
    Partly Cloudy
    —
    —
    84°64°+3°
  5. Thursday
    Jul 9
    Thunderstorm
    37%
    0.62″
    87°70°+3°
  6. Friday
    Jul 10
    T-storm w/ Hail
    45%
    0.04″
    81°70°-6°
  7. Saturday
    Jul 11
    Drizzle
    27%
    0.04″
    83°69°+2°
Jerome, IL
Next 24 hours · Mild now
HOT 90°64°78°92°6a12p6p12anow 77°high 88°low 69°
Jerome, IL
Anemometer · 24h winds · from true
NESW
From · True
N
351° · veering 141°
Direction
N
351°
Sustained
8
mph
Gust
13
mph
Peak 24h
20
avg 5
Beaufort · 3 · GENTLE 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 5 · pk 20 @ 3:00p
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 157SUSTGUST
−24h−18h−12h−6hnow
Light breeze veering 141° from the n.
Jerome, IL
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
992.2
+0.1 mb in 3h · steady · 29.30 inHg
Now
992.2
mb
3h
+0.1
mb
12h
+1.4
mb
24h
-1.7
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 990–994
9859909951000STORM|RAIN-21h-18h-15h-12h-9h-6h-3h-24hNOW993.8990.4992.1
−24h−18h−12h−6hnow
Deep low — expect rough seas, strong wind, and persistent rain.
Jerome, IL
Air quality
30
AQI
Good
→+4 in 6h▲Peak ~39 @ 9 PM

AQI 30 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±4 points). Ozone at AQI 37 now. With UV 4.4 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 22 around 1 PM.

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 2.5Good
4.7μg/m³
PM 10Good
6μg/m³
NO₂Good
3μg/m³
OzoneDRIVERModerate
78μg/m³
UV IndexModerate
3.1

What's driving it

Ozone × UV × Sky

Ozone at AQI 37 now. With UV 4.4 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 22 around 1 PM.

Present
AQI 37
UV peak
4.4 at 1 PM
Sky at peak
clear
Projected peak
AQI 22

PM × Wind × Precip

PM2.5 at 4.7 µg/m³, PM10 at 5.6 µg/m³ — typical background levels with no transport signature.

PM2.5/PM10
0.84
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 TREND50100SUNMONTUEWEDTHUFRISATSUN7-DAY PM2.5 TREND · μg/m³300
Jerome, IL
Sky cover · visibility · 24h
Cloud cover
86%
MOSTLY CLOUDY
100%0%−24h−18h−12h−6hnow
Visibility
34.9mi
UNLIMITED
57 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
15:28 UTC · Jerome, IL · 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
15:28 UTC · Jerome, IL · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Jerome, IL
Satellite · infrared · animated
Jerome, IL
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Jerome, IL
Almanac · Sunday, July 5
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:05 AM
Sunrise
12:36 AM
Daylight
14h 53m
Sunset
3:29 PM
Civil dusk
9:03 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Jerome, IL
The moon
Waning Gibbous
72% illuminated
Moonrise
11:16 PM
Moonset
11:11 AM
In sign
♓︎ Pisces
Jerome, IL
Microseason
Jul 1–5

Cicadas claim the scorching afternoon

plant
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Jerome at a glance

  • Today vs. normal: 5°F above the seasonal normal for this latitude
  • Last frost: April 15 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

16-Day Forecast — Jerome

  1. Sun88°70°7%
  2. Mon86°69°4%
  3. Tue81°65°1%
  4. Wed84°64°6%
  5. Thu87°70°37%
  6. Fri81°70°45%
  7. Sat83°69°27%
  8. Sun86°69°14%
  9. Mon89°70°8%
  10. Tue92°75°4%
  11. Wed81°63°5%
  12. Thu78°55°26%
  13. Fri82°62°25%
  14. Sat87°66°35%
  15. Sun87°73°42%
  16. Mon89°72°29%

