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

Treynor, Iowa Weather

Toward the solstice glow. Day 88 of spring. Read this microseason across nine climate regions →

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

Treynor, IA
Monday, June 15 at 2:48 PM
76
°
Clear
Feels like
71°
Humidity
27%
Wind
12 mph
Sunrise
12:48 AM
Sunset
3:56 PM
Treynor, IA
Hour by hour · 24h
24-Hour ForecastTreynor, IA: 24-hour forecast. Temperatures range from 57 to 77 degrees Fahrenheit.
L 57°H 77°
Treynor, IA
7-day forecast
  1. Today
    Jun 15
    Partly Cloudy
    —
    —
    77°53°—
  2. Tuesday
    Jun 16
    Overcast
    —
    —
    78°57°+1°
  3. Wednesday
    Jun 17
    Overcast
    23%
    —
    86°63°+8°
  4. Thursday
    Jun 18
    Overcast
    —
    —
    72°57°-14°
  5. Friday
    Jun 19
    Overcast
    —
    —
    79°53°+7°
  6. Saturday
    Jun 20
    Drizzle
    52%
    0.01″
    73°60°-6°
  7. Sunday
    Jun 21
    Thunderstorm
    57%
    0.07″
    77°69°+4°
Treynor, IA
Next 24 hours · Mild now
52°67°82°12p6p12a6anow 75°high 77°low 57°
Treynor, IA
Anemometer · 24h winds · from true
NESW
From · True
WNW
302° · backing 28°
Direction
WNW
302°
Sustained
12
mph
Gust
16
mph
Peak 24h
17
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 17 @ 3:00p
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 207SUSTGUST
−24h−18h−12h−6hnow
Light breeze backing 28° from the wnw.
Treynor, IA
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
969.9
-1.3 mb in 3h · falling · 28.64 inHg
Now
969.9
mb
3h
-1.3
mb
12h
-2.6
mb
24h
-3.8
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 970–975
965970975980-21h-18h-15h-12h-9h-6h-3h-24hNOW974.6970.8970.8
−24h−18h−12h−6hnow
Deep low still deepening — rough seas, strong wind, persistent rain.
Treynor, IA
Air quality
32
AQI
Good
↓-10 in 6h▲Peak ~44 @ 11 PM

AQI 32 (Good), driven by Ozone. AQI down 10 over the last 6 hours (gradual decline). Ozone at AQI 53 now. With UV 8.1 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 57 around 1 PM.

OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.

PM 2.5Good
3.3μg/m³
PM 10Good
3μg/m³
NO₂Good
1μg/m³
OzoneDRIVERUnhealthy SG
109μg/m³
UV IndexVery high
8.1

What's driving it

Ozone × UV × Sky

Ozone at AQI 53 now. With UV 8.1 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 57 around 1 PM.

Present
AQI 53
UV peak
8.1 at 1 PM
Sky at peak
clear
Projected peak
AQI 57

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 TREND50100MONTUEWEDTHUFRISATSUNMON7-DAY PM2.5 TREND · μg/m³300
Treynor, IA
Sky cover · visibility · 24h
Cloud cover
0%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
133.1mi
UNLIMITED
130 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
19:48 UTC · Treynor, IA · 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
19:48 UTC · Treynor, IA · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Treynor, IA
Satellite · infrared · animated
Treynor, IA
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Treynor, IA
Almanac · Monday, June 15
A summer fog for fair, a winter fog for rain.
Civil dawn
5:16 AM
Sunrise
12:48 AM
Daylight
15h 08m
Sunset
3:56 PM
Civil dusk
9:32 PM
Planting note
Stake and prune tomato suckers. Watch for squash vine borers.
Treynor, IA
The moon
New Moon
1% illuminated
Moonrise
5:51 AM
Moonset
9:15 PM
In sign
♋︎ Cancer
Treynor, IA
Microseason
Jun 11–15

Toward the solstice glow

celestial
Jan 145% of the yearDec 31

Read this microseason across nine climate regions →

Treynor at a glance

  • Today vs. normal: 76°F — typical for the season
  • Last frost: April 23 (climatological average for this latitude)
  • Microseason: Jun 11–15
  • Planting window: Stake and prune tomato suckers. Watch for squash vine borers.

