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

Delta, Colorado Weather

Monsoon storms drench the south. Day 15 of summer. Read this microseason across nine climate regions →

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

Delta, CO
Sunday, July 5 at 1:38 AM
67
°
Clear
Feels like
59°
Humidity
15%
Wind
7 mph
Sunrise
11:53 PM
Sunset
2:40 PM
Delta, CO
Hour by hour · 24h
24-Hour ForecastDelta, CO: 24-hour forecast. Temperatures range from 58 to 99 degrees Fahrenheit.
L 58°H 99°
Delta, CO
7-day forecast
  1. Today
    Jul 5
    Overcast
    —
    —
    99°58°—
  2. Monday
    Jul 6
    Light Drizzle
    13%
    —
    98°63°-1°
  3. Tuesday
    Jul 7
    Light Drizzle
    10%
    —
    99°61°+1°
  4. Wednesday
    Jul 8
    Overcast
    —
    —
    103°63°+4°
  5. Thursday
    Jul 9
    Light Drizzle
    —
    —
    100°62°-3°
  6. Friday
    Jul 10
    Mostly Clear
    —
    —
    103°60°+3°
  7. Saturday
    Jul 11
    Clear
    —
    —
    108°61°+5°
Delta, CO
Next 24 hours · Mild now
HOT 90°50°80°110°12a6a12p6pnow 66°high 99°low 58°
Delta, CO
Anemometer · 24h winds · from true
NESW
From · True
NE
052° · veering 15°
Direction
NE
052°
Sustained
7
mph
Gust
7
mph
Peak 24h
15
avg 5
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 5 · pk 15 @ 9:00p
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 175SUSTGUST
−24h−18h−12h−6hnow
A whisper of wind — leaves barely shift on the trees.
Delta, CO
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
847.3
-2.1 mb in 3h · falling rapidly · 25.02 inHg
Now
847.3
mb
3h
-2.1
mb
12h
-9.3
mb
24h
-0.3
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 847–856
840845850855860865-21h-18h-15h-12h-9h-6h-3h-24hNOW856.3846.8846.8
−24h−18h−12h−6hnow
Deep low still deepening — rough seas, strong wind, persistent rain.
Delta, CO
Air quality
79
AQI
Moderate
↓-23 in 6h

AQI 79 (Moderate), driven by PM2.5. AQI down 23 over the last 6 hours — air quality is improving sharply. PM2.5 at 9.6 µg/m³, PM10 at 12.0 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.

PM 2.5DRIVERGood
9.6μg/m³
PM 10Good
12μg/m³
NO₂Good
9μg/m³
OzoneModerate
86μg/m³
UV IndexLow
0.0

What's driving it

Ozone × UV × Sky

Ozone at AQI 41 now. With UV 3.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 18 around 1 PM.

Present
AQI 41
UV peak
3.3 at 1 PM
Sky at peak
clear
Projected peak
AQI 18

PM × Wind × Precip

PM2.5 at 9.6 µg/m³, PM10 at 12.0 µg/m³ — typical background levels with no transport signature.

PM2.5/PM10
0.80
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/m³500
Delta, CO
Sky cover · visibility · 24h
Cloud cover
0%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
44.0mi
UNLIMITED
185 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
07:38 UTC · Delta, CO · 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
07:38 UTC · Delta, CO · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Delta, CO
Satellite · infrared · animated
Delta, CO
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Delta, CO
Almanac · Sunday, July 5
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:22 AM
Sunrise
11:53 PM
Daylight
14h 47m
Sunset
2:40 PM
Civil dusk
9:13 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Delta, CO
The moon
Waning Gibbous
75% illuminated
Moonrise
11:31 PM
Moonset
11:28 AM
In sign
♓︎ Pisces
Delta, CO
Microseason
Jul 1–5

Monsoon storms drench the south

insect
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Delta at a glance

  • Today vs. normal: 6°F below the seasonal normal for this latitude
  • Last frost: April 9 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

ZIP code: 81416

15-Day Forecast — Delta

  1. Sun99°59°0%
  2. Mon98°63°13%
  3. Tue99°61°10%
  4. Wed103°63°5%
  5. Thu100°62°5%
  6. Fri103°60°1%
  7. Sat108°61°3%
  8. Sun108°62°10%
  9. Mon109°67°13%
  10. Tue111°66°13%
  11. Wed109°64°19%
  12. Thu109°64°39%
  13. Fri106°65°42%
  14. Sat108°64°42%
  15. Sun104°63°45%