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

Right now in the garden

Peak growing season

As of July 5, 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 — Jerome

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

  • TODAYTSTMGeneral Thunderstorms
  • TOMORROWNONENo severe risk
  • 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: Frost quiets the live oaks.January 6–10: Still water thickens with ice.January 11–15: Springs begin to move beneath ice.January 16–20: Cardinal dawn calls grow bolder.January 21–25: Late January thaw pulses.January 26–31: Last freeze locks the land.February 1–5: February's lengthening light.February 6–10: Warming winds thaw the margin.February 11–15: Magnolia blooms break the gray.February 16–20: Mockingbirds resume the dawn chorus.February 21–25: Rain replaces the last snow.February 26–28: Mist clings to greening valleys.March 1–5: The green pulse awakens.March 6–10: Hibernators emerge to call.March 11–15: Dogwood and redbud ignite.March 16–20: Swallowtails emerge from winter silk.March 21–25: Light crowns the dogwood canopy.March 26–31: Redbud cascades over the thaw.April 1–5: Thunder announces the wet season.April 6–10: Barn swallows carve the warming sky.April 11–15: Magnolia blooms and falls in a breath.April 16–20: First rainbows arch over thunderheads.April 21–25: Reeds push through marsh water.April 26–30: Frost retreats; seedlings rise free.May 1–5: Warblers flood the canopy in waves.May 6–10: Tulip poplar lights the forest crown.May 11–15: Shad pulse upstream through rapids.May 16–20: Roses open on the Piedmont edge.May 21–25: Fireflies scout the humid dusk.May 26–31: Frog choruses rise from every wetland.June 1–5: Fireflies pulse through the magnolias.June 6–10: Kudzu climbs deeper into green.June 11–15: Sun climbs to its northern throne.June 16–20: Heat settles and the rain begins.June 21–25: The longest day turns toward shadow.June 26–30: Fireflies drift through Spanish moss.July 1–5: Cicadas claim the scorching afternoon.July 6–10: Thunderheads boil and break at dusk.July 11–15: Thunder builds each drowsy afternoon.July 16–20: Cicadas claim the long noon.July 21–25: Dog days drape the earth in haze.July 26–31: Katydids begin their rasping chorus.August 1–5: Dusk arrives one minute earlier each night.August 6–10: Meteorological summer's turning page.August 11–15: Cool winds gather at the margins.August 16–20: Dog-day cicadas rise.August 21–25: Heat breaks in creek beds.August 26–31: Monarchs gather strength.September 1–5: Harvests begin in earnest.September 6–10: Dew beads on resurrection fern.September 11–15: Raptors trail the thermals.September 16–20: Day and dark find balance.September 21–25: Thunder quiets the land.September 26–30: Insects retreat below.October 1–5: Swamp waters recede.October 6–10: Maples ignite the ridge.October 11–15: Asters crown the meadows.October 16–20: Crickets sing at dusk.October 21–25: Frost paints the garden.October 26–31: Light rains whisper down.November 1–5: Sweetgum Turns Crimson.November 6–10: Camellia Blooms Break Through.November 11–15: Earth Stiffens Underfoot.November 16–20: Bare Limbs Hold the Light.November 21–25: First Frost Grips the High Ground.November 26–30: North Wind Strips the Last Leaves.December 1–5: Darkness Falls Before Dinner.December 6–10: Winter Locks the Land.December 11–15: Wildlife Retreats to Shelter.December 16–20: Ice Edges Deepen Inward.December 21–25: The Sun Begins its 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 scorching afternoon

Dog-day cicadas emerge in waves, their rasp dominating every sunny hour; heat peaks above 90 degrees daily.

Day 186 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——
Aprillettuce, peas, spinach, radishes—
Maylettuce, peas, spinach, radishes, tomatoes, peppers, beans, squashlettuce, peas, radishes
Junetomatoes, peppers, beans, squashlettuce, peas, radishes
Julytomatoes, peppers, beans, squashtomatoes, beans, summer squash
August—tomatoes, beans, summer squash
Septemberfall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
Octoberfall brassicas, garlic (overwinter), carrotswinter squash, tomatoes (last)
November——
December——

A year in weather

In Jerome, July runs warmest near 78°F and January coldest around 27°F, while May is the wettest month (4.5 inches) and January the driest (1.9 inches).

MonthMean tempPrecipRainy days
January27°1.9″14
February31°2.1″12
March42°3.4″16
April54°4.1″16
May64°4.5″17
June73°4.3″15
July78°2.9″14
August78°2.5″13
September71°2.9″12
October58°3.0″11
November43°3.4″12
December31°2.7″13

Frequently asked

When does it freeze in Jerome?
Frost typically leaves Jerome by mid-April and returns to Jerome near mid-November.
What is the rainy season in Jerome?
May is the wettest month in Jerome, about 4.5 inches on average; the year totals roughly 38 inches.
What is the warmest month in Jerome?
Jerome peaks in July, when the mean runs near 78°F.
What is the coldest month in Jerome?
January is Jerome's coldest month, averaging about 27°F.
When can I start a vegetable garden in Jerome?
Around mid-April, start frost-hardy crops in Jerome; tomatoes and basil belong a fortnight later.
How many rainy days does Jerome get?
Expect roughly 165 wet days a year in Jerome.
What hardiness zone is Jerome?
Because Jerome bottoms near 27°F in January, that winter low sets Jerome's USDA zone — verify by ZIP.
What is the 10-day forecast for Jerome?
Jerome'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 Jerome?
See this week's day-by-day rain chances for Jerome in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Jerome?
Current conditions for Jerome and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Jerome forecast updated?
The Jerome forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Jerome?
Today's sunrise and sunset times for Jerome 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 Jerome?
The next few days in Jerome's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Set in a humid subtropical zone, Jerome, Illinois swings from 27°F in the heart of winter to 78°F at midsummer — a 51°F arc.

Yearly precipitation in Jerome totals around 38 inches, spread over about 165 days of rain or snow.

Jerome's 51°F range, set by its 39.8°N position, drives frost timing and what thrives in Jerome.

All cities in Illinois →

Springfield, IL weather →

ZIP codes in Jerome

  • 62704

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.