16-Day Forecast — Treynor

  1. Mon77°53°4%
  2. Tue78°57°4%
  3. Wed86°63°23%
  4. Thu72°57°5%
  5. Fri79°53°9%
  6. Sat73°60°52%
  7. Sun77°69°57%
  8. Mon77°62°26%
  9. Tue71°58°13%
  10. Wed76°62°17%
  11. Thu76°61°16%
  12. Fri79°62°25%
  13. Sat86°66°29%
  14. Sun74°59°29%
  15. Mon69°56°18%
  16. Tue75°53°29%

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

Right now in the garden

Peak growing season

As of June 15, 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 — Treynor

SPC has placed Treynor in the General Thunderstorms category for severe thunderstorms today.

  • TODAYTSTMGeneral Thunderstorms
  • TOMORROWTSTMGeneral Thunderstorms
  • DAY 3TSTMGeneral Thunderstorms

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: Winter settles deep on the plains.January 6–10: Arctic cold grips the heartland.January 11–15: Sunlight returns to the sloped terrain.January 16–20: Ring-necked pheasants call from cover.January 21–25: Deepest cold locks the prairie.January 26–31: Deep winter's pivot point.February 1–5: February's first breath.February 6–10: Subtle shifts in the light.February 11–15: Bald eagles concentrate on open water.February 16–20: Cold rebound before the final thaw.February 21–25: First killdeer return to thawed fields.February 26–28: Winter's veil grows thin.March 1–5: Ice withdraws from the land.March 6–10: Hibernators wake to open air.March 11–15: Spring arrives with fury and grace.March 16–20: Sandhill Cranes Rise from the Platte.March 21–25: Equinox — Night and Day Hold Balance.March 26–31: First Green Breaks Through Brown Earth.April 1–5: Thunder Voices Wake the Prairie.April 6–10: Cliff Swallows Return to Mud Nests.April 11–15: Wild Geese Wing North in Massive Flocks.April 16–20: Rainbows Follow Afternoon Storms.April 21–25: Prairie Sedges Push Through Wet Soil.April 26–30: Last Frost Retreats North.May 1–5: Wildflowers Erupt Across the Prairie.May 6–10: Grain Rains Feed the Growing Fields.May 11–15: Seedlings Rise From Frost-Free Soil.May 16–20: Roses Bloom Along the Shelter Rows.May 21–25: Summer Arrives Early in Wind and Heat.May 26–31: Frogs Begin Their Nightly Chorus.June 1–5: Prairie lightning bugs rise.June 6–10: Earthworms surface after rain.June 11–15: Toward the solstice glow.June 16–20: Lesser ripening, greater heat.June 21–25: Solstice—sun at zenith.June 26–30: Fireflies in the darkening oak.July 1–5: Cicadas claim the afternoon.July 6–10: Warm wind sweeps the tallgrass.July 11–15: Thunder builds every afternoon.July 16–20: Corn tassels and reaches peak.July 21–25: Dog days settle in haze.July 26–31: Katydid chorus erupts at dusk.August 1–5: Great rains sometimes fall.August 6–10: Autumn's edge approaches.August 11–15: Cool wind rises from the north.August 16–20: Late summer wind through tallgrass.August 21–25: Dew settles on the tallgrass.August 26–31: Monarchs gather on prairie.September 1–5: Corn tassels and heavy skies.September 6–10: Purple asters rise on the prairie.September 11–15: Hawks ride thermal currents south.September 16–20: Equinox brings balance to day.September 21–25: Thunder stills across the plains.September 26–30: Snow geese wheel through the flyway.October 1–5: Prairie enters dormancy slowly.October 6–10: Geese gather on autumn waters.October 11–15: First widespread freeze arrives.October 16–20: Oaks turn bronze and russet.October 21–25: Frost deepens through the night.October 26–31: Light rains fall on frozen ground.November 1–5: Tallgrass turns gold.November 6–10: North wind strips the oak.November 11–15: Frost locks the prairie.November 16–20: Open sky grows cold.November 21–25: First snow falls soft.November 26–30: Blizzard drives the herds.December 1–5: Deep winter takes hold.December 6–10: Sky closes cold, winter reigns.December 11–15: Darkness deepens, life retreats.December 16–20: Rivers turn to stone.December 21–25: Solstice — 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 · June 11–15