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 — Delta

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

  • 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: Deep freeze grips the high peaks.January 6–10: Ice thickens on alpine tarns.January 11–15: Springs stir beneath locked earth.January 16–20: Grouse call from the transition zone.January 21–25: First signals of the soil's turning.January 26–31: Stream water crystallizes thick.February 1–5: The year's coldest fortnight begins.February 6–10: East wind carries a subtle promise.February 11–15: Snowmelt springs whisper beneath ice.February 16–20: Red-wing calls rise from the wetlands.February 21–25: Rain begins to trace the snowline upward.February 26–28: Mist gathers in the warming canyons.March 1–5: Grass and trees stir from their sleep.March 6–10: Hibernators break through frozen ground.March 11–15: First blooms open to the spring sun.March 16–20: Mountain bluebirds return to the summits.March 21–25: Spring equinox at the divide.March 26–31: Aspen catkins burst in clusters.April 1–5: Thunderstorms rumble over granite peaks.April 6–10: Swallows and swifts slice the warming sky.April 11–15: Sandhill cranes call through the wetlands.April 16–20: Rainbows arch over the snowfields.April 21–25: New growth explodes across the montane.April 26–30: Last frost yields to summer growth.May 1–5: Wildflowers crest the high meadows.May 6–10: Summer monsoon clouds gather southward.May 11–15: Snowmelt crests toward the divide.May 16–20: High country wildflowers peak.May 21–25: Summer heat accelerates the growing season.May 26–31: Summer settles into the high country.June 1–5: Pikas hayfeeding in granite peaks.June 6–10: Glacier lily carpets the snowmelt.June 11–15: Paintbrush crowns the ridges.June 16–20: Thunderheads build by noon.June 21–25: Long light holds the peaks.June 26–30: Monsoon moisture drifts north.July 1–5: Monsoon storms drench the south.July 6–10: Wind builds through canyons.July 11–15: Lightning crowns every peak.July 16–20: Elk herds claim alpine meadows.July 21–25: Pika caches reach their peak.July 26–31: Monsoon pulses weaken northward.August 1–5: Summer heat breaks with monsoon.August 6–10: First frost creeps to peaks.August 11–15: Cool wind returns from north.August 16–20: Monsoon clouds gather over the peaks.August 21–25: The monsoon breaks into scattered showers.August 26–31: Summer insects thin as autumn wind rises.September 1–5: Elk descend from summer high meadows.September 6–10: Dew crystallizes on high grass at dawn.September 11–15: Hawks begin the long crossing southward.September 16–20: Equinox: darkness claims the high passes.September 21–25: Thunder retreats as the monsoon dies.September 26–30: First frost hardens the high valleys.October 1–5: October: the aspen stands reach their peak.October 6–10: Aspen gold slides downslope with the chill.October 11–15: Snow settles on the high passes.October 16–20: Elk bugling fades as rut nears its end.October 21–25: First hard frost grips the basin.October 26–31: Late rains settle into November patterns.November 1–5: Aspen canopy falls to earth.November 6–10: Granite bones emerge from cover.November 11–15: Earth begins to harden.November 16–20: Bare ranges hold silence.November 21–25: Snow returns to the peaks.November 26–30: North wind strips the landscape.December 1–5: Deep darkness settles over the ranges.December 6–10: Winter locks the high country.December 11–15: Elk withdraw to winter range.December 16–20: Ice thickens across frozen water.December 21–25: Winter solstice — the sun returns.December 26–31: The year closes 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

Monsoon storms drench the south

Monsoon established in southern Mountain West (New Mexico, southern Utah, Arizona north); afternoon downpours and lightning common.

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

The year in Delta tops out in July (~72°F) and dips lowest in December (~28°F), with September wettest at 1.8 inches and June driest at 0.5 inches.

MonthMean tempPrecipRainy days
January28°1.1″4
February31°0.9″3
March40°0.8″3
April46°1.0″3
May56°1.2″4
June66°0.5″2
July72°1.0″4
August70°1.2″4
September62°1.8″5
October49°1.3″4
November38°0.5″2
December28°1.1″3

Regional context

In Delta, NOAA NCEI 1991-2020 normals put January near 28°F and July near 72°F — a 45°F seasonal arc — with about 12.5 inches of precipitation over 40 rainy or snowy days.

Rainfall in Delta stays even across the calendar: September tops out at 1.8 inches over 4.8 rainy days, and June still logs 0.5 inches across 1.9 — a narrow range for Delta. That lines Delta up with places like Orchard City, CO, Olathe, CO and Cedaredge, CO, fed by overlapping storm tracks.

Around mid-April, Delta sheds its freezing nights — kale, peas, spinach, and parsnips go into Delta's beds. Delta's heat-lovers — tomatoes, peppers, squash — hold off until Delta's frost risk clears, 10-14 days on. The season ends by mid-November in Delta, once hard frosts set back in. A creek-bottom lot in Delta can lag Delta's last frost 7-10 days behind a south slope.

Similar climates: Orchard City, CO, Olathe, CO, Cedaredge, CO, Lazear, CO, Hotchkiss, CO.

Frequently asked

When does it freeze in Delta?
In Delta, expect the last spring frost near mid-April; Delta's first autumn frost comes around mid-November.
What is the rainy season in Delta?
Delta sees its heaviest rain in September (around 1.8 inches), part of roughly 12 inches a year.
What is the warmest month in Delta?
July is Delta's warmest month, averaging about 72°F.
What is the coldest month in Delta?
Delta bottoms out in December, with a mean near 28°F.
When can I start a vegetable garden in Delta?
Delta's last frost (mid-April) cues hardy greens; in Delta, hold heat-lovers two weeks past.
How many rainy days does Delta get?
Expect roughly 40 wet days a year in Delta.
What hardiness zone is Delta?
Delta's USDA zone comes from its December mean (28°F); enter the ZIP on the USDA lookup for the number.
What is the 10-day forecast for Delta?
Delta'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 Delta?
See this week's day-by-day rain chances for Delta in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Delta?
Current conditions for Delta and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Delta forecast updated?
The Delta forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Delta?
Today's sunrise and sunset times for Delta 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 Delta?
The next few days in Delta's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Delta, Colorado occupies a hot desert zone, with January means near 28°F and July around 72°F — a 44°F swing.

Across the year, Delta collects about 12 inches of precipitation over roughly 40 days with measurable rain or snow.

The 44°F gap between Delta's summer and winter, at 38.8°N, shapes Delta's frost calendar.

All cities in Colorado →

Grand Junction, CO weather →

ZIP codes in Delta

  • 81416

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.