Toward the solstice glow

Days lengthen toward the summer solstice; corn and soybeans surge upward, reaching knee-height across the prairie heartland.

Day 166 of 365 · Wedge 33 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 Treynor, July runs warmest near 74°F and January coldest around 21°F, while May is the wettest month (5.4 inches) and January the driest (0.8 inches).

MonthMean tempPrecipRainy days
January21°0.8″2
February25°1.1″3
March38°2.0″4
April49°3.9″7
May61°5.4″9
June71°5.3″7
July74°3.6″6
August72°4.9″5
September65°3.6″5
October52°3.0″5
November38°1.6″3
December26°1.3″3

Regional context

By the nearest station's NOAA NCEI 1991-2020 normals, Treynor sees 21°F Januarys and 74°F Julys, a 54°F range, plus around 36.4 inches of precipitation across 59 days.

Treynor's rain peaks in summer: May brings 5.4 inches over 9.0 thunderstorm-fed days, while January sees just 0.8 inches across 2.3 days under cooler, drier air. It is a warm-season-wet pattern Treynor shares with places like Mineola, IA, McClelland, IA and Silver City, IA.

Treynor's growing window opens around mid-April, once Treynor's overnight lows stop freezing — sow kale, peas, spinach, and parsnips. In Treynor, warm-season transplants — tomatoes, peppers, basil — wait two weeks past Treynor's frost date. Around mid-November, freezing nights resume in Treynor and tender crops must come in. Within Treynor, cold-air pooling chills low spots by 5-10°F, shifting Treynor's local frost dates.

Similar climates: Mineola, IA, McClelland, IA, Silver City, IA, Carson, IA, Macedonia, IA.

Frequently asked

When does it freeze in Treynor?
Frost typically leaves Treynor by mid-April and returns to Treynor near mid-November.
What is the rainy season in Treynor?
Treynor sees its heaviest rain in May (around 5.4 inches), part of roughly 36 inches a year.
What is the warmest month in Treynor?
On average July tops the year in Treynor at about 74°F.
What is the coldest month in Treynor?
The coldest stretch in Treynor falls in January, around 21°F on average.
When can I start a vegetable garden in Treynor?
In Treynor, sow peas and hardy greens around mid-April; Treynor's tomatoes and peppers wait two weeks more.
How many rainy days does Treynor get?
Expect roughly 59 wet days a year in Treynor.
What hardiness zone is Treynor?
Since January in Treynor averages 21°F, Treynor's USDA zone follows that floor — confirm it by ZIP.
What is the 10-day forecast for Treynor?
Treynor'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 Treynor?
See this week's day-by-day rain chances for Treynor in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Treynor?
Current conditions for Treynor and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Treynor forecast updated?
The Treynor forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Treynor?
Day length in Treynor peaks around the June solstice — earliest sunrise and latest sunset — and is shortest near the December solstice.
How accurate is the weather forecast for Treynor?
The next few days in Treynor's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

The warm-summer humid continental climate of Treynor, Iowa carries typical Januarys near 21°F and Julys around 74°F — 53°F of seasonal travel.

Yearly precipitation in Treynor totals around 36 inches, spread over about 59 days of rain or snow.

From 41.2°N, Treynor sees a 53°F seasonal swing that governs Treynor's planting and frost windows.

All cities in Iowa →

Council Bluffs, IA weather →

ZIP codes in Treynor

  • 51575

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.